The requirements on the laser source derived from the link budget: wavelength, output power, efficiency, linewidth, relative intensity noise, operating temperature, reliability and safety.
Requirements Work product in the Silicon photonics and optical interconnect lifecycle
It turns the link budget into what the laser must deliver, so candidate sources can be compared fairly. A trade study that compares lasers on whatever their data sheets happen to show overlooks end-of-life power, and the supplier agreement does not bind the supplier to what the product needs.
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