4A0-205 Exam Questions and Answers | Exam-Dumps (Page: 1)

What is the definition of OSNR?

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.

Answer(s): C

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

Answer(s): B

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

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.

Answer(s): B

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

Answer(s): C

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

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.

Answer(s): C

Nokia 4A0-205 Exam (page: 1)
Nokia Optical Networking Fundamentals
Updated on: 11-Dec-2025