US 10924188

Here is a concise summary of US Patent 10,924,188.

Summary of US Patent 10,924,188

Title: Optical transmitter, optical communication system, and optical communication method

Assignee: Radiant Patents LLC

Inventors: Junichi Abe, Tatsuya Nakamura

Filing Date: May 12, 2020

Issue Date: February 16, 2021

Abstract:
To address the issue of increased power consumption and control complexity when modulation schemes in an optical communication system are switchable based on transmission conditions, this patent proposes an optical transmitter with a unique design. The transmitter includes an encoding unit that encodes digital signals using one of several encoding methods, depending on the transmission conditions. An encoding control unit selects the appropriate encoding method. A mapping unit then maps the encoded signals to modulation symbols, and an optical modulation unit modulates an optical carrier wave based on these symbols.

Plain-Language Overview of Independent Claims

US Patent 10,924,188 has two independent claims:

Claim 1: This claim describes an optical transceiver (a device that can both transmit and receive optical signals). The key feature is its ability to adapt to different "optical transmission attributes," such as the required data capacity, transmission distance, error rate, or signal-to-noise ratio. It achieves this by having an encoder that can use multiple different encoding methods. A controller within the transceiver identifies the best encoding method for the current conditions and sets up the device to use it. The encoded signals are then mapped to symbols and used to modulate an optical carrier wave for transmission.

Claim 9: This claim outlines an optical communication method that mirrors the functionality of the transceiver described in Claim 1. The method involves several steps:

• Encoding input digital signals using one of a plurality of available encoding methods.
• Identifying the appropriate encoding method based on the optical transmission attributes of the optical carrier wave.
• Setting the drive signals to modulate the optical carrier wave.
• Mapping the encoded digital signals to symbol signals.
• Modulating the optical carrier wave with these mapped signals for transmission.

Litigation

US Patent 10,924,188 is the subject of litigation. The current assignee, Radiant Patents LLC, has filed a lawsuit in the U.S. District Court for the Eastern District of Texas. The case is identified as Radiant Patents LLC v. Nokia Corporation et al., with the docket number 2:26-cv-00074, filed on January 26, 2026. This indicates that Radiant Patents LLC is actively enforcing this patent. At present, I do not have information regarding any proceedings before the Court of Appeals for the Federal Circuit (CAFC) for 2026 related to this specific patent.

Based on the information provided and a review of litigation records as of today's date, here is the known litigation involving US Patent 10,924,188.

Litigation Summary for US Patent 10,924,188

There is one known litigation case involving this patent.

• Plaintiff(s): Radiant Patents LLC
• Defendant(s): Nokia Corporation; Nokia of America Corporation
• Jurisdiction: U.S. District Court for the Eastern District of Texas
• Case Number: 2:26-cv-00074
• Filing Date: January 26, 2026
• Status: The case is currently active. Given the recent filing date, it is likely in the initial stages of litigation, such as pleadings and discovery. No outcome has been reached.

This case was previously identified and is confirmed by the provided litigation data. The action was initiated by the current assignee, Radiant Patents LLC, indicating an effort to enforce its patent rights.

Proceedings overview

There are no AIA trial proceedings on file with the USPTO Open Data Portal for US Patent 10,924,188 as of the most recent ingest. A web search for additional, unindexed proceedings also did not yield any results. This indicates that, to date, the patent has not been subjected to IPR, PGR, or CBM challenges before the Patent Trial and Appeal Board.

Recommended next steps

Since no PTAB activity currently exists for US Patent 10,924,188, a defendant facing assertion of this patent should be aware that all claims are currently presumed valid and have not been tested in an AIA trial. The absence of PTAB challenges for a patent involved in active litigation (as noted in the litigation summary) is a notable signal, suggesting that the patent owner has not yet faced a direct challenge to the validity of these claims at the PTAB. However, this also means that an IPR or PGR petition remains a viable defensive strategy for a new defendant, as there are no estoppel bars from prior PTAB proceedings.

Inventors

• Junichi Abe (NEC Corp)
• Tatsuya Nakamura (NEC Corp)

Both inventors were employed by NEC Corporation at the time of filing, the original assignee. No unusual patterns, such as all inventors departing within 12 months of filing, were observed.

Original assignee

The original assignee named on the issued patent is NEC Corporation.
NEC Corporation is a multinational information technology and electronics company that provides IT services, communication networks, and related products and solutions. As a major operating company in the optical communication sector, it is highly probable that NEC Corporation shipped products embodying the claims of this patent. NEC Corporation is currently operating.

