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Meander-type wavelength demultiplexer with weighted coupling

 

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Applied Physics Letters 61 (1992), No.17, pp.2018-20
ISSN: 0003-6951
ISSN: 1077-3118
English
Journal Article
Fraunhofer HHI ()
crosstalk; demultiplexing equipment; finite difference methods; gallium arsenide; iii-v semiconductors; indium compounds; optical communication equipment; optical couplers; optical filters; wavelength division multiplexing; numerical simulations; meander-type wavelength demultiplexers; weighted coupling; two-dimensional finite difference analysis; coupling mode method; rib waveguides; transmission characteristics; sidelobes; wavelength filters; 1.3 micron; GaInAsP-InP

Abstract
An experimental and theoretical investigation of meander-type wavelength demultiplexers with weighted coupling is reported. Numerical simulations have been performed combining a two-dimensional finite difference analysis and a suitably developed coupling mode method. Devices have been realized based on rib waveguides in GaInAsP/InP with filter center wavelengths around 1.3 mu m. With weighted coupling the sinc2( lambda )-type transmission characteristics of standard meander couplers change and the sidelobes of the latter devices are efficiently suppressed. The authors further show the determination of optimum weighted coupling for wavelength filters meeting given requirements with respect to channel separation, maximum allowable crosstalk, and total device length.

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