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Proceedings Paper

Optimization of electro-optic phase shifters for integrated optical phased arrays
Author(s): Dwayne D. Macik; Tyler E. Bravo; Seeley M. Pentecost; Francisco A. Espinal; Christi K. Madsen
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Paper Abstract

A low-loss, high-speed optical phased array (OPA) has been designed and fabricated. Two different platforms have been utilized in combination to leverage electro-optic (EO) tuning. A lithium niobate (LiNbO3) optical phased array was fabricated and used in conjunction with a silicon nitride (Si3N4) 8x8 waveguide array that condenses the output pitch and utilizes the TriplexTM waveguide technology. This OPA allows for the non-mechanical beam steering (NMBS) of 1550 nm light on an edge coupled optic platform and takes advantage of the high electro-optic coefficient and high speed capability of LiNbO3 for electro-optic phase tuning. This coupled OPA has an overall insertion loss of ~3.5 dB which is advantageous to silicon-on-insulator OPAs that have shown overall insertion losses of ~14 dB. To characterize and tune this device, a 3 lens imaging system was employed to produce both near- and far- field intensity patterns of the output of the OPA on a static image plane. At the image plane, a high resolution infrared camera was used to observe the resulting intensity pattern. The control software for tuning the OPA reads the intensity incident at a specified position on the detector array, and has a PWM interface to drive the electro-optic phase controls. Beam steering was accomplished using an iterative tuning algorithm.

Paper Details

Date Published: 11 May 2017
PDF: 10 pages
Proc. SPIE 10181, Advanced Optics for Defense Applications: UV through LWIR II, 1018105 (11 May 2017); doi: 10.1117/12.2262725
Show Author Affiliations
Dwayne D. Macik, Texas A&M Univ. (United States)
Tyler E. Bravo, Texas A&M Univ. (United States)
Seeley M. Pentecost, Texas A&M Univ. (United States)
Francisco A. Espinal, Texas A&M Univ. (United States)
Christi K. Madsen, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 10181:
Advanced Optics for Defense Applications: UV through LWIR II
Jay N. Vizgaitis; Bjørn F. Andresen; Peter L. Marasco; Jasbinder S. Sanghera; Miguel P. Snyder, Editor(s)

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