Polarization switching VCSEL (P-VCSEL)

Period of Performance: 03/04/2010 - 08/22/2010

$98.9K

Phase 1 STTR

Recipient Firm

Ziva Corp.
6440 Lusk Blvd D-107
San Diego, CA 92121
Principal Investigator
Firm POC

Research Institution

University of California, Santa Barbara
Office of Research
Santa Barbara, CA 93106
Institution POC

Abstract

Ziva Corporation in collaboration with UCSB will assess the feasibility of developing a directly modulated polarization switching laser based on the Vertical Cavity Surface Emitting Laser (VCSEL) geometry with a 3dB frequency of at least 10 GHz. This will be a major breakthrough in the ability to cost effectively fabricate directly modulated lasers (even in 2-D arrays) with polarization diversity which has hitherto been only possible by using expensive, bulky and lossy external modulators. The basic principle that we propose relies on the fact that the polarization of a diode laser optical output can be influenced by the direction of the current flow. As opposed to the horizontal geometry of a waveguide diode laser, the vertical VCSEL geometry makes it possible to inject pump current in two orthogonal directions. Two electrode pairs can be placed orthogonally around the cavity and the resulting orthogonal current directions can overcome the built-in asymmetry given by birefringence to actively control the polarization of the emitted laser light. We believe that this new class of device will be critical for laser-detection-and-ranging (LADAR) applications, and will open up a whole new class of devices and applications which exploit high speed polarization modulation.