Method for extracting characteristic parameters of multi-channel signal gain-polarization degree relation of nolinear fiber amplifier
A technology of nonlinear optical fiber and characteristic parameters, applied in nonlinear optics, instruments, optics, etc.
Active Publication Date: 2016-01-20
FUZHOU UNIV
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However, there is currently no method to analyze the polarization characteristics of broadband nonlinear fiber amplifiers and systems, and there is no parameter that can reflect the polarization control ability of broadband nonlinear fiber amplifiers for output signals of different wavelength channels.
In addition, compared with the experimental method of measuring the average gain-average degree of polarization relationship of fiber Raman amplifiers using a single-wavelength optical signal proposed in the relevant literature, there is currently a lack of general-purpose fast measurement of the gain-degree of polarization relationship for known nonlinear fiber amplifiers Methods
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[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0061] like figure 1 As shown, step S1 of this embodiment is connected by signal light source 001, multiplexer 002, polarization scrambler 003, pump light source 004, polarization controller 005, nonlinear fiber amplifier to be tested 006, photodetector 007, and optical fiber line composition.
[0062] In step S1, firstly, the signal light source 001 generates an optical signal 101, and the optical signal 101 passes through the multiplexer 002 and then is input into the polarization scrambler 003 to generate an optical signal 103, so that the output optical signal 103 has constant power and polarization per unit time. The characteristic of the state random distribution, which can also be characterized as the random and uniform distribution of the Stokes parameter of the optical signal 103 on the surface of the Poincare Sphere per unit time.
[0063] S...
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The invention relates to a method for extracting characteristic parameters of the multi-channel signal gain-polarization degree relation of a nolinear fiber amplifier. The method specifically includes the following steps that first, scrambled multi-channel optical signals are input to the nolinear fiber amplifier, and the polarization state is kept after the pump light polarization state is adjusted to obtain the maximum output gain; then pumping power is unchanged, and the output gain and the average polarization degree of each channel of the multi-channel optical signals are measured; afterwards, multi-channel gain-polarization degree relational data in a small signal gain region are detected after the pumping power is changed; at last, an obtained data set in the small signal gain region is fitted through a specific curve, hence, the characteristic parameters of the gain-polarization degree relation are extracted and the application wavelength range under different pumping conditions is determined. By the adoption of the method, the polarization control capacity to the multi-channel input signals by the nolinear fiber amplifier can be accurately reflected, and the method can be widely applied to polarization property analysis of a broadband nolinear fiber amplifier and system.
Description
technical field [0001] The invention relates to the field of measurement and characterization of the degree of polarization of the output signal of an optical fiber amplifier, in particular to a method for extracting characteristic parameters of the multi-channel signal gain-degree of polarization relationship of a nonlinear optical fiber amplifier. Background technique [0002] Nonlinear fiber amplifier refers to an all-optical amplifier that utilizes the nonlinear effect of light waves in optical fibers to amplify signals. Typical nonlinear fiber amplifiers include: Fiber Raman amplifier, Fiber optical parametric amplifier, Fiber Brillouin amplifier, Hybrid fiber amplifier, etc. A nonlinear optical fiber amplifier generally consists of an optical fiber, an optical pump, a polarization controller, and an optical splitter / circulator (circulator), and can amplify an input single-wavelength channel or multi-wavelength channel optical signal. [0003] Nonlinear fiber amplifier...
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IPC IPC(8): G02F1/39G02F1/365
CPCG02F1/365G02F1/395
Inventor 王少昊卫炳江
Owner FUZHOU UNIV