Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2006-06-13
2006-06-13
Hughes, Deandra (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S341400
Reexamination Certificate
active
07061668
ABSTRACT:
A gain control circuit for an optical amplifier includes a feed-forward path which enables the pump power of an excitation laser to be controlled based on input power of the amplifier. The feed-forward path is complemented by a feed-back loop which includes: a subtractor that outputs an error signal based on a difference between scaled input power and output power of the optical amplifier; a regulator which generates a bias and correction signal that reduces the error signal to zero; and an adder which adds the bias and correction signal to the input power signal of the feed-forward path. The output of the adder forms a pump control signal which maintains a desired gain of the amplifier irrespective of fluctuations in input power and channel load changes, as well as other influences. Through the use of purely electronic control, the control circuit controls the gain of the amplifier with substantially less pump power than conventional circuits utilizing other known methods. Further, the feed-forward path eliminates gain sag which degrades the performance of many conventional amplifier circuits. Preferably, the control circuit is dynamically adapted to the non-linear dynamic behavior of the optical amplifier. This will advantageously result in a substantial improvement in speed of the amplifier control.
REFERENCES:
patent: 5446812 (1995-08-01), Hirst
patent: 5923462 (1999-07-01), van der Plaats
patent: 6366395 (2002-04-01), Drake et al.
patent: 6377394 (2002-04-01), Drake et al.
patent: 6452722 (2002-09-01), Krummrich et al.
patent: 6522460 (2003-02-01), Bonnedal et al.
patent: 6631027 (2003-10-01), Gerrish et al.
patent: 6690505 (2004-02-01), Ye
patent: 2003/0030894 (2003-02-01), Stentz
patent: 2004/0240044 (2004-12-01), Park et al.
patent: 2301945 (1982-04-01), None
patent: 2 759 831 (1998-08-01), None
patent: PCT/DE99/00963 (1999-03-01), None
Patent Abstract of Japan, Publication No. 05063643, dated Mar. 12, 1993.
Patent Abstract of Japan, Publication No. 10190107, dated Jul. 21, 1998.
Patent Abstract of Japan, Publication No. 04293025, dated Oct. 16, 1992.
Article by A.K. Sristava et al. Entitled “Fast Gain Control in an Erbium-Doped Fiber Amplifier”, Proceedings Optical Amplifiers and Their Application 1996, Monterrey, CA paper date PDP4 (1996) pp. PDP 4-2-5.
Article by M. Zirngibl entitled “Gain Control in Erbium-doped Fibre Amplifiers By An All-optical Feedback Loop”, Electronics Letters, vol. 27, No. 7 (1991), pp. 560-1.
Article by J.F. Massicott et al. Entitled “1480nm Pumped Erbium Doped Fibre Amplifier With All Optical Automatic Gain Control”, Electronics Letters vol. 30, No. 12 (1994) pp. 96-4.
Article by J. Chung and S.Y. Kim entitled “Dynamic Performance of the All-Optical Gain-Controlled EDFA Cascade in Multi-Wavelength Add/Drop Networks”, 23rdEuropean Conference on Optical Communications ECOC 97 IEE Conference Publication No. 448 (1997) pp. 139-142.
Article by J.L. Zyskind et al. Entitled “Fast Link Control Protection For Surviving Channels In Multiwavelength Optical Networks” 22ndEuropean Conference on Optical Communications ECOC '96, Oslo, paper THC3.6 (1996) pp. 5.49-5.52.
Article by M. Karasek and F.W. Williams Entitled “Suppression of Dynamic Cross Saturation in Cascades of Overpumped Erbium-Doped Fibre Amplifiers” IEEE Photonics Technology Letters vol. 10, No. 7 (1998) pp. 1036-1038.
Maurer Erich K.
Zhuber-Okrog Kuno
Bolda Eric
Hughes Deandra
Siemens Communications Inc.
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