PMD monitoring with the interference of CD and OSNR using delay-tap sampling

Abstract

ABSTRACT Our study proposes a method of monitoring polarization mode dispersion (PMD) under the influence of chromatic dispersion (CD) and optical signal-to-noise-ratio (OSNR) in the two-dimensional phase diagram, using delay sampling by two-dimensional phase diagram. The result shows that PMD at range of 5ps/ km to 37ps/ can be effectively monitored from the interference of CD and OSNR. Keywords: Fiber optics communication, Two-dimensional phase diagram, Delay sampling, PMD monitoring 1. INTRODUCTION It is well known that, as a kind of transmission impairment to the digital optical communication system, the polarization mode dispersion (PMD) will broad signal pulse, which will increase the bit error rate (BER) and decrease the transmission bandwidth to the digital optical communication system. In the past, the PMD monitoring technology is mainly confined within the frequency domain. Due to the non-sensitive of the optical filter to signals in radio frequency spectrum, many CD and PMD monitoring methods using frequency domain analysis are presented [1-3]. However, methods in time domain are still rare. In the time domain, the OSNR and CD can be monitored using the delay sampling technology [4], but there is no proposals on monitoring PMD using the delay sampling technology. The neural network is also used to monitor multiple transmission impairments simultaneously, but the accuracy remains to be improved [5]. Two-dimensional phase diagram based on time domain sampling is a new method to monitor multiple impairments [6], and in this work, we monitor PMD using two-dimensional phase diagram on signals impaired by CD and OSNR.