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Degradation of bit-error rate in coherent optical communications due to spectral spread of the transmitter and the local oscillator

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4 Author(s)
Kikuchi, K. ; University of Tokyo, Bunkyo-ku, Tokyo, Japan ; Okoshi, T. ; Nagamatsu, M. ; Henmi, H.

In coherent optical communication schemes, the FM noises of the transmitter and/or the local oscillator seriously deteriorate the receiver sensitivity. A theory is developed describing the effect of the FM noise on the bit-error rate (BER) performance of various heterodyne and homodyne schemes. To verify the theory, the BER of a phase-shift keying (PSK) heterodyne system is measured. The feasibility of the PSK scheme using semiconductor lasers is also discussed on the basis of analysis and experimentation.

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Lightwave Technology, Journal of  (Volume:2 ,  Issue: 6 )