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Photonic microwave time delay using slow- and fast-light effects in optically injected semiconductor lasers
Optics Letters
|September 29, 2017
Summary
This study introduces a photonic method for microwave time delay using semiconductor lasers. This approach offers tunable time delays up to 80 ps with preserved data quality, enhancing microwave signal processing.
Area of Science:
- Photonics
- Semiconductor Lasers
- Microwave Engineering
Background:
- Microwave time delay is crucial for signal processing.
- Existing methods for tunable time delay face limitations.
Purpose of the Study:
- To investigate a novel photonic approach for tunable microwave time delay.
- To leverage laser cavity resonance shifts for phase manipulation of microwave signals.
Main Methods:
- Numerical and experimental investigation of optical injection in semiconductor lasers.
- Exploiting redshift-induced cavity resonance enhancement for microwave phase shifting.
- Analyzing the linearity of phase shift with respect to frequency.
Main Results:
- Achieved a continuously tunable microwave time delay range exceeding 80 ps.
- Demonstrated constant time delay over a 7 GHz instantaneous bandwidth.
- Preserved data quality with a bit-error ratio of 10^-9 at 2.5 Gb/s.
- Observed a potential 5 dB improvement in detection sensitivity.
Conclusions:
- The photonic approach offers a viable method for tunable microwave time delay.
- Adjusting injection power or frequency allows for control over time delay.
- This technique shows promise for advanced microwave signal processing applications.
