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Double optical fiber ring cascading depolarization device irrelevant to input polarization state

An optical fiber ring and polarization state technology, applied in the field of optical fiber rings, can solve the problems of poor polarization state stability, large size, inconvenient use process, etc., and achieve the effect of high stability and small device size

Inactive Publication Date: 2012-10-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since each polarization controller not only has three degrees of freedom, but also has a large volume and poor polarization state stability, it is extremely inconvenient to use

Method used

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  • Double optical fiber ring cascading depolarization device irrelevant to input polarization state
  • Double optical fiber ring cascading depolarization device irrelevant to input polarization state
  • Double optical fiber ring cascading depolarization device irrelevant to input polarization state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment one: see figure 1 , the input polarization state-independent dual-fiber ring cascaded depolarizer is composed of two fiber rings (1, 2) cascaded, that is, any port fiber of fiber ring 1 is fused with any port fiber of fiber ring 2 . Each optical fiber ring (1, 2) is composed of a single-mode optical fiber whose length is greater than the coherence length of the depolarized light and a 2×2 single-mode optical fiber coupler (5, 6). The optical fiber in the ring is coiled in multiple turns, so that the birefringence effect introduced by bending and twisting of the optical fiber has the polarization conversion effect of a half-wave plate. The fiber ring decomposes the input light into through light and light components that circulate different times in the ring. The fiber ring has the function of polarization decomposition of the input light. The light components of the second cycle have the same polarization state; when the splitting ratio of the coupler in t...

Embodiment 2

[0065] Embodiment 2: The special feature is that its realization and characteristic measurement are given as follows:

[0066] (1) Implementation of this depolarizer: see figure 1 . Two sections of single-mode bare fiber are cut, the lengths of which are respectively greater than the coherence length of the depolarized light source, and the lengths L1 and L2 of the two sections of fiber satisfy: , where m, n, a, b are natural numbers, and they are not zero at the same time. The design of ring length satisfying the above formula can make the light components of different cycle times incoherent. The two optical fibers according to (5) formula and , calculate the appropriate bending radius of the fiber, and wind it into a fiber coil with the function of a half-wave plate. When the fiber is coiled, it is necessary to pay attention to as little twisting as possible to meet the condition that the torsional birefringence is much smaller than the bending birefringence. To judge...

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Abstract

The invention relates to a double optical fiber ring cascading depolarization device irrelevant to an input polarization state. The depolarization device is formed by cascading two optical fiber rings, namely the depolarization device is formed by welding any one port optical fiber of one optical fiber ring with any one port optical fiber of the other optical fiber ring. The depolarization deviceis characterized in that each optical fiber ring consists of a single mode optical fiber of which the length is greater than the coherence length of depolarized light and a 2*2 single mode optical fiber coupler; the optical fibers in the rings are wound in a plurality of circles, so that the optical fibers not only has the double refraction effect led in by bending and twisting, but also has the depolarization conversion effect of a half wave plate; each optical fiber ring decomposes input light into straight light and optical components circulated in the ring for different times and has a function of carrying out depolarization decomposition on the input light, wherein the straight light and the light components circulated for even times have the same polarization state and the light components circulated for odd times have the same polarization state; when the splitting ratio of the coupler in each optical fiber ring is 1:2, optical powers of two groups of depolarization separation are equal; the two optical fiber rings realized according to a method are respectively fixed on die plates so as to keep the depolarization conversion characteristic stable; and after the two optical fiber rings are cascaded and welded, the two optical fiber ring die plates are twisted, so that depolarization conversion vectors of the two optical fiber rings are vertical and orthogonal mutually, and the input light in any polarization state can be depolarized.

Description

technical field [0001] The present invention relates to the realization of a double-fiber ring cascaded depolarizer for any input light polarization state depolarizer without any adjustment during use, especially a fiber ring composed of a single-mode fiber coupler and a single-mode fiber , by optimizing the splitting ratio of the coupler; adjusting the coiled fiber in the ring, so that the birefringence effect caused by the bending and twisting of the fiber can realize the half-wave plate effect of polarization conversion; by adjusting the main axis of the line birefringence effect of the two fiber rings The azimuth angle makes the polarization conversion vectors of the two optical fibers orthogonal to each other, so that the depolarization of input light with any polarization state can be realized. Background technique [0002] Polarization random perturbation is a problem that has plagued high bit rate optical communication and optical sensing systems for a long time. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/27G02B6/255
Inventor 王春华李力王廷云郝文月王佳世范为杰
Owner SHANGHAI UNIV
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