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Tunable photonic microwave notch filter using SOA-based single-longitudinal mode, dual-wavelength laser
Kwanil Lee1, Ju Han Lee, Sang Bae Lee
1Photonics Research Laboratory, Division of Intelligent System, Korea Institute of Science and Technology, Seoul 130-791, Republic of Korea. klee21@kist.re.kr
Optics Express
|August 6, 2009
Summary
Researchers developed a tunable photonic microwave notch filter using a fiber laser and dispersive fiber. This novel device offers flexible frequency tuning for microwave signals, achieving over 30 dB notch rejection.
Area of Science:
- Photonics
- Microwave Engineering
- Optical Signal Processing
Background:
- Photonic microwave filters are crucial for signal processing.
- Existing filters often lack tunability or have limited frequency ranges.
- Fiber Bragg gratings (FBGs) offer versatile optical filtering capabilities.
Purpose of the Study:
- To propose and demonstrate a novel, frequency-tunable photonic microwave notch filter.
- To achieve flexible control over the notch frequency for microwave signals.
- To leverage FBG-based lasers for tunable microwave filtering.
Main Methods:
- Utilizing a fiber Bragg grating (FBG)-based, single longitudinal mode, dual-wavelength fiber laser.
- Implementing a symmetrical S-bending technique on FBGs to tune laser wavelength spacing.
- Employing a dispersive fiber delay line to generate the microwave notch filter.
- Experimentally validating the filter's performance and tunability.
Main Results:
- Demonstrated a photonic microwave notch filter with frequency tuning capability.
- Achieved notch rejection exceeding 30 dB.
- Showcased flexible tunability of the notch frequency across the 1.2 to 6.7 GHz range.
- Confirmed the effectiveness of the S-bending technique for wavelength spacing control.
Conclusions:
- The proposed FBG-based photonic microwave notch filter provides effective and tunable microwave filtering.
- The S-bending technique offers a practical method for achieving frequency agility in photonic microwave devices.
- This technology has potential applications in reconfigurable microwave systems and wireless communications.