Assignment timeline

• 2024-03-01 (executed) / recorded 2024-03-21 — Reel 060803/0369
  • Conveyance: Assignment
  • Assignor: NEC CORPORATION
  • Assignee: NEC ASIA PACIFIC PTE LTD.
  • Correspondent: KENJI MOTEGI; OBLON MCCLELLAND MAIER & NEUSTADT L.L.P.; 1940 DUKE STREET; ALEXANDRIA, VA 22314.
  • Context: Internal reorganization or regional transfer within the NEC corporate structure.
• 2024-09-03 (executed) / recorded 2024-10-03 — Reel 061214/0831
  • Conveyance: Assignment
  • Assignor: NEC ASIA PACIFIC PTE LTD.
  • Assignee: IP WAVE PTE. LTD.
  • Correspondent: GREGORY D. STEVENS; KILPATRICK TOWNSEND & STOCKTON LLP; 1114 AVENUE OF THE AMERICAS; NEW YORK, NY 10036. This correspondent recurs later in this chain.
  • Context: Transfer from an operating company subsidiary to a likely patent licensing entity.
• 2025-10-02 (executed) / recorded 2025-11-13 — Reel 062973/0187
  • Conveyance: Assignment
  • Assignor: IP WAVE PTE. LTD.
  • Assignee: PLS XLIV LLC
  • Correspondent: GREGORY D. STEVENS; KILPATRICK TOWNSEND & STOCKTON LLP; 1114 AVENUE OF THE AMERICAS; NEW YORK, NY 10036. This correspondent recurs in this chain.
  • Context: Transfer between shell entities.
• 2025-10-01 (executed) / recorded 2025-11-13 — Reel 062973/0200
  • Conveyance: Change of Name
  • Assignor: PLS XLIV LLC
  • Assignee: RADIANT PATENTS LLC
  • Correspondent: GREGORY D. STEVENS; KILPATRICK TOWNSEND & STOCKTON LLP; 1114 AVENUE OF THE AMERICAS; NEW YORK, NY 10036. This correspondent recurs in this chain.
  • Context: Name change of the patent owner to a known patent assertion entity.

Timeline diagram

timeline
    title Ownership of US 10924188
    2020 : Filed by NEC Corp
    2021 : Issued
    2024 : Assigned to NEC Asia Pacific
         : Assigned to IP Wave PTE LTD
    2025 : Assigned to PLS XLIV LLC
         : Name changed to Radiant Patents LLC
    2026 : First infringement suit filed

NPE / troll-pattern signals

1. Shell-entity transfer — Present. The patent was transferred to IP WAVE PTE. LTD. (Reel 061214/0831), which is recognized as a patent aggregator. Subsequently, it was transferred to PLS XLIV LLC (Reel 062973/0187), a generic LLC name, which then underwent a name change to Radiant Patents LLC (Reel 062973/0200), an entity with "Patents LLC" in its name, commonly indicative of a licensing-only operation.
2. Known asserter in the chain — Present. Radiant Patents LLC, the current assignee (Reel 062973/0200), is the plaintiff in active litigation involving this patent (Radiant Patents LLC v. Nokia Corporation et al., 2:26-cv-00074). IP WAVE PTE. LTD., a prior assignee (Reel 061214/0831), is also identified as a patent aggregator. [cite: unifiedpatents.com]
3. Repeat correspondent across the chain — Present. Gregory D. Stevens of Kilpatrick Townsend & Stockton LLP is listed as the correspondent for the assignments on Reels 061214/0831, 062973/0187, and 062973/0200. This recurrence across multiple transfers is a strong signal.
4. Cascading transfers — Present. The patent was transferred from NEC Asia Pacific to IP WAVE PTE. LTD. (recorded 2024-10-03), then from IP WAVE PTE. LTD. to PLS XLIV LLC (recorded 2025-11-13), and immediately followed by a name change to Radiant Patents LLC (recorded 2025-11-13). This sequence of transfers between shell entities occurred within approximately 13 months, with the final two steps recorded on the same day, indicating a rapid chain of ownership changes characteristic of NPE activity.
5. Pre-litigation transfer — Present. The assignment to PLS XLIV LLC (which immediately became Radiant Patents LLC) was recorded on November 13, 2025 (Reel 062973/0187 and 062973/0200). The first infringement suit for this patent was filed on January 26, 2026, which is approximately 2.5 months after the final recorded assignment, falling well within the 6-month pre-litigation window.
6. Bankruptcy fire-sale — Not present. The original assignee, NEC Corporation, is a large, operating company and there is no indication of bankruptcy proceedings.
7. Privateering — Present. The patent was originally owned by NEC Corporation, an operating company, and then transferred through a series of entities that ultimately lead to Radiant Patents LLC, a known NPE. This suggests NEC Corporation may have divested the patent to an NPE for enforcement, which aligns with the pattern of privateering.
8. Defensive aggregator (anti-NPE) — Not present. The chain terminates with Radiant Patents LLC, which is a patent assertion entity, not a defensive aggregator.

Verdict

NPE — high confidence

The patent exhibits multiple strong signals consistent with NPE assertion, including transfer from an operating company (NEC Corporation) to known shell entities (IP WAVE PTE. LTD., PLS XLIV LLC) which then became a known patent assertion entity (Radiant Patents LLC). These transfers occurred in a rapid, cascading fashion, with the final assignment taking place shortly before litigation was filed. The consistent use of the same correspondent across multiple transfers further reinforces this conclusion.

USPTO Patent Assignment Search for 10924188

Analysis of Prior Art for US Patent 10,924,188

The following analysis details the most relevant prior art cited against US Patent 10,924,188. This information is based on the patent's file wrapper and the citations listed in the issued patent.

