https://www.glsun.com/article-p112-fp-laser-vs-dfb-laser-dfb-laser-vs-dbr-laser.html
https://www.glsun.com/article-p112-fp-laser-vs-dfb-laser-dfb-laser-vs-dbr-laser.html
Difference Between FP Laser and DFB Laser, Difference Between DFB Laser and DBR Laser
A Fabry–Pérot laser diode (FP laser diode) is the most common type of laser diode, having a laser resonator which is a Fabry–Pérot interferometer. This means that substantial light reflections occur at both ends, but not within the gain medium.
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