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Maximum-likelihood optimal-sampling-phase estimation for ultra-high-sensitivity optically preamplified duobinary receivers

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5 Author(s)
Moller, L. ; Lucent Technol., Bell Labs., Holmdel, NJ, USA ; Chongjin Xie ; Ryf, R. ; Xiang Liu
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This paper describes the demonstration of a novel method for detecting optical duobinary signals. Oversampling in combination with maximum-likelihood estimation-based data processing of the optical-to-electronic converted signal results in a record sensitivity for an optically preamplified receiver. The concept is investigated at 10 Gb/s and allows data recovery at bit-error rates of 1/spl times/10/sup -9/ and 1/spl times/10/sup -3/ with a receiver sensitivity of better than -39.5 dBm and an optical signal-to-noise ratio (OSNR) of only 7.8 dB, respectively.

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Lightwave Technology, Journal of  (Volume:23 ,  Issue: 1 )