title: 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.
authors.forename: Wei
authors.initials: W
authors.lastname: Liang
authors.forename: Naresh
authors.initials: N
authors.lastname: Satyan
authors.forename: Amnon
authors.initials: A
authors.lastname: Yariv
authors.forename: Anthony
authors.initials: A
authors.lastname: Kewitsch
authors.forename: George
authors.initials: G
authors.lastname: Rakuljic
authors.forename: Firooz
authors.initials: F
authors.lastname: Aflatouni
authors.forename: Hossein
authors.initials: H
authors.lastname: Hashemi
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Ungar