Tunable multi-wavelength optical fibre laser with ultra-density wavelength interval based on semiconductor optical amplifier

Abstract

The invention discloses a tunable multi-wavelength optical fibre laser with ultra-density wavelength interval based on a semiconductor optical amplifier, belonging to the field of laser and optical communication. A gain medium in the laser is a semiconductor optical amplifier; a polarization controller is arranged at the input end of the semiconductor optical amplifier and used for regulating thepolarization state of the incidence light of the semiconductor optical amplifier; another polarization controller is arranged at the output end of the semiconductor optical amplifier and used for regulating the polarization state before light enters into the relative isolator for polarization. A birefraction optical fibre environment is formed by a 3dB coupler, the polarization controller and a polarization-preserving fibre to form a periodical filter. 90 percent of a port of a 10dB coupler is connected with a laser so that optical signals circulate continuously in a cavity, and 10 percent ofthe port is used for laser output. The nonlinear polarization rotation effect in the semiconductor optical amplifier is used for generating multi-wavelength laser with a wavelength interval less thanthe even broadened linear width of the semiconductor optical amplifier, and the polarization relevant gain property of the semiconductor optical amplifier is used for realizing tuning within a large-wavelength range of the multi-wavelength laser.

Description

technical field [0001] The invention relates to the field of laser and optical communication, and in particular provides a tunable multi-wavelength fiber laser with ultra-dense wavelength interval based on a semiconductor optical amplifier. Background technique [0002] With the development of large-capacity optical communication networks, wavelength division multiplexing (WDM) technology has been widely used. In recent years, multi-wavelength fiber lasers have not only become an important light source for wavelength division multiplexing systems, but are also widely used in the fields of optical sensing, optical sampling, optical measurement, and microwave photonics, which have attracted widespread attention at home and abroad. Erbium-doped fiber (EDF) can provide larger gain, higher saturation power and lower polarization-dependent gain spectrum, and is an ideal laser gain medium. However, Erbium-doped fiber is a uniformly broadened gain medium, and its uniformly broadene...

AI Technical Summary

Problems solved by technology

The fixed-wavelength filter makes the laser non-tunable, and the tuning range of fiber gratings and birefringent fiber loop mirrors is quite limited

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