Explain why it is easier to make a single-mode waveguide in a symmetric three-layer waveguide than it is in an asymmetric three-layer waveguide. (a) What is an “optical stripline”? (b) Using the...

Explain why it is easier to make a single-mode waveguide in a symmetric

three-layer waveguide than it is in an asymmetric three-layer waveguide.

(a) What is an “optical stripline”?

(b) Using the ray-optic approach, sketch the propagation of a lightwave in a

strip-loaded waveguide like that shown in Fig. 3.6.