论文信息 - First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal

First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal

We demonstrate the add/drop operation and transmission of 120Gbit/s (10 Gsymbol/s) polarization-multiplexed (PDM) 64 QAM digital coherent signals in a deployed ROADM network. By equalizing waveform distortions at the ROADM node with an FIR filter, the QAM signal was successfully add/drop-multiplexed, and transmitted over a 50 km ring network testbed with neighboring 9 × 10Gbit/s OOK WDM data. This indicates the applicability of digital coherent systems to the deployed ROADM network based on 10Gbit/s OOK, and its upgradability to 120Gbit/s PDM64 QAM.

[1] M. Nakazawa,et al. 2048 QAM (66 Gbit/s) single-carrier coherent optical transmission over 150 km with a potential SE of 15.3 bit/s/Hz , 2014, OFC 2014.

[2] B. Zhu,et al. Coded PDM-OFDM Transmission With Shaped 256-Iterative-Polar-Modulation Achieving 11.15-b/s/Hz Intrachannel Spectral Efficiency and 800-km Reach , 2013, Journal of Lightwave Technology.

[3] Hiroaki Harai,et al. Development of optical packet and circuit integrated ring network testbed. , 2011, Optics express.

[4] Shogo Yamanaka,et al. Fast optical channel recovery in field demonstration of 100-Gbit/s Ethernet over OTN using real-time DSP. , 2011, Optics express.

[5] Masataka Nakazawa,et al. Adaptive 4~64 QAM real-time coherent optical transmission over 320 km with FPGA-based transmitter and receiver. , 2014, Optics express.

[6] Masataka Nakazawa,et al. 120 Gbit/s injection-locked homodyne coherent transmission of polarization-multiplexed 64 QAM signals over 150 km. , 2014, Optics express.