Key Prior Art and Potential Anticipation of Claims

The primary innovation in US Patent 10,924,188 is the ability of an optical transceiver to dynamically select from a plurality of encoding methods based on the current "optical transmission attributes" (e.g., transmission distance, required capacity, error rate). A controller makes this selection to optimize the transmission.

Here are the most relevant prior art references and their potential impact on the claims of the '188 patent:

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1. US Patent 9,698,939 B2

• Full Citation: US Patent 9,698,939 B2, "Variable spectral efficiency optical modulation schemes," issued to Ciena Corporation.
• Filing Date: June 13, 2013
• Brief Description: This patent describes a method for adjusting the modulation format of an optical signal to vary its spectral efficiency. It discloses selecting a modulation format from a set of available formats (like QPSK, 8-QAM, 16-QAM) based on network conditions or performance requirements. This allows for a trade-off between data rate and transmission distance (reach).
• Potential Anticipation: This reference appears to be highly relevant to the core concepts of the '188 patent.
  • Claim 1 & 9: The '939 patent discloses an apparatus and method that selects a modulation format based on network parameters, which is analogous to selecting an "encoding method corresponding to optical transmission attributes" as claimed in the '188 patent. The act of choosing a modulation format inherently involves a specific encoding scheme. The motivation is also similar: to balance distance and capacity, as explicitly mentioned in the '188 patent's claims 5 and 13.

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2. US Patent Application Publication 2011/0293266 A1

• Full Citation: US Patent Application Publication 2011/0293266 A1, "Optical transmitting device and optical receiving device," assigned to Fujitsu Limited.
• Filing Date: May 28, 2010
• Brief Description: This application details an optical transmitter that can switch between different modulation schemes (e.g., DP-QPSK and DP-BPSK). This switching capability is designed to adapt to different transmission line conditions and requirements, allowing for flexible operation. The transmitter includes a modulation unit that can be configured to operate in these different modes.
• Potential Anticipation:
  • Claim 1 & 9: The '266 application describes a system with multiple, switchable modulation schemes, which directly corresponds to the "plurality of encoding methods" in the '188 patent. The selection of a scheme based on "transmission line conditions" is very similar to the '188 patent's "optical transmission attributes."
  • Claim 4 & 12: The explicit disclosure of "changing from one to another encoding method" is taught by the '266 application's description of switching between modulation schemes.

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3. US Patent Application Publication 2016/0043805 A1

• Full Citation: US Patent Application Publication 2016/0043805 A1, "Transmission of a data stream using enhancement layers of multiple hierarchically modulated optical waves," assigned to Alcatel-Lucent USA Inc.
• Filing Date: August 11, 2014
• Brief Description: This document describes a system that uses hierarchical modulation, where a base layer and one or more enhancement layers of data are transmitted. The modulation format can be varied to adjust the data rate. The system can adapt the transmission based on the quality of the optical channel.
• Potential Anticipation:
  • Claim 1 & 9: The '805 application's system of adapting the modulation based on channel quality aligns with the '188 patent's concept of selecting an encoding method based on transmission attributes. The use of different modulation formats to carry enhancement layers is a form of employing multiple encoding methods.
  • Claim 3 & 11: The idea of adapting to the "optical signal-to-noise ratio," a key transmission attribute, is central to the teachings of the '805 application, as channel quality is often measured by OSNR.

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In summary, several prior art references disclose the core concept of an optical transmitter that can switch between different modulation or encoding schemes to adapt to varying network conditions. US patents 9,698,939 B2 and US 2011/0293266 A1 appear to be particularly strong references, as they both describe selecting from a plurality of modulation formats to balance transmission distance and capacity, which is a central theme of the independent claims of US Patent 10,924,188.

Obviousness Analysis of US Patent 10,924,188 under 35 U.S.C. § 103

This analysis evaluates whether the claims of US Patent 10,924,188 would have been obvious to a person having ordinary skill in the art (POSITA) at the time of the invention, based on the previously identified prior art. The key inventive concept of the '188 patent is an optical transceiver that adapts to transmission conditions by selecting from a plurality of encoding methods.

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Combination 1: US 9,698,939 B2 in view of US 2011/0293266 A1

Argument for Obviousness: The combination of US Patent 9,698,939 B2 ('939 patent) and US Patent Application Publication 2011/0293266 A1 ('266 application) renders the claims of the '188 patent obvious. The '939 patent teaches the broader concept of a flexible, adaptive optical transmitter, while the '266 application provides specific, motivating details about the implementation of such a system.

• What the '939 Patent Discloses:
  The '939 patent forms the primary basis for this obviousness argument. It explicitly describes an optical communication system that selects a modulation format (e.g., QPSK, 8-QAM, 16-QAM) from a set of available formats to achieve a variable spectral efficiency. This selection is based on network conditions and performance requirements, with the express goal of trading off between data rate and transmission distance. This directly teaches the core elements of claims 1 and 9 of the '188 patent:

  • An encoder configured to use one of a "plurality of encoding methods" (as different modulation formats require different encoding).
  • A controller that "identify[s] an encoding method corresponding to optical transmission attributes" (such as transmission distance and capacity).
  • The overall structure of mapping signals and modulating an optical carrier wave.

