基于时分复用的80 GBaud光收发器
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摘要
基于时分多路复用技术实现了1种兼容脉冲幅度调制的高波特率光收发器。通过光电协同设计,在订制电路的双端驱动下,马赫-曾德尔干涉仪型高速光开关产生出半高宽仅11.9ps的采样脉冲。在20GHz时钟的同步驱动下,4路级联光开关为4路并行通道切分出4个宽11.5ps的时隙以实现并行调制或探测,并有1个宽4ps的时隙用于时钟恢复,从而在仿真器上将4路20Gbps位流复用到单路80GBoud光链路上。采用调制深度为10dB的调制器,该光收发器的输出消光比可达到2.32dB,而其所造成的7.84dB插入损耗也满足商用光收发器的光功率预算要求。
Based on time division multiplexing(TDM)technology,a high baud rate optical transceiver is proposed in this paper,which is compatible with pulse amplitude modulation.Narrow sampling pulses of only 30 ps bottom width,or 11.9ps full width at half maximum are repeatedly generated by Mach-Zehnder interferometer(MZI)switch with its specific double rail driver.The4-stage cascaded high speed switches with synchronous drivers at 20 GHz are employed to create four 11.5ps recurrent time slots for parallel modulation and detection,and one 4ps time slot for clock recovery.Then a transmission channel at 80 GBaud with 4bit streams at 20 Gbps is realized in simulator.The extinction ratio corresponding to the TDM mechanism can reach 2.32 dB with10dB depth modulator.And the commercial optical power budget can cover the 7.84 dB insertion loss produced by the TDM structure.
Based on time division multiplexing(TDM)technology,a high baud rate optical transceiver is proposed in this paper,which is compatible with pulse amplitude modulation.Narrow sampling pulses of only 30 ps bottom width,or 11.9ps full width at half maximum are repeatedly generated by Mach-Zehnder interferometer(MZI)switch with its specific double rail driver.The4-stage cascaded high speed switches with synchronous drivers at 20 GHz are employed to create four 11.5ps recurrent time slots for parallel modulation and detection,and one 4ps time slot for clock recovery.Then a transmission channel at 80 GBaud with 4bit streams at 20 Gbps is realized in simulator.The extinction ratio corresponding to the TDM mechanism can reach 2.32 dB with10dB depth modulator.And the commercial optical power budget can cover the 7.84 dB insertion loss produced by the TDM structure.
引文
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[3]SUN Chen,WADE M T,LEE Y,et al.Single-chip microprocessor that communicates directly using light[J].Nature,2015,528(24):534-538.
[4]SCHOW C L,DOANY F E,RYLYAKOV A V,et al.A 24-channel,300Gb/s,8.2pJ/bit,full-duplex fibercoupled optical transceiver module based on a single“Holey”CMOS IC[J].J Light Technol,2011,29:542-553.
[5]ASSEFA S,SHANK S,GREEN W,et al.A 90nm CMOS integrated nano-photonics technology for 25Gbps WDM optical communications applications[J].IEEEInternational Electron Devices Meeting.2012,48(11):33.8.1-33.8.3.
[6]TANAKA T,NISHIHARA M,TAKAHARA T,et al.Experimental demonstration of 448-Gbps+DMTtransmission over 30-km SMF[C]//Optical Fiber Communication Conference.San Francisco,CA:OSA,2014:1-3.
[7]DONG Po,LIU Xiang,SETHUMADHAVAN C,et al.224-Gb/s PDM-16-QAM modulator and receiver based on silicon photonic integrated circuits[C]//Optical Fiber Communication Conference,Washington DC:OSA,2013.
[8]CHAGNON M,OSMAN M,POULIN M,et al.Experimental study of 112 Gb/s short reach transmission employing PAM formats and SiP intensity modulator at1.3μm[J].Opt Express,2014,22(17):21018-21036.
[9]AKIYAMA S,USUKI T.High-speed and efficient silicon modulator based on forward-biased pin diodes[J].Frontiers in Phys,2014,2:65 1-7.
[10]DONG Po,CHEN Long,CHEN Youngkai.Highspeed low-voltage single-drive push-pull silicon MachZehnder modulators[J].Opt Express,2014,20(6):6163-6169.
[11]WANG Zhehui,XU Jiang,YANG Peng,et al.A holistic modelling and analysis of optical-electrical interfaces for inter/intra-chip interconnects[J].IEEETransactions on VLSI,2016,24(7):2462-2474.
[12]TUCKER R S,KOROTKY S K,EISENSTEIN G,et al.16-Gbit/s optical time-division-multiplexed transmission system experiment[J].Zentralblatt Fur Gynakologie,1988,87(39):1314-8.
[13]WANG S,CIFTCIOGLU B,WU Hui.Microringbased optical pulse-train generator[J].Opt Express,2010,18:19314-19323.
[14]WANG S,WU Hui.Experimental demonstration of microring-based optical pulse train generator[J].Opt Express,2011,19:16259-16265.
[15]DUPUIS N,LEE B G,RYLYAKOV A V,et al.Design and fabrication of low-insertion-loss and lowcrosstalk broadband 2×2Mach-Zehnder silicon photonic switches[J].Journal of Lightwave Tech,2015,33(17):3597-3606.
[16]LUO Zhang,YUAN Xiaodong,YE Weimin,et al.Mapping the effective stimulated raman nonlinearity in submicrometer silicon waveguides[J].J Light Technol,2010,28(19):2897-2901.
[17]WEBER M J.Handbook of optical materials[M].Boca Rtaon,Fl:CRC Press,2008.
[18]LEUTHOLD J,KOOS C,FREUDE W.Nonlinear silicon photonics[J].Nat Photonics,2010,4:535-544.
[19]许超龙,李晋文,罗章,等.一种面向光收发器的ps级光脉冲产生器[J].计算机工程与科学,2016,38(1):41-45.XU Chaolong,LI Jinwen,LUO Zhang,et al.A ps level optical pulse generator in optical transceiver[J].Computer Engineering&Science,2016,38(1):41-45.(in Chinese)