PERFORMANCE OF A CPDM-QPSK COHERENT HOMODYNE OPTICAL TRANSMISSION SYSTEM DUE TO CROSS POLARIZATION EFFECTS
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DEPARTMENT OF ELECTRICAL, ELECTRONIC AND COMMUNICATION ENGINEERING
Abstract
An analytical development on a Circular Polarization Division Multiplexing (CPDM)
Quadrature Phase Shift Keying (QPSK) based optical transmission system with coherent
homodyne detection is carried out in order to maximize the spectral efficiency of Fiber
Optic transceivers by assessing the Bit Error Rate (BER) performance of the system
considering the crosstalk induced by cross-polarization (XPol). Considering Maxwell-
Boltzman distribution for the probability distribution function (pdf) of the misalignment
angle, the average BER is derived. This analysis is extended to find the BER and Signal to
Crosstalk plus Noise Ratio (SCNR) considering the power penalty due to different mean
misalignment angle. Results show that the system suffers significant deterioration in BER
performance and power penalty due to XPol-induced crosstalk. Penalty in signal power is
found to be 6.43, 16.78, 31.99 and 76.99 dB for mean misalignment angle of 20, 30, 40 and
60 degree respectively. CPDM inherently operates QPSK to increase the bit rate within the
same spectral width of the transmitter. So, the outcome of this research can be an effective
candidate to upgrade the design of the existing optical polarization diversity PDM coherent
transmission systems.
Description
We are highly grateful and indebted to our supervisor, Dr. Satya Prasad Majumder,
Professor, Department of Electrical Electronic Engineering, Bangladesh University of
Engineering & Technology (BUET), for his continuous guidance, supervision,
encouragement and untiring support throughout this work.
Additionally, we would like to express our sincere thanks to all other Teachers and staffs of
the Department of Electrical, Electronic & Communication Engineering, Military Institute
of Science & Technology (MIST) for their co-operation and help in the successful
completion of this work.
Our thanks would also go to our beloved family for their prayer, encouragement and
support to achieve our goals.