Optical Communication Mock Test 3

10%

Question 1 of 10

1. The optical power coupled from one fiber to another is limited by ____________

Numerical apertures of fibers

Number of modes propagating in each fiber

Angular power distribution at source

Varying refractive index of fibers

Question 1 of 10

Question 2 of 10

2. In score and break process, which of the following is not used as a cutting tool?

Tungsten carbide

Diamond

Sapphire

Copper

Question 2 of 10

Question 3 of 10

3. The radiation emission process (emission of a proton at frequency) can occur in __________ ways.

One

Four

Three

Two

Question 3 of 10

Question 4 of 10

4. A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.

0.9 dB

1.9 dB

1.4 dB

1.1 dB

Question 4 of 10

Question 5 of 10

5. A four-port FBT coupler has 60μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio?

45%

46%

42%

52%

Question 5 of 10

Question 6 of 10

6. An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2×10¹⁴ Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.

1.5×10^-13

2×10^-12

3×10^-13

1.47×10^-11

Question 6 of 10

Question 7 of 10

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

To achieve lateral alignment less critical than a butt-joined fiber connector

To make a fiber loss free

For index-matching

To make a fiber dispersive

Question 7 of 10

Question 8 of 10

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

0.7 dB

0.2 dB

1.5 dB

0.3 dB

Question 8 of 10

Question 9 of 10

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

Five

One

Three

Two

Question 9 of 10

Question 10 of 10

10. The lower energy level contains more atoms than upper level under the conditions of ________________

Population inversion

Isothermal packaging

Thermal equilibrium

Pumping

Question 10 of 10