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. |
The incident optical power required to achieve a desirable SNR is 168.2nW. What is the value of incident power in dBm? |
| A. | -37.7 dBm |
| B. | -37 dBm |
| C. | 34 dBm |
| D. | -38.2 dBm |
| Answer» B. -37 dBm | |
| 2. |
An analog optical fiber system operating at wavelength 1 mhas a post-detection bandwidth of 5MHz. Assuming an ideal detector and incident power of 198 nW, calculate the SNR (f = 2.99 1014Hz). |
| A. | 46 |
| B. | 40 |
| C. | 50 |
| D. | 52 |
| Answer» D. 52 | |
| 3. |
For a given optical fiber communication system, P(e) = 10-9, Zm = 20.7, f = 2.9 1014, = 1. Find the minimum pulse energy or quantum limit. |
| A. | 3.9 10<sup>-18</sup> |
| B. | 4.2 10<sup>-18</sup> |
| C. | 6.2 10<sup>-14</sup> |
| D. | 7.2 10<sup>-14</sup> |
| Answer» B. 4.2 10<sup>-18</sup> | |
| 4. |
A digital optical fiber communication system requires a maximum bit-error-rate of 10-9. Find the average number of photons detected in a time period for a given BER. |
| A. | 19.7 |
| B. | 21.2 |
| C. | 20.7 |
| D. | 26.2 |
| Answer» D. 26.2 | |
| 5. |
The probability of zero pairs being generated when a light pulse is present is given by which of the following equation? |
| A. | P(0/1) = exp(-Z<sub>m</sub>) |
| B. | P(x) = exp (Z<sub>m</sub>) |
| C. | P(y) = x (0) + x(1) |
| D. | P(z) = P(-Z<sub>m</sub>) |
| Answer» B. P(x) = exp (Z<sub>m</sub>) | |
| 6. |
A small leakage current still flows from the device terminals even if there is no optical power incident on the photo detector. |
| A. | True |
| B. | False |
| Answer» B. False | |