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Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing

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3 Author(s)
Tsukamoto, S. ; Res. Center for Adv. Sci. & Technol., Univ. of Tokyo ; Katoh, K. ; Kikuchi, K.

We demonstrate coherent demodulation of optical multilevel (M-ary) phase-shift-keying (PSK) signals. Since the carrier phase is estimated accurately through digital signal processing after phase-diversity homodyne detection, the system performance is highly tolerant to the carrier phase noise. By off-line bit-error-rate measurements using distributed feedback semiconductor lasers with linewidths of 150 kHz as a transmitter and a local oscillator, it is shown that binary PSK (M=2), quadrature PSK (M=4), and eight-PSK (M=8) signals are successfully demodulated at the symbol rate of 10 Gsymbol/s

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 10 )