Obviousness

I am unable to perform a comprehensive obviousness analysis of US patent 10578818 under 35 U.S.C. § 103 as requested. My attempts to retrieve the content of the prior art references cited by the examiner (US7699641B2, US20110081114A1, US20140134898A1, US20150093083A1, US9720189B1, and US20170363828A1) using the provided search tools have yielded irrelevant patent documents (e.g., related to pharmaceutical compositions, CRISPR systems, or general search tools) rather than the specific disclosures of the cited prior art relevant to optical transceivers.

Without access to the actual content, claims, and figures of these cited prior art documents, it is not possible to:

1. Determine which elements of US10578818B1's independent claims (1, 10, and 11) are disclosed in each prior art reference.
2. Identify combinations of these references that would encompass all the limitations of the claims of US10578818B1.
3. Articulate a plausible motivation for a person having ordinary skill in the art to combine these references to arrive at the claimed invention, as required for an obviousness determination.

Therefore, I cannot provide an analysis of the obviousness of US patent 10578818 based on the "Prior Art" section at this time.