公开(公告)号：JPH10107741A

公开(公告)日：1998-04-24

申请号：JP24705797

申请日：1997-09-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHRAPLYVY ANDREW R ,  ELLSON JOHN C ,  NEWSOME GEORGE W ,  TKACH ROBERT WILLIAM ,  ZYSKIND JOHN LEHRER

IPC: H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/17 ,  H04B10/29 ,  H04J14/02 ,  H04B10/16

Abstract: PROBLEM TO BE SOLVED: To control the power level of a control channel with high reliability regardless of fluctuation in a power level for each wavelength channel and fluctuation in each time slot by providing an optical control channel before a plurality of optical amplifiers in a link. SOLUTION: The link control by this device is realized by a feedback configuration consisting of a power tap 18, a photodetector 20 and a control circuit 22. The feedback configuration responds to the fluctuation in the transmission power level detected by the photodetector 20 by adjusting an output error signal, controlling an output power level of an optical source 24 and providing an output of a control signal for a wavelength λc in a gain band of the optical amplifiers. Thus, the control channel wavelength λc produced in this way is fed back to the link through a wavelength selective coupler 26. The power level of an optical signal fed to the optical amplifiers is maintained by controlling the power level of the control channel.

公开(公告)号：MX9706857A

公开(公告)日：1998-07-31

申请号：MX9706857

申请日：1997-09-09

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 ,  H03F01/00

Abstract: La presente invencion se refiere a un sistema y método para proteger todos los amplificadores en un enlace entre elementos de red de direccionamiento de longitud de onda de una red optica. De acuerdo con la invencion, se agrega un canal de control optico antes de una pluralidad de amplificadores opticos, de preferencia al primer amplificador, en un enlace. Para evitar inadecuada carga de enlaces corriente abajo, el canal de control se desprende o retira en el siguiente elemento de red con direccionamiento de longitud de onda. La potencia del canal de control se ajusta automáticamente utilizando un circuito de realimentacion rápida para mantener constantes substancialmente la potencia total de los canales de señal y el canal de control en la alimentacion del primer amplificador después del bucle de realimentacion. De esta manera, la carga de canal de todos los amplificadores opticos en el enlace se mantiene substancialmente constante y se reduce substancialmente la incidencia de ráfagas de error como de otra forma podría resultar cuando uno o más canales se agregan o retiran debido a una falla o reconfiguracion de red.

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.

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.

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.

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.