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Compensation method for polarization mode dispersion by using high birefringence uniform fiber grating and structure thereof

A uniform fiber grating and polarization mode dispersion technology, applied in the coupling of optical waveguides, electrical components, electromagnetic wave transmission systems, etc., can solve the problems of complex manufacturing process, poor repeatability, low reliability, etc., and achieve high process requirements and yield. High, easy to make effects

Inactive Publication Date: 2008-12-31
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a method and structure for compensating polarization mode dispersion using a high-birefringence uniform fiber grating. The PMD compensator is simple to prepare and has a smart structure. There are congenital defects such as complex manufacturing process, high cost, poor repeatability and low reliability

Method used

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  • Compensation method for polarization mode dispersion by using high birefringence uniform fiber grating and structure thereof
  • Compensation method for polarization mode dispersion by using high birefringence uniform fiber grating and structure thereof
  • Compensation method for polarization mode dispersion by using high birefringence uniform fiber grating and structure thereof

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Embodiment 1

[0036] Such as image 3 Shown, the variable delay unit 4 of the PMD compensator based on the high birefringence uniform fiber grating of the present invention design is made up of two parts: a high birefringence uniform fiber grating 1 and a width for adhesion along the lengthwise direction Variation of carrier2. The carrier 2 has a uniform thickness, but its width is a varying function f(z) along the length z of the carrier. One end of the carrier 2 is fixed, while the other end is placed in a free state. It functions as a grating axial strain adjustment device. Figure 5 It is a top view of a variable delay line structure based on high birefringence uniform fiber grating. Choose a carrier with a wedge-shaped structure, the width of the carrier increases linearly with the length, which can be described mathematically as follows:

[0037] w ( z ) = w fix + ...

Embodiment 2

[0043] When applying the offset, the offset is applied along the -y direction. This situation is equivalent to applying a tensile strain to the grating, which makes the Bragg period of the grating in the entire axial direction longer. The effect diagram is as follows Figure 6 (b) shown. Other steps are then the same as embodiment one.

Embodiment 3

[0045] The function of the variation of the width of the carrier along the length direction used in the above two embodiments is linearly increasing. In practical applications, it can also decrease linearly, increase nonlinearly or decrease nonlinearly. The purpose achieved is the same, even if the value of the variable delay line DGD is dynamically adjustable. The schematic diagrams of the loading objects in these three cases are as follows: Figure 9 (a) (b) (c) shown.

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Abstract

The method and structure using high dual refraction even optical fiber grating compensation polarization mould chromatic aberration features in the even optical grating writing to the polarizing optical fiber, a carrier with the width changeable along the length direction with one end fixed and one free. Fixing the optical grating with glue or some other ways to the carrier with the axial direction of the grating consistent with the carrier length, forming a changeable unit, and the carrier functioning as the strain adjusting device along the axis of the optical grating. It connects with a polarization controller and a maintaining fiber or dual refraction crystalline through the three end ring to form a making process with easy realization, low cost, flexible structure, and dynamic adjustable polarization mould chromatic aberration compensator.

Description

technical field [0001] The present invention relates to a method and structure for compensating fiber polarization mode dispersion (PMD, Polarization Mode Dispersion) by using high birefringence uniform fiber grating and its preparation; The invention relates to PMD compensation; it belongs to the technical field of optical fiber communication. Background technique [0002] Due to the increasing demand for information, large-capacity and long-distance transmission will always be the goal of optical fiber communication technology. From 10Gb / s to 40Gb / s, especially above 40Gb / s, optical fiber PMD, which was not paid attention to by people, is gradually It has become the main obstacle restricting the upgrade and development of optical fiber communication system. Therefore, since the 1990s, PMD compensation technology has been widely concerned by researchers at home and abroad. [0003] PMD compensation technology can be simply divided into two categories: electrical domain PM...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/34H04B10/18H04B10/2569
Inventor 王目光张建勇许鸥张峰刘志明
Owner BEIJING JIAOTONG UNIV