EDFA: Fiber Amplifiers – Fiber Optic Amplifiers

Fiber Amplifiers - HPOA - THPOA - UHPOA

What is a fiber amplifier?

Fiber amplifiers (fibre amplifiers, fiber optic amplifiers, or fiber laser amplifiers) are optical amplifiers utilizing an optical fiber doped with some rare earth element as the active gain medium, allowing power amplification of an optical signal from a pump laser, for cost-effective light amplification of a low input power laser, or to boost attenuated signal traveling long distances, for example.

Optical power amplification is accomplished through the stimulated emission of photons from the dopant ions in the optical fiber. The pump laser provides the optical signal / signal wavelength, which excites the dopant ions within the amplifier to a higher energy state. When these dopant ions drop back to their lower energy level, they emit photons at the wavelength relevant to the doping agent.

There are a few rare-earth elements used for the doping of optical fibers. Some of the most common dopants are erbium, ytterbium, and thulium.

  • Erbium doped fiber amplifier (EDFA): emits light around 1.5µm in wavelength.
  • Ytterbium-doped fiber amplifier (YDFA): emit light around 1µm in wavelength.
  • Thulium-based amplifier: Erbium-Thulium-Holmium, Thulium-Erbium, and Thulium-doped fiber amplifiers (TDFA) emit light around 2µm in wavelength.

EDFAs are the most widely deployed type of fiber amplifier. This widespread use is mainly due to the the amplification window coinciding with the 3rd transmission window of silica-based optical fiber. A silica fiber’s core is doped with trivalent erbium ions (Er3+), which allows efficient pumping with wavelengths around 980 nm and 1480 nm, and emits high power laser light around 1550 nm. The amplification region for a 1550 nm fiber amplifier typically ranges from a few nm up to ≈ 80 nm.

Image Fiber Amplifier Simple Diagram

Our EDFA Fiber Amplifier Products:

RPMC Lasers Inc. offers a wide variety of fiber-based amplifiers at 1 µm, 1.5 µm (≈ 1550 nm fiber amplifiers), and 2 µm wavelengths, with pulsed or CW capabilities.  Firstly, our advanced line of fiber amplifiers are equipped with up to 40 dBm of output power.  Secondly, our fiber amplifiers possess numerous features, such as low noise, compact package size, and digital control system.  Finally, we also have available SLM configurations with narrow linewidth amplification.

Applications for pulsed and CW fiber laser amplifiers include test and measurement, atom trapping, free space communication, long haul, metro, and access networks, single channel networks.

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FA Series

fa 1.5um 1um 2umRPMC offers a variety of standard and custom fiber amplifiers . Available in both OEM and Turnkey formats, our 1um, 1.5um and 2um fiber amplifiers are manufactured to Telcordia standards and can be modified to meet your applications requirements. With output powers of up to >40dBM, and options such as linear or random polarization, narrow linewidth, low noise, and input and output monitoring, our fiber amplifiers are ideal solutions for applications such as optical transport, FTTH & CATV, RF video overlay, and pulsed amplification. Customized configurations are available upon request.