Detection method of transmission fiber connector loss in Raman fiber amplifier
A technology of splice loss and transmission fiber, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as incorrect calculation of splice loss, abnormal gain control, etc., and achieve the effect of no increase in cost and simple implementation method.
Active Publication Date: 2019-03-19
WUXI TACLINK OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
The above methods all need to modify and optimize the design of the RFA optical path. By adding optical devices to extract out-of-band spontaneous radiation to amplify the optical power, and then perform gain control and joint loss calculation. At present, the technology of this gain control method is not mature, and in the actual use environment There are too many limiting factors. For example, neither of the two patents mentioned the processing of the background noise of the transmission system. When the background noise ratio of the system is large, it will lead to abnormal gain control and incorrect calculation of joint loss.
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[0039] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0040] The schematic diagram of traditional FRA design is as follows: figure 1 As shown, including WDM (signal pump coupler), optical splitter, output monitor, pump laser (group), pump monitor. The conventional optical path structure of RFA is one of the most common optical structures in this professional field, and those in this professional field are familiar with it, so it will not be introduced in detail.
[0041] For a certain pump wavelength, the small-signal switching gain of the RFA can be expressed by Equation (1):
[0042]
[0043] Among them, g R is the fiber Raman gain coefficient; A eff is the effective area of the fiber; P p is the pump power into the fiber; k is the polarization factor; L eff is the effective length of the fiber, defined as L eff =1-exp(-α p L) / α p ; p is the attenuation coefficient of the pump light in the fiber; L...
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The invention provides a method for detecting transmission optical fiber splicing loss of a Raman fiber amplifier. According to the method, splicing losses ( Loss1 and Loss2) are defined, wherein Loss1=G(on / off)(theory)-G(on / off)(actual); Loss2=10*log[P(p)(actual) / P(p)(theory)]; Loss1 can reflect the change, compared with a standard transmission optical fiber in a factory state, of on-off gain of an actually used transmission optical fiber when the actual in-fiber pump total power P(p)(actual) is a certain value; and Loss2 can reflect the change, compared with the standard transmission optical fiber in a factory state, of in-fiber pump total power of the actually used transmission optical fiber when the on-off gain is a certain value. The method is identical with the conventional RFA optical design; impact of external factors can be ignored; no extra optical device is needed; and cost increase is avoided.
Description
technical field [0001] The invention relates to a Raman fiber amplifier (RFA: Raman Fiber Amplifier), in particular to a method for detecting the loss of a Raman fiber amplifier transmission fiber joint. Background technique [0002] RFA is designed based on the stimulated Raman scattering mechanism. Due to its low noise index, when used in conjunction with Erbium-doped fiber amplifiers, it can significantly improve the optical signal-to-noise ratio, reduce the bit error rate, and increase the transmission distance. Currently, RFA is widely used in In long-distance optical communication transmission system. Traditional RFA generally achieves gain control by calibrating the mathematical relationship between the target gain and the total power of the pump. [0003] In the engineering application of RFA, due to the insufficient cleanliness of the environment, the output end face of the amplifier is easily polluted or damaged, resulting in a large connection loss between the RF...
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IPC IPC(8): H04B10/291H04B10/079
CPCH04B10/0795H04B10/07955H04B10/2916
Inventor 王雷
Owner WUXI TACLINK OPTOELECTRONICS TECH CO LTD