INVESTIGATION OF DPSK RECEIVER SYSTEM BY USING MICHELSON INTERFEROMETER WITH FARADAY ROTATING MIRROR

Abstract

DPSK (differential phase shift keying) have become an important modulation format because of suitability for next-generation optical fiber communication systems. In this paper, we report the demonstration of a DPSK receiver based on Michelson interferometer (MCI). The MCI configured with Faraday rotator mirror to confirm the reduction in polarization sensitivity. The Faraday rotator mirror serves as a phase conjugate mirror by creating a phase delay of 90 degrees. The performances of the DPSK receiver using MCI and a conventional DPSK receiver Kylia using Mach-Zehnder interferometer (MZI) are compared in terms of signal of bit error rate (BER), polarization fluctuation. According to the experimental results, the DPSK receiver using MCI achieved low distortion, polarization-insensitive as well as wavelength-shift-free operation.