Analysis of intrachannel nonlinear effects in highly dispersedoptical pulse transmission

We analyze intrachannel nonlinear effects in high-bit-rate transmission systems based on short optical pulses that are dispersion compensated. We perform an analytical study of a generic example with two pulses, in which case the nonlinearity shifts the pulses in time and results in the generation of leading and trailing pulse echoes. We show that in all the relevant range of parameters, the magnitude of the nonlinear impairments reduces monotonically with the reduction of pulse width and with the increase of the dispersion coefficient     

Study of the two-frequency moment generating function of the PMD vector

We study the properties of the polarization-mode dispersion (PMD) vector as a stochastic process in frequency. An equation for the joint-moment-generating function of PMD at two offset optical frequencies is derived and used to obtain analytical expressions for the conditional first and second moments of PMD. We find Mat the rate at which the PMD vector decorrelates in frequency does not depend on whether its modulus is significantly different from its average value.     

A compensator for the effects of high-order polarization modedispersion in optical fibers

We present a polarization mode dispersion compensator for the rotation of the principal states with frequency. This compensator requires only two control elements more than existing first-order compensators. These are the position of one polarization controller and the setting of a single delay. With the proposed scheme, compensation for first order can be decoupled from the compensation for higher orders and controlled independently. The effect of the compensator on signal transmission is evaluated with extensive numerical simulations