• What the '266 Application Adds:
  The '266 application provides a concrete example and further motivation for implementing the system described in the '939 patent. It details an optical transmitter that switches between different modulation schemes (DP-QPSK and DP-BPSK) to adapt to "transmission line conditions." The '266 application explicitly teaches the circuitry and control mechanisms for "changing from one to another encoding method" (claims 4 and 12). A POSITA would look to the '266 application as a practical guide for implementing the flexible modulation system proposed by the '939 patent.

• Motivation to Combine:
  A person of ordinary skill in the art, when presented with the flexible, variable-efficiency system of the '939 patent, would be motivated to look for known methods to implement the switching between modulation formats. The '266 application provides a clear, well-understood example of how to build an optical transmitter with this exact capability. The motivation is to take the high-level, performance-driven concept from the '939 patent (balancing distance and capacity) and combine it with the practical implementation details from the '266 application to create a functional and efficient device. This combination would be a predictable and straightforward engineering step to achieve the desired result of an adaptive optical transceiver.

• Mapping to Claims:

  • Claims 1 and 9 (Independent): The '939 patent teaches selecting from multiple encoding/modulation schemes based on performance attributes. The '266 application reinforces this by showing a practical implementation.
  • Claims 3 and 11: The '939 patent's goal of balancing "transmission distance" and "capacity" directly teaches these limitations.
  • Claims 4 and 12: The '266 application explicitly teaches switching between modulation schemes, directly reading on the limitation of "changing from one to another encoding method."
  • Claims 5 and 13: The '939 patent's core teaching is to "balance optical transmission distance and capacity," making this limitation obvious.

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Combination 2: US 2011/0293266 A1 in view of US 2016/0043805 A1

Argument for Obviousness: This combination uses the '266 application as the primary reference, establishing the adaptable transmitter, and uses US 2016/0043805 A1 ('805 application) to add further detail about the specific transmission attributes used to control the adaptation.

• What the '266 Application Discloses:
  The '266 application serves as the base for this combination. It teaches an optical transmitter with the ability to switch between at least two distinct modulation schemes to adapt to "transmission line conditions." This disclosure provides the fundamental structure of the claimed invention: an encoder with multiple methods, a controller to switch between them, a mapper, and a modulator.

• What the '805 Application Adds:
  The '805 application teaches adapting a transmission based on the "quality of the optical channel," which is a more specific type of transmission attribute. A key measure of channel quality is the optical signal-to-noise ratio (OSNR). The '805 application's focus on adapting modulation based on channel quality would naturally lead a POSITA to consider specific, measurable parameters like OSNR as inputs for the control decision.

• Motivation to Combine:
  A POSITA starting with the adaptive transmitter of the '266 application would seek to refine the control mechanism. The '266 application mentions adapting to "transmission line conditions," which is a general concept. The '805 application provides motivation to make this control more precise by using specific, measurable channel quality metrics like OSNR. Combining these teachings would be a logical step to improve the performance and reliability of the adaptive system. The goal would be to move from a general adaptive concept to a system that intelligently responds to real-time, quantifiable network performance indicators.

• Mapping to Claims:

  • Claims 1 and 9 (Independent): The '266 application discloses the core components of the adaptive transceiver.
  • Claims 3 and 11: The '805 application teaches adapting based on channel quality, which would directly suggest using attributes like "optical signal-to-noise ratio" and the resulting "error rate" as the basis for selecting an encoding method.
  • Dependent Claims (2, 6, 7, 8, 10, 14, 15, 16): The specific details of differing code rates, multi-dimensional signals (phase, polarization), and amplitude correlations are common design choices in the field of advanced optical modulation. Once the fundamental idea of an adaptive, multi-format transmitter is established by the primary references, a POSITA would have considered these well-known techniques to optimize performance for different encoding schemes, making these claims obvious extensions of the primary combination.

Conclusion

The claims of US Patent 10,924,188 appear to be vulnerable to an obviousness challenge under 35 U.S.C. § 103. The core concept of an optical transmitter that selects from a plurality of encoding or modulation schemes to balance performance trade-offs like distance and capacity was well-established in the prior art. References such as the '939 patent and the '266 application describe this functionality in detail. A person of ordinary skill in the art would have been motivated to combine the teachings of these and other references to arrive at the claimed invention as a predictable solution to the known engineering problem of optimizing optical transmissions over varying conditions.

Analysis of Patent Term, Adjustments, and Family for US Patent 10,924,188

Based on a review of the USPTO database and related records for US Patent 10,924,188, here is a detailed analysis of its term, application history, and related patents.

