Compensation Characteristics of the Distorted WDM Signals Depending on the Variation Degree of RDPS Random Variables in the Optical Links with Dispersion Management and Optical Phase Conjugation

Abstract

The effects of the variation degree of residual dispersion per span (RDPS) random variables on the compensation characteristics of the distorted signals in optical links with the dispersion management (DM) and the mid-way optical phase conjugator (OPC) are investigated in this paper. In order to obtain this goal, the effective launch power range and the effective net residual dispersion (NRD) range are induced as a function of the variation degree of RDPS random variables. We confirm that it is needed to select the RDPS random variables of the narrow deviation in each fiber spans for implementing the flexible opticallinks transmitting the relative higher launch power. Also, we confirmed that it is more advantageous to use postcompensation rather than precompensation for expanding the effective NRD range.

Electronics, Communications and Networks V

“…The schemes rely on the fact that the phase of the IFWM-induced ghost pulse has a fixed relationship to the phases of the genuine 0's in the bit stream that enter the IFWM process. However, this will introduce an overhead; (5) Optical phase conjugation (OPC) [26][27][28][29], which allows nonlinearity cancellation, provided that the system's power profile and dispersion are symmetrical with respect to midspan. However, for a random bit stream, no phase modulation format can achieve destructive interference in several consecutive time slots; (4) Using constrained codes (also known as modulation codes or line codes) [20][21][22][23][24][25] in which the data are coded in such a way that the worst sequences, such as a 0 bit surrounded by many 1's, are simply avoided by bit stuffing.…”