中文摘要：

在高速多带无保护间隔（NGI）光正交频分复用（OOFD M）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112 Gbit/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16,0ps/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。

英文摘要：

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.