Performance investigation of suppression of four wave mixing using optical phase conjugation with different modulation format in DWDM soliton communication system
G. Kaur+, R. S. Kaler+, S. Singh*
+Optical Fiber Communication Research Laboratory (OFCR Lab), ECE Department, Thapar University, Patiala,
147004 Punjab, India
*Department of Electronics and Communication Engineering, Punjabi University, Patiala, 147004 Punjab, India
Abstract
In this paper, the performance of dense
wavelength division multiplexed (DWDM) soliton
transmission system for return-to-zero (RZ) and
non-return-to-zero (NRZ) modulation
formats have been investigated. The main aim of
this paper is to estimate and mitigate the
four wave mixing (FWM) power by using in-line
optical phase conjugator (OPC). The effect
of FWM has been estimated using real fiber link
having non-linear and attenuation losses. The
FWM power is strongly suppressed by introducing
destructive interference between the first
and second halves of in-line OPC. It has been
indicated that RZ with OPC yields the better
performance with FWM power suppression (more than
20 dBm in certain cases) with
reasonable bit error rate and Q-factor.