Abstract

<p><a href="http://www.osa-jon.org/features/OPM_2004.html">Feature Issue on Optical Performance Monitoring (OPM)</a></p> A new technique for monitoring the signal-to-noise ratio (SNR) of a randomly modulated optical data signal is proposed and demonstrated. The signal is detected and then subjected to a narrowband rf demodulation at precisely half the data clock frequency. Because of symmetries present in the modulation spectrum at the half-clock frequency, the demodulated signal is confined to a single dimension in the recovered phase space. In contrast, the noise power is distributed isotropically within the phase space, and the SNR is measured by taking the ratio of the power recovered along the signal dimension to the power recovered along the orthogonal dimension. The narrowband nature of the measurement makes it highly sensitive. The technique is demonstrated for return-to-zero modulated data at 10 Gbits/s, where it accurately tracks OSNR variations from 10 to 26 dB with only -24 dBm of optical input. The measurement is also shown to be sensitive to chromatic dispersion and can be made to track OSNR variations in the presence of large amounts of chromatic dispersion with vestigial sideband optical filtering. These properties make this technique an ideal candidate for optical performance monitoring in transparent optical networks, where a sensitive, low-cost monitoring solution is needed for effective fault localization.

© 2003 Optical Society of America

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  1. M. Teshima, M. Koga, and K. Sato, "Performance of multiwavelength simultaneous monitoring circuit employing arrayed-wave-guide grating," J. Lightwave Technol. 14, 2277-2285 (1996).
  2. K. Asahi, M. Yamashita, T. Hosoi, K. Nakaya, and C. Konoshi, "Optical performance monitor built into EDFA repeaters for WDM networks," in Optical Fiber Communication Conference (OFC '98) (Optical Society of America, Washington, D.C., 1998), paper ThO2.
  3. H. Suzuki and N. Takachio, "Optical signal quality monitor built into WDM linear repeaters using semiconductor arrayed waveguide grating filter monolithically integrated with eight photodiodes," Electron. Lett. 35, 836-837 (1999).
  4. D. C. Kilper, S. Chandrasekhar, L. Buhl, A. Agarwal, and D. Maywar, "Spectral monitoring of OSNR in high-speed networks," in 28th European Conference on Optical Communication (IEEE, Piscataway, New Jersey, 2002), paper 7.4.4.
  5. A. Richter, W. Fischler, H. Bock, and R. Bach, "Optical performance monitoring in transparent and configurable DWDM networks," IEE Proc. Optoelectron. 149, 1-5 (2002).
  6. I. Shake, H. Takara, K. Uchiyama, and Y. Yamabayashi, "Quality monitoring of optical signals influenced by chromatic dispersion in a transmission fiber using averaged Q-factor evaluation," IEEE Photon. Technol. Lett. 13, 385-387 (2001).
  7. S. Ohteru and N. Takachio, "Optical signal quality monitor using direct Q-factor measurement," IEEE Photon. Techol. Lett. 11, 1307-1309 (1999).
  8. W. G. Yang, "Sensitivity issues of optical performance monitoring," IEEE Photon. Technol. Lett. 14, 107-109 (2002).
  9. H. R. Stuart, "Signal-to-noise ratio monitoring of optical data using narrowband analysis at the half-clock frequency," in Optical Fiber Communication Conference (OFC '03), Vol. 86 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), paper WP5.
  10. W. M. Siebert, Circuits, Signals, and Systems (MIT Press, Cambridge, Mass, 1986).
  11. F. M. Gardner, Phaselock Techniques, 2nd ed. (Wiley, New York, 1979).
  12. H. Schmuck, "Comparison of optical millimeter-wave system concepts with regard to chromatic dispersion," Electron. Lett. 31, 1848-1849 (1995).
  13. G. Smith, D. Novak, and Z. Ahmed, "Overcoming chromatic-dispersion effects in fiber-wireless systems incorporating external modulators," IEEE Trans. Microwave Theory Tech. 45, 1410-1415 (1997).

ECOC 2002 (1)

D. C. Kilper, S. Chandrasekhar, L. Buhl, A. Agarwal, and D. Maywar, "Spectral monitoring of OSNR in high-speed networks," in 28th European Conference on Optical Communication (IEEE, Piscataway, New Jersey, 2002), paper 7.4.4.

Electron. Lett. (2)

H. Schmuck, "Comparison of optical millimeter-wave system concepts with regard to chromatic dispersion," Electron. Lett. 31, 1848-1849 (1995).

H. Suzuki and N. Takachio, "Optical signal quality monitor built into WDM linear repeaters using semiconductor arrayed waveguide grating filter monolithically integrated with eight photodiodes," Electron. Lett. 35, 836-837 (1999).

IEE Proc. Optoelectron. (1)

A. Richter, W. Fischler, H. Bock, and R. Bach, "Optical performance monitoring in transparent and configurable DWDM networks," IEE Proc. Optoelectron. 149, 1-5 (2002).

IEEE Photon. Technol. Lett. (2)

I. Shake, H. Takara, K. Uchiyama, and Y. Yamabayashi, "Quality monitoring of optical signals influenced by chromatic dispersion in a transmission fiber using averaged Q-factor evaluation," IEEE Photon. Technol. Lett. 13, 385-387 (2001).

W. G. Yang, "Sensitivity issues of optical performance monitoring," IEEE Photon. Technol. Lett. 14, 107-109 (2002).

IEEE Photon. Techol. Lett. (1)

S. Ohteru and N. Takachio, "Optical signal quality monitor using direct Q-factor measurement," IEEE Photon. Techol. Lett. 11, 1307-1309 (1999).

IEEE Trans. Microwave Theory Tech. (1)

G. Smith, D. Novak, and Z. Ahmed, "Overcoming chromatic-dispersion effects in fiber-wireless systems incorporating external modulators," IEEE Trans. Microwave Theory Tech. 45, 1410-1415 (1997).

J. Lightwave Technol. (1)

M. Teshima, M. Koga, and K. Sato, "Performance of multiwavelength simultaneous monitoring circuit employing arrayed-wave-guide grating," J. Lightwave Technol. 14, 2277-2285 (1996).

OFC 1998 (1)

K. Asahi, M. Yamashita, T. Hosoi, K. Nakaya, and C. Konoshi, "Optical performance monitor built into EDFA repeaters for WDM networks," in Optical Fiber Communication Conference (OFC '98) (Optical Society of America, Washington, D.C., 1998), paper ThO2.

OFC 2003 (1)

H. R. Stuart, "Signal-to-noise ratio monitoring of optical data using narrowband analysis at the half-clock frequency," in Optical Fiber Communication Conference (OFC '03), Vol. 86 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), paper WP5.

Other (2)

W. M. Siebert, Circuits, Signals, and Systems (MIT Press, Cambridge, Mass, 1986).

F. M. Gardner, Phaselock Techniques, 2nd ed. (Wiley, New York, 1979).

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