REVIEW ON OPTICAL FIBER COMMUNICAITONS WITH MULTIPLEXING TECHNIQUES FOR BETTER PERFORMANCE
Optical fiber communications plays significant role in the communication era. In order to improve the communication capacity of the optical fiber communication system multiplexing technology is widely used. Single core optical fiber generally uses dense wave length multiplexing (DWDM) techniques for optical amplification system that can contribute the transmission capacity of about 1Tb/s (=1000Gbit/s).In addition to this, in Single core fibers, Polarization division multiplexing (PDM) is implementedthat uses QPSK system which can withhold a transmission capacity of about 10Tbit/s. Higher order Quadrature amplitude modulation (QAM) such as 64 QAM and 128QAM, are also applied in optical systems that can achieve capacity up to 100Tbit/s.As the requirement for capacity is increased beyond 100Tbit/s, it is observed various limitations in the optical transmission medium and transmission system such as limited spectral efficiency and limited optical power. In order to overcome this limitation space division multiplexing (SDM) has been proposed as a high-capacity optical transmission technology that can overcome the physical limitations of conventional single-mode optical fiber. This paper provides a review of different Optical fiber communication techniques.
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