Besides optical amplifiers, modern optical networks also require other components to be place along the link, such as the Dispersion Compensation Module (DCM) used to correct signal distortion due to Chromatic Dispersion of the transmission fiber. Since the attenuation of DCM can be quite large, in the range of 5 to 10 dB, additional amplification […]
EDFA amplifier
Variable Gain EDFA – Large Dynamic Gain Range & Better Noise Figure Performance
In order to support different span lengths between Optical Amplifiers in a transmission link, as well as to provide for aging of the link, it is desirable for an optical amplifier to support as large as possible dynamic gain range, i.e. to allow the gain to be dynamically configured over a wide range. For a […]
Passive Optical Amplifiers: EDFA, SOA and RFA
As optical signals travel through an optical fiber, they are attenuated. In long-haul applications, the signal is attenuated to the point where re-amplification is required. Traditionally, a device commonly referred to as a repeater accomplished this re-amplification. A repeater is basically a receiver and transmitter combined in one package. The receiver converts the incoming optical […]
Optical Active Devices Categories Introduction
In fiber optic networks, optical active devices are key components. It can convert electrical signals and optical signals to each other, the optical transmission system of the heart. Optical active devices are divided into the following three categories. A. Light Source The device that converts electrical signal into optical signal is called light source. The […]