The erbium ions are optically pumped to a higher energy level (typically using a laser at a wavelength of 980nm or 1480nm), and when the incoming optical signal passes through the doped fiber, it stimulates the excited erbium ions to drop to a lower energy level, emitting. The erbium ions are optically pumped to a higher energy level (typically using a laser at a wavelength of 980nm or 1480nm), and when the incoming optical signal passes through the doped fiber, it stimulates the excited erbium ions to drop to a lower energy level, emitting. Definition: Optical amplifier is a device used in an optical communication system to directly amplify (boost) optical data signal without changing it into its electrical form. By making use of Optical amplifiers in optical fiber communication, the optical integrity of the whole system is retained. An optical amplifier is a device that amplifies an optical signal directly, without the. An optical amplifier amplifies light as it is without converting the optical signal to an electrical signal, and is an extremely important device that supports the long-distance optical communication networks of today. There are 2. E ( t ) + n ( t ) Booster (power) amplifiers: Boost power into transmission fiber, low NF, high Psat. An illustration of the effective gainis given below. Note the presence of a gain peak around 1530nm and. An optical amplifier is a device which receives some input signal light and generates an output signal with higher optical power.