Phase-Controlled Apertures Using Heterodyne Optical Phase-Locked Loops
Abstract
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.
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.Files
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Additional details
- Eprint ID
- 10617
- Resolver ID
- CaltechAUTHORS:SATieeeptl08
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2008-05-21Created from EPrint's datestamp field
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2021-11-08Created from EPrint's last_modified field