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Design of wavelength-flattened coupler using a novel diagram

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3 Author(s)
Emori, Y. ; Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan ; Mizumoto, T. ; Naito, Yoshiyuki

A novel diagram which describes the condition of 3 dB coupler is proposed. Using the proposed diagram, the design of a wavelength-flattened 3 dB directional coupler composed of a uniform coupled waveguide is investigated. Normalized waveguide parameters are introduced to characterize a five-layer planar waveguide. This enables us to generalize the discussion and to reduce the number of parameters required for characterizing a coupled waveguide. A broadband 3 dB coupler having 50±5% coupling ratio over a wavelength range of 1.1-1.7 μm is designed

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Lightwave Technology, Journal of  (Volume:14 ,  Issue: 12 )