Multi-Carrier Coherent Receiver Based on a Shared Optical Hybrid and a Cyclic AWG Array for Terabit/s Optical Transmission

We describe a multi-carrier coherent-receiver scheme where the coherent beating between an ultra-high-speed multi-carrier signal and multiple optical local oscillators (OLOs) is conducted in a single optical hybrid, followed by carrier separation through an arrayed waveguide grating (AWG) array. Sharing the optical hybrid for multiple OLOs simplifies the coherent receiver complexity and eases the timing alignment among multiple modulated carriers. Based on this scheme, a compact coherent-receiver front end consisting of an integrated 4 × 40 AWG array following a polarization-diversity optical hybrid is demonstrated and used for complete demodulation of a 1.12-Tb/s multi-carrier signal having ten 112-Gb/s polarization-division multiplexed (PDM)-quadrature phase-shift keying (QPSK) carriers spaced at 50 GHz. The required optical signal-to-noise ratio for the 1.12-Tb/s signal is 27 dB at 10-3 bit error ratio. The cyclic feature of the AWG array allows the receiver to receive modulated carriers that are not adjacently spaced. We also extend this receiver scheme for multi-carrier signals whose carriers are closely spaced, e.g., under the orthogonal frequency-division multiplexing (OFDM) condition, for high-spectral-efficiency Terabit/s transmission applications.

[1]  S. Chandrasekhar,et al.  Compact and broadband coherent receiver front-end for complete demodulation of a 1.12-terabit/s multi-carrier PDM-QPSK signal , 2009, 2009 35th European Conference on Optical Communication.

[2]  William Shieh,et al.  Coherent optical OFDM: has its time come? [Invited] , 2008 .

[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]  Kuang-Tsan Wu,et al.  Real-time measurements of a 40 Gb/s coherent system. , 2008, Optics express.

[5]  Seb J Savory,et al.  Digital filters for coherent optical receivers. , 2008, Optics express.

[6]  Sethumadhavan Chandrasekhar,et al.  Self-coherent optical transport systems , 2008 .

[7]  Xiang Liu,et al.  Experimental investigation on the performance of closely spaced multi-carrier PDM-QPSK with digital coherent detection. , 2009, Optics express.

[8]  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.

[9]  E. Yamazaki,et al.  No-Guard-Interval Coherent Optical OFDM for 100-Gb/s Long-Haul WDM Transmission , 2009, Journal of Lightwave Technology.

[10]  B. Zhu,et al.  Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber , 2009, 2009 35th European Conference on Optical Communication.

[11]  Neil Genzlinger A. and Q , 2006 .

[12]  S. Chandrasekhar,et al.  Efficient digital coherent detection of A 1.2-Tb/s 24-carrier no-guard-interval CO-OFDM signal by simultaneously detecting multiple carriers per sampling , 2010, 2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference.

[13]  William Shieh,et al.  1-Tb/s per channel coherent optical OFDM transmission with subwavelength bandwidth access , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[14]  Fred Buchali,et al.  Transmission of 1.2 Tb/s continuous waveband PDM-OFDM-FDM signal with spectral efficiency of 3.3 bit/s/Hz over 400 km of SSMF , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.