Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2007-10-09
2007-10-09
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
Reexamination Certificate
active
11424309
ABSTRACT:
The present invention provides methods and apparatuses for controlling a gain of a bidirectionally-pumped Raman fiber amplifier having both forward optical pumps and backward optical pumps. The overall gain is controlled by adjusting the forward optical pumps, while the power levels of the backward optical pumps are essentially fixed. Gain circuitry operates in an opened loop configuration and uses a predetermined function relating a power variation of at least one wavelength region with a pump power adjustment for at least one forward optical pump. Two approximate linear relationships between the input signal power variations and the required pump power adjustments are utilized in controlling the Raman fiber amplifier. Each approximate linear relationship includes at least one linear coefficient that relates a power variation for a specific wavelength region and a power adjustment of a specific Raman pump.
REFERENCES:
patent: 6236500 (2001-05-01), Suzuki et al.
patent: 6417965 (2002-07-01), Ye et al.
patent: 6441950 (2002-08-01), Chen et al.
patent: 6498677 (2002-12-01), Sun et al.
patent: 6510000 (2003-01-01), Onaka et al.
patent: 6574037 (2003-06-01), Islam et al.
patent: 6624926 (2003-09-01), Hayashi et al.
patent: 6690504 (2004-02-01), Nagel et al.
patent: 6690506 (2004-02-01), Zahnley et al.
patent: 6958856 (2005-10-01), Inoue et al.
patent: 6987608 (2006-01-01), Nakaji
patent: 7038843 (2006-05-01), Denkin et al.
patent: 2002/0041431 (2002-04-01), Ohshima et al.
patent: 2002/0044343 (2002-04-01), Manzur
patent: 2002/0054733 (2002-05-01), Kagi
patent: 2002/0186456 (2002-12-01), Inoue et al.
patent: 2003/0147124 (2003-08-01), Inoue
patent: 2003/0210457 (2003-11-01), Emori et al.
patent: 2004/0052453 (2004-03-01), Mao et al.
patent: 2004/0091206 (2004-05-01), Denkin et al.
patent: 1248 334 (2002-10-01), None
patent: 2004032383 (2004-04-01), None
Yihong, Chen et al., “Bi-directionally pumped broadband Raman amplifier,” ECOC, Sep. 2001, pp. 230-231, Freehold, NJ.
Kado, Soko et al., “Broadband flat-noise Raman amplifier using low-noise bi-directionally pumping sources,” ECOC, 2001, pp. 1-2, Kanagawa, Japan.
Essiambre, Rene-Jean et al. “Design of Bidirectionally Pumped Fiber Amplifiers Generating Double Rayleigh Backscattering,” IEEE Photonics Technology Letters, Jul. 2002, pp. 914-916, vol. 14, No. 7, USA.
Bromage, J. et al., “High co-directional Raman gain for 200-km spans, enabling 40×10.66 Gb/s transmission over 2400 km,” OFC, 2003, pp. PD24-1 to PD24-3, Holmdel, NJ.
Chen, C.J. et al., “Control of transient effects in distributed and lumped Raman amplifier,” Electronic Letters, Oct. 2001, pp. 1304-1305, vol. 37, No. 21, USA.
Wang, L.L., et al., “Gain transients in co-pumped and counter-pumped Raman amplifiers,” IEEE Photonics Technology Letters, May 2003, pp. 664-666, vol. 15, No. 5, USA.
Zhou, Xiang et al., “Theoretical investigation of fiber Raman amplifier with dynamic gain control”, OFC, 2001, pp. WDD17-1-WDD17-3, Singapore.
Bolognini, G. et al., “Transient effects in gain-clamped discrete Raman amplifier cascades”, IEEE Photonics Technology Letters, Jan. 2004, pp. 66-68, vol. 16, No. 1, USA.
Zhou, Xiang et al., “Submicrosecond Transient Control for a Forward-Pumped Raman Fiber Amplifier”, IEEE Photonics Technology Letters, 2005, pp. 2059-2061, vol. 17, No. 10, USA.
Zhou, Xiang et al., “A new technique for dynamic gain profile control in a multi-wavelength backward-pumped discrete Raman amplifier”, 2001, pp. 1-3, USA.
Kim, Pilhan et al. “Semianalytic Dynamic Gain-Clamping Method for the Fiber Raman Amplifier”, IEEE Photonics Technology Letters, Apr. 2005, pp. 768-770, vol. 17, No. 4, USA.
Birk Martin
Zhou Xiang
AT&T Corporation
Banner & Witcoff , Ltd.
Bolda Eric
Keith Jack
LandOfFree
Fast dynamic gain control in cascaded Raman fiber amplifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fast dynamic gain control in cascaded Raman fiber amplifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast dynamic gain control in cascaded Raman fiber amplifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3900629