Abstract

The digital coherent receiver, which is a combination of a phase-diversity optical homodyne receiver and digital signal processing (DSP), can demodulate any multilevel coded optical signals without relying upon an optical phase-locked loop. However, the maximum symbol rate processed by such a receiver is limited by the speed of electric analog-to-digital converters and digital signal processors. Although real-time operation at 10 Gsymbol/s using an application-specific integrated circuit has recently been demonstrated, it is still difficult to increase the symbol rate beyond 40 Gsymbol/s. In order to cope with this difficulty, we propose a novel scheme, which employs a local oscillator (LO) pulsed at the subharmonic frequency of the symbol rate, enabling time-division demultiplexing of the signal at the digital coherent receiver. We demonstrate that the new type of digital coherent receiver operating at 10 Gsymbol/s can demodulate the aggregate symbol rate of 160 Gsymbol/s. From these results, we can expect ultrafast coherent optical fiber communication in the future.

© 2009 IEEE

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References

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  1. T. Okoshi, K. Kikuchi, Coherent Optical Fiber Communications (Kluwer, 1988).
  2. R. Noé, "Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery," J. Lightw. Technol. 23, 802-808 (2005).
  3. S. Tsukamoto, K. Katoh, K. Kikuchi, "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," IEEE Photon. Technol. Lett. 18, 1016-1018 (2006).
  4. S. J. Savory, "Digital filters for coherent optical receivers," Opt. Expr. 16, 804-817 (2008).
  5. K. Kikuchi, "Electronic post-compensation for nonlinear phase fluctuations in a 1000-km 20-Gbit/s optical quadrature phase-shift keying transmission system using the digital coherent receiver," Opt. Expr. 16, 889-896 (2008).
  6. H. Sun, K. T. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent system," Opt. Express 16, 873-879 (2008).
  7. T. Pfau, S. Hoffmann, O. Adamczyk, R. Peveling, V. Herath, M. Porrmann, R. Noé, "Coherent optical communication: Towards realtime systems at 40 Gbit/s and beyond," Opt. Expr. 16, 866-872 (2008).
  8. A. Leven, N. Kaneda, Y. K. Chen, "A real-time CMA-based 10 Gb/s polarization demultiplexing coherent receiver implemented in an FPGA," Opt. Fiber Commu. Conf. OFC 2008 (2008).
  9. K. Kikuchi, K. Igarashi, Y. Mori, C. Zhang, "Demodulation of 320-Gbit/s optical quadrature phase-shift keying signal with digital coherent receiver having time-division demultiplexing function," Opt. Fiber Commu. Conf. OFC 2008 (2008).
  10. C. Zhang, Y. Mori, K. Igarashi, K. Kikuchi, "Demodulation of 640-Gbit/s polarization-multiplexed OTDM QPSK signals using a digital coherent receiver," Opt. Fiber Commu. Conf., OFC 2008 (2008).
  11. C. Zhang, Y. Mori, K. Igarashi, K. Katoh, K. Kikuchi, "Demodulation of 480-Gbit/s 8 PSK OTDM Signal with digital coherent receiver," Proc. Eur. Conf. Opt. Commu., ECOC 2008 (2008).
  12. F. Ito, "Interfrometric demultiplexing experiment using linear coherent correlation with modulated local oscillator," Electron. Lett. 32, 14-15 (1996).
  13. F. Ito, "Demultiplexed detection of ultrafast optical signal usinginterferometric cross-correlation technique," J. Lightw. Technol. 15, 930-937 (1997).
  14. S. Tsukamoto, D.-S. Ly-Gagnon, K. Katoh, K. Kikuchi, "Coherent demodulation of 40-Gbitls polarization-multiplexed QPSK signals with 16-GHz spacing after 200-km transmission," Proc. Opt. Fiber Commu. Conf., OFC 2005 (2005).
  15. S. Haykin, Adaptive Filter Theory (Prentice Hall, 2001).
  16. R. Noé, "PLL-free synchronous QPSK receiver concept with digital I&Q balanced processing," Eur. Conf. Opt. Commun., ECOC 2004 (2004).
  17. D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation," J. Lightw. Technol. 24, 12-21 (2006).
  18. K. Igarashi, K. Katoh, K. Kikuchi, K. Imai, M. Kourogi, "Generation of 10-GHz 2-ps optical pulse train over the C band based on an optical comb generator and its application to 160-Gbit/s OTDM systems," Proc. Eur. Conf. Opt. Commu., ECOC 2008 (2008).

2008 (4)

S. J. Savory, "Digital filters for coherent optical receivers," Opt. Expr. 16, 804-817 (2008).

K. Kikuchi, "Electronic post-compensation for nonlinear phase fluctuations in a 1000-km 20-Gbit/s optical quadrature phase-shift keying transmission system using the digital coherent receiver," Opt. Expr. 16, 889-896 (2008).

