Low-loss fibre-coupled waveguide directional coupler modulator

10 June 1982

journal article
Published by Institution of Engineering and Technology (IET) in Electronics Letters

Vol. 18 (12) , 490-491
https://doi.org/10.1049/el:19820333

Abstract

We report a fibre-coupled Ti: LiNbO₃ directional coupler modulator with total fibre-device-fibre insertion loss as low as 1.5 dB for λ=1.32 μm. Low loss has been achieved by using diffusion parameters to give good mode match to the fibre and low propagation loss, an effective SiO₂ buffer layer to eliminate electrode loading loss and a directional coupler geometry which minimises the effect of bend loss.

Keywords

FIBRE-DEVICE-FIBRE INSERTION LOSS
FIBRE-COUPLED TI:LINBO3 DIRECTIONAL COUPLER MODULATOR
SIO2 BUFFER LAYER
ELECTRODE LOADING LOSS
DIFFUSION PARAMETERS

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