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Wavelength characteristics of (2×2) optical channel-type directional couplers with symmetric or nonsymmetric coupling structures

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3 Author(s)
Takagi, A. ; NTT Opto-electron. Lab., Ibaraki, Japan ; Jinguji, K. ; Kawachi, M.

The wavelength dependence of waveguide-type directional couplers is investigated with respect to waveguide pattern symmetry in the coupling region. A rough approximation of the dependence is determined based on simplified transfer matrix multiplications, followed by a more detailed computer calculation using the beam propagation method (BPM). Wavelength-flattened coupling characteristics over a wide range, for example, from 1.33-1.55 μm, are predicted for several types of directional coupler with waveguide width asymmetry or a tapered width structure in the coupling region

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Lightwave Technology, Journal of  (Volume:10 ,  Issue: 6 )