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Total reflection optical waveguide switching through dielectric chip motion.

H Terui, M Kobayashi

|March 25, 2010

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A novel optical waveguide switch uses a moving dielectric chip to control total reflection, achieving a 22.5° switching angle. This device demonstrates a practical 1x3 optical switch driven by electromagnets.

Area of Science:

Photonics and Optical Engineering
Materials Science

Background:

Optical waveguide switches are crucial components in optical communication systems.
Existing switching mechanisms often involve complex fabrication or limited performance.

Purpose of the Study:

To develop a novel optical waveguide switch based on critical angle total reflection.
To demonstrate a compact and efficient switching mechanism using a movable dielectric chip.

Main Methods:

Fabrication of a SiO(2)-Ta(2)O(5) waveguide with a low refractive-index channel.
Utilizing a Gadolinium Gallium Garnet (GGG) chip for controlled contact/non-contact with the waveguide surface.
Employing electromagnets to actuate the dielectric chip for switching.

Main Results:

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Achieved a switching angle of 22.5 degrees for the TE(0) mode at 0.633-micrometer wavelength.
Obtained an extinction ratio between 12-16 dB, indicating effective signal control.
Demonstrated a functional 1x3 optical switch with two electromagnet-driven switching positions.

Conclusions:

The proposed method effectively utilizes critical angle total reflection for optical switching.
The demonstrated device offers a promising approach for compact and low-voltage optical waveguide switches.