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Proceedings Paper

Design of tapered uniform compact monolithically integrated semiconductor spot-size converters for efficient laser-fiber coupling
Author(s): B. M. Azizur Rahman; E. O. Ladele; Tiparatana Wongcharoen; S. S. A. Obayya; Kenneth T. V. Grattan
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Paper 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.

Paper Details

Date Published: 17 February 2003
PDF: 8 pages
Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.473825
Show Author Affiliations
B. M. Azizur Rahman, City Univ. London (United Kingdom)
E. O. Ladele, City Univ. London (United Kingdom)
Tiparatana Wongcharoen, Bangkok Univ. (Thailand)
S. S. A. Obayya, City Univ. London (United Kingdom)
Kenneth T. V. Grattan, City Univ. London (United Kingdom)

Published in SPIE Proceedings Vol. 4833:
Applications of Photonic Technology 5
Roger A. Lessard; George A. Lampropoulos; Gregory W. Schinn, Editor(s)

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