MCQOPTIONS
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MCQOPTIONS
This section includes 23 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. |
_________________ is a technique used to render the non-conducting material around the active cavity by producing permanent defects in the implanted area. |
| A. | Dispersion |
| B. | Ion de-plantation |
| C. | Ion implantation |
| D. | Attenuation |
| Answer» D. Attenuation | |
| 2. |
The narrow line-width obtained under the CW operation for quarter wavelength shifted DFB laser is ________________ |
| A. | 2 MHz |
| B. | 10 MHz |
| C. | 3 MHz |
| D. | 1 MHz |
| Answer» D. 1 MHz | |
| 3. |
The InGaAsP/InP double channel planar DFB-BH laser with a quarter wavelength shifted first order grating provides a single frequency operation and incorporates a phase shift of ______________ |
| A. | π/2 Radians |
| B. | 2π Radians |
| C. | π Radians |
| D. | 3π/2 radians |
| Answer» B. 2π Radians | |
| 4. |
Fabry-Perot devices with BH geometries high modulation speeds than DFB-BH lasers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
DBF-BH lasers exhibit low threshold currents in the range of ________________ |
| A. | 40 to 50 mA |
| B. | 21 to 30 mA |
| C. | 2 to 5 mA |
| D. | 10 to 20 mA |
| Answer» E. | |
| 6. |
The semiconductor lasers employing the distributed feedback mechanism are classified in _________________ categories. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 7. |
The first order grating (l=1) provide the strongest coupling within the device. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
In the given equation, corrugation period is given by lλb/2Ne. If λb is the Bragg wavelength, then what does ‘l’ stand for? |
| A. | Length of cavity |
| B. | Limitation index |
| C. | Integer order of grating |
| D. | Refractive index |
| Answer» D. Refractive index | |
| 9. |
Conventional cleaved mirror structures are difficult to fabricate with the cavity lengths below __________ |
| A. | 200 μm and greater than 150 μm |
| B. | 100 μm and greater than 50 μm |
| C. | 50 μm |
| D. | 150 μm |
| Answer» D. 150 μm | |
| 10. |
DBF-BH_LASERS_EXHIBIT_LOW_THRESHOLD_CURRENTS_IN_THE_RANGE_OF_________________?$ |
| A. | 40 to 50 mA |
| B. | 21 to 30 mA |
| C. | 2 to 5 mA |
| D. | 10 to 20 mA |
| Answer» E. | |
| 11. |
The InGaAsP/InP double channel planar DFB-BH laser with a quarter wavelength shifted first order grating provides a single frequency operation and incorporates a phase shift of ______________$ |
| A. | π/2 Radians |
| B. | 2π Radians |
| C. | π Radians |
| D. | 3π/2 radians |
| Answer» B. 2‚âà√¨‚àö√ë Radians | |
| 12. |
Fabry-Perot_devices_with_BH_geometries_high_modulation_speeds_than_DFB-BH_lasers._State_whether_the_given_statement_is_true_or_false$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
_________________ is a technique used to render the non-conducting material around the active cavity by producing permanent defects in the implanted area |
| A. | Dispersion |
| B. | Ion de-plantation |
| C. | Ion implantation |
| D. | Attenuation |
| Answer» D. Attenuation | |
| 14. |
Line-width narrowing is achieved in DFB lasers by a strategy referred as _______________ |
| A. | Noise partition |
| B. | Grating |
| C. | Tuning |
| D. | Bragg wavelength detuning |
| Answer» E. | |
| 15. |
The_narrow_line-width_obtained_under_the_CW_operation_for_quarter_wavelength_shifted_DFB_laser_is_________________ |
| A. | 2 MHz |
| B. | 10 MHz |
| C. | 3 MHz |
| D. | 1 MHz |
| Answer» D. 1 MHz | |
| 16. |
The semiconductor lasers employing the distributed feedback mechanism are classified in _________________ categorie? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 17. |
The first order grating (l=1) provide the strongest coupling within the device. State whether the given statement is true or false. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
In the given equation, corrugation period is given by lλb/2Ne. If λb is the Bragg wavelength, then what does ‘l’ stand for?$ |
| A. | Length of cavity |
| B. | Limitation index |
| C. | Integer order of grating |
| D. | Refractive index |
| Answer» D. Refractive index | |
| 19. |
Conventional cleaved mirror structures are difficult to fabricate with the cavity lengths below |
| A. | 200μmand greater than 150 μm |
| B. | 100 μm and greater than 50 μm |
| C. | 50 μm |
| D. | 150 μm |
| Answer» D. 150 ‚âà√≠¬¨‚à´m | |
| 20. |
A method for increasing the longitudinal mode discrimination of an injection laser which is commonly used? |
| A. | Decreasing refractive index |
| B. | Increasing the refractive index |
| C. | Increasing cavity length |
| D. | Shortening of cavity length |
| Answer» E. | |
| 21. |
Which of the following does not provide single frequency operation? |
| A. | Short cavity resonator |
| B. | DSM lasers |
| C. | Coupled cavity resonator |
| D. | Fabry-Perot resonator |
| Answer» E. | |
| 22. |
Device which apply the frequency-selective feedback technique to provide single longitudinal operation are referred to as ________________ |
| A. | DSM lasers |
| B. | Nd: YAG lasers |
| C. | Glass fiber lasers |
| D. | QD lasers |
| Answer» B. Nd: YAG lasers | |
| 23. |
__________________ may be improved through the use of frequency-selective feedback so that the cavity loss is different for various longitudinal modes. |
| A. | Frequency selectivity |
| B. | Longitudinal mode selectivity |
| C. | Electrical feedback |
| D. | Dissipated power |
| Answer» C. Electrical feedback | |