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Experimental Evaluation of the Coupling Efficiency between Monolithically Integrated DFB Lasers and Waveguides
Hiroaki TAKEUCHI Kazuo KASAYA Kunishige OE
IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/01/25
Print ISSN: 0000-0000
Type of Manuscript: Special Section PAPER (Special Issue on International Conference on Integrated Optics and Optical Fiber Communication)
Category: Optical Semiconductor Devices and OEICs
Full Text: PDF>>
As one of the approaches to developing a monolithic integrated device, optical coupling efficiency between a monolithically integrated DFB laser and a passive waveguide is experimentally evaluated. A butt-joint coupling is selected in this study, because it is expected to produce a higher coupling efficiency than any other coupling techniques. The DFB laser is butt-jointed with the waveguide by a low-pressure MOVPE selective growth, which produces no overgrowth at the butt-joint region. The average efficiency is evaluated to be 60%. The distribution of the evaluated efficiency indicates that the coupling efficiency of more than 50% can be obtained with good reproducibility.