Advanced Digital Optical Communications, 2nd Edition

6

Differential Phase Shift Keying Photonic Systems

This chapter investigates differential phase shift keying (DPSK) modulation for noncoherent transmission and detection optical communications systems. The differential mode of detection is most appropriate for such systems in which the phases contained in the two consecutive bit periods are assigned discrete values, for example, 0, π or 0, π/2, π and 3π/2. An experimental demonstration of DPSK modulation formats is also described.

6.1 Introduction

Owing to the tremendous growing demand for high-capacity transmission over the Internet, a high data rate of 40 Gbps per channel is an attractive feature of the next generation of lightwave communications system. Under the current 10 Gbps DWDM optical ...