Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2006-12-19
2006-12-19
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S337000, C398S181000
Reexamination Certificate
active
07151630
ABSTRACT:
A repeater according to the present invention includes a plurality of excitation light sources with varying center wavelengths for use as an excitation light source to achieve Raman amplification; and comprises a flatness monitoring circuit which monitors the flatness of signal light on a transmission line; a monitor control circuit which controls externally said excitation light sources based on a remote supervisory control signal and which determines which of said excitation light sources to control as appropriate according to the flatness of signal light identified by said flatness monitoring circuit; and a bandwidth selective reflector or LD modules which, under the control of said monitor control circuit, outputs said flatness information to another repeater as a remote supervisory control signal with a specific wavelength, via said transmission line.
REFERENCES:
patent: 6377396 (2002-04-01), Sun et al.
patent: 6510000 (2003-01-01), Onaka et al.
patent: 2001/0019448 (2001-09-01), Yokoyama
patent: 2003/0011874 (2003-01-01), Nakamoto et al.
patent: 2003/0072064 (2003-04-01), Ohta
patent: 1 265 381 (2002-12-01), None
patent: 2001-15845 (2001-01-01), None
patent: 2001-235772 (2001-08-01), None
patent: WO 03/069811 (2003-08-01), None
Hellner Mark
NEC Corporation
Young & Thompson
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