Patent Term and Expiration

• Earliest Priority Date: The patent claims priority to an application filed on October 10, 2014 (Japanese Patent Application No. 2014-209346).
• Standard Term: A standard U.S. patent term is 20 years from the earliest non-provisional application's filing date in the U.S., which is part of the priority chain. The application leading to this patent (US16/872,491) was filed on May 12, 2020, but it is a continuation of earlier applications tracing back to an international application (PCT/JP2015/005059) filed on October 5, 2015.
• Patent Term Adjustment (PTA): There is no record of any Patent Term Adjustment (PTA) granted for this patent. PTA is typically awarded to compensate for delays caused by the USPTO during prosecution. Given the relatively swift prosecution of this continuation application, it is unsurprising that no PTA was accrued.
• Patent Term Extension (PTE): There is no record of any Patent Term Extension (PTE) for this patent. PTE under 35 U.S.C. § 156 is generally reserved for patents covering products that undergo a lengthy pre-market regulatory review, such as pharmaceuticals or medical devices, which is not applicable here.
• Projected Expiration Date: The anticipated expiration date for US Patent 10,924,188 is October 5, 2035. This is calculated by adding 20 years to the filing date of the international PCT application (October 5, 2015), from which it claims priority. This date is subject to the timely payment of all required maintenance fees.

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Application and Family Data

The application for US Patent 10,924,188 is part of a larger family of patents and applications, indicating a broad strategy to protect the underlying invention.

• Application Number: US 16/872,491
• Filing Date: May 12, 2020
• Issue Date: February 16, 2021

Continuity and Related Applications

This patent is a continuation of a prior application, which is a common practice to pursue different sets of claims based on the original disclosure.

• Parent Application:

  • This patent is a continuation of US Application No. 16/438,161 (now US Patent 10,693,560).

• Child Applications (Continuations):
  The invention of the '188 patent has been further prosecuted through several subsequent continuation applications, demonstrating its perceived value.

  • US Application No. 17/148,829 (now US Patent 11,476,943)
  • US Application No. 17/899,786 (now US Patent 12,009,865)
  • US Application No. 18/360,078 (now US Patent 12,126,385)

• Divisional Applications: No divisional applications have been identified for this patent.

Patent Family Members

The '188 patent is part of an extensive patent family, with applications filed to protect the technology in various jurisdictions. The key members of the patent family stemming from the original priority document include:

• US 10,361,789 B2
• US 10,693,560 B2
• US 11,476,943 B2
• US 12,009,865 B2
• US 12,126,385 B2
• WO 2016/056220 A1 (International Publication)

This chain of continuation applications and the resulting issued patents create a robust portfolio around the core technology, which is being actively asserted through litigation.

Defensive Disclosure: Adaptive Optical Transceiver Architectures and Methods

Publication Date: April 26, 2026
Subject Matter: Improvements and alternative embodiments for optical transceivers capable of dynamically selecting encoding methods based on transmission attributes, building upon the concepts disclosed in US 10,924,188. This document is intended to enter the public domain and serve as prior art for future patent applications in this field.

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Part 1: Derivative Variations based on Material & Component Substitution

1.1. Gallium Nitride (GaN) Based Modulator Drivers

• Enabling Description: The optical modulator is driven by an amplifier stage constructed with Gallium Nitride (GaN) High-Electron-Mobility Transistors (HEMTs). Unlike traditional silicon or gallium arsenide drivers, GaN drivers provide a higher breakdown voltage and support switching speeds in excess of 50 GHz. This enables the controller to set drive signals for high-order, complex modulation formats (e.g., 256-QAM) with greater signal integrity and lower power consumption. The controller adjusts the gate bias of the GaN HEMT array to optimize the linearity of the output signal for the selected encoding method, compensating for format-dependent amplitude and phase distortion.
• Diagram:

  flowchart TD
      A[Controller selects Encoding Method] --> B{Set Drive Signals};
      B --> C[Adjust GaN HEMT Gate Bias];
      C --> D[GaN Driver Amplifier];
      D --> E[Optical Modulator];
      F[Optical Carrier Wave] --> E;
      E --> G[Modulated Optical Signal];
  

1.2. Reconfigurable FPGA-Based Encoding Fabric

• Enabling Description: The encoder and controller are implemented on a Field-Programmable Gate Array (FPGA) rather than a fixed-function ASIC. The "plurality of encoding methods" are not stored as fixed circuits but as partial reconfiguration bitstreams. The controller, upon determining a change in transmission attributes (e.g., a drop in OSNR), loads a new bitstream into a specific region of the FPGA fabric. This dynamically reconfigures the hardware logic to implement a more robust encoding scheme (e.g., switching from a 16-QAM logic block to a QPSK logic block with Forward Error Correction). This architecture allows for post-deployment updates of encoding methods.
• Diagram:

  stateDiagram-v2
      state "16-QAM Mode" as Mode16
      state "QPSK Mode" as ModeQPSK
      state "8-QAM Mode" as Mode8
  
      [*] --> Mode16: Initialization
      Mode16 --> ModeQPSK: OSNR < 15dB, Controller loads QPSK bitstream
      ModeQPSK --> Mode16: OSNR > 18dB, Controller loads 16-QAM bitstream
      Mode16 --> Mode8: Capacity request change, Controller loads 8-QAM bitstream
      Mode8 --> Mode16: Capacity request change, Controller loads 16-QAM bitstream
      ModeQPSK --> Mode8: Link re-optimization
  

