(1.3) The complex dielectric constant of the semicon-8.92 +ductor cadmium telluride is given by eri 2.29 at 500 nm. Calculate for CdTe at this wave-length: the phase velocity of light, the absorptioncoefficient and the reflectivity.(1.4) The detectors used in optical fibre networks op-erating at 850 nm are usually made from silicon,which has an absorption coefficient of 1.3×105 m¯¹at this wavelength. The detectors have coatings onthe front surface that makes the reflectivity at thedesign wavelength negligibly small. Calculate thethickness of the active region of a photodiode de-signed to absorb 90% of the light.

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The complex dielectric constant of the semicon- ductor cadmium telluride is given by er = 8.92 + i 2.29 at 500 nm. Calculate for CdTe at this wave- length: the phase velocity of light, the absorption coefficient and the reflectivity.