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Phase-Controlled Apertures Using Heterodyne Optical Phase-Locked Loops

Satyan, Naresh and Liang, Wei and Aflatouni, Firooz and Yariv, Amnon and Kewitsch, Anthony and Rakuljic, George and Hashemi, Hossein (2008) Phase-Controlled Apertures Using Heterodyne Optical Phase-Locked Loops. IEEE Photonics Technology Letters, 20 (11). pp. 897-899. ISSN 1041-1135. doi:10.1109/LPT.2008.922335.

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In this letter, we demonstrate the use of an electronic feedback scheme using a voltage controlled oscillator (VCO) to control the optical phase of individual semiconductor lasers (SCLs) phase locked to a common reference laser using heterodyne optical phase-locked loops (OPLLs). The outputs of two external cavity SCLs phase-locked to a common reference laser are coherently combined, and the variation in the relative optical path lengths of the combining beams is corrected by dynamically changing the phase of the offset radio-frequency signal fed into one of the OPLLs by means of a VCO. A stable power combination efficiency of 94% is achieved. This inherently different method of phase control, i.e., electronic rather than the use of electrooptic crystals, is deemed essential for new applications involving coherent optoelectronics.

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Additional Information:© Copyright 2008 IEEE. Reprinted with permission. Manuscript received November 30, 2007; revised January 15, 2008. This work was supported by the Defense Advanced Research Projects Agency’s (DARPA) MTO Office.
Subject Keywords:Coherent optics; optical phase-locked loops (OPLLs); semiconductor laser (SCL) arrays
Issue or Number:11
Record Number:CaltechAUTHORS:SATieeeptl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10617
Deposited By: Archive Administrator
Deposited On:21 May 2008
Last Modified:08 Nov 2021 21:09

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