Accession Number : ADP008126

Title :   Theoretical Investigation on Coupling Behaviour of Semiconductor / Glass Meander Coupler,

Corporate Author : HEINRICH-HERTZ-INST FUER NACHRICHTENTECHNIK BERLIN G M B H (GERMANY F R)

Personal Author(s) : Nolting, H. P.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : The possibility to enhance the spectral performance of the recently developed meander coupler as narrow band wavelength sensitive multiplexer/demultiplexer is investigated. The device is a strongly asymmetric co-directional coupler with a periodic waveguide variation (grating) for phase matching for one center-wavelength. A narrow filter halfwidth (FWHM) can be accomplished by combining two waveguides with a large effective index and/or a large dispersion difference. A FWHM reduction from 4 to 1 nm per mm device length is possible by adding a glass waveguide to the bulk InGaAsP/InP material system. For calculating the characteristics of a vertically stacked layer structure, a 1D eigenvalue and BPM analysis is a well established approach. In the present case, however, the problem arises that the effective index of the glass waveguide is lower than the refractive index of the semiconductor substrate, leading to leaky modes.

Descriptors :   *OPTICAL CIRCUITS, *COUPLING CIRCUITS, *SYMPOSIA, MULTIPLEXING, GERMANY, SEMICONDUCTOR DEVICES, GLASS, REFRACTIVE INDEX, NARROWBAND, EIGENVALUES, GRATINGS(SPECTRA), INDIUM PHOSPHIDES.

Subject Categories : Electrooptical and Optoelectronic Devices
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE