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公开(公告)号：NO851594L
公开(公告)日：1985-11-26
申请号：NO851594
申请日：1985-04-22
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
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公开(公告)号：NO844693A
公开(公告)日：1985-06-06
申请号：NO844693
申请日：1984-11-26
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
IPC: G02B5/30 , G02B6/00 , G02B6/024 , G02B6/10 , G02B6/14 , G02B6/26 , G02B6/28 , G02B6/34 , G02B27/28 , G02F1/01 , G02B
CPC classification number: G02B6/105 , G02B6/2733 , G02B6/2766 , G02B6/2804 , G02F1/0134 , G02F1/0136 , Y10S359/90
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公开(公告)号：DE69808694D1
公开(公告)日：2002-11-21
申请号：DE69808694
申请日：1998-05-20
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: Attenuation of an optical signal (25) at the end (43) of an optical fiber (21) is achieved by positioning a high absorption region (24) at the end of the fiber. A first embodiment teaches a highly doped annulus (24) within a tapered end (5) of the fiber. The highly doped annulus about the light transmitting core (22) serves to absorb light at the end of the fiber. The light transmitting core of the fiber is reduced in diameter due to the tapering, causing the field of light to expand beyond the core. The highly doped annulus is in proximity to the core due to the tapering. The annulus, which is preferably heavily doped with a rare earth such as erbium, absorbs the escaping light in sufficient quantities, both in the initial pass through the tapered region and again upon reflection of the light at the end of the tapered region, such that the attenuation of the reflected light is within acceptable limits without regard to the condition of the fiber's end surface.
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公开(公告)号：CA2210843A1
公开(公告)日：1999-01-17
申请号：CA2210843
申请日：1997-07-17
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: The optical interconnection apparatus includes one or more terminator blocks whi ch hold a plurality of jacketed optical fibers and a flexible matrix which encloses the ja cketed optical fibers and partially surrounds the terminator blocks so as to anchor the terminator blo cks within the matrix. Each terminator block comprises a jacket holder and a jacket clamp. The jacket h older has a surface with a plurality of grooves for receiving a plurality of jacketed optical fibers . The jacket clamp clamps a plurality of jacketed optical fibers in the plurality of grooves of a j acket holder. The terminator blocks are used with a mold having one or more guide structures for u se in guiding each of the terminator blocks into the mold, a terminator block having one or more gu ide followers which engage and follow the guide structures of the mold when the terminator block is inserted into the mold. The optical interconnection apparatus further comprises one or more connec tor blocks, each of which is attachable to two terminator blocks. The connector block holds the b are optical fibers protruding from a terminator block when the connector block is attached to the t erminator block and bare optical fibers are protruding from the terminator block. Each connector blo ck comprises a fiber holder and a fiber clamp. The fiber holder has a surface with a plurality of gro oves dimensioned to receive a plurality of bare optical fibers. The fiber clamp provides the means f or clamping the bare optical fibers in the grooves of a fiber holder.
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公开(公告)号：AU5414496A
公开(公告)日：1997-07-28
申请号：AU5414496
申请日：1995-12-28
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: A method for modulating a fiber optic gyroscope achieves a reduction in output noises beyond that possible through increased peak power with conventional phase modulation. A periodic modulation waveform (28) is applied to an electro-optic modulator, such as an MIOC, to induce a periodic phase shift phi M(t) where the form of the periodic phase shift is chosen such that the gyro random walk is below that associated with maximum output signal modulation.
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Patent Agency Ranking
公开(公告)号：DE3929999C2
公开(公告)日：1997-03-27
申请号：DE3929999
申请日：1989-09-08
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: Devices and methods for use in integrated optics waveguide circuits containing Y-junctions are presented for intercepting and either absorbing or otherwise removing radiation which has leaked into the substrate in order that such leaked radiation cannot re-enter the waveguide circuit and cause signal errors.
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公开(公告)号：FR2642843B1
公开(公告)日：1995-06-02
申请号：FR9000805
申请日：1990-01-24
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: A closed loop fiber optic rotation sensing system prevents the occurrence of instabilities in its feedback signal by modulating the counterpropagating waves with a reference signal and demodulating an electrical signal indicative of the phase difference of two counterpropagating waves with the reference signal. The modulating means is driven to null the phase difference between the counterpropagating waves, and the feedback signal is adjusted to prevent instability. The counterpropagating waves may be either phase modulated or shifted in frequency. The means for modulating the counterpropagating waves may comprise a fiber optic frequency shifter connected to the fiber optic sensing coil and means for applying the reference signal to the frequency shifter. The feedback signal is adjusted with either a pseudo-random or a periodic signal having a zero mean value to prevent instability.
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公开(公告)号：GB2227834B
公开(公告)日：1993-02-17
申请号：GB8927540
申请日：1989-12-06
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
Abstract: A closed loop fiber optic rotation sensing system prevents the occurrence of instabilities in its feedback signal by modulating the counterpropagating waves with a reference signal and demodulating an electrical signal indicative of the phase difference of two counterpropagating waves with the reference signal. The modulating means is driven to null the phase difference between the counterpropagating waves, and the feedback signal is adjusted to prevent instability. The counterpropagating waves may be either phase modulated or shifted in frequency. The means for modulating the counterpropagating waves may comprise a fiber optic frequency shifter connected to the fiber optic sensing coil and means for applying the reference signal to the frequency shifter. The feedback signal is adjusted with either a pseudo-random or a periodic signal having a zero mean value to prevent instability.
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公开(公告)号：CA2034899A1
公开(公告)日：1991-10-07
申请号：CA2034899
申请日：1991-01-24
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
IPC: G01C19/72 , G02B6/12 , G02B6/122 , G02B6/125 , G02B6/126 , G02B6/28 , G02B6/26 , G02B6/42 , G02B27/12
Abstract: An integrated optics coupler comprises two input paths (24,26) and at least one output path formed as a Y-shaped assembly of two mono-modal optical waveguides (24,26) joined at a node (22) with a central multi-modal optical waveguide (52). The central multi-modal optical waveguide has an output end. There are two output paths (32,34) formed as a Y-shaped assembly of two output mono-modal optical waveguides joined at the output end of the central multi-modal optical waveguide (52). The assemblies are formed inside a refractive medium having a lower refractive index than the refractive index of the waveguides. The central multi-modal optical waveguide has an elongated multi-modal waveguide (54) for decorrelating symmetric mode light passing through the cental multi-modal optical waveguide with respect to anti-symmetric mode light passing through the substrate to the second integrated optics junction coupled to a tapered waveguide segment (66).
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公开(公告)号：DE3581109D1
公开(公告)日：1991-02-07
申请号：DE3581109
申请日：1985-04-12
Applicant: LITTON SYSTEMS INC
Inventor： PAVLATH GEORGE A
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