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公开(公告)号：JP2000106682A
公开(公告)日：2000-04-11
申请号：JP21171199
申请日：1999-07-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , KNOX WAYNE HARVEY
Abstract: PROBLEM TO BE SOLVED: To easily switch respective channels of multiple wavelength light signals for each wavelength by respectively relating input and output photocouplers to the correspondent input and output photocouplers of an optical switch and controlling the transmitting operation mode and reflecting operation mode of fiber grids. SOLUTION: An optical cross connector 300 receives K pieces of multi- wavelength light signals respectively having the channels of different wavelengths, routes the respective channels of multiple wavelength light signals between K pieces of cross connect inputs and M pieces of cross connect outputs and outputs M pieces of multiple wavelength light signals. As a K×1 star coupler, having K pieces of input ports and a single output port, an output photocoupler 320 is related to respective cross connect output ports 315. An input photocoupler 310 and an output photocoupler 320 are mutually bonded through a mutual connection wavelength selective optical fiber 325, and the wavelength selective optical fiber 325 transmits or reflects one of respective wavelength channels of multiple wavelength light signals.
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公开(公告)号：CA2220267A1
公开(公告)日：1998-06-30
申请号：CA2220267
申请日：1997-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , KNOX WAYNE HARVEY
Abstract: A gain-switched optical selector is realized by employing an optical rare earth-doped fiber optical amplifier as the switching element per se. Each of the optical rare earth-doped optical amplifiers acts as an ON/OFF switch. Also, the gain-switched optical selector of this invention is a natural fit into today's optically amplified opt ical communication systems. In one embodiment, this is realized by employing a pump s elect circuit in conjunction with a plurality of pumps and a plurality of correspondin g rare earth-doped fiber optical amplifiers. The particular pump and corresponding opti cal amplifier are selected by use of a monitor arrangement to determine which signal is to be selected and routed to an output. In another embodiment, a so-called tuned pump arrangeme nt is employed in conjunction with a plurality of filters and a corresponding pluralit y of rare earth-doped fiber optical amplifiers. A pump tuning arrangement is employed to c ontrol the tunable pump in order to select the appropriate one of a plurality of optica l input signals at any of a plurality of given wavelengths.
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公开(公告)号：CA2273410A1
公开(公告)日：2000-01-27
申请号：CA2273410
申请日：1999-05-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , KNOX WAYNE HARVEY
Abstract: An optical switch includes an optical router portion for distributing multi-wavelength optical signals received at input ports of the switch, an optical combiner portion for supplying multi-wavelength signals at the output ports of the switch, and optical fibers for interconnecting the optical router portion and optical combiner portion. Selected ones of the interconnecting optical fibers include wavelength-selective elements, such as fiber gratings, which are capable of transmitting or reflecting individual channels within the multi-wavelength optical signal so that a selected channel of a particular wavelength can be routed from any of the input ports to any of the output ports of the switch. In one exemplary embodiment, the optical router portion includes a plurality of input optical couplers, wherein each input optical coupler is associated with a corresponding input port of the optical switch. Similarly, the optical combiner portion includes a plurality of output optical couplers, wherein each output optical coupler is associated with a corresponding output port of the optical switch. Each input optical coupler together with its associated fiber gratings on the interconnecting optical fibers is used for distributing the signals received via the input ports while each output optical coupler together with its associated fiber gratings is used for combining the signals to be supplied at the output ports of the switch. By controlling the transmissive and reflective operating modes of the fiber gratings, the fiber gratings can facilitate the switching of individual channels of the multi-wavelength optical signals on a wavelength by wavelength basis.
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公开(公告)号：CA2253752C
公开(公告)日：2002-10-08
申请号：CA2253752
申请日：1998-11-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , FORD JOSEPH EARL
Abstract: A free-space N by M where N and M > 1 optical signal switch (OXC) requires only transmitter beam steering for controlling to which receiver an optical signal from a transmitter is directed. In a preferred embodiment the transmi tters handle single mode optical signals and the receivers handle multimode optica l signals. The OXC may optionally include a fixed optical unit implemented usi ng either a single fixed shared lens or a plurality of M optical elements for further directing each of the M optical signals to their respective receivers.
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公开(公告)号：CA2244475A1
公开(公告)日：1999-02-28
申请号：CA2244475
申请日：1998-08-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI
IPC: G02F1/31 , G02B6/34 , H04B10/27 , H04B10/275 , H04B10/29 , H04B10/296 , H04J14/02
Abstract: An expandable optical add/drop system according to the present invention includes an optical add/drop multiplexer with an integrated amplification and wavelength-selective fiber path and passive optical couplers for selectively adding and dropping wavelengths from a multi-wavelength signal, such as a wavelength division multiplexed optical signal. One or more fiber gratings are disposed along the length of a rare earth-doped optical fiber or between segments of the rare earth-doped optical fiber so that at least one grating is used for reflecting each optical signal that is to be added to or dropped from the multi-wavelength optical signal. By using this configuration, appropriate amplification is provided to compensate for specific losses in the add, drop, and through paths for existing and future add/drop service.
