(1) A Range of wavelengths from 1530 to 1565 nm. In this region, erbium-doped amplifiers (EDFAs) have highest gain. See EDFA and optical bands. (2) A type of Satellite Transmission with less path Loss than other satellite standards such as Ku-band. C-band, however, requires a relatively large antenna. C-band frequencies are shared with terrestrial Microwave transmissions, which can cause Interference with weaker satellite signals in certain areas.