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公开(公告)号：JPH11126936A
公开(公告)日：1999-05-11
申请号：JP23933598
申请日：1998-08-26
Applicant: LUCENT TECHNOLOGIES INC , TYCO SUBMARINE SYSTEMS LTD
Inventor： KIDORF HOWARD DAVID , WALKER KENNETH LEE
Abstract: PROBLEM TO BE SOLVED: To reduce multi-optical path interference in an optical fiber communication system. SOLUTION: This optical fiber communication system is equipped with a remote pump type erbium-doped fiber amplifier(EDFA 24). Pump radiation is detuned with respect to wavelength, which is so selected that it is longer than both the optimum wavelength for pumping EDFA and the optimum wavelength for giving Raman gain to a transmission fiber (23). As a result of detuning such as this, multi-optical path interference is reduced, so that the total system performance is improved. For example, the wavelength of the pump radiation is within a range of 1490 to 1510 nm.
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公开(公告)号：JPH1131858A
公开(公告)日：1999-02-02
申请号：JP12047998
申请日：1998-04-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WALKER KENNETH LEE , WILLEMS FREDERICK WILLEM
IPC: G02F1/03 , G02F1/11 , H01S3/06 , H01S3/10 , H01S5/042 , H03F1/32 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04B10/155 , H01S3/096
Abstract: PROBLEM TO BE SOLVED: To provide a high output power and prevent a carrier/noise ratio from being sacrificed, by permitting an optical carrier signal generated by an optical source to hold information by a modulator, and providing a premodulation amplifier that amplifies a carrier signal that is not to be modulated. SOLUTION: A first amplifier 45 inputs a non-modulated carrier signal on a path 41 to a modulator 44 after amplifying it, and a second amplifier 46 amplifies a modulated carrier signal and outputs it to an optical transmission path 49. The modulator 44 modulates the information to write in amplified carrier signal on the path 43 and sends the information to the second amplifier 46 through a path 47. The second amplifier 46 amplifies the carrier signal on the path 47 and sends it to a using device 48 through an optical transmission path 49. An optical transmitter 40 is an analog transmitter that can generate a high power optical output at a relatively high carrier/noise ratio(CNR), and an optical source 42 is a semiconductor laser having a narrow line width for generating a continuous wave carrier signal. The CNR is remarkably improved with a slight gain of the first amplifier 45, high power is outputted and the CNR at the input point of the using device 48 is improved.
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公开(公告)号：JPH10104460A
公开(公告)日：1998-04-24
申请号：JP24845397
申请日：1997-09-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STRASSER THOMAS A , VENGSARKAR ASHISH MADHUKAR , WALKER KENNETH LEE
Abstract: PROBLEM TO BE SOLVED: To obtain a relatively low-cost, reliable, and low-loss waveguide device which has a passive addition/removal multiplexing function, etc., by providing a specific mode discriminating coupler(MDC) and a reflection mode coupling means. SOLUTION: This system has a device group consisting of an MDC 10 and the reflection mode coupling means arranged between a radiation source and a use means. The MDC 10 is a 4-port (14 to 17) coupler having a 1st multi-mode optical waveguide optical waveguide 12 which is coupled with a 2nd multi-mode optical waveguide 12 by evanescent coupling and is different from it. The evanescent field coupling propagates electromagnetic radiation in basic space mode of wavelength λi on the optical waveguides 1 and 12 through the MDC 10 and couples electromagnetic radiation in high-order space mode from one of the optical waveguides 11 and 12 to the other. The reflection mode coupling means consists of a reflection mode coupling grating which has such a blaze refractive index grating that the pitch Λ is less than 1μm and the blaze angle θ larger 3 deg. to the length of the multi-mode optical waveguide.
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公开(公告)号：DE69900958D1
公开(公告)日：2002-04-11
申请号：DE69900958
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GLODIS PAUL FRANCIS , GRIDLEY CHARLES FRANCIS , JABLONOWSKI DONALD PAUL , KALISH DAVID , WALKER KENNETH LEE
IPC: C03C3/04 , C03B37/012 , C03B37/018
Abstract: A large optical preform Ä303Ü is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube Ä33Ü having a hydroxyl ion (OH ) level that is less than 0.5 parts per million (ppm) by weight. The tube is then collapsed inwardly to form a core rod Ä301Ü in which the deposited core material Ä31Ü has a diameter that is greater than about 5 millimeters and the deposited cladding material Ä32Ü has an outside diameter that is less than about 15 millimeters. Optionally a machine-vision system Ä140,150,160Ü monitors and controls the diameter of the glass tube by regulating the pressure within the tube; moreover, the machine-vision system monitors and controls the straightness of the tube by varying its rotational speed according to angular position. After the core rod Ä301Ü is formed, it may be plasma etched to remove contaminants, it is overclad with two glass jackets Ä34,35Ü having a hydroxyl ion (OH ) level that is less than 1.0 ppm by weight thereby creating a large preform Ä303Ü from which about 400 kilometers of singlemode optical fiber can be drawn per meter of length of preform.
