How a photonic product is shown to last: the qualification strategy and plan, laser ageing, coupling and adhesive stability under stress, the electronic die's qualification, failure analysis and the qualification report. Reliability, quality and packaging engineers and the program manager work from it.

1. Purpose and scope

Optical parts fail in ways electronics rarely do. Lasers wear out gradually, losing power or efficiency; adhesives and solder holding fibres can creep so coupling falls; moisture can affect some facets and coatings; and detectors and modulators can drift. Qualification must show these effects stay within the ageing allowance the link budget assumed, under the stresses the application expects.

Optoelectronic parts are commonly qualified to published industry practice such as Telcordia GR-468, alongside JEDEC practice for the electronic dies, and customers often add their own requirements. The stage begins when qualification units built on the production flow enter test and ends when the parts are reliability qualified and every failure is analysed.

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