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Everything about Distributed-feedback laser

Type of laser diode

A distributed-feedback laser (DFB) is a type of laser diode, quantum-cascade laser or optical-fiber laser where the active region of the device contains a periodically structured element or diffraction grating. The structure builds a one-dimensional interference grating, and the grating provides optical feedback for the laser. This longitudinal diffraction grating has periodic changes in refractive index that cause reflection back into the cavity. The periodic change can be either in the real part of the refractive index or in the imaginary part. The strongest grating operates in the first order, where the periodicity is one-half wave, and the light is reflected backwards. DFB lasers tend to be much more stable than Fabry–Perot or DBR lasers and are used frequently when clean single-mode operation is needed, especially in high-speed fiber-optic telecommunications. Semiconductor DFB lasers in the lowest loss window of optical fibers at about 1.55 μm wavelength, amplified by erbium-doped fiber amplifiers (EDFAs), dominate the long-distance communication market, while DFB lasers in the lowest dispersion window at 1.3 μm are used at shorter distances. Wikipedia →

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  1. Read the overview: Distributed-feedback laserA 5-minute orientation
  2. Skim a recent paper: Sub-kHz-linewidth laser generation by self-injection locked distributed feedback fiber laserInfluential work since 2022
  3. Pick up a classic book: CW performance of an InGaAs-GaAs-AlGaAs laterally-coupled distributed feedback (LC-DFB) ridge laser diodeThe most-reprinted book on the subject
  4. Read the landmark paper: Random distributed feedback fibre laserCited 871 times
  5. Go sideways: Laser diodeA closely related topic
  6. Go sideways: Distributed Bragg reflectorA closely related topic

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