Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier

A technology of stimulated Brillouin and Raman amplifiers, applied in the field of optoelectronics, can solve the problems of high process requirements, fiber damage, affecting the optical field, etc., and achieve high-power effects

Inactive Publication Date: 2010-08-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, for the method of reducing the overlapping degree of the light field and the sound field through a special design during drawing, the process requirements are high and the applicability is not strong
In addition, for the application of temperature field or stress field distribution, since a large temperature field or stress field distribution will cause damage to the optical fiber or affect the optical field, if a larger power output is required, its ability to suppress SBS is very limited
For narrow-linewidth FRA, there are no domestic and foreign literature reports on how to suppress SBS in detail, so the problem of suppressing SBS is the first problem that needs to be solved in narrow-linewidth FRA technology.

Method used

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  • Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier
  • Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier
  • Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier

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Embodiment

[0035] The FRA of the narrowband output of the MOPA structure of the present embodiment, such as Figure 5 As shown, it uses a distributed feedback semiconductor laser with a line width of 100KHz, a power of 15mW, and an output wavelength of 1178nm linearly polarized light as the seed source, and a fiber Raman laser with a line width of 4nm, an output wavelength of 1120nm, and a power of 80W passes through the coupler WDM1. A 50m long 1064nm single-mode fiber was pumped. The coupler WDM2 is used to output the unused 1120nm pump light, which can protect the 1178nm seed source. The parameters of the single-mode fiber are as follows: the core diameter is 6um, the cladding diameter is 125um, the peak gain coefficient g of SRS R =7*10 -14 m / W, peak gain g of SBS 0 =2.4*10 -11 m / W, SBS linewidth Ω sbs =58MHz, core refractive index n=1.45, effective section A eff =3.14*10 -10 m 2 .

[0036] When no SBS suppression method is used, the output power of the narrowband FRA is as ...

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Abstract

The invention relates to a stimulated Brillouin scattering (SBS) suppression method for a narrow band fiber Raman amplifier (FRA). By exerting negative temperature gradient and longitudinal pressure at the same time or exerting positive temperature gradient and longitudinal pressure at the same time, the method can effectively suppress stimulated Brillouin scattering in a high-power narrow band FRA, and the method has no high requirement to the equipment and is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, in particular to a method for suppressing stimulated Brillouin scattering in narrow-band optical fiber Raman amplifier technology. It is also suitable for high-power optical fiber parametric amplifiers, optical fiber parametric oscillators, and optical fiber amplifiers. Background technique [0002] The basic principle of Fiber Raman Amplifier (FRA) is to use the optical gain generated by Stimulated Raman Scattering (SRS) in the fiber to amplify the signal light. Silica fiber has a very wide stimulated Raman scattering gain spectrum. If a weak signal and a strong pump light wave are transmitted in the fiber at the same time, and the weak signal wavelength is placed within the Raman gain bandwidth of the pump light, the weak signal light will It can be amplified, and this kind of optical amplifier based on the fiber stimulated Raman scattering mechanism is called FRA. FRA has unique adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/102H01S3/30
Inventor 吴武明冷进勇许晓军舒柏宏姜宗福陈金宝郭少锋王泽锋吴慧云马浩统
Owner NAT UNIV OF DEFENSE TECH
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