23 February 1989 Coupling Non-Circular Core Optical Fibers To Laser Diodes
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Butt coupling efficiencies reported to date for conventional circular core optical fiber have been low due to the mismatch between the emission profiles of the laser diode and the optical fiber. Attempts to use lenses to increase the coupling efficiency has resulted in the degradation of the laser performance due to external optical feedback from the lenses or from the front end of the fiber. If the fiber is bonded directly to the front facet of the laser, the external optical feedback from the front facet of the fiber is eliminated. A higher coupling efficiency is realized through the use of a non-circular core optical fiber, such as an elliptical core fiber, which more closely matches the highly divergent, elliptically shaped, laser diode emission profile.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark N. Donhowe, Robert G. Hunsperger, "Coupling Non-Circular Core Optical Fibers To Laser Diodes", Proc. SPIE 0988, Components for Fiber Optic Applications III and Coherent Lightwave Communications, (23 February 1989); doi: 10.1117/12.959754; https://doi.org/10.1117/12.959754

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