On-Line Polarization Mode Dispersion Monitoring and Mitigation Technique using Acousto-Optic Tunable Filter

• Main Authors: Bao-Jang Tseng, 曾保彰
• Other Authors: Chen-Wen Tarn
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/78654950228085975684

博士 === 國立臺灣科技大學 === 電子工程系 === 95 === We propose an on-line, wide-band, adaptive, and no data traffic interruption polarization mode dispersion (PMD) monitoring system based on the modulated amplified spontaneous emission (ASE) and cascaded acousto-optics tunable filters (AOTFs) techniques. This method is applicable to a long-haul, multiple erbium-doped fiber amplifiers (EDFAs), dense wavelength division multiplexing (DWDM) optical transmission system. Due to the unique properties of the non payload signal bearing and wide-band existence, the ASE noise of one of the EFDAs is employed as the supervisory (SV) signal and becomes traceable during transmission by modulating it with low-frequency rf signal. In addition, the AOTFs are used seriously at the receiver side due to its prominently refractive-index adjustability and wide channel scanning properties. This method is based on frequency domain measurement, which has many advantages for implementation. Using the fixed-analyzer method, PMDs of different wavelength bands which range from 1545-1580nm of an DWDM optic-fiber communication system can be found by adaptively changing the radio frequency of the AOTF. The resolution of the proposed monitoring system can be improved by cascading the AOTFs at the receiver side. To prove the validity of our method, the theoretical results are compared with the experimental data. A high degree of agreement is observed.