Dynamic Polarization Mode Dispersion Compensation Research Articles

Dynamic PMD compensation in 4×10Gb/s optical time-division multiplexed transmission system

Using the degree of polarization as feedback signal to detect the polarization m ode dispersion (PMD) variation in the fiber links, an experiment of dynamic adap tive PMD compensation in 4×10?Gb/s optical time-division multiplexed (OTDM) tr ansmission system is reported. The PMD compensator consists of a polarization co ntroller and a variable delay line with four degrees of freedom. Based on the va riable step-size peek search algorithm, the performance of the PMD compensator i s assessed in the eye pattern of a received signal. It is shown that the maximum compensated differential group delay is 25?ps, i.e. one bit period, and the co mpensation time can be less than 50?ms.

Design and simulations of a dynamic polarization-mode dispersion compensator for long-haul optical networks

A new technique and apparatus design for compensation of first-, second-, and higher-order polarization-mode dispersion (PMD) is proposed. Rigorous simulations show that the effects of the high-PMD long-haul fiber are dynamically mitigated or minimized and that the data are recovered from the distorted signals. The technique uses a real-time signal-monitoring and feedback method in the design of the PMD compensator that consists of a combination of polarization-based optical components. The resulting apparatus will enhance the transmission quality, extend the reach of current high-bit-rate (OC-192) optical signal transport, and enable the next-generation ultrahigh-bit-rate optical signals (OC-768 and beyond). The module and method provide a dynamically reconfigurable functional control to mitigate the influence of high-PMD fiber on high-bit-rate optical data. It can be packaged into a box or board/card or with other functional blocks (MUX/DEMUX, optical amplifiers, and the like) at the optical network nodes.