高速多带NGI-OOFDM传输系统中的非对称发射机与接收机设计  

Design of asymmetrical transmitter and receiver in high-speed multi-band NGI-OOFDM transmission systems

作　　者：张洪波[1] 张静[1] 邓明亮[1] 邱昆[1] 

机构地区：[1]电子科技大学通信与信息工程学院,光纤传感与通信教育部重点实验室,四川成都611731

出　　处：《光电子．激光》2013年第11期2116-2120,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61071097;61107060);高等学校博士点基金(20090185110010)资助项目

摘　　要：在高速多带无保护间隔(NGI)光正交频分复用(OOFDM)传输系统中,采用非对称发射机/接收机结构,对接收信号通过多个通用光相干接收机进行部分探测,可一次完整接收整个多带NGI-OOFDM信号。发射端采用单个激光源,通过差分马赫曾德尔外调制器产生8根等频率间隔为28GHz的光频梳作为光子载波,经112Gbit/s PDM-QPSK信号调制,波分复用后形成8路宽带的全光NGI-OOFDM信号。接收端采用非对称发射机/接收机结构,即采用4个接收带宽为18GHz的通用光相干接收机,每个接收机接收2路子载波,可以完整接收整个多带NGI-OOFDM信号。采用本文结构的高速多带NGI-OOFDM传输系统,误码率(BER)为10-3时,光信噪比(OSNR)代价较单载波112Gbit/s PDM-QPSK系统多约9dB。经16,000ps/nm光纤色散及偏振扰动,在系统接收端通过电色散补偿后,约有0.2dB OSNR代价。最后对传输13×80km的光纤链路进行了仿真,仿真结果表明,与背靠背情况相比,在进行电色散补偿后,OSNR代价约1.5dB。The common optical coherent receivers cannot receive the high-speed m ulti-band non-guard interval optical orthogonal frequency divisio n multiplexing （NGI-OOFDM） signals for bandwidth limitation,while the proposed asymmetrical transmitter and receiver architecture can achieve it without any addtional optical signal-t o-noise ratio （OSNR） penalty.In th e asymmetrical transmitter and receiver architecture,a single laser source is utilized to generate frequency c omb source as the optical sub-carriers of the proposed NGI-OOFDM system with frequency spacing of 28GHz by differenti al Mach-Zehnder external modulator.Each of the 8carriers of the comb source is encoded with 112Gbit/s p olarization division multiplexed quadrature phase shift keying （PDM-QPSK）.At the receiver,an array consisting of 4common optical intradyne coherent receivers is employed to receive the high- speed signal,each intradyne coherent receiver can receive 2subcarriers of the OOFDM signal.In this work,the back-to-back simulation results show that the OSNR penalty of the proposed scheme is about 9dB compared with 112Gbit/s intradyne coherent PDM-QPSK singl e carrier system at BER of 10-3. For 16,0ps/nm chromatic dispersion （CD） and electrical CD compensation,the OS NR penalty of the proposed scheme is about 0.2dB.13×80km fiber link transmission is also conducted,and t he OSNR penalty is about 1.5dB with the electrical CD compensation compared with the back-to-back simulation result.

关 键 词：光纤通信 无保护间隔光正交频分复用(NGI-OOFDM) 非对称发射机 接收机 光相干接 收机 色散 偏振复用 

分 类 号：TN913.7[电子电信—通信与信息系统]