Which statement is true about optical nodes?

The statement that optical nodes contain four main sections, including the optical receiver, accurately reflects the complexity and functionality of these devices in fiber optic communication systems. Optical nodes typically consist of multiple components that enable them to perform their primary functions, including receiving, amplifying, and transmitting optical signals.

The four main sections typically include:

1. Optical Receiver: This part is crucial for converting incoming optical signals into electrical signals, which can then be processed and sent to their destination.

2. Optical Transmitter: In addition to receiving signals, many optical nodes also contain transmitters that convert electrical signals back into optical signals for broadcasting.

3. Power Supply: A reliable power supply is necessary to ensure that the node operates efficiently and maintains performance levels across various conditions.

4. Control and Management Section: This consists of circuitry that manages the data flow, maintenance, and overall operation of the optical node.

Recognizing the key components of optical nodes is essential for understanding how they facilitate communication across different network types, whether short or long-distance. The other statements do not accurately reflect the complete structure or functionality of optical nodes, focusing instead on incomplete or misleading aspects of their design or application.