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公开(公告)号：JPH11132772A
公开(公告)日：1999-05-21
申请号：JP23789798
申请日：1998-07-22
Applicant: LITTON SYSTEMS INC
Inventor： RAHN JOHN P
Abstract: PROBLEM TO BE SOLVED: To increase the quenching ratio of a multi-function integrated optical chip (MIOC) and to improve the operation efficiency an absorbing cover body by laminating a layer having a selected high refraction factor and a low refraction factor. SOLUTION: An absorbing layer 26 is formed by deposition on a MIOC, and a mount 28 is provided on the absorbing layer 26 to form this light absorbing device 25 for preventing reflection. The mount 28 is made of SiO2 , and the absorbing layer 26 is preferably made of SnTe. The absorbing layer 26 is similar to a 1/4-wavelength reflection preventing cover body as a single layer, and the refraction factor of the mount 28 is selected to generate interface internal total reflection between the absorbing layer 26 and the mount 28. The thickness of the 1/4-wavelength layer has the reciprocation length of the 1/2-wavelength, thus the phase of the light from a mount interface is drifted by 180 deg. from the phase of the light of an external layer interface. Two interface reflections negate each other due to this phase difference, thereby no reflection is generated from the whole system with the selected wavelength.
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公开(公告)号：JP2000089185A
公开(公告)日：2000-03-31
申请号：JP21311699
申请日：1999-07-28
Applicant: LITTON SYSTEMS INC
Inventor： SHAFER KENNETH W , ABBINK HENRY C , RAHN JOHN P , GEOSLING CHRISTINE E , ZIMMERMAN GREGORY A
IPC: H01L33/00 , G02B6/12 , G02B6/30 , G02F1/035 , H01L31/0232
Abstract: PROBLEM TO BE SOLVED: To provide an integrated optical element which is accompanied by performance improved when the element is exposed to a temp. change. SOLUTION: The optical element or the integrated optical element or an MIOC has a top face 12, a +Z face 14 and a -Z face 16. The element is formed of a crystal, such as lithium or niobic acid, having a high electron-optic coefft. The +Z crystal axis elongates outward from the +Z face and the Z-axis is the axis which crosses the same and at which the pyroelectric effect is exhibited for the purpose of directing the parts of the optical elements to be disclosed. The top face is orthogonal with the Z-axis. An input waveguide 18 on the top surface receives a light signal from an input port 20 and passes the signal via a waveguide network to an output waveguide 26 connected to an output port. Part of the +Z and -Z face are at least partly coated with a conductive coating material. The conduction path couples the +Z and -Z face faces to prevent the development of a charge difference between the +Z face and -Z faces in consequence of the temp. change and pyroelectric effect of the optical element.
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公开(公告)号：JP2000047160A
公开(公告)日：2000-02-18
申请号：JP21311799
申请日：1999-07-28
Applicant: LITTON SYSTEMS INC
Inventor： GAMPP LORRIE L , ZIMMERMAN GREGORY A , GEOSLING CHRISTINE E , RAHN JOHN P
Abstract: PROBLEM TO BE SOLVED: To prevent an electric charge difference from being generated between a 1st and a 2nd rail by providing a conduction bridge which is connected to the 1st and 2nd rails to form a conduction network. SOLUTION: The 1st and 2nd rails 38 and 40 which are arranged on the top surface of an optical element are formed of metal on the top surface across part of an input waveguide 18. The conduction bridge consists of a 1st rail conduction segment 54, a 1st joint pad 55, a 2nd rail conduction segment 56, and a 2nd joint pad 57. The 1st and 2nd joint pads 55 and 57 are connected by a conduction jumper bridge 58. Then the circuit consisting of the 1st rail conduction segment 54, 2nd rail conduction segment 56, 1st and 2nd joint pads 54 and 55, and conduction jumper bridge 58 forms the conduction network which operates to prevent an electric charge difference from being generated between the 1st and 2nd rails 30 and 40.
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公开(公告)号：JPH10185585A
公开(公告)日：1998-07-14
申请号：JP31826297
申请日：1997-11-19
Applicant: LITTON SYSTEMS INC
Inventor： CORDOVA AMADO , HOOVER ROBERT J , MCLEAN THOMAS , PATTERSON RALPH A , RAHN JOHN P
Abstract: PROBLEM TO BE SOLVED: To reduce gyro errors by releasing the stress between windings, by providing a means which reduces the thermal stress between a jacket and a burying material. SOLUTION: A surface 26 of the external jacket of the sensor coil composed of an optical fiber 28 is insulated from a surrounding burying material 30 by lubricant layers 32 and 34, which surround the wound layer of a fiber 29. Before starting the winding process of the sensor coil, the lubricant layer applying process, and the burying process of the sensor coil, the burying material 30 is applied to the surface of a supporting mandrel. After the material 30 is applied, the lubricant layer 34 is applied to the surface of the burying material 30 with a brush or spray and the layer of the fiber 28 is wound. After the fiber 28 is wound, the lubricant layer 32 is applied to the surface of the fiber 28 with a spray or brush, and the remaining layer of the burying material 36 is applied. Since the lubricant layers 34 and 32 are respectively provided immediately below and above the fiber 28, the fiber 28 is isolated from the layers 30 and 36 of the burying material 30 by the lubricants.
