曲導波路を利用する半導体偏波回転素子の設計

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概要

• 論文の詳細を見る

• Polarization of light wave propagating in typical optical fibers is random, yet many semiconductor optical devices are polarization sensitive. Semiconductor polarization rotators, therefore, are necessary to facilitate a more effective link between fibers and OEIC devices. Recently, a bending waveguide based polarization rotator, which promises easy fabrication, low loss and high conversion efficiency, has been proposed and demonstrated. In this report, a model for this device is described. The derivation of the full-vectorial wave equations for the propagation of electric field in bending waveguides follows closely to that found in, which is expressed in terms of the local coordinate system. Let R be the radius of the bending waveguide and assume that the propagation constant β is the average of both β_TE and β_TM. It is found that if |βR|>> 1, then in the vicinity of the waveguide such that |x|<< R, the full-vectorial wave equations can be simplified to those for straight waveguides if the refractive index profile is replaced by n_EQ(x,y)=n(x,y)(x+R)/R Where n is the cross-sectional refractive index profile. This approach is consistent with the conventional method for bending waveguide analysis, of which the validity has been recently verified. A direct way to analyse the polarization conversion mechanism in a bending waveguide is by means of a beam propagating method (BPM) based on the full-vectorial wave equations as in. The accuracy afforded by this approach, unfortunately falls short of our requirements. Instead, we take a less direct but more intuitive approach -- via the coupled-mode theory (CMT). By comparing theoretical calculation results with measurement data, it is concluded that the predictive power of the present model for the purpose of design and analysis of bending waveguide based semiconductor polarization rotators is considered satisfactory. Further details will be discussed at the presentation.

• 社団法人電子情報通信学会の論文
• 1997-08-13

著者

• ルイ ウェイン

  Nttフォトニクス研究所

• ルイ ウェイン

  NTT 光エレクトロニクス研究所

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