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Microwave photonic notch filter based on a dual-Sagnac-loop structure
Xudong Wang1, Erwin H W Chan, Robert A Minasian
1School of Electrical and Information Engineering, Institute of Photonics and Optical Science, University of Sydney, New South Wales, 2006, Australia. xudong@ee.usyd.edu.au
Applied Optics
|November 25, 2010
Summary
A novel microwave photonic notch filter uses a dual-Sagnac-loop structure for coherence-free operation. This new design achieves a narrow notch, flat passband, and high attenuation, enabling high-frequency applications.
Area of Science:
- Photonics
- Microwave Engineering
- Optical Filters
Background:
- Microwave photonic filters are crucial for signal processing.
- Existing filters often face limitations in coherence, bandwidth, or frequency range.
Purpose of the Study:
- To introduce a new single-wavelength, coherence-free microwave photonic notch filter.
- To demonstrate a novel dual-Sagnac-loop structure for enhanced filter performance.
Main Methods:
- Utilizing a dual-Sagnac-loop structure with differing free spectral ranges.
- Generating noncommensurate taps through the loop design.
- Experimental validation of the proposed filter concept.
Main Results:
- Achieved a narrow notch response with a flat passband.
- Demonstrated high stop-band attenuation exceeding 40dB.
- Confirmed the filter's capability for high-frequency operation.
Conclusions:
- The proposed dual-Sagnac-loop microwave photonic notch filter offers superior performance.
- The coherence-free design enables versatile applications in high-frequency signal processing.
- This technology presents a significant advancement in optical filter design.
