Coherent communications in relation to cables involves the transmission of data or signals over an optical fiber. This type of communication system uses laser oscillators at the local and remote ends of the cable to send and receive the signals. The light from the local laser oscillator is mixed with the received signal, and the difference frequency is detected and amplified. The resulting signal is then transmitted along the cable, allowing for accurate and reliable transmission of data.
Coherent communication is more reliable than non-coherent communication as it does not suffer from the same level of noise and distortion. This is because the signal is not affected by the environment, such as temperature and humidity. Furthermore, the signal is not affected by the distance between the local and remote ends of the cable as it is transmitted over the entire length of the cable.
The coherent communication system also provides a much higher data rate compared to non-coherent systems. This is because the signal is transmitted over the entire length of the cable, meaning that a greater amount of data can be transmitted in a shorter period of time. The signal is also much more secure, as it is more difficult for third parties to intercept the data being sent over the cable.
Overall, coherent communication is an efficient and reliable method of data transmission over cables. It provides a higher data rate, better noise immunity, and greater security than non-coherent systems. This makes it an ideal choice for applications that require secure and reliable data transmission.