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Practice Nokia 4A0-205 Exam Questions

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  Total 40 Questions
Question No 1

What is the definition of OSNR?

Choose the Choices:

The OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.

The OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.

The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

The OSNR is defined as the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.

C
Question No 2

Which of the following are the main reasons for fiber attenuation?

Choose the Choices:

Refraction and reflection

Scattering and absorption

Chromatic dispersion (CD) and polarization mode dispersion

Small channel spacing

B
Question No 3

What is the meaning of first, second, and third window in the optical fiber propagation context?

Choose the Choices:

These windows correspond to three different minimum and maximum optical power levels used for optical transmission.

These windows are three different wavelength intervals where the WDM optical transmission occurs.

These three windows are three different angles of incidence of the light injected by the laser into the fiber.

Different optical transmission windows correspond to different safety requirements and rules for the related lasers operating with these windows.

B
Question No 4

In which window(s) does the attenuation reach its minimum peak?

Choose the Choices:

First window (850 nm)

Second window (1300 nm)

Third window (1550 nm)

Both first and second windows

C
Question No 5

Which of the following statements is true about chromatic dispersion (CD)?

Choose the Choices:

Different channels have different bandwidth and this causes different CD performances.

The fiber attenuation changes along the fiber, and when the light crosses these differences the CD takes place.

Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed.

The fiber attenuation introduces inter - channel interference.

C
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