Method for testing the additional noise power of erbium-doped fiber amplifier (EDFA) based on dual optical path polarization balance
An additional noise, erbium-doped fiber technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve the problem of lack of additional noise measurement methods, and achieve the effect of simple and easy test methods.
Active Publication Date: 2018-06-29
FUDAN UNIV
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Problems solved by technology
At present, the noise evaluation of erbium-doped fiber amplifiers is mainly based on the measurement of noise index for spontaneous emission, and there is a lack of direct measurement methods for additional noise
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[0031] The measuring system of embodiment adopts such as figure 2 shown. The light source is an SLD broadband light source, the FWDM is a 100G filter multiplexer with a wavelength range of 1551.595-1555.875nm, the EDFA is a single-mode erbium-doped fiber amplifier produced by OPEAK, and the polarization controller is a mechanical three-ring polarization controller. In addition, In order to reduce the impact of the reflected light from the fiber end face on the system, the connection of each passive component adopts FC / APC type. image 3 It is the variation curve of the additional noise factor with the pump current under different input optical powers. Figure 4 It is the variation curve of the additional noise factor with the input optical power under different pump currents.
[0032] [1]Zhou P, Peng H, Chen Y, et al.Independence between intensity and phase noise of superluminescent diodes in the low-frequency domain.[J].ApplOpt,2017,56(29):8275-8282.
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The invention belongs to the technical field of optical fiber sensing, and particularly relates to a method for testing the additional noise power of an erbium-doped fiber amplifier (EDFA) based on dual optical path polarization balance. The method is characterized in that a polarization controller and a polarization beam splitter are connected to an output end of the EDFA, the polarization controller is adjusted so that two paths of optical signals are balanced after passing through the polarization beam splitter, and signal lights and intensity noises of the signal lights are eliminated through signal processing based on polarization feature differences between amplified signal lights and spontaneous radiation lights, so that the additional noise power introduced by the EDFA is obtained,and effects of the EDFA on the signal-to-noise ratio of a distributed optical fiber sensing system are further studied. The testing method provided by the invention is simple and easy to implement, no additional modulation signals are needed, the system deterioration level caused by additional noises introduced by the EDFA can be precisely and completely measured, and great significance in the study and optimization of an ultra-long-haul distributed optical fiber sensing system is achieved.
Description
technical field [0001] The invention belongs to the technical field of optical fiber information, and in particular relates to a method for testing the additional noise power of an erbium-doped optical fiber amplifier (EDFA). Background technique [0002] Distributed optical fiber sensing is widely used in perimeter early warning, oil pipeline monitoring and other fields due to its advantages of long life, high sensitivity, high pressure resistance, good resistance to electromagnetic interference, and simple system. At present, the distributed optical fiber sensing system based on wavelength division multiplexing can realize 50km long-distance sensing without relay. However, due to the limitation of optical path loss, in order to realize ultra-long-distance optical fiber sensing, it is necessary to add an Erbium-doped fiber amplifier (EDFA) in the system as a repeater to amplify the signal light. The basic principle of the erbium-doped fiber amplifier is to use the stimulat...
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IPC IPC(8): H04B10/079
CPCH04B10/0795H04B10/0797
Inventor 肖倩贾波徐行
Owner FUDAN UNIV