Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 10.6 bit/s/Hz.

We report a polarization-multiplexed 320 Gbaud, 64 QAM coherent Nyquist pulse transmission with a frequency-stabilized mode-locked laser and a modified digital back-propagation method for pulse transmission. Using a combination consisting of a mode-locked laser and a pulse shaper, we obtained a Nyquist pulse with a high OSNR of 51 dB. We achieved error free operation under a back-to-back condition with the OSNR improvement. By developing a new digital back-propagation method for pulse propagation, we achieved a bit error rate below the 7% forward error correction limit of 2x10-3 for all the tributaries of the OTDM signal data after a 150 km transmission. As a result, single-channel 3.84 Tbit/s data were successfully transmitted over 150 km with a spectral efficiency of 10.6 bit/s/Hz.

[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]  Masataka Nakazawa,et al.  Optical phase-locked loop for coherent transmission over 500km using heterodyne detection with fiber lasers , 2007, IEICE Electron. Express.

[3]  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..

[4]  Hung Nguyen Tan,et al.  Seamless spectral defragmentation of Nyquist OTDM-WDM signals in add-drop node for all-optical elastic network , 2013 .

[5]  M. Nakazawa,et al.  Ultrastable harmonically and regeneratively modelocked polarisation-maintaining erbium fibre ring laser , 1994 .

[6]  M. Nakazawa,et al.  Single-Channel 1.92 Tbit/s, 64 QAM Coherent Nyquist Orthogonal TDM Transmission With a Spectral Efficiency of 10.6 Bit/s/Hz , 2016, Journal of Lightwave Technology.

[7]  Harry Nyquist.  Certain Topics in Telegraph Transmission Theory , 1928 .

[8]  Hao Zhou,et al.  Highly programmable wavelength selective switch based on liquid crystal on silicon switching elements , 2006, 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference.

[9]  M. Nakazawa,et al.  A single-channel 1.92 Tbit/s, 64 QAM coherent optical pulse transmission over 150 km using frequency-domain equalization. , 2013, Optics express.

[10]  Munehiko Nagatani,et al.  Single-carrier 1-Tb/s PDM-16QAM transmission using high-speed InP MUX-DACs and an integrated OTDM modulator. , 2015, Optics express.

[11]  Masataka Nakazawa,et al.  High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality. , 2014, Optics express.

[12]  Eiji Yoshida,et al.  Coherence Degradation in the Process of Supercontinuum Generation in an Optical Fiber , 1998 .

[13]  Masataka Nakazawa,et al.  The use of a Nyquist filter for reducing an optical signal bandwidth in a coherent QAM optical transmission , 2008, IEICE Electron. Express.

[14]  Masataka Nakazawa,et al.  Ultrahigh-speed "orthogonal" TDM transmission with an optical Nyquist pulse train. , 2012, Optics express.

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

[16]  K. Kasai,et al.  Mode-Hop-Free, Optical Frequency Tunable 40-GHz Mode-Locked Fiber Laser , 2007, IEEE Journal of Quantum Electronics.

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

[18]  Thomas Richter,et al.  Generation and Coherent Reception of 107-GBd Optical Nyquist BPSK, QPSK, and 16QAM , 2014, IEEE Photonics Technology Letters.

[19]  Masataka Nakazawa,et al.  640 Gbaud (1.28 Tbit/s/ch) optical Nyquist pulse transmission over 525 km with substantial PMD tolerance. , 2013, Optics express.

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

[21]  Masataka Nakazawa,et al.  Novel RZ-CW conversion scheme for ultra multi-level, high-speed coherent OTDM transmission , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[22]  K. Kasai,et al.  Single-Channel 400-Gb/s OTDM-32 RZ/QAM Coherent Transmission Over 225 km Using an Optical Phase-Locked Loop Technique , 2010, IEEE Photonics Technology Letters.