The DFB laser, or Distributed Feedback Laser, is a single-frequency semiconductor laser that incorporates a built-in diffraction grating within its active region. This grating provides wavelength-selective feedback, enabling the laser to produce a narrow linewidth, high spectral purity, and stable output. These qualities make DFB lasers the preferred choice for high-speed, long-distance optical communication.
https://www.neoncq.com/high-sp....eed-dfb-dml-laser-se
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