Abstract:
Over the recent years, the need for high capacity and high broadband wireless
access were in demand and in order to satisfy it various technologies were intro duced among which RoF came into existence which has low attenuation, immunity to
electromagnetic interference and superior signal integrity. Therefore, it enables the
transmission of signal over long distance and thus improves the capacity and mobility
of the optical transmission system. In this review, we would concentrate on analyz ing the effect of fiber nonlinearity such as Four wave mixing (FWM) effect in long
haul transmission system. Basically, FWM is an impairment due to the interaction
of field intensity with the fiber refractive index which results in signal broadening,
undesirable signal modulation and attenuation and thereby limiting the transmission
capability of long-haul system. A parametric analysis for reducing the power level
of crosstalk generated by FWM by incorporating various optical components in the
communication link is done and optimization based on channel spacing, input power,
fiber length, bitrate, is performed.
This article discusses the nonlinear effect, four-wave mixing (FWM), which lowers
the performance of optical communication systems. The concept of Linear polariza tion was introduced to reduce the effects of FWM. Here, orthogonal polarization is
used with the modulation technique NRZ. Linear polarization was found to reduce
the effect of FWM more than round polarization. Weaknesses of the four wavelength
mixes were analyzed for various levels of input power. The capacity of a four-wave
mixing product (FWM) is assessed by an optical spectrum analyzer. System perfor mance is analyzed in terms of quality factors and BER.
