Filter-Based DPSK Communications System

Differentially encoded phase shift keying (DPSK) is a widely used method in optical signal processing. However, traditional DPSK receivers have been complex and expensive because they need delay-line interferometer-based demodulation and have had limitations in achieving optimal receiver sensitivity, creating significant impact on the overall performance of communication systems. Current approaches using delay-line interferometers increase the complexity and cost of the system while reducing its stability. These systems tend to be large and consume a lot of power. Additionally, their sensitivity and communication performance are not always at the optimum level. Hence, there's a need for a solution that can address these issues, deliver optimal sensitivity, and preserve the communication performance.

Technology Description

A filter-based method to demodulate differentially encoded phase shift keyed (DPSK) optical signals is applicable to both binary-DPSK (DBDPSK) and quadrature DPSK (DQPSK) signals. It combines filtering and differential phase comparison to enhance the receiver's sensitivity. Significantly, this innovative approach overrides the need for delay-line interferometer-based demodulation, thus reducing the complexity and cost of DPSK receivers. The uniqueness of this technology lies in its ability to reduce the DPSK receiver's size, weight, and power, while improving stability. Despite these reductions, the method maintains the capability to achieve exceptional communication performance. Therefore, it sets itself apart by ensuring optimal receiver sensitivity, which significantly contributes to improving the efficiency and effectiveness of optical communication systems.