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Optical interleaving filtering device for realizing polarization wave combination function and method thereof

A filter device and wave function technology, applied in polarized optical fiber, optical waveguide light guide, polarization multiplexing system, etc., can solve the problems of high cost, complex structure, large insertion loss, etc., to save device cost, improve performance, and simple structure Effect

Active Publication Date: 2013-01-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The function of polarization maintenance cannot be well realized, and polarization multiplexing cannot be performed for signals with orthogonal polarizations of adjacent channels; or the structure is complex, the volume is large, the cost is too high, and the insertion loss is relatively large

Method used

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  • Optical interleaving filtering device for realizing polarization wave combination function and method thereof
  • Optical interleaving filtering device for realizing polarization wave combination function and method thereof
  • Optical interleaving filtering device for realizing polarization wave combination function and method thereof

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Embodiment 1

[0042] This embodiment provides an optical interleaving filtering device for realizing the polarization multiplexing function, which can be used in a polarization multiplexing system, such as image 3As shown, the device includes:

[0043] Polarization multiplexer 21, optical circulator 22 and polarization maintaining fiber 23, wherein the polarization maintaining fiber 23 is provided with a Bragg grating (FBG, Fiber Bragg Grating), specifically on the fast and slow axes of the polarization maintaining fiber 23 are written Bragg gratings 24, 241, Bragg gratings 24, 241 can reflect the X polarization state optical signal and the Y polarization state optical signal respectively; The frequency difference matches the frequency difference between adjacent odd and even channels in the applied communication system;

[0044] Wherein, polarization multiplexer 21 is provided with X polarization direction input end 26, Y polarization direction input end 27 and output end 211, and the X ...

Embodiment 2

[0056] This embodiment provides an optical interleaving filtering method for realizing the polarization multiplexing function, which can be used in a polarization multiplexing system. This method can use the device given in the first embodiment above to filter the input optical signal. The specific method includes Follow the steps below:

[0057] like image 3 As shown, when the optical signal 28 with the X polarization state or the optical signal 29 with the Y polarization state is respectively input into the polarization combiner 21 from the X polarization direction input end 26 or the Y polarization direction input end 27 of the polarization combiner 21, After performing multiplexing in the polarization multiplexer 21 ( image 3 The middle arrow A represents the polarization direction of the optical signal of the odd-wave channel, and the arrow B represents the polarization direction of the optical signal of the even-wave channel), and is output to the optical circulator 2...

Embodiment 3

[0060] This embodiment provides another optical interleave filter device with polarization multiplexing function, which can be used in ordinary single-polarization communication systems or polarization orthogonal multiplexing systems, such as Figure 4 As shown, the device includes:

[0061] Two polarization splitters 310, 320, two polarization multiplexers 31, 32, two optical circulators 33, 34, two polarization maintaining fibers 35, 36 and a polarization maintaining fiber coupler 39; wherein, each There are Bragg gratings on the polarization-maintaining fibers, specifically, Bragg gratings are written on the fast and slow axes of each polarization-maintaining fiber, and the Bragg gratings written on the fast and slow axes of the polarization-maintaining fibers are respectively for X polarization state Reflection of optical signal and Y polarization state optical signal; in practice, the frequency difference of the center frequency of the reflection spectrum of the Bragg gra...

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Abstract

An optical interleaving filtering device and method for realizing the function of polarization wave-combining are provided. The optical interleaving filtering device includes: a polarization wave-combiner (21,31,32), an optical circulator (22,33,34) and a section of polarization maintaining optical fiber (23,35,36) engraved with Bragg gratings (24,241,351,352,361,362). The polarization wave-combiner (21,31,32) is provided with an input end (26) of X polarization direction and an input end (27) of Y polarization direction, and the output end (211,B1,C1) of the polarization wave-combiner (21,31,32) is connected with any end of the polarization maintaining optical fiber (23,35,36) via the optical circulator (22,33,34) whose output end (A3,B3,C3) is used as the output end of the device. The optical interleaving filtering device has a simple structure and can save cost, and the performance of the wave divided multiplexing system is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to an optical interleaving filtering device and method for realizing polarization multiplexing function. Background technique [0002] In recent years, the demand for transmission service capacity of the backbone optical transport network has increased sharply, and code patterns that use the polarization characteristics of light to carry information or achieve performance improvement emerge in an endless stream, especially in submarine cable transmission, where adjacent channels are polarization-orthogonal communications The system can more effectively improve the performance of the long-distance optical fiber transmission system, but for these modulation patterns that require special polarization processing for adjacent channels, it cannot be realized using ordinary optical multiplexing and demultiplexing devices, so it is necessary to achieve a performance-price It is an optical interlea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G02B6/024G02B6/02
CPCG02B6/29302G02B6/02057G02B6/29386H04J14/02H04J14/06
Inventor 李朝晖吕超曾理程凌浩杨彦甫刘磊
Owner HUAWEI TECH CO LTD