RF signal detection by a tunable optoelectronic oscillator based on a PS-FBG

Area of Science:

• Optoelectronics
• Signal Processing
• Photonics

Background:

• Low-power radio frequency (RF) signal detection is crucial for wireless communication and radar.
• Existing methods face challenges in sensitivity and frequency estimation accuracy.
• Optoelectronic oscillators (OEOs) offer potential for high-performance signal detection.

Purpose of the Study:

• To propose and experimentally demonstrate a tunable optoelectronic oscillator (OEO) for sensitive low-power RF signal detection.
• To investigate the OEO's capability for simultaneous frequency estimation of detected RF signals.
• To analyze the OEO system's performance with varying RF signal modulation rates.

Main Methods:

• A tunable OEO incorporating a phase-shifted fiber Bragg grating was designed and implemented.
• The OEO's response to input RF signals was analyzed by matching RF frequency to OEO oscillation modes.
• Laser source wavelength scanning was employed for simultaneous RF signal frequency estimation.

Main Results:

• The OEO successfully detected low-power RF signals in the 1.5 to 5 GHz range down to -91 dBm.
• A signal gain of approximately 10 dB was achieved during detection.
• RF signal frequency was estimated with a mean error of ±100 MHz.

Conclusions:

• The demonstrated tunable OEO provides a sensitive and accurate method for low-power RF signal detection.
• The system enables simultaneous frequency estimation, enhancing its utility in RF applications.
• The OEO shows promise for applications requiring high-performance RF signal detection and analysis.