Open AccessCharacteristics of a multi-mode interference device based on Ti:LiNbO_3 channel waveguide
Author(s) -
Y. L. Lee,
Tae Joong Eom,
Woojin Shin,
Bong-Ahn Yu,
DoKyeong Ko,
W.-K. Kim,
H.-Y. Lee
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.010718
Subject(s) - optics , refractive index , waveguide , polarization (electrochemistry) , wavelength , materials science , oscillation (cell signaling) , interference (communication) , coupled mode theory , radiation mode , single mode optical fiber , physics , channel (broadcasting) , optical fiber , telecommunications , chemistry , biology , computer science , genetics
We have analyzed the multi-mode interference effect depending on the wavelength and the polarization states of input beam in a multi-mode Ti:LiNbO(3) waveguide at about 1300 nm region. The transmitted optical signal of a Ti:LiNbO(3) waveguide shows the periodic oscillation as a function of input wavelength. The measured average periodicity of the oscillation in TM and TE polarization beams were about 18 nm and 48 nm, respectively. Actually, the periodicity is determined by the refractive index difference between the two modes (fundamental and first modes). Therefore, we have explained the experimental results with the theoretical calculations which are derived from a quasi-analytical technique based on the effective-refractive- index method and the equation of coupling length determined by the mode phase factor in the multi-mode waveguide.