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公开(公告)号：CA2227247C
公开(公告)日：2002-05-28
申请号：CA2227247
申请日：1998-01-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ZYSKIND JOHN LEHRER , ZHOU JIANHUI , SUN YAN , SRIVASTAVA ATUL KUMAR , SULHOFF JAMES W
Abstract: An optical amplifier that receives an optical signal at an input of the optical amplifier is arranged so that it amplifies the signal and then adjus ts the level of the amplified input signal to a predetermined level. The optical amplifier, which includes a filter to substantially decrease the wavelength dependence of the optical amplifier, then amplifies the adjusted signal and supplies the resulting signal to an output.
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公开(公告)号：CA2196364C
公开(公告)日：2000-11-21
申请号：CA2196364
申请日：1997-01-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SULHOFF JAMES W , SUN YAN , TKACH ROBERT WILLIAM , ZYSKIND JOHN LEHRER
IPC: H04B10/291 , H04B10/293 , H04B10/294 , H04B10/296 , H04J14/02
Abstract: In a WDM network employing a plurality of optical amplifiers in at least one optical fiber link, a system and method for dynamically controlling gain in accordance with the collective behavior of the amplifier chain. According to the present invention, the required response time of dynamic gain control is selected substantially inversely relative to the number of amplifiers in the communication path. Illustratively, in a large-scale optical network (with signal channel paths traversing say, a hundred optical amplifiers), the response time of gain control in accordance with the present invention may be on the order of 5 .mu.s or even less.
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公开(公告)号：CA2195034A1
公开(公告)日：1997-08-17
申请号：CA2195034
申请日：1997-01-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ZYSKIND JOHN LEHRER
Abstract: In a WDM network employing optical amplifiers, a method of detecting changes in the number of channels present in erbium doped fiber amplifiers (EDFA) that are caused by faults or system reconfigurations. In accordance with the technique of the present invention, the power of one signal channel and the power of the amplified spontaneous emission generated by the local EDFA's are monitored.
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公开(公告)号：DE69732203T2
公开(公告)日：2005-12-29
申请号：DE69732203
申请日：1997-09-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW R , ELLSON JOHN C , NEWSOME GEORGE W , TKACH ROBERT WILLIAM , ZYSKIND JOHN LEHRER
IPC: H04B10/07 , H04B10/29 , H04B10/293 , H04B10/296 , H04B10/564 , H04B10/572 , H04J14/02 , H04B10/17
Abstract: A system and method of protecting all the amplifiers in a link between wavelength routing network elements of an optical network. According to the invention, an optical control channel is added before a plurality of optical amplifier, preferably the first amplifier, in a link. To prevent improper loading of downstream links, the control channel is stripped off at the next wavelength routing network element. The power of the control channel is automatically adjusted using a fast feedback circuit to hold substantially constant the total power of the signal channels and the control channel at the input of the first amplifier following the feedback loop. In this manner, channel loading of all optical amplifiers in the link is maintained substantially constant, and the incidence of error bursts, as might otherwise result when one or more channels are added or dropped due to a network fault or reconfiguration, is substantially reduced.
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Patent Agency Ranking
公开(公告)号：DE69827550T2
公开(公告)日：2005-11-24
申请号：DE69827550
申请日：1998-06-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SUN YAN , SULHOFF JAMES WILLIAM , ZYSKIND JOHN LEHRER
Abstract: A wide band optical amplifier employing a split-band architecture in which an optical signal is split into several independent sub-bands which then pass in parallel through separate branches of the optical amplifier. Each branch may be optimized for the sub-band that traverses it. The independent sub-bands are combined before output, resulting in a broad band, high efficiency amplifier. Alternative, hybrid split-band amplifiers are described. As a result of their desirable characteristics, these wide band optical amplifiers may be used in dense WDM communications systems.
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公开(公告)号：DE69828658D1
公开(公告)日：2005-02-24
申请号：DE69828658
申请日：1998-02-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SULHOFF JAMES W , SUN YAN , ZHOU JIANHUI , ZYSKIND JOHN LEHRER
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公开(公告)号：DE69732203D1
公开(公告)日：2005-02-17
申请号：DE69732203
申请日：1997-09-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW R , ELLSON JOHN C , NEWSOME GEORGE W , TKACH ROBERT WILLIAM , ZYSKIND JOHN LEHRER
IPC: H04B10/07 , H04B10/29 , H04B10/293 , H04B10/296 , H04B10/564 , H04B10/572 , H04J14/02 , H04B10/17
Abstract: A system and method of protecting all the amplifiers in a link between wavelength routing network elements of an optical network. According to the invention, an optical control channel is added before a plurality of optical amplifier, preferably the first amplifier, in a link. To prevent improper loading of downstream links, the control channel is stripped off at the next wavelength routing network element. The power of the control channel is automatically adjusted using a fast feedback circuit to hold substantially constant the total power of the signal channels and the control channel at the input of the first amplifier following the feedback loop. In this manner, channel loading of all optical amplifiers in the link is maintained substantially constant, and the incidence of error bursts, as might otherwise result when one or more channels are added or dropped due to a network fault or reconfiguration, is substantially reduced.
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公开(公告)号：CA2215115C
公开(公告)日：2001-05-29
申请号：CA2215115
申请日：1997-09-11
Applicant: AT & T CORP , LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW R , TKACH ROBERT WILLIAM , NEWSOME GEORGE W , ELLSON JOHN C , ZYSKIND JOHN LEHRER
IPC: H04B10/07 , H04B10/29 , H04B10/293 , H04B10/296 , H04B10/564 , H04B10/572 , H04J14/02 , H04B10/17
Abstract: A system and method of protecting all the amplifiers in a link between wavel ength routing network elements of an optical network. According to the invention, an optical control channel is added before a plurality of optical amplifier, preferably the first amplifier, in a link. To prevent improper loading of downstream links, the c ontrol channel is stripped off at the next wavelength routing network element. The power of the control channel is automatically adjusted using a fast feedback circuit to hold subs tantially constant the total power of the signal channels and the control channel at t he input of the first amplifier following the feedback loop. In this manner, channel loading of all optical amplifiers in the link is maintained substantially constant, and the inciden ce of error bursts, as might otherwise result when one or more channels are added or dropped due to a network fault or reconfiguration, is substantially reduced.
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公开(公告)号：CA2215115A1
公开(公告)日：1998-03-13
申请号：CA2215115
申请日：1997-09-11
Applicant: AT & T CORP , LUCENT TECHNOLOGIES INC
Inventor： NEWSOME GEORGE W , ZYSKIND JOHN LEHRER , ELLSON JOHN C , CHRAPLYVY ANDREW R , TKACH ROBERT WILLIAM
IPC: H04B10/07 , H04B10/29 , H04B10/293 , H04B10/296 , H04B10/564 , H04B10/572 , H04J14/02 , H04B10/17
Abstract: A system and method of protecting all the amplifiers in a link between wavel ength routing network elements of an optical network. According to the invention, an optical control channel is added before a plurality of optical amplifier, preferably the first amplifier, in a link. To prevent improper loading of downstream links, the c ontrol channel is stripped off at the next wavelength routing network element. The power of the control channel is automatically adjusted using a fast feedback circuit to hold subs tantially constant the total power of the signal channels and the control channel at t he input of the first amplifier following the feedback loop. In this manner, channel loading of all optical amplifiers in the link is maintained substantially constant, and the inciden ce of error bursts, as might otherwise result when one or more channels are added or dropped due to a network fault or reconfiguration, is substantially reduced.
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