Abstract:
In order to deliver high data rate (content/applications) over the optical networks, higher order
modulation schemes play a key role along with effective coding techniques. Quadrature Amplitude
Modulation (QAM) technique is believed to be one of the vastly used modulation schemes for optical
communication these days. Bandwidth utilization in higher order modulation schemes is more
effective as compared to other modulation schemes. Performance of 128-QAM with dual polarization
for long haul optical communication has been investigated in this paper. Investigation has been carried
out at data rate of 112 Gbits/s for a fiber length of 100 Km. Simulation study enables to visualize
constellation diagram, optical spectrum and optical signal in time domain. Different system
impairments, such as dispersion and attenuation have also been combated by the use of Dispersion
Compensation Fiber (DCF) and amplifiers.
