Tseng Bao-Jang, Tarn Chen-Wen
National Taiwan University of Science and Technology, #43 Keelung Road, Section 4, Taipei 106, Taiwan.
Appl Opt. 2009 Mar 1;48(7):C92-7. doi: 10.1364/ao.48.000c92.
Without interruption or affecting the transmission of ordinary payload channels, we propose a real time polarization mode dispersion (PMD) monitoring system for long-haul, multiple erbium-doped fiber amplifier (EDFA), dense wavelength division multiplexing (DWDM) optical fiber transmission using modulated amplified spontaneous emission (ASE) of one of the EDFAs as the supervisory (SV) signal source. An acousto-optic tunable filter (AOTF) at the receiver side is adopted to scan the spectrum of the transmitted ASE SV signal. Using the fixed-analyzer method, PMDs of different wavelength bands that range from 1545 to 1580 nm of a DWDM fiber-optic communication system can be found by adaptively changing the radio frequency of the AOTF. The resolution and the measuring range of the proposed monitoring system can be significantly improved by cascading the AOTFs at the receiver side.
在不中断或不影响普通净荷信道传输的情况下，我们提出了一种用于长距离、多掺铒光纤放大器（EDFA）、密集波分复用（DWDM）光纤传输的实时偏振模色散（PMD）监测系统，该系统使用其中一个EDFA的调制放大自发辐射（ASE）作为监测（SV）信号源。在接收端采用声光可调滤波器（AOTF）来扫描传输的ASE SV信号的频谱。使用固定分析仪方法，通过自适应改变AOTF的射频，可以找到DWDM光纤通信系统中1545至1580 nm不同波长波段的PMD。通过在接收端级联AOTF，可以显著提高所提出监测系统的分辨率和测量范围。
