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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 6 — Mar. 15, 2009
  • pp: 731–743

Optical Signal-to-Noise Ratio Estimation Using Reference Asynchronous Histograms

Ruben S. Luís, António Teixeira, and Paulo Monteiro

Journal of Lightwave Technology, Vol. 27, Issue 6, pp. 731-743 (2009)


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Abstract

This paper presents and experimentally demonstrates a novel method for the estimation of optical signal-to-noise ratio (OSNR) based on the comparison of an asynchronous histogram of the signal under analysis with a reference asynchronous histogram. The latter is acquired from the signal under analysis at a calibration stage. The proposed method allows the use of optical amplification to increase the sensitivity of the optical monitoring system (OMS) by a factor 20 dB, when using an erbium doped fiber preamplifier. In addition, the use of a semiconductor optical preamplifier, initially designed for nonlinear operation at 2.5 Gb/s is used in the OMS to preamplify 40-Gb/s signals, achieving a sensitivity gain of 10 dB. It will be experimentally demonstrated that the proposed method is applicable to 40-Gb/s nonreturn to zero (NRZ) signals arbitrarily degraded by group velocity dispersion (GVD). Furthermore, accurate monitoring of the OSNR of return-to-zero (RZ) signals will also be possible using a simple RZ-to-NRZ converter based on narrow-band optical filtering within the OMS. The proposed method also allows estimating of the GVD-induced OSNR penalty between the signal under analysis and the signal at the calibration stage.

© 2009 IEEE

Citation
Ruben S. Luís, António Teixeira, and Paulo Monteiro, "Optical Signal-to-Noise Ratio Estimation Using Reference Asynchronous Histograms," J. Lightwave Technol. 27, 731-743 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-6-731


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