Optical waveguides – With optical coupler – Particular coupling function
Patent
1989-10-06
1991-10-22
Ullah, Akm
Optical waveguides
With optical coupler
Particular coupling function
372 6, 359341, 385 24, G02B 626, G02B 642
Patent
active
050589741
ABSTRACT:
Bidirectional lightwave transmission is restored and uniform amplification of lightwave signals over long spans of optical fiber is achieved by employing distributed amplification over the spans. Distributed amplification is achieved with an amplifying optical fiber which includes a long length of optical fiber having a dilute rare-earth dopant concentration substantially in the fiber core region, and a corresponding pump signal generator at at least one end of the doped fiber having the appropriate wavelength and power to cause amplification of optical signals by both Raman effects and stimulated emission from the rare-earth dopants. Dilute concentrations are understood as the range of concentrations substantially satisfying the condition that the gain from the rare-earth dopant, when near saturation, is substantially equal to the fiber loss.
REFERENCES:
patent: 4546476 (1985-10-01), Shaw et al.
patent: 4699452 (1987-10-01), Mollenauer
patent: 4787927 (1988-11-01), Mears et al.
"High-Gain Erbium-Doped Traveling Wave", by Desurvire et al., Optics Letters, vol. 12, No. 11, Nov. 1987.
Koester et al., Applied Optics, vol. 3, No. 10, Oct. 1964, "Amplification in a Fiber Laser", pp. 1182-1186.
Mollenauer et al., IEEE Journal of Quantum Elec., vol. QE-22, No. 1, Jan. 1986, "Soliton Propagation in Long Fibers with . . . ", pp. 157-173.
Poole et al., J. of Lightwave Tech., vol. LT-4, No. 7, Jul. 1986, "Fabrication and Characterization of Low-Loss . . . ", pp. 870-876.
Desurvire et al., Optics Letters, vol. 12, No. 11, Nov. 1987, "High-Gain Erbium-Doped Traveling-Wave . . . ", pp. 888-890.
AT&T Bell Laboratories
Ranieri Gregory C.
Ullah Akm
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