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The Research and Application of Optical Time-domain Reflectometry in Access Network

Author: ShenDongHui
Tutor: DongYi
School: Shanghai Jiaotong University
Course: Communication and Information System
Keywords: Passive Optical Network Optical Time Domain Reflectometer Dual quadrature encoder Wavelength tunable Windows CE Embedded
CLC: TN915.63
Type: Master's thesis
Year: 2010
Downloads: 134
Quote: 1
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Abstract


With the rapid development of broadband services and a variety of new businesses are emerging , substantial growth in demand for broadband network access . Passive Optical Network (PON), as the future broadband access network technology is moving in both directions of TDM-PON and WDM-PON development. Passive optical network development and application of traditional fiber link monitoring equipment , optical time domain reflectometer meter ( OTDR ) , presented a new challenge . This article describes the optical time domain reflectometer (OTDR) works and performance indicators , including dynamic range , range resolution and measurement time . By theoretical analysis , the summary of the to improve OTDR performance of various technology , such as the cumulative average technical FSK modulation technique and coding techniques . Details biorthogonal coding techniques . The PON complex network structure , such as the structure of the point-to-multipoint and multi-wavelength transmission the traditional OTDR monitoring technologies put forward a number of new technical requirements . This article summarizes and analyzes the current applications in the optical access network OTDR monitoring technology and its development trends , and a dual quadrature encoder - based wavelength tunable OTDR, on theoretical and experimental studies . Biorthogonal codec technology through the use of 64-bit length , and combined with 512 times the cumulative averaging to obtain the experimental results of the dynamic range enhancement approximately 14.7dB , thereby 6dBm into the fiber optical pulse peak power , the distance accuracy is 2 meters, the measurement of the dynamic range of 22.8 dB . The results show that the manner suggested by this paper , can be achieved to meet the the online monitoring requirements of WDM-PON fiber link wavelength tunable OTDR . The last This paper describes the design of the OTDR system based on Windows CE embedded software design and implementation process .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > Access network > Fiber optic cable connected Network
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