Determination of Filter Spectrum Type of Passive Temperature Compensation Gain Flattening Filter
A gain-flat, temperature-compensated technology, used in instruments, nonlinear optics, optics, etc., to solve problems such as high power consumption
Active Publication Date: 2020-06-02
GUANGXUN SCI & TECH WUHAN
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Problems solved by technology
The disadvantage is that in the mechanical design of EDFA, a large space needs to be reserved for placing the heat preservation box, and the drive control circuit and temperature feedback are required in the circuit design and software design, and the power consumption is large when working at low temperature
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[0068] In order to make it easier for those skilled in the art to understand and implement the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0069] figure 1 It is an example of the relative gain variation at different temperatures when the built-in GFF sets the intrinsic gain of the optical amplifier to 25dB and there is no temperature compensation measure. The variation of the gain under the condition that the limit operating temperature is -5 (Celsius) degrees shows the variation trend of the gain of the optical amplifier. Temperature—the amount of gain change is related to the intrinsic gain of the optical amplifier. The larger the intrinsic gain, the greater the gain change caused by temperature changes. If the base temperature is set to T Base ,but figure 1 Example of T Base It is -5c (c means Celsius, the same below), and the gain change represented by the...
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The invention relates to a method for determining a filtering spectral pattern of a passive temperature-compensating GFF (gain flattening filter). A reference temperature gain flattening filtering spectral pattern is obtained by testing gains of a light amplifier at different temperatures, and an expected additional attenuation spectral pattern of a temperature compensator is determined according to gain difference of each temperature and reference temperature; according to properties of the temperature compensator, an actually reachable compensation spectral pattern of the temperature compensator and the filtering spectral pattern of the passive temperature-compensating GFF at different temperatures are determined with formulae; a target filtering spectral pattern of the passive temperature-compensating GFF can be obtained according to the reference temperature gain flattening filtering spectral pattern superposed with actually adjusted additional compensation spectrum of the temperature compensator. According to the method, theoretical basis and data basis are provided for actual application of the passive temperature-compensating GFF.
Description
technical field [0001] The invention belongs to an optical fiber communication system, and particularly relates to a method for determining the filter spectral shape of a passive temperature compensation gain flattening filter used in an erbium-doped optical fiber amplifier. Background technique [0002] In fiber optic communication systems, fiber amplifiers, especially erbium-doped fiber amplifiers (EDFAs), have become one of the core components of the system. The emergence and practical application of EDFA have greatly promoted the maturity and development of the wavelength division multiplexing system (WDM). After the erbium-doped fiber amplifier (EDFA) amplifies the signal, there is a gain difference between different wavelengths, that is, gain flatness, which will cause signal errors. With the increase of WDM system capacity and speed, the influence of EDFA gain flatness on system performance is becoming more and more obvious. [0003] There are two main methods to ac...
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IPC IPC(8): G02F1/39
CPCG02F1/39
Inventor 方迪乔立杰叶知隽罗旋
Owner GUANGXUN SCI & TECH WUHAN