The specification of the selected laser source and how it connects to the photonic circuit: wavelength, power, coupling method, isolation, thermal design, control and monitoring.
Specification Work product in the Silicon photonics and optical interconnect lifecycle
It fixes the laser interface that the circuit design, thermal design and packaging all depend on. When each team assumes a different power, wavelength or coupling loss, back reflection goes uncontrolled and the circuit design review is held against inconsistent inputs.
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