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Published on: November 30, 2012
Lateral and longitudinal coupled waveguides in semiconductor lasers
1Department of Electrical Engineering, Microelectronics Center and Solid State Institute, Technion, Haifa 32000, Israel. orsk@tx.technion.ac.il
Abstract:
A semiconductor laser including two laterally coupled waveguides, in which one of the waveguides includes a partially reflecting surface (an internal mirror) between its facets, is analyzed. The internal mirror inserts longitudinal coupling into the system. The spectrum of the Fabry-Perot modes exhibits modulation in the gain required for lasing threshold, with a periodicity that depends on the longitudinal position of the internal mirror. The combined coupled-cavity effect may explain the observed gain spectrum in GaN lasers.

