Title

Integrated Beam-Steered Optical Switch

Keywords

Electro-optic switch; Free-carrier induced refractive index change; Integrated optical switch; Optical beam steering

Abstract

We report an optical switch that is based on the beam steering of an optical waveguide formed by injection of electrons in a p-i-n slab waveguide structure. The structure consists of an undoped InGaAsP multiple quantum well (MQW) layer, with a total thickness of 0.28 μm that is sandwiched between n-doped InP cladding layers. Zinc is diffused into the top cladding layer through a silicon nitride mask to form the p-regions on top of which a pair of 10 μm wide parallel titanium-zinc-gold contact stripes are deposited by evaporation and lift-off. The gap between the stripes is 20 μm wide and the device is cleaved to a length of 800 μm. Electrical currents are injected through the electrodes and a laser beam is launched into the middle of the gap region. The injected electrons accumulate in the MQW layer and spread sideways by diffusion. The regions that are saturated with electrons experience a decrease in refractive index and surround a narrow high index region effectively forming a channel waveguide. By carefully controlling the current ratio through the two parallel stripes, the waveguide can be shifted, thereby steering the guided laser beam.

Publication Date

12-24-2004

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5435

Number of Pages

91-96

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.543855

Socpus ID

10444256522 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/10444256522

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