اسئلة على fiber optics


(system) #1

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  1. A graded index fiber has a core with a parabolic refractive index profile which has a
    diameter of 60μm.the fiber has numerical aperture of 0.4.estimate the total number of
    guided modes propagating in the fiber when it is operating at a wavelength of 2μm.

  2. Determine the cutoff wavelength for a step index fiber to exhibit single mode
    operation when the core refractive index and radius are 2.46 and 5.6μm, respectively,
    with the relative index difference being 0.35%.

  3. When the mean optical power launched into an 10km length of fiber is 150μw, the
    mean optical power at the fiber output is 5μw.determine the followings:
    a. The overall signal loss in decibel through the fiber assuming no connecters or splices.
    b. The signal attenuation per kilometer for the fiber.