External modulation is a process in which the output of a light source is adjusted or altered by an external device, usually a cable. It is a way of manipulating the light so that it can be used for a variety of purposes such as communication, data transfer, or other applications.
Cables are an essential part of external modulation. The cable is used to connect the light source to the external device, allowing the device to adjust the output of the light source. The device can be a stand-alone system or connected to a computer, depending on the application. The cable can be either a single-mode or multimode cable, depending on the desired output from the light source.
Single-mode cables are capable of carrying a single frequency of light and are used for applications that require a high degree of precision. These cables are often used for communication and data transfer. Multimode cables, on the other hand, can carry multiple frequencies of light and are often used for applications that require a large amount of data or information to be transmitted.
External modulation is also used to adjust the intensity of the light output, allowing the light source to be adjusted to the desired level. This can be done by controlling the voltage or current being supplied to the light source, or by controlling the optical components of the device.
External modulation is an important process for the transmission of light and can be used to send and receive data or information, or to adjust the intensity of the light source. The use of cables is essential for this process, as they allow the device to make the necessary adjustments to the light output.