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Planar Waveguides Michael Moewe EE290F, Professor Kaminow March 2 nd, 2004

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Contents Planar Waveguides Overview Uses Infinitely wide planar waveguide theory Maxwells Equations in Slab Waveguide Simplifcation of Maxwell ’ s Equations TE and TM Mode Wavenumbers & Boundary Conditions Dispersion Curves Power Carried in Waveguide Rectangular Waveguides Marcatili ’ s method of solving & E-field distribution Kumar ’ s method

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Planar Waveguides: Overview Similar function as optical fibers Easily fabricated on substrates with a mask Image from NTT-AT ( )

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Uses for planar waveguides Routing Light Devices Modulators Erbium Doped Planar Waveguide Amplifiers (EDWA) (with curved guides) Resonators

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Maxwells Equations in Slab Waveguide Maxwell ’ s Equations Simplifications

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Simplifcation of Maxwell ’ s Equations Substituting into Maxwell ’ s Equations

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TE and TM Mode TE/TM Mode, No y-axis dependency (and ) TE Mode TM Mode

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Wavenumbers Fields are confined to core, so: With wavenumbers:

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Boundary Conditions H z components continuous at boundaries, so based on previous eq: Continuity of these boundaries gives:

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Substitutions Substitution: Gives the relations:

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Dispersion Curves for TE and TM modes Dispersion Curves

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Power Carried in Waveguide Power Equation Simplifies to (for TE mode):

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Rectangular Waveguides (Marcatili ’ s method) (Assumed no field in corner areas)

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Electric Field Distributions in Rectangular Waveguides Marcatili ’ s Method: (assumes no field in corners of waveguide)

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Kumar ’ s method for Rectangular Waveguides Finite Field in Corners

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References Okamoto K Fundamentals of Optical Waveguides (San Diego, CA: Academic) Prototype trial manufacture of polymer optical waveguide. 2 Mar NTT-AT. at.co.jp/optic2/prd_e0015.htmlhttp://www.keytech.ntt- at.co.jp/optic2/prd_e0015.html Nanonics – Industry Applications. 2 Mar Nanonics. -industry.html -industry.html Syms R., Tate T., Syahriar A. Waveguide Devices by Electron Beam Irradiation of Silica. 2 Mar Imperial College of Science, Technology & Medicine.

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