论文部分内容阅读
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。
In high speed multi-band unprotected space (NGI) Orthogonal Frequency Division Multiplexing (OOFDM) transmission systems, asymmetric transmitter / receiver architectures are used to partially detect the received signal through multiple general optical coherent receivers. Completely receive the entire multi-band NGI-OOFDM signal. A single laser source is used at the transmitting end to generate eight optical frequency combs with equal frequency interval of 28 GHz as a photonic carrier through a differential Mach-Zehnder external modulator and modulated by a 112 Gbit / s PDM-QPSK signal to form 8 broadbands Of all-optical NGI-OOFDM signals. The receiving end uses an asymmetric transmitter / receiver structure, that is, four common optical coherent receivers with a receiving bandwidth of 18 GHz and each receiver receives two sub-carriers and can fully receive the entire multi-band NGI-OOFDM signal. The high-speed multi-band NGI-OOFDM transmission system with this structure has an optical signal noise ratio (OSNR) cost about 9dB more than a single-carrier 112Gbit / s PDM-QPSK system with a bit error rate (BER) of 10-3. After 16,000ps / nm optical fiber dispersion and polarization perturbation, there is about 0.2dB OSNR cost after compensating by the electrical dispersion in the systematic receiving end. Finally, the transmission of 13 × 80km optical fiber link is simulated. The simulation results show that the OSNR cost is about 1.5dB compared with the case of back-to-back compensation.