4. A particular planar waveguide comprises a guiding layer of refractive index equal to 1.454 bound top and bottom by material of refractive index 1.450. a) What is the maximum thickness of this waveguide for single-mode operation at a wavelength of 1550 nm. b) If the thickness of the above waveguide is reduced to 70% of the maximum for single mode operation at 1550 nm, what is the new cut-off wavelength for single-mode operation?

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4. A particular planar waveguide comprises a guiding layer of refractive index equal to 1.454 bound
top and bottom by material of refractive index 1.450.
a) What is the maximum thickness of this waveguide for single-mode operation at a wavelength of
1550 nm.
b) If the thickness of the above waveguide is reduced to 70% of the maximum for single mode
operation at 1550 nm, what is the new cut-off wavelength for single-mode operation?
ANS: a) 7.19 μm and b) 1.08 µm.
Transcribed Image Text:4. A particular planar waveguide comprises a guiding layer of refractive index equal to 1.454 bound top and bottom by material of refractive index 1.450. a) What is the maximum thickness of this waveguide for single-mode operation at a wavelength of 1550 nm. b) If the thickness of the above waveguide is reduced to 70% of the maximum for single mode operation at 1550 nm, what is the new cut-off wavelength for single-mode operation? ANS: a) 7.19 μm and b) 1.08 µm.
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