We have experimentally demonstrated current-injection optical phase-lock loops (OPLLs) based on commercial single-section semiconductor distributed-feedback (DFB) lasers. Using two parallel OPLLs, we have obtained 87% efficient coherent power combining of the two DFB lasers. The rms differential phase error between the two lasers is about 30°.
© 2007 Optical Society of America
Lasers and Laser Optics
Original Manuscript: August 29, 2006
Revised Manuscript: November 9, 2006
Manuscript Accepted: November 10, 2006
Published: January 26, 2007
Wei Liang, Amnon Yariv, Anthony Kewitsch, and George Rakuljic, "Coherent combining of the output of two semiconductor lasers using optical phase-lock loops," Opt. Lett. 32, 370-372 (2007)