MCQOPTIONS
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MCQOPTIONS
This section includes 5 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. |
Considering the values given below, calculate the mode separation in terms of free space wavelength for a laser. (Frequency separation = 2GHz, Wavelength = 0.5 m) |
| A. | 1.4 10<sup>-11</sup> |
| B. | 1.6 10<sup>-12</sup> |
| C. | 1 10<sup>-12</sup> |
| D. | 6 10<sup>-11</sup> |
| Answer» C. 1 10<sup>-12</sup> | |
| 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 500 m. |
| 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. | |
| 3. |
A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 m. Determine the number of longitudinal modes. |
| A. | 1 10<sup>2</sup> |
| B. | 3 10<sup>6</sup> |
| C. | 2.9 10<sup>5</sup> |
| D. | 2.2 10<sup>5</sup> |
| Answer» E. | |
| 4. |
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<sup>-13</sup> |
| B. | 1.47 10<sup>-11</sup> |
| C. | 2 10<sup>-12</sup> |
| D. | 1.5 10<sup>-13</sup> |
| Answer» C. 2 10<sup>-12</sup> | |
| 5. |
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 | |