Two Means of Compensating Fiber Nonlinearity Using Optical Phase Conjugation

The growing demand of higher capacity over longer transmission distances has seen fiber nonlinearity as a major limiting factor in modern optical transmission systems [1, 2]. Among the methods under investigation, nonlinearity compensation using optical phase conjugation (OPC) has emerged as an effective means of suppressing the nonlinear impairments [3, 4, 5]. This paper shall discuss two types of fiber arrangement with respect to the OPC, as shown in Fig.1. In one type of arrangement, the fiber parameters and the signal intensity are in scaled mirror symmetry about the OPC. While the other type is characterized by scaled translational symmetry.