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Theoretical investigations of optical waveguide tapers on InGaAsP/InP

: Nolting, H.P.; Weinert, C.M.

Frequenz 45 (1991), Nr.5-6, S.130-40
ISSN: 0016-1136
ISSN: 2191-6349
Fraunhofer HHI ()
difference equations; gallium arsenide; gallium compounds; iii-v semiconductors; indium compounds; optical couplers; optical waveguide theory; optical waveguide tapers; dielectric waveguides; spot sizes; field distribution; glass fiber; semiconductor waveguide; taper geometries; refractive index; two-dimensional finite difference method; waveguide cross section geometry; beam propagation method; radiation losses; fabrication

Optical waveguide tapers which connect two dielectric waveguides with different spot sizes of the field distribution are investigated theoretically. Taking the coupling of a glass fiber to a semiconductor waveguide as an example, taper geometries are investigated which have short length and no variation of the refractive index along the structure. The two-dimensional finite difference method is used to calculate the dependence of the field of the waveguide cross section geometry and the beam propagation method is used to determine the radiation losses. The theoretical results and the necessary steps for fabrication of tapers on InGaAsP/InP are discussed.