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Published on: November 30, 2012
Variable optical attenuator based on photonic crystal waveguide with low-group-index tapers.
Applied Optics
|October 3, 2013
Summary
We developed a compact thermo-optic variable optical attenuator (VOA) using a W1 photonic crystal waveguide (PCW). This device achieves a 29 dB attenuation range in a tiny 16.8 μm length, improving optical device performance.
Area of Science:
- Photonics
- Optoelectronics
- Materials Science
Background:
- Photonic crystal waveguides (PCWs) offer unique light manipulation properties.
- Variable optical attenuators (VOAs) are crucial components in optical communication systems.
- Existing VOAs often face limitations in size, attenuation range, or insertion loss.
Purpose of the Study:
- To demonstrate a compact and efficient thermo-optic variable optical attenuator (VOA).
- To leverage the cutoff effect in a W1 photonic crystal waveguide (PCW) for VOA functionality.
- To enhance coupling efficiency between PCWs and conventional strip waveguides.
Main Methods:
- Utilizing the thermo-optic effect within a W1 PCW.
- Implementing a device structure exploiting the waveguide's cutoff phenomenon.
- Integrating low-group-index tapers for improved waveguide coupling.
Main Results:
- Achieved a variable attenuation range of 29 dB.
- Device length is remarkably compact at only 16.8 μm.
- Reduced coupling loss by 7.5±2.5 dB using specialized tapers.
Conclusions:
- The demonstrated thermo-optic VOA offers the largest variable attenuation range among tunable PCW devices reported to date.
- The compact size and enhanced coupling efficiency make this VOA suitable for integrated photonic applications.
- This work presents a significant advancement in VOA technology for optical systems.
