16 x 125 Gb/s Quasi-Nyquist DAC-Generated PM-16QAM Transmission Over 3590 km of PSCF

被引:9
|
作者
Cigliutti, Roberto [1 ]
Nespola, Antonino [2 ]
Zeolla, Dario [2 ]
Bosco, Gabriella [1 ]
Carena, Andrea [1 ]
Curri, Vittorio [1 ]
Forghieri, Fabrizio [3 ]
Yamamoto, Yoshinori [4 ]
Sasaki, Takashi [4 ]
Poggiolini, Pierluigi [1 ]
机构
[1] Politecn Torino, Dipartimento Elettron & Telecomunicaz, I-10129 Turin, Italy
[2] Ist Super Mario Boella, I-10138 Turin, Italy
[3] Cisco Photon Italy Srl, I-20052 Monza, Italy
[4] Sumitomo Elect Ind, Yokohama, Kanagawa 2448588, Japan
关键词
Coherent detection; Nyquist-WDM; optical communications; quadrature amplitude modulation (QAM); wavelength division multiplexing (WDM);
D O I
10.1109/LPT.2012.2223551
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report on a transmission experiment over high-performance pure silica core fiber (PSCF) of 16 Nyquist wavelength-division-multiplexed (Nyquist-WDM) channels at a symbol rate of 15.625 GBaud, using polarization-multiplexed (PM) 16 symbols quadrature amplitude modulation (16QAM), resulting in a per-channel raw bit rate of 125 Gb/s. The channel spacing is 16 GHz, corresponding to 1.024 times the symbol rate. The interchannel crosstalk penalty is drastically reduced through the confinement of the signal spectrum within a near-Nyquist bandwidth, achieved with digital filtering and digital-to-analog converters (DACs) operating at 1.5 samples/symbol. The optical line is a recirculating loop composed of two spans of high-performance PSCF with erbium-doped fiber amplifiers only. The transmission distance of 3590 km at a target line bit-error rate (BER) of 1.5 x 10(-2) is achieved at a raw spectral efficiency (SE) of 7.81 b/s/Hz. Assuming a commercial hard forward error correction with 20.5% redundancy, capable of handling the target BER, the net SE is 6.48 b/s/Hz, the highest so far reported for multithousand kilometer transmission of PM-16QAM at >= 100 Gb/s per channel. These results demonstrate the feasibility of very high SE DAC-enabled ultra-long-haul quasi-Nyquist-WDM transmission using PM-16QAM with current technologies and manageable digital signal processing complexity.
引用
收藏
页码:2143 / 2146
页数:4
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