Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-01-30
2000-11-07
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359345, H01S 300
Patent
active
061444863
ABSTRACT:
The variables and parameters previously understood to affect the gain spectrum of an optical amplifier 13 were: (1) the wavelengths to be amplified; (2) the input power levels at those wavelengths; (3) the characteristics of the amplifying medium 20; (4) the insertion loss spectra of the amplifier's components, including any filter(s) used for gain flattening; (5) the pump band chosen to pump the amplifying medium 20; and (6) the total amount of pump power supplied in the chosen pump band. An additional fundamental variable has been identified which can be used to control the gain spectrum of an optical amplifier 13, namely, the center wavelength of the spectrum of the pump's output power within the chosen pump band. Methods and apparatus for using this variable for this purpose are disclosed.
For example a, transmission system is disclosed having a transmitter 11 and a receiver 10 connected by an optical fiber 12. A plurality of optical amplifiers 13 are located along the optical fiber 12 to amplify signal channels between the transmitter and receiver. Each of the amplifiers has a pump light source 21, the wavelength of which is such that contributions to differential gain due to pump light wavelength related effects is substantially reduced.
Also disclosed is a WDM transmission system having a transmission path including a concatenation of laser diode pumped optical amplifiers 13 wherein the gain spectrum of an amplifier is controlled at least in part by a feedback loop regulating the temperature of its laser diode pump 21. The feedback loop may for instance derive its control signal from a measure of the drive current applied to the pump, of the emission wavelength of the pump, or of the disparity between the power output from the amplifier in one of the multiplexed signal channels and that from at least one other of the channels.
REFERENCES:
patent: 5260823 (1993-11-01), Payne et al.
patent: 5287216 (1994-02-01), Chirravuri et al.
patent: 5333089 (1994-07-01), Heidemann
patent: 5363385 (1994-11-01), Heidemann
patent: 5406404 (1995-04-01), DiGiovanni et al.
patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5696615 (1997-12-01), Alexander
patent: 5745283 (1998-04-01), Inagaki et al.
Becker et al., Erbium-Doped Fiber Amplifier pumped in the 950-1000 nm Region, IEEE Photonics Technology Letters, vol. 2, No. 1, Jan. 1990, pp. 35-37.
Lidgard et al., Output saturation characteristics of erbium-doped fiber amplifiers pumped at 975 nm, Applied Physics letter 56 (26), pp. 2607-2609.
Giles et al., Modeling Erbium-Doped Fiber Amplifiers, Journal of Lightwave Technology, vol. 9, No. 2, Feb. 1991, pp. 271-283.
Giles et al., Optical Amplifiers Transform Long-Distance Lightwave Telecommunications, Proceedings of the IEEE, vol. 84, Jun. 1996, pp. 870-883.
Tachibana et al., Gain cross saturation and spectral hole burning in wideband erbium-doped fiber amplifiers, Optics Letters, Oct. 1, 1991, vol. 16, pp. 1499-1501.
Chou et al., Inhomogeneous Gain Saturation of Erbium-Doped Fiber Amplifiers, Proceedings, Optical Amplifiers and their Application, Davos, Switzerland, 1995, pp. 92-95.
Srivastava et al., Room temperature spectral hole-burning in erbium-doped fiber amplifiers, Proceedings, Optical Fiber Communication Conference, San Jose, CA, 1996 (TuG7), pp. 33-34.
Desurvire et al., Spectral Gain Hole-Burning at 1.53.mu.m in Erbium-Doped Fiber Amplifiers, IEEE Photonics Technology Letters, vol. 2, No. 4, Apr. 1990, pp. 246-248.
Zyskind et al., Determination of Homogeneous Linewidth by Spectral Gain Hole-Burning in an Erbium-doped Fiber Amplifier with GeO.sub.2 :SiO.sub.2 Core, IEEE Photinics Technology Letters, vol. 2, No. 12, Dec. 1990, pp. 869-871.
Desurvire et al., Study of Spectral Dependence of Gain Saturation and Effect of Inhomogenous Broadening in Erbium-Doped Aluminosilicate Fiber Amplifiers, IEEE Photonics Technology Letters, vol. 2, No. 9, Sep. 1990, pp. 653-655.
Yoshikuni et al., Multielectrode Distributed Feedback Laser for Pure Frequency Modulation and Chirping Suppressed amplitude Modulation, Journal of Lightwave Technology, vol. LT5, No. 4, Apr. 1987, pp. 516-522.
Giles et al., Simultaneous Wavelength-Stabilization of 980-nm Pump Lasers, IEEE Photonics Technology Letters, vol. 6, No. 8, Aug. 1994, pp. 907-909.
Bennett et al., 980 nm band wavelength tuning of the gain spectrum of EDFAs, Proceedings of Optical Amplifiers and their Applications, Topical Meeting--OSA Trends in Optics and Photonics Series (ISBN 1 55652 505 6), Victoria, BC, Canada, Jul. 21-23, 1997, vol. 16, pp. 152-155.
Yu et al., Gain and Noise Spectrum Properties of Gain-Shaped Erbium Doped Fibre Amplifiers Using Equlalising Filters, Proceedings of the European Conference on Optical Communication (EC Regular Papers, Berlin, Sep. 27-Oct. 1, 1992 Bound as One with vol. 2 & 3, vol. 1, No. CONF. 18, Sep. 27, 1992, pp. 481-484.
Hiromu Toba, A 100-Channel Optical FDM Six-Stage In-Line Amplifier System Employing tunable Gain Equalizers, IEEE Photonics Technology Letters, vol. 5, No. 2, Feb. 1, 1993, pp. 248-251.
Kazunori Suzuki et al., Pumping Wavelength Dependence on Gain Factor of a 0.98 M Pumped ER3+ Fiber Amplifier, Applied Physics Letters, vol. 55, No. 25, Dec. 18, 1989, pp. 2573-2575.
Bennett Kevin W.
Davis Fiona
Habel Richard A.
Jakobson Paul A.
Jolley Nigel E.
Corning Incorporated
Greener William
Hellner Mark
Northern Telecom Limited
Short Svetlana
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