Question

2.7 Consider a dielectric slab waveguide that has a thin GaAs layer of thickness 0.2 μm Dielectric slab waveguide between two AlGaAs layers. The refractive index of GaAs is 3.66 and that of the AlGaAs layers is 3.40. What is the cutoff wavelength beyond which only a single mode can propagate in the waveguide, assuming that the refractive index does not vary greatly with the wavelength? If a radiation of wavelength 870 nm (corresponding to bandgap radiation) is propagating in the GaAs layer, what is the penetration of the evanescent wave into the AlGaAs layers? What is the mode field width (MFW) of this radiation?

2.7 Optoelectronics and Photonics

Answer 1

4 solutions Gve dała ial wave utde Consider a derechư A bfelechic stat wave engdh thed has a thin is mode oth

The cut- o wave length Ts 65um S70 10 operation