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Tunable microwave-photonic filter using frequency-to-time mapping-based delay lines.

Arash Mokhtari, Kambiz Jamshidi, Stefan Preußler

|October 10, 2013

Summary

Researchers developed novel microwave-photonic filters (MPFs) using tunable optical delay lines. This innovation allows for flexible control over the filter

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Area of Science:

Photonics
Microwave Engineering
Signal Processing

Background:

Microwave-photonic filters (MPFs) are crucial for signal processing applications.
Existing MPF designs often lack tunability or are complex to implement.

Purpose of the Study:

To propose and demonstrate a new implementation of MPFs.
To achieve tunable free spectral range (FSR) using optical delay lines.

Main Methods:

Utilized tunable optical delay lines for variable delay implementation.
Mapped spectral components to the time domain, applied phase offsets, and inverse mapped to the frequency domain.
Employed suppressed-carrier single-sideband modulation for linear phase correction.

Main Results:

Successfully demonstrated a two-tap MPF with a variable delay element.
Achieved a tunable FSR, varying from 1.2 GHz to 5.3 GHz (over a factor of four).

Conclusions:

The proposed MPF implementation offers a novel approach to tunable filtering.
The demonstrated tunability of FSR opens possibilities for advanced signal processing.