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What does FP mean in an optical module

A Fabry‑Perot (FP) laser is a common, cost‑efficient light source used within optical transceiver modules, particularly SFP modules. In this post, we'll explain how FP lasers work, their technical characteristics, and their typical applications, with reference to LINK‑PP's offerings on their. The FP laser FP (Fabry-perot) laser is a semiconductor light-emitting device that emits multi-longitudinal mode coherent light with a FP cavity as a resonant cavity. FP lasers are mainly used for low-rate short-distance transmission. Figure 1: Laser Classification 1.