Coherent Power Combination of Two Master-Oscillator-Power Amplifier (MOPA) Semiconductor Lasers Using Optical Phase Lock Loops
Journal Article - Open Access
California Institute of Technology Pasadena United States
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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.
- Lasers and Masers