Title :
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
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;
Journal_Title :
Optoelectronics, IEE Proceedings -
DOI :
10.1049/ip-opt:20020497
