MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
Determine CW operating lifetime for LED with rt = -0.58 and degradation rate r = 7.86*10-11 h-1. |
| A. | 32.12 |
| B. | 42 |
| C. | 22.72 |
| D. | 23.223 |
| Answer» D. 23.223 | |
| 2. |
Determine degradation rate rif constant junction temperature is 17 degree celsius. |
| A. | 7.79*10<sup>-11</sup> |
| B. | 7.91*10<sup>-11</sup> |
| C. | 6.86*10<sup>-11</sup> |
| D. | 5.86*10<sup>-11</sup> |
| Answer» B. 7.91*10<sup>-11</sup> | |
| 3. |
The 3 dB electrical bandwidth B is 42 MHz. Determine 3dB optical bandwidth Bopt. |
| A. | 45.18 |
| B. | 59.39 |
| C. | 78.17 |
| D. | 94.14 |
| Answer» C. 78.17 | |
| 4. |
The optical power at 20 MHz is 246.2 W. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. |
| A. | 3.48*10<sup>-4 </sup> |
| B. | 6.42*10<sup>-9</sup> |
| C. | 1.48*10<sup>-3</sup> |
| D. | 9.48*10<sup>-12</sup> |
| Answer» B. 6.42*10<sup>-9</sup> | |
| 5. |
When a constant d.c. drive current is applied to device, the optical o/p power is 320 m. Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. 5ns. |
| A. | 4.49*10<sup>-12</sup> |
| B. | 6.84*10<sup>-9</sup> |
| C. | 1.29*10<sup>-6</sup> |
| D. | 2.29*10<sup>-4</sup> |
| Answer» E. | |
| 6. |
The optical 3 dB point occurs when currents ratio is equal to _____________ |
| A. | ( frac{8}{3} ) |
| B. | ( frac{2}{2} ) |
| C. | ( frac{1}{2} ) |
| D. | ( frac{3}{4} ) |
| Answer» D. ( frac{3}{4} ) | |
| 7. |
The active layer composition must be adjusted if a particular center wavelength is desired. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Linearizing circuit techniques are used for LEDs. |
| A. | True |
| B. | False |
| Answer» B. False | |