Direct-Detected OFDM传输系统中光带通滤波器性能研究  

Performance of Optical Bandpass Filter System in Direct-Detected OFDM Transmission

作　　者：曹晔[1] 陈乾[1] 童峥嵘[1] 杨秀峰[1] 

机构地区：[1]天津理工大学薄膜电子与通信器件重点实验室及智能计算与软件新技术重点实验室,天津300384

出　　处：《南开大学学报（自然科学版）》2011年第6期1-5,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：天津市自然科学基金(08JCYBJC14400)

摘　　要：研究了中频结构的DD-OFDM系统.在模拟实验中,10 Gb/s的OFDM信号传输了640 km的标准单模光纤,对其光链路中滤波器带宽和阶数进行调整,分析了接收端OSNR和BER.在BER=10-3条件下,结果表明较高阶的单边带滤波器相对于普通单边带滤波器,接收端OSNR敏感度有1 dB的提高,在滤波器阶数达到8阶时,可以得到滤波器性能的极限.研究了间隔50 GHz的4路DD-OFDM的WDM系统,实现了系统传输640km的标准单模光纤,并均衡4路信道和比较了BER=10-3时各路DD-OFDM需要的OSNR.An Intermediate-frequency architecture direct-detected orthogonal frequency division multiplexing(DD-OFDM) is researched. 10 Gb/s DD-OFDM is transmitted over 640 km SSMF in the simulation experiment. The performance of optical signal to noise ratio(OSNR) and bit error rate(BER) have been analyzed by adjusting the bandwidth and order of the optical filters at transmitter and receiver. The simulation results show that OSNR can be improved 1dB in a BER=10-3 by using high order optical filters instead of common single-sideband filters at receiver-end. And then ultimate performance of the filter has been researched when filter order gets 8 orders. Meanwhile, a 4 channel DD-OFDM system with the optical carrier gap of 50GHz is simulated and equalized. The performance of OSNR in different channels after transmission 640 km SSMF with BER = 10-3 is analyzed.

关 键 词：直接检测 光滤波器 OFDM 光传输 

分 类 号：TN929.11[电子电信—通信与信息系统]