This paper provides an overview of Differential Quadrature Phase Shift Keying (DQPSK) Modulation in fiber optic communication along with simulation design and modelling of its transmitter.

In this paper, Quadrature Phase Shift Keying (QPSK) modulation and demodulation system based on a Substrate Integrated Waveguide (SIW) is designed and implemented for high-speed data transmission. The ...

3. Phase Modulation (PM) is a modulation technique used in communication systems where the phase of the carrier signal is varied in proportion to the amplitude of the modulating signal. Unlike ...

We propose a novel orthogonal modulation format with differential phase-shift keying (DPSK) and code-shift keying (CSK) to improve transmission capacity of the optical code-based communication system.