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Optical Engineering

Size tolerance analysis of a 4×4 tapered multimode interference coupler in a silicon-on-insulator structure
Author(s): Qingfeng Yan; Jinzhong Yu; Zhongli Liu
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Paper Abstract

Size tolerance of a 4×4 general interference tapered multimode interference (MMI) coupler in a silicon-on-insulator (SOI) structure is investigated by means of a 2-D finite difference beam propagation method (2D-FDBPM), together with an effective refractive index method (EIM). The results show that the tapered multimode interference coupler exhibits relatively larger size tolerance when light is launched from the edgeport than from midport, though it has much better output power uniformity when light is launched from midport. Besides that, it can reduce the device length greatly. The 4×4 general interference tapered MMI coupler has a slightly larger size tolerance compared with a conventional straight multimode interference coupler.

Paper Details

Date Published: 1 August 2003
PDF: 5 pages
Opt. Eng. 42(8) doi: 10.1117/1.1584688
Published in: Optical Engineering Volume 42, Issue 8
Show Author Affiliations
Qingfeng Yan, Institute of Semiconductors (China)
Jinzhong Yu, Institute of Semiconductors (China)
Zhongli Liu, Institute of Semiconductors (China)


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