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Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer

An optical add-drop multiplexing and self-adaptive technology, applied in wavelength division multiplexing systems, electromagnetic wave transmission systems, electrical components, etc., which can solve the problem of decreased dynamic range of system line attenuation, large volume and large attenuation of the channel power adjustment method. and other problems, to achieve the effect of simple equipment adjustment and parameter setting, small impact on system transmission performance, and small insertion loss

Inactive Publication Date: 2009-05-27
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the optical amplifier cannot monitor the optical power change of each channel, it is impossible to distinguish the optical power change caused by the increase or decrease of the number of optical channels and the optical power change caused by the line attenuation change
In this way, when the optical power of some optical channels changes drastically, it will not only be unable to perform proper analysis and processing according to the specific situation, but will also make the originally good quality signal modulation become very poor.
Although this kind of situation is rare, it is also a very serious technical hidden danger under the requirements of carrier-class transmission quality.
[0004] 2. As for the flatness of the optical path, the general problem in the point-to-point transmission system is not enough to affect its transmission performance, because the change of line attenuation has a balanced impact on the transmission signal of each optical path
[0007] These two methods have a good effect of channel flatness adjustment, but the structure is complex and the cost is high
The channel power adjustment method also has the disadvantages of large volume and large attenuation
Moreover, for the OADM system, since each station basically has upper and lower optical signals, and there is a possibility of loop protection switching in each optical line segment, to achieve a better adjustment of optical path flatness, it is necessary to use two transmission directions at each node. Both flatness adjustments are performed, which is too expensive from a cost point of view and the overall performance of the device
Especially the channel power adjustment method, because the insertion loss is too large, it will also have a great impact on the system transmission performance
[0008] In addition, due to the extensive use of optical amplification technology in the dense wavelength division multiplexing (DWDM) system, the transmission characteristics of the digital transmission system have brought many laws of the analog system, resulting in a significant drop in the dynamic range of the system line attenuation
At the same time, the change of line attenuation and the change of transmission route will cause the optical signal of the transmission path to change, while the optical power of the uplink signal of the OADM node remains basically unchanged, which will cause the flatness of the optical signal on the subsequent line to deteriorate. Affects the transmission performance of some optical channels

Method used

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  • Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer
  • Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer
  • Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 2 As shown, it is a device without an optical preamplifier, a dispersion compensation device, a gain flattening device, and a main optical path performance monitoring device 2. It is composed of the following components, and its connection relationship is:

[0059] Adjustable optical attenuator 1, optical splitter, photoelectric conversion and amplifier 4, optical add-drop multiplexer 3, optical splitter, photoelectric conversion and amplifier 4 groups, single-chip microcomputer and data collector 6, VOA driver 5, adjustable optical attenuator 1 in order connected to form a closed loop;

[0060] The adjustable optical attenuator 1, light splitter, photoelectric conversion and amplifier 4, single chip microcomputer and data collector 6, VOA driver 5, and adjustable optical attenuator 1 are sequentially connected to form another closed loop.

[0061] Its main components and working principle are the same as those of the first device, but the optical pream...

Embodiment 2

[0063] Such as image 3 As shown, it is a device in which an optical preamplifier, a dispersion compensation device, a gain flattening device, and a main optical path performance monitoring device 2 are arranged before the adjustable optical attenuator 1. It is composed of the following components, and their connection relationship is:

[0064] After optical preamplifier and dispersion compensation device, gain flattening device, main optical path performance monitoring device 2, adjustable optical attenuator 1, light splitting, photoelectric conversion and amplifier 4, optical add / drop multiplexer 3, light splitting, photoelectric conversion 4 groups of amplifiers, single-chip microcomputer and data collector 6, VOA driver 5, and adjustable optical attenuator 1 are sequentially connected to form a closed-loop circuit;

[0065] After optical preamplifier and dispersion compensation device, gain flattening device, and main optical path performance monitoring device 2, adjustabl...

Embodiment 3

[0068] Such as Figure 4 As shown, it is a device equipped with an optical preamplifier, a dispersion compensation device, a gain leveling device, and a main optical path performance monitoring device 2 before and after the adjustable optical attenuator 1. It is composed of the following components, and its connection relationship is:

[0069] After the optical preamplifier and dispersion compensation device, gain leveling device, main optical path performance monitoring device 2, adjustable optical attenuator 1, optical preamplifier and dispersion compensation device, gain flattening device, main optical path performance monitoring device 2 , light splitting, photoelectric conversion and amplifier 4, optical add-drop multiplexer 3, light splitting, photoelectric conversion and amplifier 4 groups, single-chip microcomputer and data collector 6, VOA driver 5, adjustable optical attenuator 1 are connected in sequence to form a closed loop;

[0070] After optical preamplifier and...

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PUM

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Abstract

The invention relates to optical wavelength division multiplexing transmission system, applying to transmission system of optical add and drop multiplexer (OADM) as well as to node of OADM. The device includes following parts: (1) unit for monitoring optical power composed of optoelectronic conversion and amplifying circuit in optical path; (2) arithmetic / control circuit unit composed of single chip, data acquisition and variable optical attenuator; (3) OADM and optical amplifier being as important part of node of OADM. The invention only adds one set of control circuit and variable optical attenuator, providing features of low cost simple structure, easy of adjusting device and setting parameters, fast response speed, small insertion loss. The technical scheme is not affected by number of optical path.

Description

technical field [0001] The invention relates to an optical wavelength division multiplexing (WDM) transmission system, which is mainly applied to the optical add-drop multiplexing (OADM) transmission system, and is also applicable to the OADM node of the wavelength division multiplexing transmission system. Background technique [0002] 1. The signals of WDM equipment and optical add-drop multiplexing OADM equipment are transmitted through optical fibers. With the aging of the optical fiber and the change of the line condition, the attenuation of the optical line will change to a certain extent, which will cause the change of the received optical signal-to-noise ratio of the system, and then affect the transmission performance of the system. At the same time, in OADM equipment or WDM equipment including OADM nodes, due to the change of optical line attenuation, the optical power of the downlink optical path and the through optical path will change, while the optical power of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/08H04B10/02H04B10/07H04B10/294
Inventor 雷非王红启丁勇陈静伟
Owner FENGHUO COMM SCI & TECH CO LTD