MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
QD lasers have a very low threshold current densities of range __________ |
| A. | 0.5 to 5 A cm<sup>-2</sup> |
| B. | 2 to 10 A cm<sup>-2</sup> |
| C. | 10 to 30 A cm<sup>-2</sup> |
| D. | 6 to 20 A cm<sup>-2</sup> |
| Answer» E. | |
| 2. |
A BH can have anything from a single electron to several electrons. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Dot-in-well device is also known as __________ |
| A. | DH lasers |
| B. | BH lasers |
| C. | QD lasers |
| D. | Gain guided lasers |
| Answer» D. Gain guided lasers | |
| 4. |
Multi-quantum devices have superior characteristics over __________ |
| A. | BH lasers |
| B. | DH lasers |
| C. | Gain guided lasers |
| D. | Single-quantum-well devices |
| Answer» C. Gain guided lasers | |
| 5. |
Better confinement of optical mode is obtained in __________ |
| A. | Multi Quantum well lasers |
| B. | Single Quantum well lasers |
| C. | Gain guided lasers |
| D. | BH lasers |
| Answer» B. Single Quantum well lasers | |
| 6. |
Strip geometry of a device or laser is important. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Quantum well lasers are providing high inherent advantage over __________ |
| A. | Chemical lasers |
| B. | Gas lasers |
| C. | Conventional DH devices |
| D. | BH device |
| Answer» D. BH device | |
| 8. |
Quantum well lasers are also known as __________ |
| A. | BH lasers |
| B. | DH lasers |
| C. | Chemical lasers |
| D. | Gain-guided lasers |
| Answer» C. Chemical lasers | |
| 9. |
Problems resulting from parasitic capacitances can be overcome __________ |
| A. | Through regrowth of semi-insulating material |
| B. | By using oxide material |
| C. | By using a planar InGaAsP active region |
| D. | By using a AlGaAs active region |
| Answer» B. By using oxide material | |
| 10. |
A double-channel planar buried hetero-structure (DCP BH) has a planar active region, the confinement material is? |
| A. | Alga AS |
| B. | InGaAsP |
| C. | GaAs |
| D. | SiO<sub>2</sub> |
| Answer» C. GaAs | |
| 11. |
In Buried hetero-junction (BH) lasers, the optical field is confined within __________ |
| A. | Transverse direction |
| B. | Lateral direction |
| C. | Outside the strip |
| D. | Both transverse and lateral direction |
| Answer» E. | |
| 12. |
Some refractive index variation is introduced into lateral structure of laser. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
What is the strip width of injection laser? |
| A. | 12 m |
| B. | 11.5 m |
| C. | Less than 10 m |
| D. | 15 m |
| Answer» D. 15 m | |
| 14. |
In multimode injection lasers, the construction of current flow to the strip is obtained in structure by __________ |
| A. | Covering the strip with ceramic |
| B. | Intrinsic doping |
| C. | Implantation outside strip region with protons |
| D. | Implantation outside strip region with electrons |
| Answer» D. Implantation outside strip region with electrons | |