Title :
A novel vertical directional coupler switch with switching-operation-induced section and extinction-ratio-enhanced section
Author :
Cho, Sung-Chan ; Jung, Byung-Min ; Kim, Boo-Gyoun ; Hong, Hyun Ha ; Shakouri, Ali
Author_Institution :
Opt. Packet Routing Team, ETRI, Taejon, South Korea
fDate :
9/1/2002 12:00:00 AM
Abstract :
A novel vertical directional coupler switch with a switching-operation-induced section and an extinction-ratio-enhanced section is proposed. Switching operation is achieved by changing the refractive indexes of both cores in the switching-operation-induced section, and an improvement of extinction ratios larger than 30 dB for both cross and bar states is achieved by controlling the asymmetry of the refractive indexes of two cores in the extinction-ratio-enhanced section without changing the refractive index of the inner-cladding layer between the two waveguides. The required refractive indexes for the cores in the switching-operation-induced and extinction-ratio-enhanced sections are calculated for various thickness of the inner-cladding layer.
Keywords :
claddings; optical directional couplers; optical switches; refractive index; asymmetry; bar states; cross states; extinction ratios; extinction-ratio-enhanced section; extinction-ratio-enhanced sections; inner-cladding layer thickness; refractive indexes; switching-operation-induced section; switching-operation-induced sections; vertical directional coupler switch; Directional couplers; Extinction ratio; High speed optical techniques; Optical fiber networks; Optical packet switching; Optical refraction; Optical variables control; Optical waveguides; Refractive index; Switches;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2002.802215
