Multi-wavelength Brillouin erbium-doped fiber laser with annular cavity based on Taiji structure

Abstract

The invention discloses a multi-wavelength Brillouin erbium-doped fiber laser with an annular cavity based on a Taiji structure, which comprises a pump light source (6) and an annular cavity with a Taiji structure, wherein the annular cavity with the Taiji structure comprises a first coupler (1), a first single mode fiber (3), a second single mode fiber (4), a third single mode fiber (5) and a second coupler (2). In the annular cavity with the Taiji structure of the invention, the first single mode fiber, the second single mode fiber and the third single mode fiber have bilaterally injected pump light simultaneously, thereby effectively reducing the threshold value for generating Stokes signals and further being favorable for generating high-order Stokes signals. The EDFA is arranged outside the annular cavity, thus link loss and ASE noise in the cavity are reduced, and the system is more compact and stable. A commercial EDFA can be used for well inhibiting a self-excited cavity die and has a flat gain spectrum, thus multiple wavelengths can be stably output in a very wide range only by changing the input wavelength of a tunable laser.

Description

Technical field [0001] The invention relates to a device in the technical field of optical fiber communication, in particular to a ring-cavity multi-wavelength Brillouin-doped erbium-doped fiber laser based on a Taiji structure. Background technique [0002] As people's demand for information increases day by day, more bandwidth is needed to transmit various data. Optical fiber communication has become the main means to meet this requirement with its incomparable advantages of high speed, wide bandwidth and low loss. Due to the influence of dispersion in optical fibers and the limitation of the speed bottleneck of electronic devices, increasing the speed of a single channel can no longer meet the requirements of transmission capacity, so people turn their attention to wavelength division multiplexing (WDM). The proposal and application of WDM has fully tapped the potential of optical fiber bandwidth, and is recognized as the most effective way to realize ultra-large capacit...

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Problems solved by technology

[0006] In view of the above shortcomings of the prior art, the purpose of the present invention is to overcome the deficiencies in the prior art, and propose a multi-wavelength, broadband tunable, stable wavelength, compact structure and lower cost Brillouin erbium-doped fiber laser, The scheme of the present invention is based on a new ring cavity structure, that is, a section of "S"-shaped single-mode optical fiber is used to connect a certain port on different sides of the two couplers in the ring cavity, and the pumping light and the generated Stokes The Stokes light transmits clockwise and counterclockwise in the ring cavity and can be circulated multiple times. We call this structure a Taiji structure ring cavity, which overcomes the problem of pumping light and Stokes light generated in the prior art. Defects in the ring cavity that can only circulate once in one direction and cannot be fully utilized to generate stimulated Brillouin scattering

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