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Experimental investigation of the performance limitation of DPSK systems due to nonlinear phase noise

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2 Author(s)
Hoon Kim ; Lucent Technol. Bell Labs, Holmdel, NJ, USA ; Gnauck, A.H.

It is known that amplitude fluctuations caused by amplified spontaneous emission noise can be converted into phase noise by Kerr nonlinearity, and this nonlinear phase noise can limit the performance of phase-shift-keying transmission systems. In this letter, we experimentally observe and study the performance degradation of differential phase-shift-keying transmission systems due to nonlinear phase noise. In order to clearly observe the effect, we intentionally add ASE noise to the DPSK signal at the transmitter, and then transmit the signal over a 600-km nonzero dispersion-shifted fiber (NZDSF) link. The results show that the probability density function of nonlinear phase noise deviates from the Gaussian distribution, and this characteristic negates the benefit of a balanced receiver.

Published in:

Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 2 )