optical fibers

Thread Starter

Ashraf Ali

Joined Nov 2, 2007
i have a small query in optical fibers. . .

optical fibers employ the total internal reflection [TIR] to propagate the wave thro them . . and TIR occurs only when the angle of incidence is less than that of critical angle . .
my doubt is when angle of incidence = critical angle then the wave travels thro the interface between the two mediums .. what happens to the energy of the wave . . where does it go as the light doesn't emerge thro the other end of the fiber
if we pass some light at one end and all light is lost(no light at receiving end)
then there can be many ways like energy is reflected back due to improper bending of fiber or backscattering, lost in cladding.
i suggest you to read something about optical fiber as these are common topics. you will find them in many books.