Ques.1. Optic fibers are used in:
Ques.2. For a 3-µm-diameter optical fiber with core and cladding indexes of refraction of 1.545 and 1.510, respectively. The cut-off wavelength is.
Ques.3. Which fiber is preferred for long-distance communication?
Ques.4. The maximum angle to the axis at which light may enter the fiber in order to be propagated is referred to as:
Ques.5. Graded index fiber is used to
- Reduce absorption and resulting power loss
- Reduce dispersion and thereby increase the data rate
- Establish secure communication
- Increase the numerical aperture
Ques.6. Find the maximum possible core diameter which allows single-mode operation at a wavelength of 1.3 μm in a graded-index fiber having a parabolic refractive index profile core with core refractive index at the core axis of 1.5 and relative index difference of 1%.
Ques.7. Optical fiber works on the phenomenon of _______
Ques.8. Out of the following, which light is used for optical fiber communication?
Ques.9. In the structure of the fiber optic cable, the refractive index of the core is always ______ the refractive index of the cladding.
Ques.10. Light is confined within the core of an optical fiber due to