Variable rate, multi-format receiver design for 10 to 40 Gb/s DPSK and OOK formats

Area of Science:

• Optical communications engineering
• Digital signal processing

Background:

• Differential phase-shift keying (DPSK) is a modulation technique used in high-speed optical communication systems.
• Existing DPSK demodulators often have limitations in terms of bit-rate flexibility and signal type handling.

Purpose of the Study:

• To develop and demonstrate a continuously-variable bit-rate receiver for DPSK signals.
• To enable the receiver to also demodulate intensity modulated signals without performance degradation.
• To analyze and compare the performance of the new receiver with traditional DPSK demodulators.

Main Methods:

• Implementation of a novel receiver architecture capable of continuous bit-rate adjustment.
• Testing the receiver with both DPSK and intensity modulated waveforms across a range of bit rates (10-40 Gbit/s).
• Characterization of receiver imperfections and comparison with a standard delay-line interferometer.

Main Results:

• Successful demonstration of a continuously-variable bit-rate receiver from 10 to 40 Gbit/s for DPSK demodulation.
• The receiver exhibits undistorted passing of intensity modulated waveforms.
• Analysis quantifies degradations from receiver imperfections, providing a benchmark against traditional DPSK delay-line interferometers.

Conclusions:

• The developed receiver offers enhanced flexibility and performance for optical communication systems.
• This technology advances DPSK demodulation by accommodating variable bit rates and intensity modulation.
• The findings provide valuable insights for the design of next-generation optical receivers.