Optical Communication Practice Test 3

1. In the given equation, if r is the radial distance, n is the refractive index; what does z stands for?

dr2/dz2 = (1/n) (d n/dr)

2. What is the use of interposed optics in expanded beam connectors?

3. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33μm.

4. Which of the following factors does not cause divergence of the collimated beam from a GRIN-rod lens?

5. A graded index fiber has a parabolic refractive index profile (α=2) and core diameter of 42μm. Estimate an insertion loss due to a 2 μm lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only.

6. Lens-coupled expanded beam connectors exhibit average losses of _________ in case of single mode and graded index fibers.

7. The basic ferrule connector is also called as _____________

8. Two joined graded index fibers that are perfectly aligned have refractive indices α_R = 1.93 for receiving fiber α_E = 2.15 for emitting fiber. Calculate the coupling loss.

9. How many types of misalignments occur when joining compatible fiber?

10. How many types of sources of optical light are available?