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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Single-mode fiber-linearly tapered planar waveguide tunable coupler.
1Department of Electronics and Telecommunication Engineering, Jadavpur University, Calcutta 700032, India.
Applied Optics
|February 9, 2008
Summary
Researchers created a tunable fiber-film coupler using a tapered waveguide and fiber half-coupler. Adjusting the half-coupler position tunes optical power throughput, enabling filter applications.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Evanescent coupling is key for optical device integration.
- Planar waveguides (PWG) offer miniaturization potential.
- Tunable optical components are crucial for advanced systems.
Purpose of the Study:
- To develop a simple, tunable fiber-film coupler.
- To investigate the influence of film properties and wavelength on coupler performance.
- To demonstrate wavelength-selective filtering capabilities.
Main Methods:
- Fabrication of tapered and plano-concave thin-film PWGs.
- Evanescent coupling of PWGs with a single-mode fiber half-coupler.
- Theoretical analysis using Marcuse's model.
- Experimental characterization of throughput power and wavelength dependence.
Main Results:
- Demonstrated tunable optical power modulation by shifting the fiber half-coupler position along the tapered PWG.
- Observed wavelength-dependent throughput power, acting as an optical filter.
- Achieved good agreement between theoretical predictions and experimental results.
Conclusions:
- The developed system provides a simple method for tunable fiber-film coupling.
- The tunable coupler exhibits filtering characteristics, controllable by half-coupler position.
- This technology is promising for efficient optical coupling and filtering applications.
