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Coupling technique for efficient interfacing between silica waveguides and planar photonic crystal circuits
Yuan-Fong Chau1, Tzong-Jer Yang, Win-Der Lee
1Department of Electrical Engineering, Lee-Ming Institute of Technology, Taipei 30050, Taiwan. yfchau@mail.apol.com.tw
Applied Optics
|January 14, 2005
Summary
This study introduces a two-step-size tapered structure for planar photonic crystal (PPC) waveguides. The optimized design significantly enhances coupling efficiency and power transmission for optical communications.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Planar photonic crystal (PPC) waveguides are crucial for integrated optics.
- Efficient coupling and frequency control are key challenges in PPC waveguide design.
Purpose of the Study:
- To enhance coupling efficiency at the input/output of PPC waveguides.
- To enable tunable frequency control for optical communication applications.
- To explore the use of PPC tapers as optical reflectors.
Main Methods:
- Simulations of a two-step-size tapered PPC waveguide structure.
- Optimization of defect pair configuration within the waveguide.
- Analysis of power transmission and spectral characteristics.
Main Results:
- Achieved power transmission above 90% at 1.55 microm wavelength.
- Demonstrated control over central frequency via defect configuration.
- Showcased the potential for PPC tapers to function as efficient reflectors.
Conclusions:
- The proposed two-step-size tapered structure significantly improves PPC waveguide performance.
- This design offers a method for precise frequency tuning in optical communication systems.
- Adjustable defect radii provide versatility for creating optical reflector components.