Optical Communication Practice Test 3

1. Demountable fiber connectors are more difficult to achieve than optical fiber splices.

2. The expanded beam connectors use ____________ for beam expansion and reduction.

3. The concentricity errors between the fiber core and the outside diameter of the jeweled ferrule are in the range of ___________ with multimode step-index fibers.

4. __________________ in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon.

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

6. The fiber is positioned at the ________ of the lens in order to obtain a collimated beam and to minimize lens-to-lens longitudinal misalignment effects.

7. Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as ____________

8. Optical fiber couplers are also called as ________________

9. The rounding of the fiber ends with a low energy discharge before pressing the fibers together and fusing with a stronger arc is called as ____________

10. A GaAs injection laser has a threshold current density of 2.5*10³Acm^-2 and length and width of the cavity is 240μm and 110μm respectively. Find the threshold current for the device.