Q1: A multimode step index fiber has a numerical aperture of 0.54, core diameter of 50um and a cladding refractive index of 1.4. The LD at 1400nm was used as a source. Find: 1. Number of the modes that are travelling in the fiber. 2. Normalized frequency 3. The launching angle of the third mode of propagation (assume the reflection coefficient phase =0 degree). 4. The acceptance angle of the fiber.
Q1: A multimode step index fiber has a numerical aperture of 0.54, core diameter of 50um and a cladding refractive index of 1.4. The LD at 1400nm was used as a source. Find: 1. Number of the modes that are travelling in the fiber. 2. Normalized frequency 3. The launching angle of the third mode of propagation (assume the reflection coefficient phase =0 degree). 4. The acceptance angle of the fiber.
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Transcribed Image Text:Ql: A multimode step index fiber has a numerical aperture of 0.54,
core diameter of 50µm and a cladding refractive index of 1.4. The
LD at 1400nm was used as a source.
Find:
1. Number of the modes that are travelling in the fiber.
2. Normalized frequency
3. The launching angle of the third mode of propagation (assume
the reflection coefficient phase =0 degree).
4. The acceptance angle of the fiber.
Q2: Calculate the output optical power for 30cm polymer waveguide
if the launched optical power was -3dBm. The total loss for the
waveguide was 30, 33 and 35.8dB for 10, 15 and 20cm waveguide
channels lengths, respectively.
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