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

Wei Liang, Naresh Satyan, Amnon Yariv, Anthony Kewitsch, George Rakuljic, Firooz Aflatouni, Hossein Hashemi, and Jeffrey Ungar

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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.

©2007 Optical Society of America

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Figures (3)
Fig. 1.
Fig. 1. Schematics of the experimental setup to coherently combine the optical power of two MOPA SCLs local oscillator by phase-locking them, separately to the same low power master laser.

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Fig. 2.
Fig. 2. Measured power spectrum of the locked beat signal.

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Fig. 3.
Fig. 3. (a) and (b) Comparison of the time domain waveforms of the output signals of the photo detectors in the two OPLLs. (c) Time domain measurement of the coherently combined power.

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