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Fully programmable spectrum sliced chirped microwave photonic filter.
Optics Express
|April 4, 2015
Summary
A new chirped microwave photonic filter (MPF) offers software-controlled tuning and independent amplitude/phase reconfiguration. This advanced optical processor achieves a large radio frequency (RF) chirp and low noise for improved performance.
Area of Science:
- Photonics and Optical Engineering
- Microwave Engineering
- Signal Processing
Background:
- Microwave photonic filters (MPFs) are crucial for advanced signal processing.
- Existing MPFs often face limitations in tunability, RF performance, and noise.
Purpose of the Study:
- To present a novel chirped microwave photonic filter (MPF) with enhanced radio frequency (RF) group delay slope and single passband response.
- To enable full software control and independent reconfiguration of RF amplitude and phase responses.
Main Methods:
- Utilizing a Fourier domain optical processor (FD-OP) and a single sideband modulator.
- Implementing an optimized optical parameter region with large optical bandwidth (>750 GHz) and low slicing dispersion (< ± 1 ps/nm).
Main Results:
- Achieved a large in-band RF chirp of -4.2 ns/GHz.
- Demonstrated center frequency invariant tuning and independent reconfiguration of RF amplitude and phase.
- Exhibited low passband noise performance, measured at <-120 dB/Hz.
Conclusions:
- The novel MPF design based on FD-OP offers significant improvements in RF performance and tunability.
- Software-controlled reconfiguration and low noise characteristics make this MPF suitable for advanced applications.
