i) Numerical aperture
ii) Maximum acceptance angle.
2. Consider a fiber in air with m₁ = 1.53, n₂ = 1.50. Calculate numerical aperture and critical
angle.
3. For a fiber with glass core m = 1.5 and fused quartz cladding n₂ = 1.46, determine the
critical angle (oc), acceptance angle on and numerical aperture for source to fiber medium
no = 1.
4. A multimode step index fiber with a core refractive index of 1.4917 and that of cladding
1.4894 micrometre and wavelength of 1.3 micrometre.
Calculate -
i) Numerical aperture
ii) Critical angle of core cladding interface
iii) Number of modes.
5. The numerical aperture for a fiber is 0.352 and core diameter is 50 µm with light wavelength
of 0.8 μm. Calculate number of modes.
Fig: 1