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公开(公告)号：JPH10142413A
公开(公告)日：1998-05-29
申请号：JP28327697
申请日：1997-10-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KOHNKE GLENN ERIC , STRASSER THOMAS A
Abstract: PROBLEM TO BE SOLVED: To provide a method and device for manufacturing an optical fiber plug grating which is continuously chirped. SOLUTION: The continuously chirped optical fiber plug grating is made by writing-in the plug grating on an optical fiber by using a phase mask continuously chirped. The chirped phase mask is made by exposing a mask substrate 23 coated with a photoresist to two interference beams 24, 25 in which one of beams is a colimated beam and another is a beam reflected at a smoothly curved mirror 26. The optical fiber grating has a broadened band width and an uniform dispersion delay characteristic which is effective against dispersion compensation in high-degree communication application.
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公开(公告)号：JPH1154853A
公开(公告)日：1999-02-26
申请号：JP15700798
申请日：1998-06-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： REED WILLIAM ALFRED , STENTZ ANDREW J , STRASSER THOMAS A
Abstract: PROBLEM TO BE SOLVED: To provide a cascaded Raman laser(CRL), which significantly increases conversion efficiency and is highly reliable. SOLUTION: In a CRL 30, which receives pumping radiation light of a wavelength λp and radiates emitted light of a wavelength λn which is longer than the wavelength λp , the CRL 30 consists of an optical fiber, which has L long cavities 21 arranged between an input region 34 and an output region 35 and has a certain length, the above input and output regions 34 and 35 respectively have fiber plug gratings having center wavelengths of λ1
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公开(公告)号：JP2000066120A
公开(公告)日：2000-03-03
申请号：JP32117398
申请日：1998-11-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ABRAMOV ANATOLI A , HALE ARTURO , MOCK JOEL LESLIE , STRASSER THOMAS A , VENGSARKAR ASHISH MADHUKAR
Abstract: PROBLEM TO BE SOLVED: To obtain a method capable of monitoring a multiple wavelength optical system without using costly elements, such as detector arrays and an apparatus therefor. SOLUTION: The physical parameters of the intra-fiber gratings for coupling the light used in the wavelength division multiplex(WDM) optical fiber system between the spatially different mode are scanned, i.e., changed. The space modes are separated by using a mode discrimination device(MDD) 47 and the spectral components separated by the conventional or other suitable detectors 48 are monitored, i.e., detected. The peak wavelength of the coupling the two different modes to each other is changed and the coupling in the fiber optical system is controlled by scanning the intra-fiber gratings. This system uses the long- period gratings for coupling the spatially different modes for propagating the light in the two same direction to each other or the short-period gratings for coupling the mode for propagating the light in a forward direction and the mode for propagating the light in the opposite direction spatially different therefrom to each other.
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公开(公告)号：JPH10133054A
公开(公告)日：1998-05-22
申请号：JP29851597
申请日：1997-10-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STRASSER THOMAS A , WAGENER JEFFERSON LYNN
Abstract: PROBLEM TO BE SOLVED: To provide an article which includes an optical wavelength tap capable of preventing undesirable polarization effect from being received. SOLUTION: The dispersing optical waveguide tap includes a brazed chirped refractive index diffraction grating 14, a coupling means 15, and a utilizing means 19 in the core of a waveguide 12. In the presence of the coupling means 15, the diffraction grating 14 is so selected that guide mode light with specific wavelength is guided to >=1 clad mode of the waveguide 12. The presence of the coupling means 15 which optically operates with the waveguide 12 varies the guide state so that a clad mode is substantially removed from the part of the waveguide including a clad, and the diffraction grating 14 guides the guide mode light to >=1 emission mode. The utilizing means 19 includes, for example, an array of optical detectors and the coupling means 15 includes a glass member in a proper shape and a refractive index matching means.
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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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Patent Agency Ranking6.发明专利
公开(公告)号：JPH11223737A
公开(公告)日：1999-08-17
申请号：JP29267798
申请日：1998-10-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HENRY CHARLES H , MADSEN CHRISTI KAY , STRASSER THOMAS A
Abstract: PROBLEM TO BE SOLVED: To provide an article such as a wavelength division multiplexer using a Bragg reflection Mach-Zehnder filter in which dependence on a coupler is reduced. SOLUTION: This Bragg reflection Mach-Zehnder filter 30 includes two plane optical waveguides 12 and 13, and each waveguide 12 and 13 includes interference arms 16 and 17 extended between two connecting areas. Each interference 16 and 17 is provided with a refractive index Bragg diffraction grating 18. This filter receives an optical input signal by one of the waveguides 12 and 13, and outputs a transmission signal transmitted through the Bragg diffraction grating 18 and a reflected signal reflected by the Bragg diffraction grating 18. In this case, the interference arms 16 and 17 introduce a πphase difference to the transmission signal, and the phase difference is not introduced to the reflected signal.
