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Statistical Analysis of Optical Signal-to-Noise Ratio Monitoring Using Delay-Tap Sampling

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5 Author(s)
F. N. Khan ; Photonics Research Centre, Department of Electronic and Information Engineering and the Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong ; Alan Pak Tao Lau ; Zhaohui Li ; Chao Lu
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We derive analytical expressions for the optical signal-to-noise ratio (OSNR) monitoring using delay-tap sampling for intensity-modulated direct-detection (IM/DD) systems. We demonstrate through our theoretical analysis and experimental results that modeling of noise correlation due to low-pass filtering between delay-tap samples enables accurate monitoring of OSNR, without recalibration for each system setup. Effects of chromatic dispersion (CD) and polarization-mode dispersion on the proposed technique are investigated through numerical simulations. The monitoring error remains within ??1 dB for CD up to 400 ps/nm and differential group delay up to 45 ps.

Published in:

IEEE Photonics Technology Letters  (Volume:22 ,  Issue: 3 )