Metal wave guide to Optical dielectric coupling

Dear all,

I was wondereing if anyone can help me with some info on the best way to design a coupler from a metal waveguide to an optical cable for a W band frequency.

Any suggestions or literature reference would be of great help.

Thank you

There is no way to push a "w-band frequency" into an optical cable. Read a basic textbook on optical fibers and mm-wave waveguides to get some understanding.
Maybe you never heard about wave propagation in various media; learn about it!