Real-Time 2.5 GS/s Coherent Optical Receiver for 53.3-Gb/s Sub-Banded OFDM

A real-time receiver for the coherent optical orthogonal frequency-division multiplexing (CO-OFDM) detection is realized in a field-programmable gate array (FPGA). Each building block of the CO-OFDM receiver, such as symbol synchronization, channel estimation, and phase estimation is described and discussed in respect of special technical requirements of real-time implementation. The real-time receiver is successfully demonstrated with a receiver sampling rate of 2.5-Gsamples/s to receive a subband of 53.3-Gb/s multiband CO-OFDM signal. The measured bit error rate (BER) is as low as 3.7 × 10-8 which is a record in real-time or offline CO-OFDM demonstration.

[1]  S. Jansen,et al.  121.9-Gb/s PDM-OFDM Transmission With 2-b/s/Hz Spectral Efficiency Over 1000 km of SSMF , 2009, Journal of Lightwave Technology.

[2]  M.G. Taylor,et al.  Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments , 2004, IEEE Photonics Technology Letters.

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

[4]  R. Noe,et al.  Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery , 2005, Journal of Lightwave Technology.

[5]  Arthur James Lowery,et al.  Orthogonal-frequency-division multiplexing for dispersion compensation of long-haul optical systems. , 2006, Optics express.

[6]  D. Sandel,et al.  Coherent Digital Polarization Diversity Receiver for Real-Time Polarization-Multiplexed QPSK Transmission at 2.8 Gb/s , 2007, IEEE Photonics Technology Letters.

[7]  A. Leven,et al.  Frequency Estimation in Intradyne Reception , 2007, IEEE Photonics Technology Letters.

[8]  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.

[9]  Leonid G. Kazovsky,et al.  Phase- and polarization-diversity coherent optical techniques , 1989 .

[10]  William Shieh,et al.  Coherent optical orthogonal frequency division multiplexing , 2006 .

[11]  A. Leven,et al.  Coherent Polarization-Division-Multiplexed QPSK Receiver With Fractionally Spaced CMA for PMD Compensation , 2009, IEEE Photonics Technology Letters.

[12]  Noriaki Kaneda,et al.  Block length effect on 5.0 Gbit/s real-time QPSK intradyne receivers with standard DFB laser , 2007 .

[13]  W. Shieh,et al.  Experimental Demonstration and Numerical Simulation of 107-Gb/s High Spectral Efficiency Coherent Optical OFDM , 2009, Journal of Lightwave Technology.

[14]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

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

[16]  W. Shieh,et al.  Demonstration of frequency-domain averaging based channel estimation for 40-Gb/s CO-OFDM with high PMD , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

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

[18]  F. Derr,et al.  Coherent optical QPSK intradyne system: concept and digital receiver realization , 1992 .

[19]  Noriaki Kaneda,et al.  A real-time CMA-based 10 Gb/s polarization demultiplexing coherent receiver implemented in an FPGA , 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

[20]  I. Morita,et al.  Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF , 2008, Journal of Lightwave Technology.

[21]  Andrew J. Viterbi,et al.  Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission , 1983, IEEE Trans. Inf. Theory.

[22]  E. Yamazaki,et al.  13.4-Tb/s (134 × 111-Gb/s/ch) no-guard-interval coherent OFDM transmission over 3,600 km of SMF with 19-ps average PMD , 2008, 2008 34th European Conference on Optical Communication.

[23]  W. Shieh,et al.  Multi-gigabit real-time coherent optical OFDM receiver , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[24]  F. Buchali,et al.  Improved nonlinear tolerance of 112-Gb/s PDM-OFDM in dispersion-uncompensated transmission with efficient channel estimation , 2008, 2008 34th European Conference on Optical Communication.

[25]  William Shieh,et al.  Real-time coherent optical OFDM receiver at 2.5-GS/s for receiving a 54-Gb/s multi-band signal , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.