An optical communication system uses a transmitter, which encodes a message into an optical signal, a channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal. Optical active products are devices and equipment that actively manipulate, process, or generate optical signals for various applications in telecommunications, data communications, and other fields where optical communication is required. Depending on whether photoelectric conversion occurs during operation, optical devices can be divided into active devices and passive devices. However, these are examined in separate chapters since they constitute major elements in an optical link. From. Common optical active components in optical communications include: semiconductor light sources, semiconductor photodetectors, fiber lasers, optical amplifiers, optical modulators, etc. Batteries recharged by wind or solar energy are beneficial to the network.
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