Doped fibers
ED44 Series

  • High gain efficiency
  • Broad gain bandwidth
  • Germano-alumino-silicate host glass
This fiber is designed for used in erbium doped fiber amplifiers (EDFAs). This design uses a germano-alumino-silicate host glass and confines the dopant to the central area of the core for optimum amplifier performance. It has a combination of high gain efficiency as well as broad gain bandwidth, making it suitable for a wide range of EDFA applications including CATV and in-line pre-amplifiers.

Efficiency
5dB/mW.
N.A.
0.22
Background loss
10dB/km
Cut-off wavelength
930 nm
Cladding diameter
125 mm
Local dopant concentration
160-200 ppm


This optical fiber is one in a range of rare earth optical fibers available from Oxford Electronics. Other dopant concentrations are available as well as fibers doped with other rare earth materials such as Samarium and Thulium. Doping concentrations up to 1000 ppm are possible.

Graph of absorption around 980
Absorption around the 980 nm pump-band

Graph of absorption around 1530
Absorption around 1530 nm

Graph of fluorescence spectrum
Fluorescence spectrum

Graph of gain against pump-power
Gain against pump-power @ 970 nm

Other doped fibers

Erbium doped fiber with a higher absorption (7.5dB/m) at 980 nm is available (ED9304). The absorption at 1532 nm is 8dB/m. Cut-off wavelength is 840 nm.

We can make single mode doped fibers with most rare earth elements with a doping concentration up to 1000 ppm. Examples include:

Cerium, Terbium, Thulium, Samarium

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Download doped fibers product information PDF.