In optical communication system, generally the pseudorandom bit sequence (PRBS) are used as data signals for modulating the DWDM channels. The longer word length (WL) develops the more bit patterns in PRBS. The selection of number of bits in PRBS directly affects the system performance because longer the WL means easy to evaluate the performance, on the other hand, shorter the WL means condense the calculation time and the memory requirements. Therefore, it is essential to illuminate how long the WL is vital to estimate the nonlinear crosstalk’s precisely.
The SRS crosstalk can be increased due to the presence of successive number of “1” bits, which is directly proportional to the WL as it determines the maximum possible length of the successive ‘1’ bits. That means longer the WL, maximum the probability of occurrence in successive “1s”.