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Unformatted text preview: Find the cut-off frequencies for the TE modes. y ( d, ) = ( 1, ) d x z Figure 2. 3. ( Waveguide Dispersion ) Problem 14.23 in Hayt and Buck, 7 th Ed. (14.15 in 6 th Ed.). 4. ( FEMLAB simulation ) Use FEMLAB (2D In-plane TE waves model) to simulate the wave propagation in a dielectric slab waveguide. The structure of the waveguide is given in Figure 3. The working wavelength is 1550nm. a). Use the uniform and Gaussian E field distributions at the input to excite the fundamental guided mode. Calculate and compare the coupling coefficients of the two cases. Plot the E field. b). Is the TE 2 mode supported? If so, use a proper source to excite it so that the coupling coefficient is better than 90%. Plot the E field. n = 1.5 n = 1 n = 1 1um 10um 30um Figure 3....
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- Spring '05