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Demonstration of arbitrary channel selection utilizing a pulse-injected semiconductor laser with a phase-locked loop
1Institute of Photonics Technologies, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan.
Optics Express
|January 26, 2011
Summary
This study demonstrates an arbitrary channel selection system using a pulse-injected semiconductor laser and phase-locked loop (PLL). The system enables flexible selection and enhancement of microwave frequency comb channels without external modulators.
Area of Science:
- Photonics
- Optical Communications
- Semiconductor Lasers
Background:
- Microwave frequency combs generated by semiconductor lasers offer potential for advanced signal processing.
- Existing channel selection methods often require complex and costly external modulators.
Purpose of the Study:
- To experimentally demonstrate and characterize an arbitrary channel selection system.
- To achieve flexible and efficient selection of microwave frequency comb channels.
- To avoid the need for expensive external modulators.
Main Methods:
- Utilizing a pulse-injected semiconductor laser to generate a microwave frequency comb.
- Employing optical injection from a tunable laser for channel selection and enhancement.
- Implementing a phase-locked loop (PLL) for system control and stability.
Main Results:
- Demonstrated selection of primary (1.2 GHz) and secondary (10.8–18 GHz) channels with high suppression ratios (44.5 dB and 25.9 dB).
- Measured single sideband (SSB) phase noise of -60 dBc/kHz at 25 kHz offset frequency, indicating good spectral quality.
- Investigated conversion gain and crosstalk between selected channels.
Conclusions:
- The proposed system enables arbitrary channel selection in microwave frequency combs generated by pulse-injected lasers.
- Continuous adjustment of channel spacing and selection is achievable by tuning laser parameters.
- The system offers a cost-effective alternative to traditional methods by eliminating the need for external modulators.
