Telecommunications system having fiber optical amplifiers for tr

Details Telecommunications system having fiber optical amplifiers for tr Telecommunications system having fiber optical amplifiers for tr

1992-04-22

1993-10-05

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359343, 372 6, H01S 330, H01S 306, G02C 626

Patent

active

052510611

ABSTRACT:
A telecommunications system having erbium-doped fiber optical amplifiers for transmitting signals including at least one signal at a wavelength of about 1550 nm, wherein the amplifiers are fibers whose cores are doped with erbium and germanium and are free from aluminum; and wherein for each of the amplifiers, the length of the fiber and the pumping power which is injected therein are such that the noise generated by the fiber is generally emitted around 1550 nm. As can be seen in FIG. 4 , the signal-to-noise ratio remains satisfactory after 10,000 km of propagation without using an intermediate filter.

REFERENCES:
patent: 4595837 (1990-09-01), Fevrier et al.
patent: 5067789 (1991-11-01), Hall et al.
patent: 5087108 (1992-02-01), Grasso et al.

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