256-QAM Interleaved Single Carrier FDM for Short-Reach Optical Interconnects

In this letter, we experimentally demonstrated a 40-Gbit/s 256-quadrature amplitude modulation (256-QAM) interleaved single-carrier frequency-division multiplexing (I-SC-FDM) over 10-km standard single-mode fiber (SSMF) for optical interconnects. I-SC-FDM has lower peak-to-average power ratio and lower computational complexity of transmitter compared with orthogonal frequency division multiplex- ing (OFDM). High-level QAM can achieve high spectral efficiency; however, it is susceptible to both linear and nonlinear distortions. The frequency-domain one-tap equalizer and the time-domain decision-feedback equalizer with recursive least square and Volterra algorithm are jointly employed to eliminate the distortions for the 256-QAM I-SC-FDM. After 10-km SSMF, I-SC-FDM has better performance than localized SC-FDM and OFDM. Therefore, I-SC-FDM shows the potential for short-reach optical interconnects.

[1]  Shie Mannor,et al.  The kernel recursive least-squares algorithm , 2004, IEEE Transactions on Signal Processing.

[2]  Christian Neumeyr,et al.  Single-VCSEL 100-Gb/s short-reach system using discrete multi-tone modulation and direct detection , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[3]  Preben E. Mogensen,et al.  OFDMA vs. SC-FDMA: performance comparison in local area imt-a scenarios , 2008, IEEE Wireless Communications.

[4]  M. Nishihara,et al.  Experimental comparison of pulse amplitude modulation (PAM) and discrete multi-tone (DMT) for short-reach 400-Gbps data communication , 2013 .

[5]  Preben Mogensen,et al.  Aalborg Universitet OFDMA vs . SC-FDMA Performance Comparison in Local Area IMTA Scenarios , 2010 .

[6]  Yaojun Qiao,et al.  Coherent Optical Interleaved SC-FDM Uplink Scheme for Long-Reach Passive Optical Network , 2016, IEEE Photonics Journal.

[7]  Tao Gui,et al.  Experimental study of PAM-4, CAP-16, and DMT for 100 Gb/s short reach optical transmission systems. , 2015, Optics express.

[8]  Qixiang Cheng,et al.  400 Gigabit Ethernet using advanced modulation formats: Performance, complexity, and power dissipation , 2015, IEEE Communications Magazine.

[9]  Preben E. Mogensen,et al.  Initial Performance Evaluation of DFT-Spread OFDM Based SC-FDMA for UTRA LTE Uplink , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[10]  D.J. Goodman,et al.  Single carrier FDMA for uplink wireless transmission , 2006, IEEE Vehicular Technology Magazine.

[11]  Masataka Nakazawa,et al.  400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE. , 2013, Optics express.

[12]  D. George,et al.  An Adaptive Decision Feedback Equalizer , 1971 .

[13]  H. Griesser,et al.  40 Gb/s lane rate NG-PON using electrical/optical duobinary, PAM-4 and low complex equalizations , 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

[14]  Xinying Li,et al.  Experimental Demonstration of Four-Channel WDM 560 Gbit/s 128QAM-DMT Using IM/DD for 2-km Optical Interconnect , 2017, Journal of Lightwave Technology.

[15]  Lin Chen,et al.  Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser. , 2014, Optics express.

[16]  Qixiang Cheng,et al.  Interleaved single-carrier frequency-division multiplexing for optical interconnects. , 2017, Optics express.