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. |
An MQW cascaded laser is more advantageous because of ___________ |
| A. | Mode hopping |
| B. | Auger recombination |
| C. | Control over layers of material |
| D. | Properties of material |
| Answer» D. Properties of material | |
| 2. |
In QC lasers, it is possible to obtain different output signal wavelengths. This can be achieved by ___________ |
| A. | Inter-valence band absorption |
| B. | Mode hopping |
| C. | Quantum cascading |
| D. | Selecting layers of different thickness |
| Answer» E. | |
| 3. |
A QC laser is sometimes referred as ___________ |
| A. | Unipolar laser |
| B. | Bipolar laser |
| C. | Gain guided laser |
| D. | Non semiconductor laser |
| Answer» B. Bipolar laser | |
| 4. |
The phenomenon resulting in the electrons to jump from one state to another each time emitting of photon is known as ___________ |
| A. | Inter-valence band absorption |
| B. | Mode hopping |
| C. | Quantum cascading |
| D. | Quantum confinement |
| Answer» E. | |
| 5. |
In a QC laser, a same electron can emit number of photons. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
A technique based on inter-sub band transition is known as ___________ |
| A. | Auger recombination |
| B. | Frequency chirping |
| C. | Inter-valence band absorption |
| D. | Quantum cascading |
| Answer» E. | |
| 7. |
The diode-cladding-pumped Erbium praseodymium-doped fluoride device operates at wavelength. |
| A. | Around 3 μm |
| B. | 4 μm |
| C. | 2.6 μm |
| D. | 1.04 μm |
| Answer» B. 4 μm | |
| 8. |
The thulium doped fiber laser when pumped with alexandrite laser output at 0.786 μm, the laser emits at ___________ |
| A. | 0.6 μm |
| B. | 0.8 μm |
| C. | 2.3 μm |
| D. | 1.2μm |
| Answer» D. 1.2μm | |
| 9. |
Lasing obtained in __________ when 191 mW of pump light at a wavelength of 0.477 μm is launched into laser. |
| A. | Ternary PbSnSeTe alloy laser |
| B. | Quaternary PbSnSeTe alloy laser |
| C. | Doped Fluoro-zirconate fiber |
| D. | Ternary PbEuTe alloy laser |
| Answer» D. Ternary PbEuTe alloy laser | |
| 10. |
Devices based on quaternary PbSnSeTe and their ternary compounds, emit at wavelength? |
| A. | Between 3-4 μm |
| B. | Longer than 4 μm |
| C. | Between 3.5 to 4.2 μm |
| D. | Between 2 to 3 μm |
| Answer» C. Between 3.5 to 4.2 μm | |
| 11. |
Injection lasers operating in smaller wavelengths are subjected to increased carrier losses. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
The parameters having a major role in determining threshold current of efficiency of injection laser are ___________ |
| A. | Angle recombination and optical losses |
| B. | Frequency chirping |
| C. | Relaxation oscillation |
| D. | Mode hopping |
| Answer» B. Frequency chirping | |
| 13. |
THE_DIODE-CLADDING-PUMPED_ERBIUM_PRASEODYMIUM-DOPED_FLUORIDE_DEVICE_OPERATES_AT_WAVELENGTH.?$ |
| A. | Around 3 μm |
| B. | 4 μm |
| C. | 2.6 μm |
| D. | 1.04 μm |
| Answer» E. | |
| 14. |
A_technique_based_on_inter-sub_band_transition_is_known_as$ |
| A. | Auger recombination |
| B. | Frequency chirping |
| C. | Inter-valence band absorption |
| D. | Quantum cascading |
| Answer» B. Frequency chirping | |
| 15. |
QC lasers ______________ the performance characteristics. |
| A. | Have negligible effects |
| B. | Does not affects |
| C. | Improves |
| D. | Degrades |
| Answer» D. Degrades | |
| 16. |
In QC lasers, it is possible to obtain different output signal wavelengths. This can be achieved by |
| A. | Inter-valence band absorption |
| B. | Mode hopping |
| C. | Quantum cascading |
| D. | Selecting layers of different thickness |
| Answer» D. Selecting layers of different thickness | |
| 17. |
A QC laser is sometimes referred as: |
| A. | Unipolar laser |
| B. | Bipolar laser |
| C. | Gain guided laser |
| D. | Non semiconductor laser |
| Answer» E. | |
| 18. |
The phenomenon resulting in the electrons to jump from one state to another each time emitting of photon is known as : |
| A. | Inter-valence band absorption |
| B. | Mode hopping |
| C. | Quantum cascading |
| D. | Quantum confinement |
| Answer» B. Mode hopping | |
| 19. |
The thulium doped fiber laser when pumped with alexandrite laser output at 0.786 μm, the laser emits a?# |
| A. | 0.6 μm |
| B. | 0.8 μm |
| C. | 2.3 μm |
| D. | 1.2μm |
| Answer» B. 0.8 ‚âà√≠¬¨‚à´m | |
| 20. |
Lasing obtained in __________ when 191 mW of pump light at a wavelength of 0.477 μm is launched into laser.$ |
| A. | Ternary PbSnSeTe alloy laser |
| B. | Quaternary PbSnSeTe alloy laser |
| C. | Doped Fluoro-zirconate fiber |
| D. | Ternary PbEuTe alloy laser |
| Answer» D. Ternary PbEuTe alloy laser | |
| 21. |
Replacing Sn with Eu, Cd or Ge in some _________________ the band gap. |
| A. | Remove the band gap |
| B. | Does not affect |
| C. | Decreases |
| D. | Increases |
| Answer» E. | |
| 22. |
Devices based on quaternary PbSnSeTe and their ternary compounds, emit at wavelength ? |
| A. | Between 3-4 μm |
| B. | Longer than 4 μm |
| C. | Between 3.5 to 4.2 μm |
| D. | Between 2 to 3 μm |
| Answer» C. Between 3.5 to 4.2 ‚âà√≠¬¨‚à´m | |
| 23. |
Injection lasers operating in smaller wavelengths are subjected to increased carrier losses. State whether the following statement is true or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 24. |
Auger current is mostly ___________________ for material with band gap providing longer wavelength emission. |
| A. | Unaffected |
| B. | Lesser |
| C. | Larger |
| D. | Vanishes |
| Answer» D. Vanishes | |
| 25. |
The parameters having a major role in determining threshold current of efficiency of injection laser are: |
| A. | Angle recombination and optical losses |
| B. | Frequency chirping |
| C. | Relaxation oscillation |
| D. | Mode hopping |
| Answer» B. Frequency chirping | |