摘要
单载波频域均衡技术在无线通信中是极为成熟且研究广泛的信道均衡及补偿技术,该技术采用高速数字信号处理将电信号从时域变换到频域进行均衡补偿。在光纤通信系统中,提出采用单载波频域均衡技术对接收信号进行电域色散补偿,在10 Gb/s的单边带幅移键控(ASK)调制光信号经过50,80和100 km普通单模光纤传输之后,验证了频域均衡对色散补偿的效果。其中单边带ASK调制光信号基于有限冲击响应希尔伯特变换,利用一个双臂马赫-曾德尔(MZ)调制器级联一个相位调制器来产生。结果证明,频域均衡模型能有效提高眼图开启度和降低时钟抖动,随着传输距离的增加,改善效果更加显著。最后在分析系统均衡和补偿效果参数的基础上,得出了实现最佳频域均衡效果的单边带调制点。
Single-carrier frequency domain equalization（SC-FDE）,as a mature technique in wireless commutation,is widely researched for signal equalization and compensation utilizing high speed electronic devices such as digital signal processor,A SC-FDE technique in optical communication system for received signal dispersion compensation is proposed and demonstrated.After 50 km,80 km,100km transmission for a 10 Gb/s amplitude shift keying（ASK） single sideband（SSB） signal on a single mode fiber,the dispersion of optical signal is effectively compensated by adopting SC-FDE technique.The SSB signal is generated by a dual-arm Mach-Zehnder modulator cascading a phase modulator based on Hilbert finite impulse response digital filter.The results demonstrate that the eye opening and the clock recovery is improved,and the effect of compensation is enhanced as the transmission distance increases in proposed SC-FDE model.At last,the SSB modulation location for achieving the best SC-FDE effect is also obtained.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第7期1971-1976,共6页
Acta Optica Sinica
基金
国家973计划(2010CB328300)
国家自然科学基金(600837004
60777010)
国家863计划(2009AA01Z253
2007AA01Z260)
曙光学者基金
教育部信息光子学与光通信重点实验室(北京邮电大学)开放基金资助课题
关键词
光通信
单载波频域均衡
单边带调制
色散补偿
optical communication
single-carrier frequency domain equalization
single-sideband modulation
dispersion compensation
