Homodyne receiver prototype with time-switching phase diversity and feedforward analog processing.

Area of Science:

• Optoelectronics
• Optical Communications
• Signal Processing

Background:

• Homodyne optical receivers are crucial for high-sensitivity optical communication.
• Traditional designs often rely on 90-degree optical hybrids, which can be complex and costly.
• Phase noise is a significant challenge in optical receiver performance.

Purpose of the Study:

• To experimentally demonstrate a differential phase shift keying (DPSK) homodyne optical receiver.
• To achieve this without the need for a 90-degree optical hybrid.
• To evaluate the receiver's tolerance to phase noise and implementation feasibility.

Main Methods:

• Experimental demonstration of a DPSK homodyne optical receiver.
• Utilized time-switching phase diversity technique.
• Employed off-the-shelf electrical and optical components.

Main Results:

• Successful experimental demonstration of the proposed receiver architecture.
• Achieved high tolerance to phase noise.
• Confirmed feasible implementation using readily available components.

Conclusions:

• The demonstrated time-switching phase diversity technique offers a viable alternative to traditional 90-degree optical hybrids in homodyne receivers.
• This approach simplifies receiver design and enhances robustness against phase noise.
• The findings support the practical application of this receiver in future optical communication systems.