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公开(公告)号：DE69731252T2
公开(公告)日：2005-09-08
申请号：DE69731252
申请日：1997-05-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NELSON KATHERINE THERESA , WALKER KENNETH LEE , REED WILLIAM ALFRED , WHITE IAN ARTHUR DUNWOODY
IPC: G02B6/036 , G02B6/00 , G02B6/02 , G02B6/26 , G02B6/293 , G02B6/34 , G02B6/42 , H04B10/00 , H04B10/08 , H04B10/22 , H04B10/24 , H04B10/158 , G02B6/16
Abstract: An optical fiber communication system (40) according to the invention comprises an optical fiber filter that can be manufactured at low cost and that can be conveniently incorporated into the system, substantially like a conventional fiber jumper. The filter comprises a length L of axially uniform optical fiber selected to have substantially no loss (e.g., 1 , and to have relatively high loss (e.g.,> 20dB) at a wavelength λ 2 . The length L will typically be less than 100 m. In one embodiment the optical fiber is a single mode optical fiber at λ 1 (e.g., 1.3µm) that does not have a guided mode at λ 2 (e.g., 1.55µm). In another embodiment the fiber contains a dopant that does substantially not absorb radiation of wavelength λ 1 , but substantially absorbs at λ 2 . In the second embodiment, λ 1 can be greater than λ 2 . Fiber filters according to the invention can be advantageously used in a variety of communication systems, and exemplary systems are disclosed.
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Patent Agency Ranking
公开(公告)号：AT214037T
公开(公告)日：2002-03-15
申请号：AT99305360
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GLODIS PAUL FRANCIS , GRIDLEY CHARLES FRANCIS , JABLONOWSKI DONALD PAUL , KALISH DAVID , WALKER KENNETH LEE
IPC: C03C3/04 , C03B37/012 , C03B37/018
Abstract: A large optical preform Ä303Ü is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube Ä33Ü having a hydroxyl ion (OH ) level that is less than 0.5 parts per million (ppm) by weight. The tube is then collapsed inwardly to form a core rod Ä301Ü in which the deposited core material Ä31Ü has a diameter that is greater than about 5 millimeters and the deposited cladding material Ä32Ü has an outside diameter that is less than about 15 millimeters. Optionally a machine-vision system Ä140,150,160Ü monitors and controls the diameter of the glass tube by regulating the pressure within the tube; moreover, the machine-vision system monitors and controls the straightness of the tube by varying its rotational speed according to angular position. After the core rod Ä301Ü is formed, it may be plasma etched to remove contaminants, it is overclad with two glass jackets Ä34,35Ü having a hydroxyl ion (OH ) level that is less than 1.0 ppm by weight thereby creating a large preform Ä303Ü from which about 400 kilometers of singlemode optical fiber can be drawn per meter of length of preform.
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公开(公告)号：DE69800827T2
公开(公告)日：2001-11-29
申请号：DE69800827
申请日：1998-11-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HEADLEY CLIFFORD , WALKER KENNETH LEE
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公开(公告)号：DE69800548D1
公开(公告)日：2001-04-05
申请号：DE69800548
申请日：1998-08-18
Applicant: LUCENT TECHNOLOGIES INC , TYCO SUBMARINE SYSTEMS LTD
Inventor： KIDORF HOWARD DAVID , WALKER KENNETH LEE
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公开(公告)号：BR9902718A
公开(公告)日：2000-03-21
申请号：BR9902718
申请日：1999-07-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GLODIS PAUL FRANCIS , GRIDLEY CHARLES FRANCIS , JABLONOWSKI DONALD PAUL , KALISH DAVID , WALKER KENNETH LEE
IPC: C03C3/04 , C03B37/012 , C03B37/018
Abstract: A large optical preform Ä303Ü is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube Ä33Ü having a hydroxyl ion (OH ) level that is less than 0.5 parts per million (ppm) by weight. The tube is then collapsed inwardly to form a core rod Ä301Ü in which the deposited core material Ä31Ü has a diameter that is greater than about 5 millimeters and the deposited cladding material Ä32Ü has an outside diameter that is less than about 15 millimeters. Optionally a machine-vision system Ä140,150,160Ü monitors and controls the diameter of the glass tube by regulating the pressure within the tube; moreover, the machine-vision system monitors and controls the straightness of the tube by varying its rotational speed according to angular position. After the core rod Ä301Ü is formed, it may be plasma etched to remove contaminants, it is overclad with two glass jackets Ä34,35Ü having a hydroxyl ion (OH ) level that is less than 1.0 ppm by weight thereby creating a large preform Ä303Ü from which about 400 kilometers of singlemode optical fiber can be drawn per meter of length of preform.
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公开(公告)号：DE69700194D1
公开(公告)日：1999-06-02
申请号：DE69700194
申请日：1997-02-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GRUBB STEPHEN GREGORY , WALKER KENNETH LEE , STENTZ ANDREW JOHN
Abstract: The apparatus includes an optical fibre path of silica-based amplifier fibre that connects an input port and an output port, and a pump radiation input via WDM (13). The pump radiation is introduced at a wavelength lambda p less than a signal wavelength lambda s into the amplifier fibre such that it propagates in the fibre in an upstream direction towards the input port. Provided with the amplifier fibre is at least two lengths of fibre (L1,L2), with the sum of both lengths being at least 200m. An optical isolator is disposed between the two lengths such that passage of radiation of wavelength lambda s from the second to the first length is blocked. The pump path is closed upon itself and includes a portion of the amplifier fibre, the path selected such that the initial pump radiation can circulate in it. A second pump radiation of wavelength lambda p?'lambda p may be introduced into the pump path and a Bragg grating blocks its passage. Selected and placed Bragg gratings provide one or more optical cavities in the fibre ring, such that the input pump radiation is converted to the desired amplifier pump radiation. The wavelength lambda s may be 1310 nm, lambda p 1240 nm, and lambda p?' 1060 nm.
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