Title :
Narrow-band vertically stacked filters in InGaAlAs/InP at 1.5 μm
Author :
Han, Sang-Kook ; Ramaswamy, Ramu V. ; Tavlykaev, Robert F.
Author_Institution :
Photonic Devices Lab., Hyundai Electron. Ind. Co. Ltd., South Korea
fDate :
1/1/1996 12:00:00 AM
Abstract :
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 μm with a bandwidth of 18 Å and transfer efficiency of ~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
Keywords :
III-V semiconductors; aluminium compounds; gallium arsenide; indium compounds; optical communication equipment; optical directional couplers; optical fabrication; optical testing; optical waveguide filters; optical waveguide theory; refractive index; wavelength division multiplexing; 1.5 mum; 46 to 68 percent; InGaAlAs-InP; InGaAlAs/InP; band-edge; center wavelength; effective-index method; filter structure; highly asymmetrical; modified coupled-mode theory; multichannel filter device; narrow ridge; narrow-band vertically stacked filters; narrow-band wavelength filter; numerical simulation; prescribed filter response; spectral index method; transfer efficiency; usable spectral range; vertically coupled directional coupler; wide strip-loaded waveguide; Bandwidth; Directional couplers; Filtering theory; Filters; Indium phosphide; Narrowband; Numerical simulation; Spectral analysis; Testing; Wavelength measurement;
Journal_Title :
Lightwave Technology, Journal of
