Optical waveguides – Optical fiber waveguide with cladding – Utilizing multiple core or cladding
Reexamination Certificate
2005-09-06
2005-09-06
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
Utilizing multiple core or cladding
C398S092000, C398S097000
Reexamination Certificate
active
06941054
ABSTRACT:
An optical fiber transmission link has a first optical fiber with a high effective area coupled to a second, downstream optical fiber with a low effective area. The downstream fiber has non-zero dispersion and low dispersion slope. Characteristics of the upstream fiber permit the launching of high power channels in a wavelength division multiplexing, and characteristics of the downstream fiber enable Raman amplification along that fiber to extend the transmission distance before a need for discrete amplification. The downstream fiber has a non-zero dispersion in the C-band wavelengths and a low dispersion slope and has low attenuation at the signal and pump wavelengths. Refractive-index profiles include variations of W-type fibers that may include outer rings of positive or negative index. Pumping of the downstream fiber may occur either co-directionally to the signals, counter-directionally to the signals, or in both directions.
REFERENCES:
patent: 5191631 (1993-03-01), Rosenberg
patent: 5553185 (1996-09-01), Antos et al.
patent: 5838867 (1998-11-01), Onishi et al.
patent: 5905838 (1999-05-01), Judy et al.
patent: 6751389 (2004-06-01), Tirloni
patent: 0877496 (1998-11-01), None
patent: 0935146 (1999-08-01), None
patent: 0965866 (1999-12-01), None
patent: WO/99/57822 (1999-11-01), None
patent: WO/99/66607 (1999-12-01), None
patent: WO 00/37977 (2000-06-01), None
G. Grasso et al.; “Microbending Losses of Cabled Single Mode Fibres”, ECOC '88, pp. 526-532, 1988.
G. Grasso et al.; “Microbending Effects in Single Mode Fibres”, International Wire and Gable Symposium, pp. 722-731, 1988.
Youichi Akasaka et al., “Enlargement of Effective Core Area On Dispersion-Flattern Fiber and its Low Nonlinearity”, (Thursday Morning), OFC '98 Technical Digest, pp. 302-303 (1998).
Agrawal, “Stimulated Raman Scattering”, Nonlinear Fiber Opics, 2ndedition, pp. 316-369 (1995).
Fludger, Chris et al., “An Analysis of the Improvements in OSNR from Distributed Raman Amplifiers Using Modern Transmission Fibres”, OFC2000, FF2-1, pp. 100-102 (2000).
Ping Wan et al., “Impact of Double Rayleigh Backscatter Noise on Digital and Analog Fiber Systems”, Journal of Lightwave Technology, vol. 14, No. 3, pp. 288-297 (Mar. 1996).
Luc B. Jeunhomme , Single Mode fiber Optics, Basic Theory, Marcel Dekker Inc., pp. 32-38 § 1.3.2, (1990).
M. Nissov et al., “Rayleigh Crosstalk in Long Casades of Distributed Unsaturated Raman Amplifiers”, Electronic Letters, vol. 35, No. 12, pp. 997-998, (Jun. 10, 1999).
P.B. Hansen et al., “Rayleigh Scattering Limitations in Distributed Raman Pre-Amplifiers”, IEEE Photonics Technology Letters, vol. 10, No. 1, pp. 159-161, (Jan. 1998).
L.D. Garett, Field Demonstration of Distributed Raman Amplification with 3.8dB Q-improvement for 5×120km Transmission, OFC2000, pp. 293-295(2000).
Roba Giacomo Stefano
Tirloni Bartolomeo Italo
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Pirelli S.p.A.
Rahll Jerry T
Ullah Akm Enayet
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