H. Sun, K. T. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent system," Opt. Express 16, 873-879 (2008).

T. Pfau, S. Hoffmann, O. Adamczyk, R. Peveling, V. Herath, M. Porrmann, R. Noé, "Coherent optical communication: Towards realtime systems at 40 Gbit/s and beyond," Opt. Expr. 16, 866-872 (2008).

2006 (2)

S. Tsukamoto, K. Katoh, K. Kikuchi, "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," IEEE Photon. Technol. Lett. 18, 1016-1018 (2006).

D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation," J. Lightw. Technol. 24, 12-21 (2006).

2005 (1)

R. Noé, "Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery," J. Lightw. Technol. 23, 802-808 (2005).

1997 (1)

F. Ito, "Demultiplexed detection of ultrafast optical signal usinginterferometric cross-correlation technique," J. Lightw. Technol. 15, 930-937 (1997).

1996 (1)

F. Ito, "Interfrometric demultiplexing experiment using linear coherent correlation with modulated local oscillator," Electron. Lett. 32, 14-15 (1996).

Electron. Lett. (1)

F. Ito, "Interfrometric demultiplexing experiment using linear coherent correlation with modulated local oscillator," Electron. Lett. 32, 14-15 (1996).

IEEE Photon. Technol. Lett. (1)

S. Tsukamoto, K. Katoh, K. Kikuchi, "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," IEEE Photon. Technol. Lett. 18, 1016-1018 (2006).

J. Lightw. Technol. (3)

F. Ito, "Demultiplexed detection of ultrafast optical signal usinginterferometric cross-correlation technique," J. Lightw. Technol. 15, 930-937 (1997).

R. Noé, "Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery," J. Lightw. Technol. 23, 802-808 (2005).

D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation," J. Lightw. Technol. 24, 12-21 (2006).

Opt. Expr. (1)

T. Pfau, S. Hoffmann, O. Adamczyk, R. Peveling, V. Herath, M. Porrmann, R. Noé, "Coherent optical communication: Towards realtime systems at 40 Gbit/s and beyond," Opt. Expr. 16, 866-872 (2008).

Opt. Expr. (2)

S. J. Savory, "Digital filters for coherent optical receivers," Opt. Expr. 16, 804-817 (2008).

K. Kikuchi, "Electronic post-compensation for nonlinear phase fluctuations in a 1000-km 20-Gbit/s optical quadrature phase-shift keying transmission system using the digital coherent receiver," Opt. Expr. 16, 889-896 (2008).

Opt. Express (1)

Other (9)

A. Leven, N. Kaneda, Y. K. Chen, "A real-time CMA-based 10 Gb/s polarization demultiplexing coherent receiver implemented in an FPGA," Opt. Fiber Commu. Conf. OFC 2008 (2008).

K. Kikuchi, K. Igarashi, Y. Mori, C. Zhang, "Demodulation of 320-Gbit/s optical quadrature phase-shift keying signal with digital coherent receiver having time-division demultiplexing function," Opt. Fiber Commu. Conf. OFC 2008 (2008).

C. Zhang, Y. Mori, K. Igarashi, K. Kikuchi, "Demodulation of 640-Gbit/s polarization-multiplexed OTDM QPSK signals using a digital coherent receiver," Opt. Fiber Commu. Conf., OFC 2008 (2008).

C. Zhang, Y. Mori, K. Igarashi, K. Katoh, K. Kikuchi, "Demodulation of 480-Gbit/s 8 PSK OTDM Signal with digital coherent receiver," Proc. Eur. Conf. Opt. Commu., ECOC 2008 (2008).

K. Igarashi, K. Katoh, K. Kikuchi, K. Imai, M. Kourogi, "Generation of 10-GHz 2-ps optical pulse train over the C band based on an optical comb generator and its application to 160-Gbit/s OTDM systems," Proc. Eur. Conf. Opt. Commu., ECOC 2008 (2008).

T. Okoshi, K. Kikuchi, Coherent Optical Fiber Communications (Kluwer, 1988).

S. Tsukamoto, D.-S. Ly-Gagnon, K. Katoh, K. Kikuchi, "Coherent demodulation of 40-Gbitls polarization-multiplexed QPSK signals with 16-GHz spacing after 200-km transmission," Proc. Opt. Fiber Commu. Conf., OFC 2005 (2005).

S. Haykin, Adaptive Filter Theory (Prentice Hall, 2001).

R. Noé, "PLL-free synchronous QPSK receiver concept with digital I&Q balanced processing," Eur. Conf. Opt. Commun., ECOC 2004 (2004).

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