The rays concentrated by convex lens is passed through 1m optical fiber. But only the ray enter into optical axis reaches fiber end, other rays are not? Can anyone suggest where i went wrong?
Dear Sathyamoorthy Rajendran , I´m not an expert on Zemax, but after having a look to your fiber design, it is clear that the coat or cladding is acting like a perfect absorber, so any ray that hit it is absorbed. This behaviour doesn´t represent the real phenomenon, the cladding is designed to have a refractive index lower than that of the core, and the working principle is based in total internal reflection, to minimise the losses. Therefore you should tweak these parameters on your design options.
Hope it helps.
It looks as if you designed it in sequential mode. That means ray interaction with surfaces is only checked in the exact order you define the surfaces. If you want to simulate interactions where the order is not known beforehand you must design it in non-sequential mode. Then a model of a multimode waveguide will work, but not a singlemode waveguide, which is poorly described by rays.
Since you are trying all the different critical angles and all are absorbed or diffracted, you need to double-check the refractive index of the cladding vs. the core. If the core is air, any material for the cladding would not work and you need to have a photonic crystal structure around the core to fix this issue.
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