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

1. The dominating effect of thermal noise over the shot noise in photodiodes without internal gain can be observed in wideband systems operating in the range of ________
2. Compute wavelength of RAPD with 70% efficiency and Responsivity of 0.689 A/w.
3. Compute photocurrent of RAPD having optical power of 0.7 μw and responsivity of 0.689 A/W.
4. APDs do not operate at signal wavelengths between 1.3 and 1.6μm.
5. __________________ always leads to the generation of a hole and an electron.
6. Often __________ pulse shape is obtained from APD.
7. Determine Responsivity of a silicon RAPD with 80% efficiency, 0.7μm wavelength.
8. ______________ is caused due to thermal interaction between the free electrons and the vibrating ions in the conduction medium.
9. _____________ refers to any spurious or undesired disturbances that mask the received signal in a communication system.
10. _______ is fully depleted by employing electric fields.
11. In the equation given below, what does τstands for?Zm = ηP0τ/hf
12. Electric field in the depletion region should be high.
13. The photocurrent of an optical detector should be __________
14. ____________ is dependent upon the detector material, the shape of the electric field profile within the device.
15. __________ determines a higher transmission rate related to the gain of the APD device.
16. A photodiode has a capacitance of 6 pF. Calculate the maximum load resistance which allows an 8MHz post detection bandwidth.
17. Determine the Responsivity of optical power of 0.4μW and photocurrent of 0.294 μA.
18. How many types of optical detectors are available?
19. Which are the two main sources of noise in photodiodes without internal gain?
20. 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.
21. A small leakage current still flows from the device terminals even if there is no optical power incident on the photo detector.
22. ___________ has more sophisticated structure than p-i-n photodiode.
23. 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.
24. The probability of zero pairs being generated when a light pulse is present is given by which of the following equation?
25. For silicon APDs, the value of excess noise factor is between _________

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