Abstract

Recently, degree of polarization (DOP) of light has been utilized as a parameter to monitor optical signal-to-noise-ratio (OSNR). However, in the presence of polarization-mode dispersion (PMD), when using DOP to determine OSNR, OSNR is always underestimated due to the depolarization effect induced by PMD. In this paper, we propose and experimentally demonstrate a simple PMD-insensitive OSNR monitoring technique based on DOP measurement. By the assistance of the transmitter-side polarization scrambling, the in-service OSNR parameter can be accurately derived from the measured maximum DOP value within the polarization scrambling period, which is immune to PMD effect. The monitoring performance is experimentally evaluated by statistical method at OSNR of 25 dB. Experimental results show that OSNR monitoring with about 1-dB standard deviation can be achieved in a 10-Gb/s NRZ-OOK system with DGD varying from 0 to 80 ps.

© 2006 Optical Society of America

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References

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  1. Alan Eli Willner, S.M.R. Motaghian Nezam, Lianshan Yan, Zhongqi Pan, Michelle C. Hauer, "Monitoring and control of polarization-related impairments in optical fiber systems," IEEE J. Lightwave Technol. 22, 106-125 (2004).
    [CrossRef]
  2. D. C. Kilper, "Optical performance monitoring," IEEE J. of Lightwave Technol. 22, 294-304 (2004).
    [CrossRef]
  3. C.Y. Joun, K.J. Park, J.H. Lee, and Y.C. Chung, "OSNR monitoring technique based on orthogonal delayed-homodyne method," IEEE Photon. Technol. Lett. 14, 1467-1471 (2002).
  4. Man-Hong Cheung, Lian-Kuan Chen, Chun-Kit Chan, "A PMD-insensitive OSNR monitoring scheme based on polarization-nulling with off-center narrowband filtering," in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2004), paper FF2.
  5. J.H. Lee, D.K. Jung, C.H. Kim, and Y.C. Chung, "OSNR monitoring technique using polarization-nulling method," IEEE Photon. Technol. Lett. 13, 88-90 (2001).
    [CrossRef]
  6. Mats Petersson, Henrik Sunnerud, Magnus Karlsson, and Bengt-Erik Olsson, "Performance monitoring in optical networks using stokes parameters," IEEE Photon. Technol. Lett. 16, 686-688 (2004).
    [CrossRef]
  7. Mats Petersson, Henrik Sunnerud, Bengt-Erik Olsson, and Magus Karlsson, "Optical performance monitoring using degree of polarization in presence of polarization-mode dispersion," in Proceedings of European Conference on Optical Communication, paper Tu3.6.2 (2004).
  8. Chongjin Xie, Daniel C. Kilper, "Influence of polarization scattering on polarization-assisted OSNR monitoring in dense WDM systems with NZ-DSF and Raman Amplification", in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2005), paper JWA40.
  9. Mats Skold, Bengt-Erik Olsson, Henrik Sunnerud, and Magnus Karlsson, "PMD-insensitive DOP-based OSNR monitoring by spectral SOP measurements," in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2005), paper OThH3.

European Conference on Optical Communica

Mats Petersson, Henrik Sunnerud, Bengt-Erik Olsson, and Magus Karlsson, "Optical performance monitoring using degree of polarization in presence of polarization-mode dispersion," in Proceedings of European Conference on Optical Communication, paper Tu3.6.2 (2004).

IEEE J. Lightwave Technol.

Alan Eli Willner, S.M.R. Motaghian Nezam, Lianshan Yan, Zhongqi Pan, Michelle C. Hauer, "Monitoring and control of polarization-related impairments in optical fiber systems," IEEE J. Lightwave Technol. 22, 106-125 (2004).
[CrossRef]

IEEE J. of Lightwave Technol.

D. C. Kilper, "Optical performance monitoring," IEEE J. of Lightwave Technol. 22, 294-304 (2004).
[CrossRef]

IEEE Photon. Technol. Lett.

C.Y. Joun, K.J. Park, J.H. Lee, and Y.C. Chung, "OSNR monitoring technique based on orthogonal delayed-homodyne method," IEEE Photon. Technol. Lett. 14, 1467-1471 (2002).

J.H. Lee, D.K. Jung, C.H. Kim, and Y.C. Chung, "OSNR monitoring technique using polarization-nulling method," IEEE Photon. Technol. Lett. 13, 88-90 (2001).
[CrossRef]

Mats Petersson, Henrik Sunnerud, Magnus Karlsson, and Bengt-Erik Olsson, "Performance monitoring in optical networks using stokes parameters," IEEE Photon. Technol. Lett. 16, 686-688 (2004).
[CrossRef]

Optical Fiber Communication Conference

Chongjin Xie, Daniel C. Kilper, "Influence of polarization scattering on polarization-assisted OSNR monitoring in dense WDM systems with NZ-DSF and Raman Amplification", in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2005), paper JWA40.

Mats Skold, Bengt-Erik Olsson, Henrik Sunnerud, and Magnus Karlsson, "PMD-insensitive DOP-based OSNR monitoring by spectral SOP measurements," in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2005), paper OThH3.

Man-Hong Cheung, Lian-Kuan Chen, Chun-Kit Chan, "A PMD-insensitive OSNR monitoring scheme based on polarization-nulling with off-center narrowband filtering," in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, Washington DC, 2004), paper FF2.

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Figures (4)

Fig. 1.
Fig. 1.

Experimental configuration for the proposed PMD-insensitive DOP-based OSNR monitoring scheme.

Fig. 2.
Fig. 2.

Histograms for the measured OSNR data with DGD of (a)(d) 10 ps, (b)(e) 40 ps, and (c)(f) 70 ps by the conventional DOP-based method (left) and the proposed DOP-based method (right).

Fig. 3.
Fig. 3.

The measured OSNR by the proposed method (●) and the conventional method (■) with DGD varying from 0 to 80 ps. The measured OSNR values were illustrated by the estimation mean with error bars.

Fig. 4.
Fig. 4.

The measured OSNR by the proposed method under different OSNR conditions with DGD varying from 0 to 80 ps.

Equations (2)

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DOP = DOP OSNR × DOP PMD
OSNR ( dB 0.1 nm ) = 10 log [ ( DOP max 1 DOP max ) ( NEB f 0.1 ) ]

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