1.3. Monolithic Silicon Photonics (SiPh) Integration

• Enabling Description: The encoder, controller, mapper, and Mach-Zehnder optical modulator are fabricated on a single silicon die using a silicon photonics process. The controller logic is implemented in CMOS alongside the optical components. Electrical interconnects between the controller and the modulator's thermal or carrier-injection phase shifters are mere microns long, minimizing latency and parasitic capacitance. The controller directly drives the p-n junctions within the modulator's waveguides to achieve phase modulation corresponding to the selected symbol, enabling a highly compact and power-efficient transceiver.
• Diagram:

  graph TD
      subgraph Single Silicon Die
          direction LR
          A[CMOS Controller & Encoder] -- Electrical --> B(Mapper Logic);
          B -- Electrical --> C(Modulator Drivers);
          D[Laser Input] -- Waveguide --> E(Mach-Zehnder Modulator);
          C -- Electrical --> E;
      end
      E -- Waveguide --> F[Modulated Output];
  

1.4. Quantum Dot Laser Integration

• Enabling Description: The light source for the optical carrier wave is a quantum dot (QD) laser. The controller is coupled to the QD laser's driver circuit. When switching to a higher-order modulation format that is more sensitive to phase noise and power fluctuations, the controller simultaneously adjusts the QD laser's injection current and operating temperature via a Peltier element. This leverages the QD laser's high-temperature stability and low relative intensity noise (RIN) to provide a stable optical carrier optimized for the newly selected encoding scheme, thereby improving the overall signal-to-noise ratio.
• Diagram:

  sequenceDiagram
      participant C as Controller
      participant QD as QD Laser Driver
      participant M as Modulator
      C->>C: Detect need for encoding change (e.g., to 64-QAM)
      C->>QD: Set new injection current & temp for high stability
      QD-->>C: Acknowledge stable carrier wave
      C->>M: Set drive signals for 64-QAM
      M->>M: Modulate stable carrier wave
  

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Part 2: Derivative Variations based on Operational Parameter Expansion

2.1. Cryogenic Deep-Space Operation

• Enabling Description: For use in deep-space optical communication probes, the transceiver is designed to operate at cryogenic temperatures (4K to 77K). The controller and encoder are implemented on a radiation-hardened ASIC. The controller monitors an external radiation sensor. Upon detection of a solar particle event (SPE), it overrides the primary encoding method and switches to a failsafe differential phase-shift keying (DPSK) scheme with a high-gain, low-rate error correction code. This prioritizes link survival and data integrity over throughput in a high-radiation, low-temperature environment.
• Diagram:

  stateDiagram-v2
      state "High-Throughput (16-QAM)" as High
      state "Failsafe (DPSK)" as Safe
  
      [*] --> High: Nominal Conditions
      High --> Safe: Radiation > Threshold
      Safe --> High: Radiation < Threshold for 60s
  

2.2. Nanoscale On-Chip Optical Interconnects

• Enabling Description: The technology is scaled down for intra-chip communication within a multi-core processor. The controller is an embedded power management unit for a specific processor tile. It monitors the tile's temperature and processing queue length. If a core is under heavy load and generating thermal hotspots, the controller switches the optical I/O for that core from a power-intensive 16-PAM4 encoding to a lower-power 4-PAM4 or NRZ encoding. This throttles the I/O bandwidth to reduce local power density and prevent thermal runaway, optimizing chip-level performance.
• Diagram:

  flowchart TD
      A[Monitor Core Temperature & Queue] --> B{Temp > 85°C?};
      B -- Yes --> C[Switch Optical I/O to low-power NRZ encoding];
      B -- No --> D[Use high-bandwidth 16-PAM4 encoding];
      C --> A;
      D --> A;
  

2.3. Sub-Sea High-Pressure Communication

• Enabling Description: The transceiver is deployed in a sub-sea repeater housing at pressures exceeding 10,000 psi. The controller is linked to an external acoustic sensor monitoring water turbidity and a strain gauge on the optical fiber cable. In response to turbidity spikes or increased cable strain (indicating undersea currents or landslides), the controller proactively switches the encoding method to a lower-baud-rate, polarization-switched QPSK format. This format is highly resilient to the polarization-mode dispersion and signal scattering induced by such environmental events, preserving the link.
• Diagram:

  sequenceDiagram
      participant Sensor as Acoustic/Strain Sensor
      participant Controller as Transceiver Controller
      participant Encoder as Encoder Module
      loop Monitoring Loop
          Sensor->>Controller: Transmit Turbidity/Strain Data
          Controller->>Controller: Analyze data for anomalies
          alt Anomalies Detected
              Controller->>Encoder: Command switch to Polarization-Switched QPSK
          else Normal Conditions
              Controller->>Encoder: Maintain high-capacity 16-QAM
          end
      end
  

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Part 3: Derivative Variations based on Cross-Domain Application

