Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Patent
1992-09-30
1993-06-08
Lee, John D.
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
385126, 385 30, 372 6, 359341, G02B 626
Patent
active
052186652
ABSTRACT:
An optical amplifier for telecommunication lines over which communication signals at a predetermined wavelength are transmitted. The amplifier has portions of two optically coupled fibers, at least one of the fibers being an active fiber, interconnected by a length of active fiber connected to the one fiber of successive portions. Preferably, the active fibers are doped with erbium, and the coupling wavelength of the two fibers is different from the communication signal wavelength so that energy of the spontaneous emission of erbium is transferred from the one fiber to the other fiber and absorbed in the latter permitting amplification of communication signals in a range of wavelengths corresponding to the tolerance range of commercial laser signal emitters.
REFERENCES:
patent: 4546476 (1985-10-01), Shaw et al.
patent: 4742307 (1988-05-01), Thylen
patent: 4883335 (1989-11-01), Alferness et al.
Grasso et al.; Ofc'91 Tech Digest, p. 195; Feb. 1991.
Journal of the Optical Society of America, A/vol. 2, No. 1, Jan. 1985, pp. 84-89.
Grasso Giorgio
Scrivener Paul L.
Lee John D.
Ngo John
Pirelli Cavi S.p.A.
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