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公开(公告)号：JPH10246873A
公开(公告)日：1998-09-14
申请号：JP964098
申请日：1998-01-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： JIN SUNGHO , LEMAIRE PAUL JOSEPH , STRASSER THOMAS A
IPC: G02B26/08 , G02B5/18 , G02B6/02 , G02B6/34 , G02B26/00 , G02F1/01 , H04J14/00 , H04J14/02 , G02B6/10 , G02B6/16
Abstract: PROBLEM TO BE SOLVED: To impart a wide tuning range and to unnecessitate continuous electric power by composing the device for inducing force between magnets and generating grating distortion by imparting magnetic field by an electromagnet. SOLUTION: A fiber grating has an optical fiber 11 of some length including a grating 12 composed of an area 13 whose refractive index is changed. The fiber in the grating area is fixed between a pair of magnets 14, 15 transferring force to the grating 12 by adhesion or mechanical attachment. A single or plural magnets (solenoids) realizing controllable magnetic field between them are arranged adjacent to the magnets 14, 15. In this case, when the same magnetic poles are adjacent the magnet is separated by magnetic force in the extending direction of the fiber grating. Reversely, when the reverse magnetic poles of the magnets 14, 15 are adjacent, the magnetic field from the electromagnets 16, 17 generates compressive distortion in the grating.
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公开(公告)号：JPH10246872A
公开(公告)日：1998-09-14
申请号：JP963998
申请日：1998-01-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GLASS ALASTAIR MALCOLM , JIN SUNGHO , LEMAIRE PAUL JOSEPH , STRASSER THOMAS A
IPC: G02B26/08 , G02B6/02 , G02B6/34 , G02B26/00 , G02F1/01 , H04B10/02 , H04B10/43 , G02B6/10 , G02B6/16 , H04B10/28
Abstract: PROBLEM TO BE SOLVED: To obtain a tunable fiber grating which has a wider tuning range and does not require continuous electric power. SOLUTION: The tunable fiber grating 10 is fixed to a magnetostrictive main body 14 and magnetic strain is transmitted to a grating 12. An electromagnet is arranged adjacently to the magnetostrictive main body 14 and a magnetic field is applied along the magnetostrictive main body 14. A current applied to the electromagnet is controlled to control a force transmitted to the fiber grating 10, i.e., the interval and reflection frequency of the grating 12. The magnetostrictive main body 14 is a column fixed along the grating 12. Further, magnetostrictive effect is mechanically amplified. Further, an addition/extraction multiplexer which uses the tuable fiber grating 10 is described.
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公开(公告)号：JPH10104454A
公开(公告)日：1998-04-24
申请号：JP24845297
申请日：1997-09-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STRASSER THOMAS A
Abstract: PROBLEM TO BE SOLVED: To improve the combination of the even and odd space modes of a mode-combined grating optical waveguide by using a specific blaze refractive index grating. SOLUTION: This device is composed of a multimode optical waveguide length 83 which guides electromagnetic radiations with wavelengths λ1 and λj in a range of spectrum width Δλ. This optical waveguide length 83 consists of the blaze refractive index grating 84 which has a pitch A and a blaze angle θ, and the pitch Λ and blaze angle θ are so selected that the symmetrical basic space mode and high-order space mode of the electromagnetic radiation of wavelength λi are combined. Then the grating is such a short-cycle refractive index grating that Λ
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公开(公告)号：DE69801632D1
公开(公告)日：2001-10-18
申请号：DE69801632
申请日：1998-11-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ABRAMOV ANATOLI A , HALE ARTURO , MOCK JOEL LESLIE , STRASSER THOMAS A , VENGSARKAR ASHISH MADHUKAR
Abstract: Apparatus for monitoring multi-wavelength optical systems includes an optical fiber system (44) and apparatus (42) for separating the different wavelengths of transmitted light transmitted therethrough and for monitoring the respective optical power in the separated spectral components. More specifically, embodiments of the invention scan or modify the physical parameters of in-fiber gratings (46) that couple light between spatially different modes of light within a wavelength-division-multiplexed optical fiber system, separate the spatial modes using a mode-discriminating device (47) and monitor or detect the separated spectral components using a conventional or other suitable detector (48). By scanning the in-fiber gratings, the peak wavelength of coupling between two dissimilar modes is modified, thus allowing control of the coupling within the fiber optic system. Scanning the grating is performed, for example, by changing the temperature or modifying the physical dimensions of the grating. In one embodiment, the system employs a long-period grating that couples light between two co-propagating, spatially different modes. In an alternative embodiment, the system uses a short-period grating that couples light between a forward propagating mode and a spatially dissimilar, backward propagating mode.
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