MCQOPTIONS
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MCQOPTIONS
This section includes 21 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. |
Considering the values given below, calculate the mode separation in terms of free space wavelength for a laser. (Frequency separation = 2GHz, Wavelength = 0.5 μm) |
| A. | 1.4×10-11 |
| B. | 1.6×10-12 |
| C. | 1×10-12 |
| D. | 6×10-11 |
| Answer» C. 1×10-12 | |
| 2. |
An injection laser has active cavity losses of 25 cm-1 and the reflectivity of each laser facet is 30%. Determine the laser gain coefficient for the cavity it has a length of 500μm. |
| A. | 46 cm-1 |
| B. | 51 cm-1 |
| C. | 50 cm-1 |
| D. | 49.07 cm-1 |
| Answer» E. | |
| 3. |
A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 μm. Determine the number of longitudinal modes. |
| A. | 1×102 |
| B. | 3×106 |
| C. | 2.9×105 |
| D. | 2.2×105 |
| Answer» E. | |
| 4. |
__________________ in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon. |
| A. | Light amplification |
| B. | Attenuation |
| C. | Dispersion |
| D. | Population inversion |
| Answer» B. Attenuation | |
| 5. |
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. |
| A. | 3×10-13 |
| B. | 1.47×10-11 |
| C. | 2×10-12 |
| D. | 1.5×10-13 |
| Answer» C. 2×10-12 | |
| 6. |
The frequency of the absorbed or emitted radiation is related to difference in energy E between the higher energy state E2 and the lower energy state E1. State what h stands for in the given equation? |
| A. | Gravitation constant |
| B. | Planck’s constant |
| C. | Permittivity |
| D. | Attenuation constantView Answer |
| Answer» C. Permittivity | |
| 7. |
A device which converts electrical energy in the form of a current into optical energy is called as ___________ |
| A. | Optical source |
| B. | Optical coupler |
| C. | Optical isolator |
| D. | Circulator |
| Answer» B. Optical coupler | |
| 8. |
A_RUBY_LASER_HAS_A_CRYSTAL_OF_LENGTH_3_CM_WITH_A_REFRACTIVE_INDEX_OF_1.60,_WAVELENGTH_0.43_‚ÂÀ√≠¬¨‚À´M._DETERMINE_THE_NUMBER_OF_LONGITUDINAL_MODES.?$# |
| A. | 1√ó10<sup>2 </sup> |
| B. | 3√ó10<sup>6 </sup> |
| C. | 2.9√ó10<sup>5 </sup> |
| D. | 2.2√ó10<sup>5 </sup> |
| Answer» E. | |
| 9. |
Doppler broadening is a homogeneous broadening mechanism. State whether the given statement is true or false.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
A_semiconductor_laser_crystal_of_length_5_cm,_refractive_index_1.8_is_used_as_an_optical_source._Determine_the_frequency_separation_of_the_modes.$ |
| A. | 2.8 GHz |
| B. | 1.2 GHz |
| C. | 1.6 GHz |
| D. | 2 GHz |
| Answer» D. 2 GHz | |
| 11. |
Considering the values given below, calculate the mode separation in terms of free space wavelength for a laser. |
| A. | |
| B. | |
| Answer» C. | |
| 12. |
Longitudinal modes contribute only a single spot of light to the laser output. State whether the given statement is true or false. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
An_injection_laser_has_active_cavity_losses_of_25_cm-1and_the_reflectivity_of_each_laser_facet_is_30%._Determine_the_laser_gain_coefficient_for_the_cavity_it_has_a_length_of_500μm.$ |
| A. | 46 cm<sup>-1</sup> |
| B. | 51 cm<sup>-1</sup> |
| C. | 50 cm<sup>-1</sup> |
| D. | 49.07 cm<sup>-1</sup> |
| Answer» E. | |
| 14. |
__________________ in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon? |
| A. | Light amplification |
| B. | Attenuation |
| C. | Dispersion |
| D. | Population inversion |
| Answer» B. Attenuation | |
| 15. |
The lower energy level contains more atoms than upper level under the conditions of ________________ |
| A. | Isothermal packaging |
| B. | Population inversion |
| C. | Thermal equilibrium |
| D. | Pumping |
| Answer» D. Pumping | |
| 16. |
An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2√ó1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.$ |
| A. | 3√ó10<sup>-13 </sup> |
| B. | 1.47√ó10<sup>-11 </sup> |
| C. | 2√ó10<sup>-12 </sup> |
| D. | 1.5√ó10<sup>-13 </sup> |
| Answer» C. 2‚Äö√†√∂‚àö‚â•10<sup>-12 </sup> | |
| 17. |
Which process gives the laser its special properties as an optical source? |
| A. | Dispersion |
| B. | Stimulated absorption |
| C. | Spontaneous emission |
| D. | Stimulated emission |
| Answer» E. | |
| 18. |
The radiation emission process (emission of a proton at frequency) can occur in __________ ways. |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | One |
| Answer» B. Three | |
| 19. |
The frequency of the absorbed or emitted radiation is related to difference in energy E between the higher energy state E2 and the lower energy state E1. State what h stands for in the given equation? |
| A. | |
| B. | Gravitation constant |
| C. | Planck’s constant |
| Answer» C. Planck‚Äö√Ñ√∂‚àö√ë‚àö¬•s constant | |
| 20. |
How many types of sources of optical light are available? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 21. |
A device which converts electrical energy in the form of a current into optical energy is called as |
| A. | Optical source |
| B. | Optical coupler |
| C. | Optical isolator |
| D. | Circulator |
| Answer» B. Optical coupler | |