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公开(公告)号：JPH11153440A
公开(公告)日：1999-06-08
申请号：JP22099398
申请日：1998-06-30
Applicant: LITTON SYSTEMS INC
Inventor： RAHN JOHN P
Abstract: PROBLEM TO BE SOLVED: To reduce the possibility of a winding mistake by forming a detecting coil by use of an optical fiber ribbon. SOLUTION: This method comprises a step of arranging a plurality of optical fibers 1, 2,...N in parallel to each other to form a flat array, and a step of sealing the optical fibers into a soft material while keeping the mutually parallel, relation to form an optical fiber ribbon 10 having a pair of ribbon end parts. The ribbon 10 is spirally wound, and the end parts of the ribbon are mutually branched and connected to form an optical fiber coil having a clockwise input lead wire and a counterclockwise input lead wire. In the most simple embodiment of this structure, the fiber end parts to be branched are constituted in such a manner that one end is displaced in the cross direction by one fiber to the other end. In a more preferable embodiment, the branching order of the fiber end parts to be branched is rearranged so as to provide a quadrupole distribution along the axial direction of the coil.
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Patent Agency Ranking
公开(公告)号：JPH11101646A
公开(公告)日：1999-04-13
申请号：JP21637098
申请日：1998-07-31
Applicant: LITTON SYSTEMS INC
Inventor： RAHN JOHN P , CORDOVA AMADO
Abstract: PROBLEM TO BE SOLVED: To reduce the effect of the temperature change-induced optical path length unbalance based on bias stability by making an optical fiber include an inside cover material made of silicone and a specific filler. SOLUTION: The sensor coil 10 is an important constituting element of an optical fiber gyroscope, and it is fixed to a platform of which revolving speed is to be measured. The sensor coil 10 is wound on a support spool 14, and it is made of an optical fiber 12 operated as a light guide receiving a reverse propagation beam pair emitted from a common light source. The optical fiber 12 contains an inside cover material made of silicone and a proper filler. Carbon black, alumina, a hafnium oxide or silica is used for as proper filler. The bias error caused by temperature change-induced optical path asymmetry is the integration function of optical path length strain, and it can be reduced by introducing a proper filler in the inside cover material of the optical fiber 12.
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公开(公告)号：DE69939444D1
公开(公告)日：2008-10-16
申请号：DE69939444
申请日：1999-07-28
Applicant: LITTON SYSTEMS INC
Inventor： SHAFER KENNETH W , ABBINK HENRY C , RAHN JOHN P , GEOSLING CHRISTINE E , ZIMMERMAN GREGORY A
IPC: G02F1/035 , H01L33/00 , G02B6/12 , G02B6/30 , H01L31/0232
Abstract: An Integrated Optics Chip with improved performance when exposed to changing temperature is disclosed. The optic chip or integrated optic chip or MIOC has a top surface, a +Z face and -Z face. The chip is formed from a crystal having a high electro-optic coefficient such as Lithium Niobate. For the purpose of orienting the components to the optic chip to be described, the +Z crystal axis extends outward from the +Z face, the Z axis being the axis across which a pyroelectric effect is exhibited. The top surface is orthogonal to the Z axis. An input waveguide on the top surface receives an optical signal from an input port, passes the signal via a waveguide network, to an output waveguide coupling the waveguide network to an output port. A portion of the +Z and -Z faces are coated at least partially with a conductive coating. A conductive path couples the +Z and -Z faces to prevent a charge differential from developing between the +Z and -Z faces due to a change in temperature of the optic chip and the pyroelectric effect.
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公开(公告)号：DE19935833A1
公开(公告)日：2000-03-02
申请号：DE19935833
申请日：1999-07-29
Applicant: LITTON SYSTEMS INC
Inventor： CARLSON KURT RANDY , CORDOVA AMADO , RAHN JOHN P
Abstract: Composite material containing a base resin and a thermally conductive filler is used in sensor coils for fiber-optic gyroscopes operating within a predetermined temperature range. An Independent claim is also included for a process for the production of a gyrosensor coil which reduces the sensitivity of the gyroscope to changes in the heat-up rate, comprising: (a) selecting a continuous optical fiber; (b) selecting a silicone binder with a phase transition temperature below the lowest operating temperature of the coil; (c) adding a thermally conductive material to the silicone; (d) winding the optical fiber round a bobbin to a predetermined winding pattern; and (e) bonding the fiber in the coil with the silicone/filler mixture.
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公开(公告)号：FR2784181A1
公开(公告)日：2000-04-07
申请号：FR9909852
申请日：1999-07-29
Applicant: LITTON SYSTEMS INC
Inventor： CARLSON KURT RANDY , CORDOVA AMADO , RAHN JOHN P
Abstract: A potting compound for use in the fabrication of fiber optic gyro sensor coils utilizes a silver-filled silicone base to reduce gyro sensitivity to changes in heat rate and thereby improve gyro performance during warm-up and periods of thermal cycling.
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10.发明专利
公开(公告)号：CA2279068A1
公开(公告)日：2000-01-28
申请号：CA2279068
申请日：1999-07-28
Applicant: LITTON SYSTEMS INC
Inventor： ZIMMERMAN GREGORY A , GEOSLING CHRISTINE E , GAMPP LORRIE L , RAHN JOHN P
Abstract: An Integrated Optics Chip with improved performance when exposed to rapidly changing temperature is disclosed. The optic chip or integrated optic chip or MIOC has a top surface, a +Z face and -Z face. The chip is formed from a crystal having a high electro-optic coefficient such as Lithium Niobate. For the purpose of orienting the components to the optic chip to be described, the +Z crystal axis extends outward from the +Z face. An input waveguide formed in the top surface of the chip and orthogonal to the +Z axis receives an optical signal from an input port, passes the signal via a waveguide network, to an output waveguide coupling the waveguide network to an output port. Metalization is applied to the top face of the optic chip to form at least a first and a second rail. The first and second rails are positioned to very closely straddle a portion of the input waveguide. A conductive bridge connects the first and second rails to prevent a charge differential from developing between the first and second rails.
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