Bi-pass mach-zehnder interferometer type polarization-independence top-comb-shaped optical fiber filter

A technology of optical fiber filter and interferometer, applied in the field of optical fiber, can solve the problems of poor temperature stability of fiber grating filter, poor tolerance of signal fidelity and signal wavelength drift, increase of DWDM system requirements, etc., to achieve system saving Cost, simple structure, effect of reducing requirements

Inactive Publication Date: 2012-07-25
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

Among them, fiber grating is currently the most mature type of fiber-optic filter, but the temperature stability of fiber grating filter is not very good, thus limiting its application range
In addition, due to the small 3dB b

Method used

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  • Bi-pass mach-zehnder interferometer type polarization-independence top-comb-shaped optical fiber filter
  • Bi-pass mach-zehnder interferometer type polarization-independence top-comb-shaped optical fiber filter
  • Bi-pass mach-zehnder interferometer type polarization-independence top-comb-shaped optical fiber filter

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[0021] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation and protection scope of the present invention are not limited thereto.

[0022] like figure 1 As shown, the polarization-independent flat-top comb fiber filter based on the improved double-pass Mach-Zehnder interferometer includes two fiber couplers, a polarization controller and a section of high birefringence fiber, and the two fiber couplers are cascaded to form For the Mach-Zehnder interferometer, the polarization controller and the high birefringence fiber are connected in series in the second ring away from the port of the interferometer. The working principle of the present invention is as follows:

[0023] According to the interference theory of light, the transmission characteristic of the present invention can be expressed as follows by Jones matrix:

[0024] [ ...

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Abstract

The invention discloses a bi-pass mach-zehnder interferometer type polarization-independence top-comb-shaped optical fiber filter. The optical fiber filter comprises two optical fiber couplers, a polarization controller and a section of high birefringence optical fiber, wherein the first optical fiber coupler and the second optical fiber coupler are cascaded to form a mach-zehnder interferometer, and are connected in series to from a first closed loop; and the polarization controller, the high birefringence optical fiber and the second coupler are connected in series to form a second closed loop, so that the bi-pass mach-zehnder interferometer is formed. According to the fiber filter, the output of the polarization-independence top-comb-shaped band pass can be realized, the requirement on the wavelength of a DWSM (dense wavelength division multiplexing) system is lowered greatly as the tolerance for the drifting of signal wavelength is high, and the system cost is saved.

Description

technical field [0001] The invention belongs to the field of optical fiber technology and relates to a polarization-independent flat-top comb fiber filter based on a Mach-Zehnder interferometer. Background technique [0002] With the development of communication technology, communication services will turn to broadband services represented by high-speed IP data and multimedia, which puts higher and higher requirements on the bandwidth and capacity of optical communication networks. Dense Wavelength Division Multiplexing (DWDM) technology has become the main technical means of increasing the capacity of optical fiber transmission network because of its great improvement of the capacity of optical fiber communication system. [0003] The multi-channel filter is an important device in the DWDM optical fiber communication system, and its performance is directly related to the transmission quality of the optical fiber communication network. Among them, fiber grating is currently...

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Application Information

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IPC IPC(8): G02B6/27
Inventor 武晓卫沈维王威黄旭光
Owner SOUTH CHINA NORMAL UNIVERSITY
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