Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2008-04-15
2008-04-15
Hughes, Deandra M (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S337120
Reexamination Certificate
active
07359112
ABSTRACT:
A control apparatus comprises a light monitoring unit for dividing a signal wavelength band into at least a band in which output light power of an optical amplifier tends to decrease at an decrease in the number of signal wavelengths and a band including a gain deviation band, and for monitoring inputted light power for the individual divided bands, a calculation unit for obtaining the number of signal wavelengths in the individual divided bands based on a monitor result, and a target gain correction unit for correcting a target gain based on a result of the calculation. This suppresses a transient variation of signal light level due to SHB or SRS at a high speed with a simple configuration without deteriorating noise characteristic, thus enabling optical amplifiers to be further disposed in a multi-stage fashion, which can lengthen the transmission distance of a transmission system including an optical add/drop unit.
REFERENCES:
patent: 5680247 (1997-10-01), Okuno
patent: 5933270 (1999-08-01), Toyohara
patent: 6008935 (1999-12-01), Fujita et al.
patent: 6256140 (2001-07-01), Kobayashi
patent: 6760150 (2004-07-01), Goto et al.
patent: 7006282 (2006-02-01), Tian et al.
patent: 2003/0174390 (2003-09-01), Kakui
patent: 2003/0185563 (2003-10-01), Stephens et al.
patent: 2005/0146782 (2005-07-01), Takeyama et al.
patent: 10-173597 (1998-06-01), None
patent: 11-337750 (1999-12-01), None
patent: 2001-168841 (2001-06-01), None
patent: 2003-258348 (2003-09-01), None
Nishihara, et al., “Characterization and New Numerical Model of Spectral Hole Burning in Broadband Erbium-Doped Fiber Amplifier”, 2003 Optical Society of America, Jul. 6, 2003.
Nishihara, et al, “Impact of Spectral Hole Burning in Multi-Channel Amplification of EDFA”, 2004 Optical Society of America, Feb. 22, 2004.
M. Bolshtyansky, “Spectral Hole Burning in Erbium-Doped Fiber Amplifiers”, Journal of Lightwave Technology, vol. 21, No. 4, Apr. 2003.
Hayashi Etsuko
Muro Shinichirou
Nishihara Masato
Onaka Miki
Fujitsu Limited
Hughes Deandra M
Staas & Halsey , LLP
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