Low noise tunable single frequency fiber laser for full-optical communication and its test system

Abstract

The invention publishes a low noise harmonious mono-frequent optical fiber laser which is used in the entire optical communication and its test system, aimed at solving the density change of the free current carrier in the source area of the semiconductor laser launch process, caused the twitter effect to cause the line-breadth phenomenon, could not satisfy the question that the high speed large capacity development request of the high speed wavelength division multiplying system and the optical communication. The laser contains the pump source, the optical coupler, the light isolator, the invariable light attentuator, the wavelength division multiplexer, the erbium ytterbium double mix optical fiber, the light circulator, the optical fiber polarizer, the er-doped optical fiber and the harmonious fiber grating. The test system is composed of the optical fiber laser, the light modulator, the actuation module, the error code analyzer, the light oscilloscope or the error code analyzer, the receive module and the light attentuator. The laser has mono-frequent, low noise, low twitter; the output is stable; suitable to use in the high speed long distance optical communication and take as the photo source in the optical fiber sensing; the test system may carry on the test analysis to laser's high speed electric light modulating characteristic.

Description

technical field [0001] The present invention relates to a laser emitting device and a performance testing device in the field of all-optical communication, and more specifically, relates to a low-noise tunable single-frequency fiber laser for all-optical communication and a test system thereof. Background technique [0002] In recent years, the research and application process in the field of optoelectronics has developed rapidly in the world. A variety of high-speed passive and active all-optical communication devices are emerging, such as high-speed optical modulators, fiber gratings and other products have been commercialized, the development of these devices has created very favorable conditions for this research. With the development of domestic pump source manufacturing technology and optical fiber manufacturing technology (such as material doping), especially the maturity of fiber grating practical technology, it has created a very favorable technology for the researc...

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Problems solved by technology

According to the latest literature and patent novelty searches, there has been no patent report on low-noise tunable single-frequency fiber lasers for all-optical communications

At present, the carrier light source in the optical fiber communication system usually adopts a distributed feedback (DFB) semiconductor laser, but its emission process is accompanied by the change of the concentration of free carriers in the active region, which leads to the broadening of the spectral line due to the chirp effect, which cannot meet the needs of high-speed waves. The development requirements of the division multiplexing system have become an important obstacle hindering the development of modern optical communication to high-speed and large-capacity

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