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

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...

AI Technical Summary

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 used in both directions. At this time, if the OTDR wants to test, No matter which wavelength band you choose, it will affect the online user data service, that is to say, the OTDR test can only be performed when the service is interrupted.

Images