Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2005-09-13
2005-09-13
Sedighian, M. R. (Department: 2633)
Optical communications
Fault recovery
Bypass inoperative element
C398S017000, C398S094000, C398S095000
Reexamination Certificate
active
06944399
ABSTRACT:
A method for maintaining amplifier saturation in a wavelength division multiplexed (WDM) optical network having a plurality of sub-bands, each sub-band including at least two signal channels which carry respective data signals, and a plurality of substitute signal transmitters, each substitute signal transmitter generating a substitute signal and corresponding to a respective one of the plurality of sub-bands, includes identifying signal channels having a predetermined characteristic within each of the plurality of sub-bands. A substitute signal transmitter is turned on if the sub-band corresponding to the substitute signal transmitter includes a predetermined number of signal channels having said predetermined characteristic. The data signals and the substitute signals are combined into a WDM signal, and the WDM signal is transmitted over an optical transmission fiber.
REFERENCES:
patent: 4963832 (1990-10-01), Desurvire et al.
patent: 4971417 (1990-11-01), Krinsky et al.
patent: 5088095 (1992-02-01), Zirngibl
patent: 5117196 (1992-05-01), Epworth et al.
patent: 5223705 (1993-06-01), Aspell et al.
patent: 5239607 (1993-08-01), da Silva et al.
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5299055 (1994-03-01), Yoneyama
patent: 5455704 (1995-10-01), Mizuochi et al.
patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5563731 (1996-10-01), Asahi
patent: 5570227 (1996-10-01), Nabeyama et al.
patent: 5677781 (1997-10-01), Mori et al.
patent: 5764404 (1998-06-01), Yamane et al.
patent: 5857043 (1999-01-01), Cook et al.
patent: 5861981 (1999-01-01), Jabr
patent: 5864414 (1999-01-01), Barnsley et al.
patent: 5870217 (1999-02-01), Itou et al.
patent: 5872649 (1999-02-01), Bryon et al.
patent: 5900968 (1999-05-01), Srivastava et al.
patent: 5900969 (1999-05-01), Srivastava et al.
patent: 5907420 (1999-05-01), Chraplyvy et al.
patent: 5907429 (1999-05-01), Akihiko et al.
patent: 5914794 (1999-06-01), Fee et al.
patent: 5923453 (1999-07-01), Yoneyama
patent: 5926304 (1999-07-01), Tajima
patent: 5940209 (1999-08-01), Nguyen
patent: 5986800 (1999-11-01), Kosaka
patent: 6038062 (2000-03-01), Kosaka
patent: 6172782 (2001-01-01), Kobayashi
patent: 6252699 (2001-06-01), Kohn
patent: 6317255 (2001-11-01), Fatehi et al.
patent: 6563614 (2003-05-01), Stephens et al.
patent: 6602002 (2003-08-01), Srivastava et al.
patent: 6714740 (2004-03-01), Tajima
patent: 6731877 (2004-05-01), Cao
patent: 0651476 (1994-10-01), None
patent: 0792035 (1997-02-01), None
patent: 0829981 (1997-09-01), None
patent: 0838913 (1998-04-01), None
patent: 0881790 (1998-05-01), None
patent: 0887953 (1998-06-01), None
patent: 0910182 (1999-04-01), None
patent: 10-242943 (1997-03-01), None
patent: 10-256633 (1997-03-01), None
patent: 10-247896 (1998-03-01), None
patent: 10-262032 (1998-12-01), None
patent: WO 00/72479 (2000-11-01), None
Na, K.W., et al., Rate equation model for gain-clamped erbium-doped fibre amplifiers, Apr. 15, 1999, vol. 35, No. 8, p. 663, Electronics Letters.
Kishi, Naoto and Yazaki, Tomonori; Frequency Control of a Single-Frequency Fiber Laser by Cooperatively Induced Spatial-Hole Burning, Feb. 1999, vol. 11, No. 2, p. 182, IEEE Photonics Technology Letters.
Desurvire, E., et al., Dynamic Gain Compensation in Saturated Erbium-Doped Fiber Amplifiers, May 1991, vol. 3, No. 5, pps. 453-455, IEEE Photonics Technology Letters.
Ellis, A.D., et al., Automatic Gain Control in Cascaded Erbium Doped Fibre Amplifier Systems, Jan. 31, 1991, vol. 27, No. 3, pps. 193-195, Electronics Letters.
Zirngibl, M., Gain Control in Erbium-Doped Fibre Amplifiers by an All-Optical Feedback Loop, Mar. 28, 1991, vol. 27, No. 7, pps. 560-561, Electronics Letters.
Luo, G., et al., Relaxation Oscillations and Spectral Hole Burning in Laser Automatic Gain Control of EDFAs, 1997, p. 130, OFC '97 Technical Digest.
Zyskind, J.L., et al., Fast Power Transients in Optically Amplified Multi-wavelength Optical Networks, Feb. 29, 1996, Optical Fiber Communication Post-Deadline Paper 1996, p. PD31.
Takushima, Yuichi, et al., Gain Spectrum Equalization of All-Optical Gain-Clamped Erbium-Doped Fiber Amplifier, Feb. 1999, vol. 11, No. 2, pps. 176-178, IEEE Photonics Technology Letters.
Srivastava, A.K., et al., Fast-Link Control Protection of Surviving Channels in Multiwavelength Optical Networks, Dec. 1997, vol. 9, No. 12, pp. 1667-1669, IEEE Photonics Technology Letters.
Zyskind, J.L., et al., Fast Link Control Protection for Surviving Channels in Multiwavelength Optical Networks, 1996, pps. 5.49-5.52, 22ndEuropean Conference on Optical Communications, ECOC '96 Oslo.
Jackel, Janet Lehr, et al., All-Optical Stabilization of Cascaded Multichannel Erbium-Doped Fiber Amplifiers with Changing Numbers of Channels, 1997, pps. 84-85, OFC '97 Technical Digest.
Kashyap, R., et al., Wavelength Flattened Saturated Erbium Amplifier Using Multiple Side Tap Bragg Gratings, May 27, 1993, vol. 29, No. 11, pps. 1025-1026, Electronics Letters.
Massicott, J.F., et al., 1480nm Pumped Erbium Doped Fibre Amplifier with All Optical Automatic Gain Control, Jun. 9, 1994, vol. 30, No. 12, pps. 962-964, Electronics Letter.
Delevaque, E., et al., Gain Control in Erbium-doped fibre amplifiers by lasing at 1480nm with photoinduced Bragg Gratings written on Fibre Ends, Jun. 10, 1993, vol. 29, No. 12, pps. 1112-1114, Electronic Letters.
Morten Ibsen et al.,8- and 16-Channel All-Fiber DFB Laser WDM Transmitters with Integrated Pump Redundancy, IEEE Photonics Technology Letters, pp. 1114-1116, vol. II, No. 9, Sep. 1999.
Daniel T. Van Atta et al., AT&T Technical Journal, Jan./Feb. 1995, vol. 74, No. 1.
Clark, Jr. Thomas R.
Petricevic Vladimir
Shieh William
Yu Zhengchen
Dorsal Networks Inc.
Sedighian M. R.
Tran Dzung
LandOfFree
Methods of signal substitution for maintenance of amplifier... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods of signal substitution for maintenance of amplifier..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of signal substitution for maintenance of amplifier... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3430002