Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2005-06-21
2005-06-21
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S341300
Reexamination Certificate
active
06909535
ABSTRACT:
An optical communication system employing Raman amplification includes a plurality of first optical fibers each having a first nonlinear effective cross sectional area and each coupled to a terminal station or a repeater in a transmission line between the terminal station and the repeater or between two repeaters, a second optical fiber having a second nonlinear effective cross sectional area larger than the first nonlinear effective cross sectional area and coupled between two first optical fibers. The Raman amplification is made in the transmission line by pumping in two directions from the two repeaters coupled to both ends of the transmission line or from the terminal station and the repeater.
REFERENCES:
patent: 6404964 (2002-06-01), Bhagavatula et al.
patent: 6795235 (2004-09-01), Okuno et al.
patent: 2001-237777 (2001-08-01), None
Hainberger et al., “Optimum span configuration of Raman-amplified dispersion-managed fibers”, OFC, Mar. 19, 2001, MI5-1 to MI5-3.
Okuno et al., “Novel Lossless Optical Transmission Line with Distributed Raman Amlification”, ECOC, 2000, vol. 2.
Bolda Eric
Tarcza Thomas H.
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