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OSNR Monitoring for RZ-DQPSK Systems Using Half-Symbol Delay-Tap Sampling Technique

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5 Author(s)
Khan, F.N. ; Photonics Res. Centre, Hong Kong Polytech. Univ., Kowloon, China ; Lau, A.P.T. ; Zhaohui Li ; Chao Lu
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We propose and experimentally demonstrate an asynchronous half-symbol delay-tap sampling technique for in-band optical signal-to-noise ratio (OSNR) monitoring in 38-Gb/s return-to-zero differential quadrature phase-shift-keying systems. The proposed technique enables simple analytical models for the statistics of a signal pulse which avoids system calibration prior to OSNR monitoring. A monitoring range of 11-23 dB has been demonstrated experimentally. Furthermore, the proposed technique also extends the range of calibration-based OSNR monitoring techniques to 5-34 dB.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 11 )