3.1. Aerospace: Resilient Satellite Communication Bus

• Enabling Description: The transceiver acts as a node on an intra-satellite optical data bus connecting payloads (e.g., imagers, antennas, processors). The bus controller monitors the satellite's overall power state and the priority level of data from each payload. When the satellite enters an eclipse and operates on battery, the controller commands all non-essential payload transceivers to switch to a low-power On-Off Keying (OOK) encoding. The high-resolution imaging payload's transceiver is switched to a bandwidth-efficient but higher-power 8-QAM to transmit its critical data, thus creating a power-aware, prioritized internal network.
• Diagram:

  graph TD
      subgraph Satellite Bus
          A(Flight Computer) --> B(Bus Controller);
          B -- Command --> C(Transceiver 1 - Imager);
          B -- Command --> D(Transceiver 2 - Antenna);
          B -- Command --> E(Transceiver 3 - Housekeeping);
      end
  
      A -- "Power State: Battery" --> B;
      B -- "Set Imager: 8-QAM" --> C;
      B -- "Set Others: OOK" --> D;
      B -- "Set Others: OOK" --> E;
  

3.2. AgTech: Adaptive Free-Space Optics for Robotic Swarms

• Enabling Description: A swarm of autonomous agricultural robots uses free-space optical (FSO) transceivers for high-speed communication. Each robot's controller uses its onboard weather sensors (for fog/rain) and LiDAR (for dust/obstacles) to create a real-time atmospheric channel quality map. Based on this map, it negotiates an encoding method with neighboring robots. In clear conditions, it uses 16-QAM to share large field maps. When a dust cloud is detected, it renegotiates a switch to a more robust QPSK scheme with high-gain FEC to maintain the command-and-control link through the degraded channel.
• Diagram:

  sequenceDiagram
      participant RobotA as Robot A
      participant RobotB as Robot B
      RobotA->>RobotA: LiDAR detects dust cloud
      RobotA->>RobotB: Request Encoding Change to QPSK (Channel Degraded)
      RobotB->>RobotB: Verify channel degradation with own sensors
      RobotB->>RobotA: Acknowledge and Switch to QPSK
      RobotA->>RobotB: Resume communication using robust QPSK link
  

3.3. Medical Devices: Endoscopic Video Transmission

• Enabling Description: An optical fiber within an endoscope transmits high-resolution video from the tip's imager to a surgical display system. The transceiver's controller is linked to an inertial measurement unit (IMU) also at the endoscope's tip. When the IMU detects rapid motion (as the surgeon repositions the scope), the controller switches the video encoding to a low-latency, motion-adaptive format (e.g., Motion JPEG over optical). When the IMU is stable (as the surgeon examines tissue), the controller switches to a high-detail, higher-latency encoding scheme (e.g., HEVC over optical with high bit depth) to maximize diagnostic image quality.
• Diagram:

  stateDiagram-v2
      state "High Motion Mode" as Motion {
          Encoding: M-JPEG
          Priority: Low Latency
      }
      state "Static Diagnosis Mode" as Static {
          Encoding: HEVC (10-bit)
          Priority: Max Detail
      }
  
      [*] --> Static
      Static --> Motion: IMU detects high angular velocity
      Motion --> Static: IMU detects stability for >500ms
  

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Part 4: Derivative Variations based on Integration with Emerging Tech

4.1. AI-Driven Predictive Link Management

• Enabling Description: The controller integrates a lightweight AI inference engine (e.g., TensorFlow Lite) running a Long Short-Term Memory (LSTM) neural network. The LSTM is trained on historical link performance data (OSNR, BER, chromatic dispersion, latency) correlated with different encoding methods and environmental factors. The controller continuously feeds real-time performance metrics into the LSTM model, which predicts the probability of link degradation within a future time window (e.g., the next 5 minutes). If the probability exceeds a set threshold, the controller proactively switches to the AI-recommended optimal encoding method before any measurable performance degradation occurs.
• Diagram:

  flowchart TD
      A[Real-time Link Metrics (OSNR, BER)] --> B[LSTM Model];
      B --> C{Predict P(Degradation) > 75%?};
      C -- Yes --> D[Switch to AI-recommended optimal encoding];
      C -- No --> E[Maintain current encoding];
      D --> A;
      E --> A;
  

4.2. IoT-Enabled Network-Wide Optimization

• Enabling Description: Each transceiver is an IoT device with sensors for case temperature, laser bias current, and power consumption. It reports this telemetry via a lightweight protocol (like MQTT) to a centralized network management system (NMS). The NMS analyzes the aggregate data from all transceivers in the network. If it detects a trend of rising temperatures across a specific fiber path, it can infer a potential external issue (e.g., a conduit exposed to sun). The NMS then commands all transceivers on that path to switch to a more power-efficient encoding scheme to reduce thermal load and preemptively avoid failures.
• Diagram:

  graph TD
      subgraph NMS
          direction TB
          NMS_Core(Analytics Engine)
      end
      
      subgraph Transceivers
          T1(TRX-1) -- MQTT --> NMS_Core;
          T2(TRX-2) -- MQTT --> NMS_Core;
          T3(TRX-3) -- MQTT --> NMS_Core;
      end
  
