Method of upgrading transmission capacity by Raman amplification

Patent 5959750 Issued on September 28, 1999. Estimated Expiration Date:

June 6, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Optical communication systems using raman repeaters and components therefor
Patent #: 4616898
Issued on: 10/14/1986
Inventor: Hicks, Jr.

Optical communication apparatus Patent #: 5675428
Issued on: 10/07/1997
Inventor: Henmi

Inventors

Application

No. 659607 filed on 06/06/1996

US Classes:

398/92, Including pumping359/334, Raman or Brillouin process398/91, Different sources398/157Including pumping

Examiners

Primary: Negash, Kinfe-Michael

Attorney, Agent or Firm

Brosemer; Jeffery J.

International Class

H04J 014/02

Abstract

An upgrade method in which Raman amplification is added to an existing transmission system to provide an increase in power budget and permit a substantial increase in transmission capacity either by time division multiplexing (TDM), wavelength division multiplexing (WDM), or a combination thereof. The power budget improvement permits higher transmission capacity by increasing either a single channel data rate and/or the number of wavelength division multiplexed data channels that can be accommodated by existing fiber links.

Other References

"Experimental demonstration of soliton propagation in long fibers: loss compensated by Raman gain," L. F. Mollenauer et al, Optical Letter, vol. 10, No. 5, pp. 229-231, 1985
"2.488-Gb/s Unrepeatered transmission over 529 km using remotely pumped post-and pre-amplifiers, forward error correction, and dispersion compensation", P. B. Hansen et al., Proc. OFC '95, Paper PD-25, San Diego, CA, Feb. 1995
"511km at 2.5Gbit/s and 531km at 622 Mbit/s--Unrepeatered Transmission with Remote pumped amplifiers, Forward error Correction and Dispersion Compensation," S. S. Sian et al., Proc. OFC '95, Paper PD-26, San Diego, CA., Feb. 1995
"Fundamental-mode dispersion-compensating fibers: design considerations and experiments," A. M. Vengsarkar et al., Proc. OFC '94, Paper ThK2, San Jose, CA, Feb. 1994
"Comparison of Raman efficiencies in optical fibers,"V. L. daSilva et al., Proc. OFC '94, Paper WK13, San Jose, CA, Feb. 1994
G. P. Agrawal, Nonlinear Fiber Optics (Academic Press, New York), 1989, Chap.