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High order Raman inhibition method based on polarization maintaining optical fiber 45-degree dislocation welding technology

A dislocation fusion splicing, polarization maintaining fiber technology, applied in the coupling of optical waveguides, optics, light guides, etc., can solve the problems of high insertion loss, complex preparation process, and applications that have not been publicly reported, and achieve low insertion loss, low cost, simple structure

Pending Publication Date: 2018-07-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The preparation process is complicated, and the insertion loss is relatively high, generally above 10%.
However, the application of these two methods in linearly polarized lasers has not been reported publicly

Method used

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  • High order Raman inhibition method based on polarization maintaining optical fiber 45-degree dislocation welding technology
  • High order Raman inhibition method based on polarization maintaining optical fiber 45-degree dislocation welding technology
  • High order Raman inhibition method based on polarization maintaining optical fiber 45-degree dislocation welding technology

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Embodiment Construction

[0024] figure 1 It is a structural schematic diagram of a specific embodiment of the present invention. In the linearly polarized Raman fiber laser, the Raman gain is relatively low when the pump wave and the Stokes wave are orthogonally polarized in the Raman gain spectrum. Through three sections of polarization-maintaining passive The two 45-degree dislocation fusion splices between the fibers realize the polarization rotation function with wavelength selection characteristics, so that the polarization directions of the pump light and the low-order Raman light remain unchanged, while the polarization direction of the high-order Raman light is orthogonal to the pump light. Thereby suppressing the gain of higher-order Raman.

[0025] refer to figure 1 A linearly polarized Raman fiber laser includes a linearly polarized pump source 1, a linearly polarized signal source 2, a polarization-maintaining passive fiber and a wavelength division multiplexer 5, and the polarization-mai...

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Abstract

The invention provides a high order Raman inhibition method based on a polarization maintaining optical fiber 45-degree dislocation welding technology. The method realizes a polarization rotation function through the characteristic that Raman gain is low when pump wave and Stokes wave in a Raman gain spectrum are subjected to cross polarization in an online polarized Raman fiber laser and the 45-degree dislocation welding of polarization maintaining passive optical fiber, so that the polarization directions of pump light and low order Raman light are not changed, and the polarization directionof high order Raman and the pump light are orthometric, and the high order Raman grain is inhibited.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and in particular relates to a high-order Raman suppression method. Background technique [0002] Raman fiber lasers based on fiber-optic stimulated Raman scattering are widely used in optical communication, supercontinuum generation, acquisition of special-band light sources, and medical treatment due to their wide gain spectrum and wavelength flexibility. In recent years, with the development of diode-pumped rare-earth ion-doped fiber lasers, the output power of Raman fiber lasers has increased significantly. Among them, linearly polarized Raman fiber lasers have important applications in the fields of frequency conversion and spectrum synthesis. [0003] The current maximum output power of linearly polarized Raman fiber lasers is only on the order of tens of watts, and further power improvement faces problems such as the generation of high-order Raman lasers. At present, there are two m...

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Application Information

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IPC IPC(8): H01S3/30H01S3/067G02B6/255
CPCH01S3/06712H01S3/302G02B6/255
Inventor 宋家鑫徐海洋叶俊张汉伟许将明马鹏飞肖虎冷进勇周朴刘泽金
Owner NAT UNIV OF DEFENSE TECH
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