C-Band is a wavelength range of around 1530 to 1565 nm that is used for fiber optic cables. This wavelength range is used for erbium-doped fiber amplifiers, which have their highest gain in this range. This range is also known as the CWDM (Coarse Wavelength Division Multiplexing) or DWDM (Dense Wavelength Division Multiplexing) range, and is used to combine multiple signals onto a single fiber.

In a fiber optic system, the C-Band is the backbone of the entire system. The optical signals that travel through the fiber optic cables are usually in the C-band range, and the components used to transmit and receive them are designed to operate in this range. The C-Band allows for a variety of services and applications, such as data transmission, voice, and video.

The C-Band is also used in fiber optic connectors that can be used to join two optical fibers together. These connectors are designed to provide a secure connection that is able to handle the high power levels of the C-Band optical signals. This is important because these signals can be very delicate and can be easily damaged by an improper connection.

The C-Band is an important part of fiber optic technology and its use is increasing due to the rapid growth of the internet and other digital communications. The C-Band is also used in other applications, such as telecommunications and broadcasting. With its wide range of applications, the C-Band is a key component in the development and utilization of fiber optics.