Hi
I have a waveguide that is rectangular and multimode that I but-couple to a standard telecom SMF28 fiber. I have imaged the output of the waveguide and the fiber with a 25X microscope objective onto the chip of an IR-camera. Usually the mode overlap is calculated by cross-correlation of the...
Yes, for fibers I can understand that the dispersion is something you want to manage over long distances, but for short waveguides I just don't see much of a point in making it SM. Maybe if you have a SM fiber as input and output with a waveguide in-between it is probably beneficial to have a SM...
I trying to formulate a new project based on waveguides (~1 cm long) for sensing with the evanescent field. In all papers I've seen on similar topics they all aim for single mode (SM) waveguides, but I never understood the reason.
Is there a quick answer?
I know that the signal in a coax is shielded. As I understand the EM waves only induce currents on the outer shield, but why does that not affect the signal in the inner conductor?