Design and fabrication of demultiplexers for DWDM applications

D. K. Gautam; Chitrarekha Chaudhari; L. S. Patil

doi:10.1117/12.480989

29 August 2002 Design and fabrication of demultiplexers for DWDM applications

D. K. Gautam, Chitrarekha Chaudhari, L. S. Patil

Proceedings Volume 4905, Materials and Devices for Optical and Wireless Communications; (2002) https://doi.org/10.1117/12.480989
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China

Abstract

The principle of operation and the design techniques for various types of the optical demultiplexers are reviewed. The results for two-channel optical demultiplexer based on optical directional coupler configuration are presented. The device for separating two wavelengths with 4 nm spacing is designed on the Silicon substrate in SiO₂/SiO₂-TiO₂/SiO₂ rib waveguide. The rib waveguide design techniques using the effective index method are described. The propagation of the two wavelengths through the device is calculated using the computer tools based on the beam propagation method (bpm). The dependence of the device length required for separation of the two wavelengths on the rib waveguide parameters is studied. The waveguide rib width and separation between the parallel waveguides are the parameters those affect the value of the length required for separating the two wavelengths to a greater extent. The guide thickness inside the rib also has considerable effect on the device length. The clad thickness and rib height, however, were found to be the least affecting parameters. The optimization techniques for the rib waveguide and the coupler parameters for achieving the demultiplexing with the minimum length of the device are explained. The proposed fabrication techniques for the SiO₂/SiO₂-TiO₂/SiO₂ rib waveguide are presented.

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D. K. Gautam, Chitrarekha Chaudhari, and L. S. Patil "Design and fabrication of demultiplexers for DWDM applications", Proc. SPIE 4905, Materials and Devices for Optical and Wireless Communications, (29 August 2002); https://doi.org/10.1117/12.480989

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KEYWORDS

Waveguides

Demultiplexers

Wave propagation

Directional couplers

Silicon

Beam propagation method

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