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Direfraction filter spectrum gain equalizer and its manufacturing method

A technology of gain equalizer and manufacturing method, which is applied in the direction of instruments, optics, optical components, etc., can solve problems such as poor performance, and achieve the effect of simple structure and simple calculation method

Inactive Publication Date: 2005-06-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This filter is well balanced for a single EDFA, but it is not well balanced for the gain spectrum formed by multiple EDFAs connected in series in the fiber optic system. It can only achieve a flat gain of 0.7dB, and an additional amplifier compensation equalizer is required. peak loss caused by

Method used

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  • Direfraction filter spectrum gain equalizer and its manufacturing method
  • Direfraction filter spectrum gain equalizer and its manufacturing method
  • Direfraction filter spectrum gain equalizer and its manufacturing method

Examples

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Embodiment 1

[0090] The spectral gain equalization waveform required for gain flattening of the erbium-doped fiber amplifier is as follows: Figure 5 As shown by the thick black line 1, the wavelength range is 1550nm--1562nm, and the shape of this line is asymmetrical. Firstly, extend the line shape to 1549nm--1568nm. During the extension process, try to make the left and right symmetrical, because this spectral gain equalizer is only periodic in the frequency domain, so the waveform is transformed into the frequency domain for analysis. In this example The frequency range is 1.913043×10 14 Hz---1.936955×10 14 Hz, Δω=1.502435×10 13 radian. Then with 1.936955×10 14 Hz is the symmetry point, and the symmetry extends to 1.960867×10 14 Hz, at this time Δω'=3.00487×10 13 radian. Then take Δω′ as the period to extend the waveform infinitely left and right on the ω axis. At this time, the line shape can be Fourier expanded into a cosine series for ω, because T in the expansion 4 The subs...

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Abstract

A bireflection filtering spectrum equalizer and its manufacturing method are disclosed. The structure of equalizer is that along the light passing are input optical fiber, the first gradient refractive index lens, the first beam splitter, phase delayer , the second beam phase the second gradient refractive index lens and output optical fiber. The manufacturing method includes the following steps: width of the thinnest crystal plate is concluded in accordance with the wave shape frequency range of filtering needed; the width and assembling angle of each crystal plate is calculates, in accordance with which each crystal plate is installed to become a birefringence filtering spectrum equalizer. The advantages are simple structure and good effect of filtering.

Description

technical field [0001] The invention relates to a spectral gain equalizer, in particular to a birefringence filter-type spectral gain equalizer and a manufacturing method thereof. The gain equalizer is mainly used for spectral gain equalization of various doped optical fiber amplifiers, and spectral gain Equalization, can also be used as a spectral filter with a specific filter waveform function. Background technique [0002] Prior art [1] (see I. olc, "Birefringent chain filters," J.Opt.Soc.Am.55, 621, 1965), the crystal polarization interference filter described in It is formed between two polarizers and analyzers with orthogonal polarization directions. This filter can achieve spectral line filtering with extremely narrow linewidth, but the filtering line shape is fixed and sensitive to the polarization state of the incident light. [0003] Arbitrary filtering of waveforms as described in prior art [2] (see AMMANN, E.O. 'Synthesis of optical birefringent network', in:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/26G02B27/10G02F1/39H04B10/294
Inventor 周煜刘立人阎爱民戴翠霞刘德安
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI