Nokia Certified Network Professional – IP/MPLS Services — Question 24

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

Answer options

• A. These windows correspond to three different minimum and maximum optical power levels used for optical transmission.
• B. These windows are three different wavelength intervals where the WDM optical transmission occurs.
• C. These three windows are three different angles of incidence of the light injected by the laser into the fiber.
• D. Different optical transmission windows correspond to different safety requirements and rules for the related lasers operating with these windows.

Correct answer: B

Explanation

The correct answer is B because the first, second, and third windows refer to specific wavelength intervals used for Wavelength Division Multiplexing (WDM) in optical transmission. Options A, C, and D are incorrect as they do not accurately describe the concept of transmission windows in the context of fiber optics.