Performance Evaluation of Full Adder Using Mach–Zehnder Interferometer and Polarization Effect on WDM Channels

Abstract

The optical communication system has many advantages over the long distance communication and fast switching. The requirements of data transmission for communication are increasing day by day. But the bandwidth is limited for transmission. In this thesis, two types of techniques are discussed for transmitting the data from transmitter to receiver. Firstly Mach–Zehnder Interferometric devices for optical processing which is used as a wavelength-spacing tunable comb filter in a fiber ring laser is built by employing an optical variable delay line (OVDL). Semiconductor optical amplifier (SOA)-based Mach–Zehnder interferometer (MZI) and Optical tree architecture (OTA), both play an important role in optical interconnecting networks. In this thesis the proposed SOA-MZIbased tree architecture is used with new and alternative scheme, for integrated all-optical logic and arithmetic operations. In this architecture the continuous wave laser source and control signal are passes through the coupler. The pulsed signal at the wavelength is split at coupler and more power passes through one arm. At the same time, the CW signal at wavelength is split equally by this coupler and propagates simultaneously in the two arms. This architecture can enable to perform all-optical processing of signals, like half-adder, full-adder, etc. Secondly in optical communication data can be transmitting into the fiber by different techniques. In the proposed architecture the data is send by wave division multiplexing techniques from transmitting end and the effect of polarization seen on channel spacing is 50 GHz and they are generated in groups by odd and even channels by PRBS generator. Initially all channels have the same polarization state. All even channels before being multiplexed with odd channels are passed through the Polarization Shifter, which rotates the polarization state by different angle. After multiplexing the signal is launched into a fiber, and then is de-multiplexed and sent to 8 receivers. At the receiving end measured BER is minimum and Q-factor is maximum for 90 degree state of polarization.