Generation of phase-coded microwave signals using a polarization-modulator-based photonic microwave phase shifter

Area of Science:

• Photonics
• Microwave Engineering
• Signal Processing

Background:

• Phase-coded microwave signals are crucial for modern communication and radar systems.
• Existing generation methods often face limitations in flexibility, speed, or stability.

Purpose of the Study:

• To propose and demonstrate a novel scheme for generating phase-coded microwave signals.
• To utilize an electrically tunable photonic microwave phase shifter for flexible phase control.

Main Methods:

• The proposed photonic phase shifter is based on a single-sideband polarization modulator (PolM).
• Phase tuning is achieved using a second PolM, controlled by an electrical coding signal.
• Radio frequency (RF) signals are introduced to the first PolM to generate the coded output.

Main Results:

• Successfully generated phase-coded microwave signals with binary and polyphase codes.
• Demonstrated simple and flexible operation of the photonic phase shifter.
• Confirmed high coding rates, a large frequency range, and excellent transmission performance.

Conclusions:

• The demonstrated scheme provides a stable and efficient method for generating phase-coded microwave signals.
• The system's flexibility and performance make it suitable for various advanced microwave applications.
• This photonic approach offers a promising alternative for future signal generation technologies.