      NMS_Core -- "Detects thermal trend on Path A (T1, T2)" --> T1;
      NMS_Core -- "Switch to low-power encoding" --> T2;
  

4.3. Blockchain-Secured SLA Enforcement

• Enabling Description: The transceiver controller includes a cryptographic module. When a service level agreement (SLA) demands a specific transmission capacity and error rate, the corresponding encoding method is selected. The transceiver periodically writes a block to a permissioned blockchain, containing a timestamp, the current encoding method, the measured BER, and a digital signature. A smart contract on the blockchain automatically verifies these reports against the SLA terms. If a violation is detected (e.g., the transceiver used a lower-capacity encoding method), the smart contract can trigger a penalty or alert, creating a tamper-proof, automated audit trail for network services.
• Diagram:

  sequenceDiagram
      participant TRX as Transceiver
      participant BC as Blockchain
      participant SC as Smart Contract
  
      loop SLA Monitoring
          TRX->>TRX: Measure BER and note current encoding
          TRX->>BC: Write signed data block (Timestamp, Encoding, BER)
          BC->>SC: Trigger SLA verification on new block
          SC->>SC: Compare block data with SLA terms
          alt Violation Detected
              SC->>BC: Log SLA violation event
          end
      end
  

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Part 5: Derivative Variations based on "Inverse" or Failure Modes

5.1. Graceful Degradation "Safe Mode"

• Enabling Description: The controller has a dedicated fault-detection circuit that monitors the health of critical components like the laser, modulator driver, and DSP. If a non-fatal but critical fault is detected (e.g., laser temperature exceeds a safety threshold), the controller forces the encoder into a pre-defined "safe" encoding state. This state uses a simple, low-power On-Off Keying (OOK) modulation at a very low baud rate. This maintains a minimal-bandwidth link capable of transmitting diagnostic information to the network manager, allowing for remote analysis before a complete failure.
• Diagram:

  stateDiagram-v2
      direction LR
      state "Full Operation" as Normal
      state "Safe Mode (OOK)" as Safe
  
      [*] --> Normal
      Normal --> Safe: Critical Fault Detected (e.g., Laser Overheat)
      Safe --> Normal: Remote Reset Command Received
      Safe --> [*]: Unrecoverable Fault / Shutdown
  

5.2. Fail-Passive Optical Bypass

• Enabling Description: The transceiver integrates a 2x2 optical switch at its input and output, controlled by a latching relay. In normal operation, the relay directs light through the transceiver's modulation and reception path. A "heartbeat" signal from the controller's processor maintains the relay in this state. If the controller fails or loses power, the heartbeat stops, and the relay automatically latches into its default state, which routes the input optical fiber directly to the output fiber. This optically bypasses the failed node entirely, ensuring the integrity of the larger ring or point-to-point network link.
• Diagram:

  graph TD
      subgraph Transceiver Node
          A[Fiber In] --> OS{Optical Switch};
          OS -- Path A (Active) --> TRX(Modulation/Reception);
          TRX --> OS;
          OS -- Path B (Bypass) --> B[Fiber Out];
          Controller -- Heartbeat --> OS;
      end
      
      style OS fill:#f9f,stroke:#333,stroke-width:2px
  

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Part 6: Combination Prior Art Scenarios with Open-Source Standards

6.1. Combination with SONiC (Software for Open Networking in the Cloud)

• Disclosure: An optical transceiver whose adaptive encoding capabilities are exposed and controlled via the SONiC management framework. The transceiver's driver provides an API accessible through the SONiC environment, allowing a network administrator or centralized controller to query available encoding modes (e.g., "100G-QPSK", "200G-16QAM") and their current performance metrics (BER, OSNR). The controller can issue commands via this API to switch the encoding method to re-balance network traffic or respond to link quality degradation as part of a global, software-defined network optimization strategy.

6.2. Combination with Telecom Infra Project (TIP) OpenConfig Models

• Disclosure: The adaptive optical transceiver is fully manageable using the OpenConfig data models for optical transport devices. The "plurality of encoding methods" are modeled as a list of available operational-mode leaves within a logical-channel in the OpenConfig YANG model. A network controller can set the target-output-power and select a specific operational-mode by writing to the corresponding leaves in the model. The transceiver's controller subscribes to changes in this model and reconfigures the encoder, mapper, and modulator accordingly. This ensures multi-vendor interoperability in a disaggregated optical network.

6.3. Combination with RISC-V Instruction Set Architecture

• Disclosure: The transceiver's controller is a System-on-Chip (SoC) based on the open-source RISC-V CPU architecture. The core encoding and mapping logic is not fixed hardware but is implemented as software running on the RISC-V core. Different encoding methods are simply different software libraries that can be loaded and executed. Furthermore, custom instructions are added to the RISC-V core using the standard's support for custom extensions, allowing for hardware acceleration of critical DSP functions like FEC or symbol mapping. This creates a flexible, open, and software-updatable platform for implementing adaptive optical modulation.