Abstract
High fiber insertion loss to semiconductor lasers and modulators is a major concern for lightwave communication system design. For semiconductor devices with reasonable modal asymmetry, such as laser diodes, fiber coupling efficiencies of 50% can be obtained.1 This is achieved by mechanically aligning a lensed fiber to the guide facet with position accuracy of better than the beam waist of the guided mode (i.e., 1 μm accuracy). Since above threshold the light output is approximately linearly dependent on the driving current, the device heat dissipation will quadratically depend on the light power in the fiber. This quadratic dependence of device heat generation on the fiber coupling efficiency results in laser lifetime reduction, specially for uses where large optical power in the fiber is required.
© 1992 Optical Society of America
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