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Optical Communication: Optical Detectors
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Optical Communication: Optical Detectors
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25 Questions

1. 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.
2. Compute photocurrent of RAPD having optical power of 0.7 μw and responsivity of 0.689 A/W.
3. Often __________ pulse shape is obtained from APD.
4. ___________ has more sophisticated structure than p-i-n photodiode.
5. __________ determines a higher transmission rate related to the gain of the APD device.
6. For a given optical fiber communication system, P(e) = 10-9, Zm = 20.7, f = 2.9×1014, η = 1. Find the minimum pulse energy or quantum limit.
7. _____________ refers to any spurious or undesired disturbances that mask the received signal in a communication system.
8. A silicon p-i-n photodiode incorporated in an optical receiver has following parameters: Quantum efficiency = 70% Wavelength = 0.8 μm Dark current = 3nA Load resistance = 4 kΩ Incident optical power = 150nW. Bandwidth = 5 MHz. Compute the photocurrent in the device.
9. The photocurrent of an optical detector should be __________
10. A small leakage current still flows from the device terminals even if there is no optical power incident on the photo detector.
11. How many types of noise are observed because of the spontaneous fluctuations in optical fiber communication systems?
12. Determine the output current of RAPD having multiplication factor of 39 and photocurrent of 0.469μA.
13. ___________ distribution provides the description the random statistics of light emitted in black body radiation.
14. An analog optical fiber system operating at wavelength 1μmhas a post-detection bandwidth of 5MHz. Assuming an ideal detector and incident power of 198 nW, calculate the SNR (f = 2.99×1014Hz).
15. Compute the photocurrent of RAPD having multiplication factor of 36.7 and output current of 7μA.
16. Which are the two main sources of noise in photodiodes without internal gain?
17. ______________ is caused due to thermal interaction between the free electrons and the vibrating ions in the conduction medium.
18. _______ is fully depleted by employing electric fields.
19. In a silicon p-i-n photodiode, if load resistance is 4 kΩ, temperature is 293 K, bandwidth is 4MHz, find the thermal noise in the load resistor.
20. APDs do not operate at signal wavelengths between 1.3 and 1.6μm.
21. Compute multiplication factor of RAPD with output current of 10 μAand photocurrent of 0.369μA.
22. The internal gain mechanism in an APD is directly related to SNR. State whether the given statement is true or false.
23. The incident optical power required to achieve a desirable SNR is 168.2nW. What is the value of incident power in dBm?
24. Fall times of 1 ns or more are common.
25. Determine the Responsivity of optical power of 0.4μW and photocurrent of 0.294 μA.

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