Single-Channel 400-Gb/s OTDM-32 RZ/QAM Coherent Transmission Over 225 km Using an Optical Phase-Locked Loop Technique

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.

[1]  Masataka Nakazawa,et al.  Performance improvement of an acetylene (C2H2) frequency-stabilized fiber laser , 2006, IEICE Electron. Express.

[2]  K. Kikuchi,et al.  Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation , 2006, IEEE Photonics Technology Letters.

[3]  Yojiro Mori,et al.  Demodulation of 1.28-Tbit/s polarization-multiplexed 16-QAM signals on a single carrier with digital coherent receiver , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[4]  H. Weber,et al.  320 Gbit/s clock recovery with electro-optical PLL using a bidirectionally operated electroabsorption modulator as phase comparator , 2003, OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005..

[5]  A. Gnauck,et al.  112-Gb/s polarization-multiplexed 16-QAM on a 25-GHz WDM grid , 2008, 2008 34th European Conference on Optical Communication.

[6]  Fumihiko Ito.  Interferometric demultiplexing experiment using linear coherent correlation with modulated local oscillator , 1996 .

[7]  Yojiro Mori,et al.  Straight-line 1,073-km transmission of 640-Gbit/s dual-polarization QPSK signals on a single carrier , 2009, 2009 35th European Conference on Optical Communication.

[8]  Colja Schubert,et al.  160 Gbit/s clock recovery with electro-optical PLL using bidirectionally operated electroabsorption modulator as phase comparator , 2003 .

[9]  Masataka Nakazawa.  Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency , 2008, 2008 34th European Conference on Optical Communication.

[10]  L. Molle,et al.  Generation and coherent time-division demultiplexing of up to 5.1 Tb/s single-channel 8-PSK and 16-QAM signals , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[11]  M. Nakazawa,et al.  64 and 128 coherent QAM optical transmission over 150 km using frequency-stabilized laser and heterodyne PLL detection. , 2008, Optics express.

[12]  T. Sakamoto,et al.  Asymptotic formalism for ultraflat optical frequency comb generation using a Mach-Zehnder modulator. , 2007, Optics letters.