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Published March 19, 2007 | public
Journal Article Open

Coherent power combination of two Master-oscillator-power-amplifier (MOPA) semiconductor lasers using optical phase lock loops

Abstract

Using heterodyne Optical Phase-Locked Loops (OPLLs), two 1W high power 1550 nm master-oscillator-power-amplifier (MOPA) semiconductor lasers operating as current controlled oscillators are phase-locked to a 1 mW reference laser. The signals of the two MOPAs are then coherently combined and their mutual coherence is studied. In each OPLL, the acquisition range is increased to +/-1.1GHz with the help of an aided- acquisition circuit. Control of the phase of a single slave MOPA is demonstrated using a RF phase shifter. The differential phase error between two MOPAs locked to the common reference laser is typically 22 degrees.

Additional Information

© 2007 Optical Society of America. Received 10 January 2007; revised 4 March 2007; accepted 11 March 2007. The authors wish to acknowledge the support of DARPA's MTO office (J. Mangano, M. Stickley) and T. Salvi of Kirtland Air Force Base.

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Created:
August 22, 2023
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October 16, 2023