Three-phase photoconductive elements for directional free-space optical sensing

Xian Jin; Daniel Guerrero; Jonathan F. Holzman

doi:10.1117/12.908958

2 March 2012 Three-phase photoconductive elements for directional free-space optical sensing

Xian Jin, Daniel Guerrero, Jonathan F. Holzman

Author Affiliations +

Proceedings Volume 8257, Optical Components and Materials IX; 82570R (2012) https://doi.org/10.1117/12.908958
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

An integrated photoconductive (PC) element is introduced as a new optoelectronic device in free-space optical (FSO) wireless applications. The device is a fundamental extension of the standard PC switch, as it has the capabilities for both local optoelectronic signal reception and active directional angle of arrival (AOA) sensing. This second capability is brought about through the use of a three-phase differential technique through three triangular PC switches arranged in a corner-cube architecture. Each PC switch is comprised of 50/150 nm Cr/Au electrodes, patterned on either side of a 200- micron GaAs PC gap, and is biased with the superposition of common DC and AC three-phase (120° phase-shifted) bias voltages. The DC bias forms a summed signal photocurrent on the central vertex output electrode and facilitates data reception; the AC three-phase bias facilitates link reliability for diversity reception in optical wireless communication systems. Complete theoretical and experimental angular characteristics of this device are presented in this work.

Citation Download Citation

Xian Jin, Daniel Guerrero, and Jonathan F. Holzman "Three-phase photoconductive elements for directional free-space optical sensing", Proc. SPIE 8257, Optical Components and Materials IX, 82570R (2 March 2012); https://doi.org/10.1117/12.908958

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