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Patent Agency Ranking
公开(公告)号：CA2220234A1
公开(公告)日：1998-06-30
申请号：CA2220234
申请日：1997-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KNOX WAYNE HARVEY , FATEHI MOHAMMAD TAGHI
Abstract: A loss-less optical cross-connect advantageously employs a plurality of optical rare earth-doped fiber optical amplifiers as gain-switched optical connections, for e xample, gain-switched optical distributors and gain-switched optical selectors. Each of the optical rare earth-doped fiber optical amplifiers acts as an ON/OFF switch. Also, both the gain-switched optical distributors and selectors employed in the optical cross-c onnect arrangement of this invention are a natural fit into today's optically amplified optical communication systems. In one embodiment, this is realized by employing a pump s elect circuit in conjunction with a plurality of pumps and the plurality of correspond ing rare earth-doped fiber optical amplifiers. The particular pump and corresponding opti cal amplifier are selected by use of a control circuit arrangement to determine whic h output port or ports is (are) connected to the input port. The rare earth-doped fiber o ptical amplifiers and the corresponding pumps are employed advantageously for both the gain-switched optical distributors and the gain-switched optical selectors. In a nother embodiment, a so-called tuned pump arrangement is employed in conjunction with a plurality of filters and a corresponding plurality of rare earth-doped fiber opt ical amplifiers. A pump tuning arrangement is employed to control the tunable pump in order to select the appropriate one of a plurality of optical amplifiers to be activat ed, thus routing the input signals at any of a plurality of given wavelengths to the corr esponding output line (or lines if broadcasting capability is employed). Again, the rare e arth-doped fiber optical amplifiers and the corresponding pumps are employed advantageously for both the gain-switched optical distributors and the gain-switched optical select ors.
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公开(公告)号：CA2266289A1
公开(公告)日：1999-10-28
申请号：CA2266289
申请日：1999-03-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RAYCHAUDHURI KAMAL KUMAR , FATEHI MOHAMMAD TAGHI , NELSON BRUCE LEE
Abstract: Automatic reduction of optical signal power supplied by an upstream network element by a prescribed amount is achieved by capturing and processing reflected optical energy that is generated within the optical fiber path as a result of a downstream fiber cut, open connector, or other potentially hazardous discontinuity. Generally, the power level of the reflected optical signal is detected and measured in the optical fiber path and the optical signal power supplied by the upstream network element is automatically reduced. The optical signal power may either be reduced by an amount corresponding to the measured reflected optical signal power or may be completely shut off until the faulty condition is resolved. In one illustrative embodiment, an apparatus for automatically reducing or shutting off the optical signal power supplied by an upstream network element includes a directional optical transfer device disposed along the optical fiber path and coupled to the output of a network element, an optical power monitor for measuring the reflected optical energy received via the directional optical coupler as a result of a downstream fiber discontinuity, and control circuitry coupled between the power monitor and the network element to control the optical signal power being supplied by the network element based on the monitored power level of the reflected optical signal. The control circuitry may be analog, digital, or may be implemented using a microprocessor operating under software or firmware program control.
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公开(公告)号：MX9710244A
公开(公告)日：1998-10-31
申请号：MX9710244
申请日：1997-12-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , KNOX WAYNE HARVEY
Abstract: La presente invencion se refiere a un selector optico conmutado por ganancia, que se logra al emplear un amplificador optico de fibra adulterada con tierra rara optica como el elemento de conmutacion per se. Cada uno de los amplificadoresopticos de fibras adulteradas con tierras raras opticas, actua como un conmutador de ENCENDIDO/APAGADO. También, el selector optico conmutado de ganancia de esta invencion es un complemento natural en los sistemas de comunicaciones opticos amplificados opticamente en la actualidad. En una modalidad, esto se logra al emplear un circuito selector de bomba, en conjunto con una pluralidad de bombas y una pluralidad de amplificadores opticos de fibras adulteradas con tierras raras. La bomba particular y el amplificador optico correspondiente se elige por uso de una estructura de verificacion, para determinar que señal se va a seleccionar y dirigir a una salida. En otra modalidad, una estructura de bomba así denominada sintonizada se emplea en conjunto con una pluralidad de filtros y una pluralidad correspondientes de amplificadores opticos de fibras adulteradas con tierras raras. Una estructura de sintonizacion de bomba se emplea para controlar la bomba sintonizable a fin de seleccionar la apropiada de las señales de alimentacionopticas a cualquiera de una pluralidad de longitudes de onda determinadas.
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公开(公告)号：CA2220266A1
公开(公告)日：1998-06-30
申请号：CA2220266
申请日：1997-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KNOX WAYNE HARVEY , FATEHI MOHAMMAD TAGHI
Abstract: An optical line protection switching system is realized by employing a plurality of rare earth-doped fiber optical amplifiers as gain-switched optical connections, for example gain-switched optical distributors, i.e., commutators, and/or gain-s witched optical selectors in a gain switched optical line protection switching system. I n one embodiment, at least one or more gain switched optical distributors are employed to realize so-called head-end switching of an incoming optical signal and one or mo re gain switched optical selectors are employed to realize so-called tail-end switching of the optical signal to form a 1x1 (1xN) optical line protection switching system. In another embodiment, an incoming optical signal is bridged to one or more optical paths, while the tail-end switching is realized by employing one or more gain-switched optical se lectors to form a 1+1 (1+N) optical line protection switching system.
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公开(公告)号：DE60044413D1
公开(公告)日：2010-07-01
申请号：DE60044413
申请日：2000-07-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FATEHI MOHAMMAD TAGHI , KNOX WAYNE HARVEY
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