Optical: systems and elements – Optical amplifier – Beam combination or separation
Reexamination Certificate
2007-01-23
2007-01-23
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Beam combination or separation
C359S341320
Reexamination Certificate
active
10674102
ABSTRACT:
A wideband erbium-doped optical fiber amplifier is disposed among an optical fiber through which a first and second band-band optical signals (for example, the C-band and L-band) are transmitted and forms a first optical path and a second optical path parallel to each other. The wideband erbium-doped optical fiber amplifier comprising a first amplifying section disposed on the first optical path, including a first erbium-doped optical fiber to amplify the first-band optical signals, a filter to gain-flatten the amplified first-band optical signals, wherein a reflected portion of the first band optical signal by the filter is directed to the second optical path; and a second amplifying section disposed on the second optical path, having a second erbium-doped optical fiber to amplify received second-band optical signals, wherein the reflected first-band optical signal is used to pump the second erbium-doped optical fiber.
REFERENCES:
patent: 6049417 (2000-04-01), Srivastava et al.
patent: 6049418 (2000-04-01), Srivastava et al.
patent: 2001-057454 (2001-02-01), None
patent: 2001-203415 (2001-07-01), None
Doh Sang-Hyun
Kim Jong-Kwon
Lee Hak-Phil
Lee Jong-Hun
Lee Ki-Cheol
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