Abstract
As optical networks continue to grow towards high capacity and high
flexibility, new transmission technologies are being introduced. In order
to maintain the quality of signal and control over network in the transparent
domains, optical performance monitoring (OPM) systems are becoming a necessity.
Phase modulation formats emerge as the solution of choice in transparent domains
because of their sensitivity, spectral efficiency, and resilience to optical
impairments. In this paper, we demonstrate a flexible OPM method for phase-modulated
signals using asynchronous amplitude histogram analysis. We show numerically
and experimentally the monitoring of optical signal-to-noise ratio (OSNR),
chromatic dispersion (CD), and polarization-mode dispersion (PMD) for differential
phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK)
signals. The OSNR can be measured within range of 20–35 dB and accumulated
chromatic dispersion between $-$600 and $+$600
ps/nm. The asynchronous amplitude histogram monitoring method is proved to
be a precise and versatile monitoring tool for high-capacity optical networks.
© 2008 IEEE
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