Narrow-band vertically stacked filters in InGaAlAs/InP at 1.5 /spl mu/m

A narrow-band wavelength filter in InGaAlAs/InP has been modeled, fabricated, and tested. A highly asymmetrical, vertically coupled directional coupler operating near the band-edge is formed by a narrow ridge and a wide strip-loaded waveguide. The results of numerical simulation, performed by employ...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 14; no. 1; pp. 77 - 83
Main Authors Sang-Kook Han, Ramaswamy, R.V., Tavlykaev, R.F.
Format Journal Article
LanguageEnglish
Published IEEE 01.01.1996
Subjects
Bandwidth
Directional couplers
Filtering theory
Filters
Indium phosphide
Narrowband
Numerical simulation
Spectral analysis
Testing
Wavelength measurement
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Summary:A narrow-band wavelength filter in InGaAlAs/InP has been modeled, fabricated, and tested. A highly asymmetrical, vertically coupled directional coupler operating near the band-edge is formed by a narrow ridge and a wide strip-loaded waveguide. The results of numerical simulation, performed by employing the spectral index method, effective-index method, and a modified coupled-mode theory, are used to fabricate a filter structure with a prescribed filter response. Operation at a center wavelength around 1.5 /spl mu/m with a bandwidth of 18 /spl Aring/ and transfer efficiency of /spl sim/46-68% is achieved. Excellent agreement between the. Designed and measured bandwidth is demonstrated. A multichannel filter device based on an array of individual filters that is capable of extending the usable spectral range is analyzed.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.476140