OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 26 — Dec. 22, 2008
  • pp: 21647–21655

Adaptive threshold adjustment for signal-distortion-free digital-coherent optical demodulation system

Akito Chiba, Takahide Sakamoto, and Tetsuya Kawanishi  »View Author Affiliations


Optics Express, Vol. 16, Issue 26, pp. 21647-21655 (2008)
http://dx.doi.org/10.1364/OE.16.021647


View Full Text Article

Enhanced HTML    Acrobat PDF (1015 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Optical quadrature amplitude modulation (QAM) attracts considerable attention in the enhancement of communications capacity, due to its high spectral efficiency. However, this modulation format is more sensitive to signal distortion than conventional formats, making it more difficult to create, transmit, and detect signals. In this paper, we propose an adaptive scheme for demodulation of the distorted optical signals with paying attention to use of DSP-technology. The scheme is based on the adjustment of the thresholds against the signal distortion. Successful demodulation of optical QAM signals is demonstrated with a sufficiently low bit-error rate.

© 2008 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 4, 2008
Revised Manuscript: November 19, 2008
Manuscript Accepted: November 23, 2008
Published: December 16, 2008

Citation
Akito Chiba, Takahide Sakamoto, and Tetsuya Kawanishi, "Adaptive threshold adjustment for signaldistortion- free digital-coherent optical demodulation system," Opt. Express 16, 21647-21655 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-26-21647


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, "20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilized laser," Electron. Lett. 42, 57-58 (2006).
  2. N. Kikuchi, K. Mandai, K. Sekine, and S. Sasaki, "First experimental demonstration of single-polarization 50-Gbit/s 32-level (QASK and 8-DPSK) incoherent optical multilevel transmission," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper PDP21. [PubMed]
  3. M. Nakazawa, J. Hongou, K. Kasai, and M. Yoshida, "Polarization-multiplexed 1 Gsymbols/s, 64 QAM (12Gbit/s) coherent optical transmission over 150km with an optical bandwidth of 2 GHz," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper PDP26. [PubMed]
  4. Y. Kamio, M. Nakamura, and T. Miyazaki, "Pre-equalization for 10 Gsymbol/s 16-QAM in a vector modulator," in Proceedings of IEEE/LEOS summer topical meetings (IEEE, 2008), paper MC1.2.
  5. M. Nakamura, Y. Kamio, and T. Miyazaki, "Real-time 40-Gbit/s 16-QAM self-homodyne using a polarizing-multiplexed pilot-carrier," in Proceedings of IEEE/LEOS summer topical meetings (IEEE, 2008), paper WC2.3.
  6. M. Seimetz, "Laser linewidth limitations for optical systems with high-order modulation employing feed forward digital carrier phase estimation," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2008) paper OTuM2.
  7. K. Kasai, M. Yoshida and M. Nakazawa, "Optical Phase-locked Loop for Coherent Transmission over 500 km," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper JWA49. [PubMed]
  8. A. P. T. Lau and J. M. Kahn, "Signal design and detection in presence of nonlinear phase noise," J. Lightwave Technol. 25, 3008-3016 (2007). [CrossRef]
  9. M. S. Alfiad, D. van den Borne, F. N. Hauske, A. Napoli, B. Lankl, A. M. J. Koonen, and H. de Waardt, "Dispersion tolerant 21.4-Gb/s DQPSK using simplified Gaussian Joint-Symbol MLSE," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2008), paper OthO3.
  10. M. G. Taylor, "Coherent detection for optical communications using digital signal processing," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper OMP1. [PubMed]
  11. D. -S. Ly-Gagnon, K. Katoh, and K. Kikuchi, "Unrepeatered optical transmission of 20 Gbit/s quadrature phase-shift keying signals over 210km using homodyne phase-diversity receiver and digital signal processing," Electron. Lett. 41, 206-207 (2005). [CrossRef]
  12. H. Noguchi, N. Yoshida, H. Uchida, M. Ozaki, S. Kanemitsu, and S. Wada, "A 40Gb/s CDR with adaptive decision-point control using eye-opening monitor feedback," in Proceedings of IEEE International Conference on Solid-State Circuits, ISSCC2008 (Institute of Electrical and Electronics Engineers, San Francisco, 2008), pp. 228-229.
  13. A. Chiba, T. Sakamoto, and T. Kawanishi, "Adaptive symbol discrimination method for distorted multilevel optical signal and its application to decoding of high-speed optical quadrature amplitude modulation," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2008) paper JWA63. [PubMed]
  14. A. Chiba, T. Sakamoto, and T. Kawanishi, "Simple, low fluctuation voltage signal generation for 8-Gb/s quadrature amplitude modulation using dual-parallel Mach-Zehnder modulator," IEICE Elect. Express 5, 497-502 (2008). [CrossRef]
  15. T. Sakamoto, A. Chiba and T. Kawanishi, "50Gb/s 16 QAM by a quad-parallel Mach-Zehnder modulator," in Proceedings of ECOC2007 (Berlin, German, 2007), paper PD2.8.

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited