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Variable carrier reduction in radio-over-fiber systems for increased modulation efficiency using a Si3N4 tunable
Andreas Perentos1, Francisco Cuesta-Soto, Manuel Rodrigo
1Department of Electrical & Computer Engineering, University of Cyprus, Nicosia 1678, Cyprus. perentos@ucy.ac.cy
Optics Express
|November 29, 2012
Summary
This study demonstrates a silicon nitride ring resonator notch filter to reduce optical carriers in a 10 GHz radio-over-fiber system. This method improves modulation efficiency by up to 20 dB.
Area of Science:
- Photonics
- Optical Communications
- Materials Science
Background:
- Radio-over-fiber (RoF) systems require efficient modulation.
- Optical carrier suppression is crucial for improving signal quality and reducing noise.
- Silicon nitride (Si3N4) offers excellent optical properties for integrated photonic devices.
Purpose of the Study:
- To demonstrate variable optical carrier reduction using a tunable Si3N4 ring resonator notch filter.
- To enhance modulation efficiency in a 10 GHz RoF system.
- To investigate the tunability of the filter's extinction ratio.
Main Methods:
- Fabrication of a Si3N4 ring resonator notch filter.
- Integration of micro-heaters for tuning the Mach-Zehnder coupler.
- Experimental demonstration in a 10 GHz RoF system.
- Measurement of modulation depth improvement.
Main Results:
- Variable optical carrier reduction was successfully achieved.
- The filter's extinction ratio was tuned using micro-heaters.
- A modulation depth improvement of up to 20 dB was experimentally verified.
- Enhanced modulation efficiency in the RoF system.
Conclusions:
- The tunable Si3N4 ring resonator notch filter is effective for optical carrier reduction.
- This technique significantly improves modulation efficiency in RoF systems.
- The tunable filter offers a practical solution for enhancing RoF system performance.
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