WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service

A technology of WDM-PON and business, applied in the field of WDM-PON system, can solve the problems such as impact of data business, achieve the effect of increasing the test distance and improving the quality of the received signal

Active Publication Date: 2012-12-12
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] However, at present, in the WDM-PON system, the single-fiber bidirectional transmission mode is commonly used on the optical line, that is, for any wavelength channel, the wavelengths belonging to different wavelength bands are us

Method used

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  • WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] The present invention proposes a novel WDM-PON system, which adopts the same wavelength section as the working wavelength in both directions, and adopts an AWG with dual working wavelength sections in the optical line network, wherein one wavelength section corresponds to the working wavelength section of the WDM-PON system, and in addition One wavelength segment is reserved as the test wavelength segment of OTDR.

[0023] Such as figure 1 The composition framework of the system shown, the WDM-PON system that does not affect the business of the present invention to carry out OTDR test, comprises:

[0024] The OLT and ONU connected through the optical fiber distribution network line, the C-band defined in DWDM (Dense Lightwave Multiplexing) is used as the working wavelength band in both directions between the two (referring to the OLT and ONU), and C1,...

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Abstract

The invention relates to a WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service, and the system comprises an OLT (optical line terminal) and ONU (optical network unit), which are connected with each other through an optical fiber distribution network circuit, a waveband C defined in DWDM (dense wavelength division multiplexing) is bi-directionally adopted between the OLT and the ONU as a working wavelength band, OTDR adopts a wave band L defined in DWDM as a working wavelength band, an AWG (arrayed waveguide grating) in the optical fiber distribution network circuit is periodic and can work simultaneously in the waveband C and the waveband L; a C/L WDM device in the optical fiber distribution network circuit completes complexing and division of optical signals of two working wavelength bands in the WDM-PON system and the OTDRR. The WDM-PON system for performing the OTDR test without influencing the service is simple and feasible, low in cost, high in reliability and easy to popularize. Due to the adoption of the WDM-PON system, the OTDR test can be conducted by a passive optical network system under the condition that the user service is not interrupted, and the OTDR reflected optical signal of each branch distribution optical fiber is free from being overlapped on time domain at the receiving moment of OTDR in the OTDR test.

Description

technical field [0001] The invention relates to a WDM-PON system in the field of optical fiber communication, in particular to a WDM-PON system for performing OTDR testing without affecting services. Background technique [0002] WDM-PON (Wavelength Division Multiplexing PON, wavelength division multiplexing passive optical network) is a passive optical network that uses wavelength division multiplexing as an access technology. It has the advantages of exclusive bandwidth for each user, point-to-point leased line transmission in the form of wavelength division, mutual isolation between services or mutual isolation between users without affecting each other, etc., and has the advantage of point-to-multipoint in the application form. The direction of a generation of optical access technology. [0003] The English full name of OTDR is Optical Time Domain Reflectometer, which means Optical Time Domain Reflectometer in Chinese. OTDR is a precise optoelectronic integrated instru...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04B10/08
Inventor 曹桦
Owner FENGHUO COMM SCI & TECH CO LTD
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