Title :
Single-Channel 400-Gb/s OTDM-32 RZ/QAM Coherent Transmission Over 225 km Using an Optical Phase-Locked Loop Technique
Author :
Kasai, Keisuke ; Omiya, Tatsunori ; Guan, Pengyu ; Yoshida, Masato ; Hirooka, Toshihiko ; Nakazawa, Masataka
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
4/15/2010 12:00:00 AM
Abstract :
A single-channel 400-Gb/s transmission with a polarization-multiplexed , 10-Gsymbol/s, four-optical time-division multiplexed (OTDM) 32 return-to-zero/quadrature amplitude modulation (RZ/QAM) scheme is demonstrated for the first time. By using an optical phase-locked loop technique and a clock recovery circuit, we have successfully obtained a very stable pulsed-local oscillator whose phase was locked to the transmitter, and achieved precise demultiplexing and demodulation simultaneously. As a result, 400-Gb/s data were transmitted over 225 km with a bit-error-rate performance below the forward-error correction limit. Furthermore, we also realized a 320-Gb/s to 450-km transmission with an OTDM 16 RZ/QAM scheme.
Keywords :
demodulation; demultiplexing; optical modulation; optical phase locked loops; phase locked oscillators; quadrature amplitude modulation; time division multiplexing; bit rate 320 Gbit/s; bit rate 400 Gbit/s; bit-error-rate performance; clock recovery circuit; demodulation; demultiplexing; distance 450 km; forward-error correction limit; four-optical time-division multiplexing; optical phase-locked loop technique; pulsed-local oscillator; return-to-zero-quadrature amplitude modulation scheme; single-channel OTDM-32 RZ-QAM coherent transmission; transmitter; Coherent transmission; optical phase-locked loop (OPLL); optical time-division multiplexing (OTDM); polarization-multiplexing (PM); quadrature amplitude modulation (QAM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2042708
