Prior art

IV. Prior Art Analysis for US 11,431,431

This section evaluates the prior art references cited by the USPTO examiner during the prosecution of US Patent 11,431,431. The analysis focuses on the potential for these references to anticipate the patent's claims under 35 U.S.C. § 102. A claim is anticipated if every element of that claim is found in a single prior art reference. The independent claims (1, 4, 7) are the primary focus, as the invalidity of an independent claim typically renders its dependent claims invalid as well.

The core invention of US 11,431,431 is an optical communication apparatus (and corresponding system and method) that includes:

1. A demultiplexer to split a wavelength multiplexed signal.
2. An attenuator to adjust the power of a demultiplexed optical signal.
3. A controller that receives "connection information" about a "connected target" (i.e., the type of device connected to an output port).
4. The controller then sends a specific attenuation amount to the attenuator based on the type of device connected (e.g., a different amount for a "first optical device" vs. a "second optical device").

The following analysis examines the most relevant examiner-cited prior art in view of these core elements.

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Key Prior Art References

1. US Patent No. 6,959,149 B2 ("Nortel '149")

• Full Citation: US 6,959,149 B2, "Power balancing in DWDM optical networks," assigned to Nortel Networks Limited.
• Dates: Filed March 29, 2002; Published October 25, 2005.
• Brief Description: The Nortel '149 patent describes a method for power balancing in a dense wavelength division multiplexing (DWDM) optical network. It discloses a reconfigurable optical add-drop multiplexer (OADM) that includes variable optical attenuators (VOAs). A control system adjusts these attenuators to equalize the power levels of different wavelength channels. The system can adjust power levels based on factors like the number of active channels and the desired optical signal-to-noise ratio (OSNR).
• Potential Anticipation Analysis:
  • Claim 1 & 7: The Nortel '149 patent discloses a demultiplexer, an attenuator, and a controller that adjusts the attenuation amount. However, it does not appear to explicitly disclose receiving "connection information on a connected target" and then selecting an attenuation amount based on whether the target is a "first optical device" or a "second optical device." The adjustments in Nortel are based on internal network characteristics (like OSNR or channel count) rather than the identity or type of the external device connected to the output port. Therefore, Nortel '149 likely does not anticipate claims 1 and 7 as it is missing the key limitation of adjusting attenuation based on the type of connected device.
  • Claim 4: Since the base apparatus is not fully disclosed, the system claim also is not anticipated.

2. US Patent No. 7,257,288 B1 ("Nistica '288")

• Full Citation: US 7,257,288 B1, "Tunable optical routing systems," assigned to Nistica, Inc.
• Dates: Filed April 23, 2004; Published August 14, 2007.
• Brief Description: The Nistica '288 patent details a tunable optical routing system, such as a ROADM, that can route WDM signals. The system includes wavelength-selective switches (WSS) and arrays of variable optical attenuators (VOAs). A controller manages the VOAs to adjust the power of optical signals as they are routed through the system to different output ports.
• Potential Anticipation Analysis:
  • Claim 1 & 7: Similar to Nortel '149, the Nistica '288 patent teaches the use of a controller to manage variable attenuators for power balancing within an optical node. It describes routing different wavelengths to different ports and adjusting their power. However, the control logic described is for managing signal integrity within the network (e.g., equalization). The patent does not explicitly describe a controller that receives information identifying the type of external device connected to an output port and then sets the attenuation level based on that specific device's requirements (e.g., setting one attenuation level for a cross-connect and a different level for a client-side transponder). This critical element of the claims in US 11,431,431 appears to be absent.
  • Claim 4: The system claim is not anticipated for the same reasons.

3. US Patent Application Publication No. 2009/0297149 A1 ("Fujitsu '149")

• Full Citation: US 2009/0297149 A1, "Optical add/drop multiplexer," assigned to Fujitsu Limited.
• Dates: Filed May 28, 2008; Published December 3, 2009.
• Brief Description: The Fujitsu '149 publication describes an OADM with a wavelength selective switch (WSS) that includes a variable attenuator. It aims to suppress signal degradation by controlling the optical power of signals being added, dropped, or passed through. A control unit sets the attenuation loss of the variable attenuator.
• Potential Anticipation Analysis:
  • Claim 1 & 7: Fujitsu '149 discloses all the basic hardware components: a demultiplexer (within the WSS), an attenuator, and a controller. The controller's function is to maintain optimal power levels for network performance. However, like the other references, the crucial step of receiving "connection information on a connected target" and choosing an attenuation amount specifically based on the type of that target device (first vs. second device type) is not explicitly taught. The control is based on internal power monitoring and pre-set levels for network operation, not on adapting to different categories of external equipment.
  • Claim 4: The system claim is not anticipated for the same reasons.

4. US Patent Application Publication No. 2013/0315580 A1 ("Ciena '580")

• Full Citation: US 2013/0315580 A1, "Software defined networking photonic routing systems and methods," assigned to Ciena Corporation.
• Dates: Filed February 13, 2012; Published November 28, 2013.
• Brief Description: The Ciena '580 publication describes a software-defined networking (SDN) approach to controlling optical networks. It discloses a centralized controller that manages network elements like ROADMs. The controller can configure paths and set parameters, including power levels, on various components. This reference explicitly mentions controlling components based on the requirements of a connection.
• Potential Anticipation Analysis:
  • Claim 1, 4, & 7: Ciena '580 comes closer to the claimed invention by disclosing a centralized network management or SDN controller (as in claim 4) that sends instructions to an optical apparatus. The controller sets parameters for a connection. It is plausible that setting up a connection to a specific device would involve setting appropriate power levels for that device. However, the reference may not explicitly state the specific logic claimed: receiving "connection information" that identifies a "connected target" as a "first optical device" versus a "second optical device," and sending a corresponding attenuation amount based on that classification. While an SDN controller could be programmed to do this, the anticipation standard under § 102 requires the reference to explicitly or inherently disclose this feature. A defense for US 11,431,431 would argue that Ciena '580 teaches generalized SDN control without disclosing the specific claimed logic for adaptive attenuation based on device type.

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Summary of Analysis

The prior art cited by the examiner describes the fundamental building blocks of the claimed invention, including optical add/drop multiplexers, wavelength selective switches, variable optical attenuators, and controllers for power management. However, none of the reviewed references appear to explicitly disclose the key inventive concept of US 11,431,431: a controller that receives information identifying the type of device connected to an output and then adaptively sets a specific attenuation amount from a set of pre-determined amounts corresponding to different device types.

The prior art generally teaches power balancing for internal network reasons (e.g., OSNR, equalization) rather than for compatibility with different categories of external devices. While the Ciena '580 reference discusses high-level SDN control for setting up connections, it may lack the specific, granular detail required to anticipate the claims. Therefore, a strong argument can be made that the claims of US 11,431,431 are novel over these references.