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Channel monitoring apparatus in wavelength division multiplexing system

A monitoring device and channel technology, applied in wavelength division multiplexing systems, optical multiplexing systems, multiplexing communications, etc., can solve the problems of limiting the capacity of WDM systems, complex circuit implementation, and limitation of the number of channels.

Inactive Publication Date: 2004-04-14
ERICSSON-LG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The WDM system limits the number of channels, thus limiting the capacity of the WDM system
[0011] As mentioned above, in the traditional WDM system, the implementation of the circuit for generating the audio frequency and monitoring the channel is very complicated, moreover, the audio frequency should be set at the effective frequency interval relative to each adjacent channel
This leads to a limitation on the number of channels
As a result, the number of channels used in WDM systems is also limited

Method used

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  • Channel monitoring apparatus in wavelength division multiplexing system
  • Channel monitoring apparatus in wavelength division multiplexing system
  • Channel monitoring apparatus in wavelength division multiplexing system

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Embodiment Construction

[0076] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0077] The following description with reference to the accompanying drawings relates to the invention which monitors each channel of a multiplexed optical signal at each channel monitoring point using an AWG.

[0078] Such as figure 2 As shown, a WDM system according to an embodiment of the present invention includes: laser diodes 21-1 to 21-N used in the WDM system for emitting optical signals with different unique wavelengths λ1 to λn; a multiplexer 22 for multiplexing the optical signals received from the laser diodes 21-1 to 21-N; first, second and third amplifiers 23, 24 and 25 for amplifying and transmitting A multiplexed signal produced by the optical multiplexer 22; an optical demultiplexer 26 for demultiplexing the amplified signal received from the third amplifier 25; and a channel monitoring unit 30 for utiliz...

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Abstract

A channel monitoring apparatus in a WDM system comprises: a plurality of tap couplers; an optical switch; an AWG module; a plurality of optical detectors; a plurality of trans-impedance circuits; a channel multiplexer; a fourth amplifier; an analog / digital converter; and a microprocessor.

Description

technical field [0001] The present invention relates to a kind of wavelength division multiplexing (WDM) system, relate in particular to the channel monitor device in a WDM system, be used for utilizing arrayed waveguide grating (AWG) to multiplex the channel of optical signal at each channel monitor point to monitor. Background technique [0002] One method of monitoring channels in a typical WDM system utilizes audio frequency. Such as figure 1 A structure for realizing the method shown includes: a plurality of optical transmitter modules 11-1 to 11-N for transmitting optical signal channels, each channel having a unique audio frequency; an optical multiplexer 12 , for multiplexing optical signals received from a plurality of optical transmitter modules 11-1 to 11-N; a post-amplifier 13 as a first amplifier, an in-line amplifier 14 as a second amplifier, and A pre-amplifier 15 as the third amplifier, each amplifier is used to amplify the multiplexed signal produced by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04B10/077H04B10/079H04J14/02
CPCH04B10/077H04B10/07955H04J14/0221H04J14/02H04J14/0305H04J14/02216H04B17/00
Inventor 郑求洪
Owner ERICSSON-LG