Photonic approach to flexible multi-band linearly frequency modulated microwave signals generation

Area of Science:

• Photonics
• Electrical Engineering
• Signal Processing

Background:

• Linearly frequency modulated (LFM) signals are crucial in radar and communication systems.
• Existing LFM signal generators often lack flexibility in multi-band operation.

Purpose of the Study:

• To propose and experimentally demonstrate a flexible multi-band LFM signal generator.
• To leverage dual-polarization binary phase-shift keying (DP-BPSK) modulation for advanced signal synthesis.

Main Methods:

• A DP-BPSK modulator is employed, driven by a local oscillator (LO) and an LFM signal.
• Phase difference control via a polarization controller enables multi-band LFM signal generation.
• Phase modulation of the LO signal suppresses self-heterodyne interference.

Main Results:

• Successful generation of flexible multi-band LFM signals was experimentally verified.
• The proposed method allows for adjustable signal characteristics through phase control.
• Self-heterodyne effects were effectively mitigated, enhancing signal quality.

Conclusions:

• The demonstrated DP-BPSK based LFM signal generator offers significant flexibility for multi-band applications.
• This approach provides a viable solution for high-quality, adaptable LFM signal generation.
• Further research can explore optimization for specific communication and radar systems.