Abstract
Design and lasing characteristics of ?=1.3 ?m GaInAsP twin-stripe (TS) metal-clad ridge-waveguide lasers, with a varying degree of index guiding between the channels are reported. The TS devices operate stably in the TE polarised mode, even if under single-stripe injection TM polarisation is observed. Effective longitudinal mode selectivity has been obtained for the TS lasers with an effective index step in the range of 1×10?2 to 5×10?3 between the channels. This mode selectivity can be explained by assuming coupling of lateral modes of the twin waveguide structure via the common gain-medium.
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