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TE/TM mode splitters on InGaAsP/InP



IEEE Photonics Technology Letters 2 (1990), No.2, pp.114-15
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()
directional couplers; gallium arsenide; gallium compounds; iii-v semiconductors; indium compounds; metallisation; optical couplers; optical waveguides; te/tm mode splitters; monolithic heterodyne polarization diversity receiver; tm polarization; optical wave; directional coupler; metal cladding; polarization splitters; lateral confinement; optical rib waveguide; asymmetric coupler; metallized waveguide; tm-crosstalk; InGaAsP-InP

In a monolithic heterodyne polarization diversity receiver, mode splitters which effectively separate the TE and TM polarization of the optical wave are required. For this purpose, a directional coupler which utilizes a metal cladding on one of its branches to separate both polarizations was investigated. The polarization splitters can act in two distinct modes of operation, depending on the degree of lateral confinement of the optical rib waveguide before an asymmetric coupler. For weak confinement, the metallized waveguide is guiding for TE- but nonguiding for TM-polarization, and negligible TM-crosstalk results.