Experimental Evaluation of the Coupling Efficiency between Monolithically Integrated DFB Lasers and Waveguides

Hiroaki TAKEUCHI  Kazuo KASAYA  Kunishige OE  

IEICE TRANSACTIONS (1976-1990)   Vol.E73   No.1   pp.53-58
Publication Date: 1990/01/25
Online ISSN: 
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>>
Buy this Article

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.