Design of tapered uniform compact monolithically integrated semiconductor spot-size converters for efficient laser-fiber coupling

B. M. Azizur Rahman; E. O. Ladele; Tiparatana Wongcharoen; S. S. A. Obayya; Kenneth T. V. Grattan

doi:10.1117/12.473825

17 February 2003 Designs of tapered, uniform and compact monolithically integrated semiconductor spot-size converters for efficient laser-fiber coupling

B. M. Azizur Rahman, E. O. Ladele, Tiparatana Wongcharoen, S. S. A. Obayya, Kenneth T. V. Grattan

Author Affiliations +

Proceedings Volume 4833, Applications of Photonic Technology 5; (2003) https://doi.org/10.1117/12.473825
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada

Abstract

When a photonic device is directly butt-coupled to a single mode fiber, often there is a 90% or more optical power loss, due to their highly unequal spot-sizes. Often, by using complex microlenses, the coupling efficiency has been increased, but however at the expense of a sub-micron alignment tolerance requirement, and consequently higher associated cost for a reliable operation. Recently, monolithically integrated devices, mostly using tapered structures, have been reported as useful to modify the spot-size of semiconductor photonic devices, which could assist in the rapid implementation of 'fiber-to-the-home'. In this work, spot-size converters with a tapered core, also using novel uniform directional couplers and MMI structures are discussed. A rigorous numerical approach, based on the full vectorial finite element method, is used to design various types of monolithically integrated spot-size converters for efficient coupling to an optical fiber and results of their performance reported.

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B. M. Azizur Rahman, E. O. Ladele, Tiparatana Wongcharoen, S. S. A. Obayya, and Kenneth T. V. Grattan "Designs of tapered, uniform and compact monolithically integrated semiconductor spot-size converters for efficient laser-fiber coupling", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); https://doi.org/10.1117/12.473825

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