Reflection characteristics and cascadability of a multi-mode interference 3dB coupler

Author

Shibata, Y. ; Oku, S. ; Yamamoto, M. ; Naganuma, M.

Author_Institution

NTT Photonics Labs., Kanagawa, Japan

Volume

149

Issue

56

fYear

2002

Firstpage

217

Lastpage

221

Abstract

Reflection characteristics and cascadability of multi-mode interference (MMI) 3 dB couplers are investigated. Quantitative reflection characteristics of MM I couplers were investigated using a low-coherence interferometric reflectometer. The MMI couplers were fabricated in an InP/InGaAsP/InP double-hetero structure. The reflectivity from the interface between the MMI region and output waveguide is shown to be less than -30 dB. The cascadability of MMI couplers is also investigated by comparing a branching ratio of an MMI coupler and a Y branch. It is shown that the mode-filtering effect of MMI couplers enables the cascade connection with stable blanching ratio.

Keywords

gallium arsenide; gallium compounds; indium compounds; integrated optics; light interference; light interferometry; optical couplers; optical testing; reflectivity; reflectometry; InP-InGaAsP-InP; InP/InGaAsP/InP double-heterostructure; branching ratio; cascadability; low-coherence interferometric reflectometer; mode-filtering effect; multi-mode interference coupler; output waveguide; reflection characteristics; reflectivity; stable blanching ratio;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:20020497

Filename

1176184