MCQOPTIONS
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MCQOPTIONS
This section includes 6 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. |
If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Determine coupling efficiency into the fiber when GaAs LED is in close proximity to fiber core having numerical aperture of 0.3. |
| A. | 0.9 |
| B. | 0.3 |
| C. | 0.6 |
| D. | 0.12 |
| Answer» B. 0.3 | |
| 3. |
Compute power internally generated within a double-heterojunction LED if it has internal quantum efficiency of 64.5 % and drive current of 40 mA with a peak emission wavelength of 0.82 m. |
| A. | 0.09 |
| B. | 0.039 |
| C. | 0.04 |
| D. | 0.06 |
| Answer» C. 0.04 | |
| 4. |
In a junction diode, an equilibrium condition occurs when ____________ |
| A. | ngreater than p |
| B. | nsmaller than p |
| C. | Constant current flow |
| D. | Optical amplification through stimulated emission |
| Answer» D. Optical amplification through stimulated emission | |
| 5. |
The carrier recombination lifetime becomes majority or injected carrier lifetime. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
The excess density of electrons nand holes pin an LED is ____________ |
| A. | Equal |
| B. | pmore than n |
| C. | n more than p |
| D. | Does not affects the LED |
| Answer» B. pmore than n | |