Buried-Heterostructure Laser Packaging for Wideband Optical Transmission Systems

The design and performances of packaged buried-heterostructure lasers (BH Lasers) are discussed. High laser-to-fiber coupling efficiencies of more than 50% are attained by a simple end-butt coupling scheme of using taper-ended graded-index optical fibers. In addition, modulation bandwidths of more than 1 GHz are realized through the reduction of parasitics due to the packaging. The equivalent circuit of the packaged device as well as the temperature dependence of the threshold current is also clarified to aid in the design of optical transmitter circuits.