What is the wavelength allocation for video distribution in BPON access systems?

The correct allocation for video distribution in BPON (Broadband Passive Optical Networks) access systems is found in the wavelength range from 1550 to 1560 nm. This specific range is designated for downstream transmission, primarily for video services.

The choice of 1550 nm is particularly advantageous because it is within the optimal range for fiber optics, where low attenuation and minimal signal loss occur. This wavelength is well-suited for delivering high-bandwidth video streams over longer distances without significant degradation of quality. In addition to the video content, this wavelength allocation helps in the efficient use of the network by allowing for multiple services to run concurrently over the same optical fiber without interference.

The other options, although they represent specific wavelengths, are not used for video distribution in BPON systems. For example, wavelengths outside the 1550 to 1560 nm range generally serve different purposes, such as upstream communication or monitoring signals within the network. Therefore, the choice of 1550 to 1560 nm is crucial for the effective functioning of broadband services, particularly for video content in those systems.