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Power Profile Optimization in Phase-Modulated Systems in Presence of Nonlinear Phase Noise

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2 Author(s)
Lau, A.P.T. ; Dept. of Electr. Eng., Stanford Univ., CA ; Kahn, J.M.

In optical fiber transmission systems using inline amplifiers, the interaction of signal and amplifier noise through the Kerr effect leads to nonlinear (NL) phase noise that impairs detection of phase-modulated signals. We study the minimization of the total phase noise variance (linear, NL, and receiver) by using a power profile along the link that is linear (on a decibel scale) with distance. For DPSK systems with direct detection, a total variance reduction of 65% can be achieved by designing the transmitted power to be about 8 dB higher than the received power in typical terrestrial links. In addition, for a given transmitted power and received power, the optimal power profile along the link is numerically determined

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 23 )

Date of Publication:

Dec.1, 2006

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