Showing that the optical parts will last in the field: laser ageing and wear-out, the stability of coupling and adhesives under temperature cycling, damp heat and mechanical shock, photodetector and modulator drift, the electronic die's own qualification to JEDEC practice, and for optoelectronic modules the generic reliability assurance practice the industry publishes, such as Telcordia GR-468.
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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