MCQOPTIONS
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MCQOPTIONS
This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communication knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Y3Al5 O12 is a molecular formula for _____________ |
| A. | Ytterbium aluminate |
| B. | Yttrium oxide |
| C. | Ytterbium oxy-aluminate |
| D. | Yttrium-aluminum garnet |
| Answer» E. | |
| 2. |
In Fabry-perot laser, the lower threshold is obtained by ___________ |
| A. | Increasing the refractive index |
| B. | Decreasing the refractive index |
| C. | Reducing the slope efficiency |
| D. | Increasing the slope efficiency |
| Answer» D. Increasing the slope efficiency | |
| 3. |
The lasing output of the basic Fabry-perot cavity fiber is restricted to between ____________ |
| A. | 1 and 2 nm |
| B. | 5 and 10 nm |
| C. | 3 and 6 nm |
| D. | 15 and 30 nm |
| Answer» C. 3 and 6 nm | |
| 4. |
_______________ fibers include addition of lead fluoride to the core glass in order to raise the relative refractive index. |
| A. | Solid-state |
| B. | GaAs |
| C. | Semiconductor |
| D. | ZBLANP |
| Answer» E. | |
| 5. |
Dopants levels in glass fiber lasers are generally ___________ |
| A. | Low |
| B. | High |
| C. | Same as that of GRIN rod lens laser |
| D. | Same as that of semiconductor laser |
| Answer» B. High | |
| 6. |
Which of the following co-dopant is not employed by neodymium and erbium doped silica fiber lasers? |
| A. | Phosphorus pent oxide |
| B. | Germania |
| C. | Nitrogen |
| D. | Alumina |
| Answer» D. Alumina | |
| 7. |
In a three level system, the threshold power decreases inversely with the length of the fiber gain medium. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
It is a resonant cavity formed by two parallel reflecting mirrors separated by a mirror separated by a medium such as air or gas is? |
| A. | Optical cavity |
| B. | Wheatstone’s bridge |
| C. | Oscillator |
| D. | Fabry-perot resonator |
| Answer» E. | |
| 9. |
The Nd: YAG laser is costlier than earth-doped glass fiber laser. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
____________________ lasers are presently the major laser source for optical fiber communications. |
| A. | Semiconductor |
| B. | Non-Semiconductor |
| C. | Injection |
| D. | Solid-state |
| Answer» D. Solid-state | |
| 11. |
WHICH_OF_THE_FOLLOWING_CO-DOPANT_IS_NOT_EMPLOYED_BY_NEODYMIUM_AND_ERBIUM_DOPED_SILICA_FIBER_LASERS??$ |
| A. | Phosphorus pent oxide |
| B. | Germania |
| C. | Nitrogen |
| D. | Alumina |
| Answer» D. Alumina | |
| 12. |
_______________ fibers include addition of lead fluoride to the core glass in order to raise the relative refractive index.$ |
| A. | Solid-state |
| B. | GaAs |
| C. | Semiconductor |
| D. | ZBLANP |
| Answer» E. | |
| 13. |
Dopants_levels_in_glass_fiber_lasers_are_generally____________$ |
| A. | Low |
| B. | High |
| C. | Same as that of GRIN rod lens laser |
| D. | Same as that of semiconductor laser |
| Answer» B. High | |
| 14. |
Y3Al5 O12 Is a molecular formula for _____________ |
| A. | Ytterbium aluminate |
| B. | Yttrium oxide |
| C. | Ytterbium oxy-aluminate |
| D. | Yttrium-aluminum garnet |
| Answer» E. | |
| 15. |
When did the non-semiconductor laser developed? |
| A. | 1892 |
| B. | 1946 |
| C. | 1985 |
| D. | 1993 |
| Answer» D. 1993 | |
| 16. |
In Fabry-perot laser, the lower threshold is obtained by |
| A. | Increasing the refractive index |
| B. | Decreasing the refractive index |
| C. | Reducing the slope efficiency |
| D. | Increasing the slope efficiency |
| Answer» D. Increasing the slope efficiency | |
| 17. |
The_lasing_output_of_the_basic_Fabry-perot_cavity_fiber_is_restricted_to_between_____________ |
| A. | 1 and 2 nm |
| B. | 5 and 10 nm |
| C. | 3 and 6 nm |
| D. | 15 and 30 nm |
| Answer» C. 3 and 6 nm | |
| 18. |
In a three level system, the threshold power decreases inversely with the length of the fiber gain medium. State whether the given statement is true or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
It is a resonant cavity formed by two parallel reflecting mirrors separated by a mirror separated by a medium such as air or gas |
| A. | Optical cavity |
| B. | Wheatstone’s bridge |
| C. | Oscillator |
| D. | Fabry-perot resonator |
| Answer» E. | |
| 20. |
The Nd: YAG laser is costlier than earth-doped glass fiber laser. State whether the following statement is true or false |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
The strongest pumping bands is a four level system of Nd: YAG laser at wavelength of range_________________ |
| A. | 0.25 and 0.56 nm |
| B. | 0.75 and 0.81 nm |
| C. | 0.12 and 0.23 nm |
| D. | 1 and 2 nm |
| Answer» C. 0.12 and 0.23 nm | |
| 22. |
The Nd: YAG laser has a narrow line-width which is ________________ |
| A. | < 0.01 nm |
| B. | > 0.01 nm |
| C. | > 1 mm |
| D. | > 1.6 mm |
| Answer» B. > 0.01 nm | |
| 23. |
Which of the following is not a property of Nd: YAG laser that enables its use as an optical fiber communication source? |
| A. | Single mode operation |
| B. | Narrow line-width |
| C. | Long lifetime |
| D. | Semiconductors and integrated circuits |
| Answer» E. | |
| 24. |
In Nd: YAG lasers, the maximum doping levels of neodymium is ____________ |
| A. | 0.5 % |
| B. | 1.5 % |
| C. | 1.8 % |
| D. | 2 % |
| Answer» C. 1.8 % | |
| 25. |
____________________ lasers are presently the major laser source for optical fiber communications |
| A. | Semiconductor |
| B. | Non-Semiconductor |
| C. | Injection |
| D. | Solid-state |
| Answer» D. Solid-state | |