Proving the link works in the system it was designed for: bit error rate and margin across temperature and supply, interoperability with other vendors' optics and with the electrical interfaces of the host, conformance to the applicable published specifications such as IEEE 802.3 optical PHYs, Optical Internetworking Forum agreements or a module multi-source agreement, module management, laser safety classification under IEC 60825, product compliance declarations, thermal behaviour in the real enclosure and customer qualification.
This stage with its neighbours. Each row is a discipline active here, shaded by how mature its work is by the end of each stage.
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