WO2001075503A3 - Variable optical attenuator - Google Patents

Variable optical attenuator Download PDF

Info

Publication number
WO2001075503A3
WO2001075503A3 PCT/GB2001/001559 GB0101559W WO0175503A3 WO 2001075503 A3 WO2001075503 A3 WO 2001075503A3 GB 0101559 W GB0101559 W GB 0101559W WO 0175503 A3 WO0175503 A3 WO 0175503A3
Authority
WO
WIPO (PCT)
Prior art keywords
shutter
optical fibres
variable optical
optical attenuator
gap
Prior art date
Application number
PCT/GB2001/001559
Other languages
French (fr)
Other versions
WO2001075503A2 (en
Inventor
Adrian Janssen
Original Assignee
Nortel Networks Ltd
Adrian Janssen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nortel Networks Ltd, Adrian Janssen filed Critical Nortel Networks Ltd
Priority to AU46689/01A priority Critical patent/AU4668901A/en
Publication of WO2001075503A2 publication Critical patent/WO2001075503A2/en
Publication of WO2001075503A3 publication Critical patent/WO2001075503A3/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
    • G02B6/353—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being a shutter, baffle, beam dump or opaque element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
    • G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3592—Means for removing polarization dependence of the switching means, i.e. polarization insensitive switching
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
    • G02B6/3548—1xN switch, i.e. one input and a selectable single output of N possible outputs
    • G02B6/3552—1x1 switch, e.g. on/off switch
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
    • G02B6/3582—Housing means or package or arranging details of the switching elements, e.g. for thermal isolation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3594—Characterised by additional functional means, e.g. means for variably attenuating or branching or means for switching differently polarized beams

Abstract

A micro-mechanical attenuator comprising a straight-edged occulting shutter moved across into the small gap between the ends of two co-aligned single mode optical fibres, or the gap between two beam-expanding lens-terminated optical fibres, is found to introduce a measure of polarisation sensitivity that may be unacceptably large for certain applications, whether that shutter is electrically conductive or not. (Different phenomena are involved in the two instances.) By appropriate shaping of the leading edge of the shutter so that it presents a mirror symmetry of orthogonally oriented edge portions to the beam that it occults, this polarisation sensitivity can be substantially eliminated.
PCT/GB2001/001559 2000-04-05 2001-04-04 Variable optical attenuator WO2001075503A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46689/01A AU4668901A (en) 2000-04-05 2001-04-04 Variable optical attenuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54325400A 2000-04-05 2000-04-05
US09/543,254 2000-04-05

Publications (2)

Publication Number Publication Date
WO2001075503A2 WO2001075503A2 (en) 2001-10-11
WO2001075503A3 true WO2001075503A3 (en) 2002-08-01

Family

ID=24167226

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/001559 WO2001075503A2 (en) 2000-04-05 2001-04-04 Variable optical attenuator

Country Status (2)

Country Link
AU (1) AU4668901A (en)
WO (1) WO2001075503A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2379746A (en) * 2001-09-18 2003-03-19 Marconi Caswell Ltd Shutter assembly for telecommunication networks
GB0201969D0 (en) 2002-01-29 2002-03-13 Qinetiq Ltd Integrated optics devices
KR20030069488A (en) * 2002-02-20 2003-08-27 주식회사 엘지이아이 Variable optical attenuator
KR100490754B1 (en) 2002-11-15 2005-05-24 한국전자통신연구원 Variable optical attenuator with tunable wavelength dependence

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2186203A (en) * 1937-12-11 1940-01-09 Centeno Melchor Optical filter
US4812913A (en) * 1987-01-24 1989-03-14 Dr. Ing. Rudolf Hell Gmbh Diaphragm arrangement for opto-electronic scanning of originals
DE3744060A1 (en) * 1987-12-22 1989-07-13 Juergen Krebs Optical arrangement for high-performance slide projectors
US5068679A (en) * 1989-04-28 1991-11-26 Olympus Optical Co., Ltd. Imaging system for macrophotography
EP0565069A1 (en) * 1992-04-10 1993-10-13 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Adjustable diaphragm and manufacturing process
WO1995025292A1 (en) * 1994-03-17 1995-09-21 Thomson Training & Simulation Limited Edge-blending of projected images
FR2774481A1 (en) * 1998-01-27 1999-08-06 Chung Shan Inst Of Science Filter for preventing edge misalignment in adjacent projected images
US6163643A (en) * 1998-08-12 2000-12-19 Lucent Technologies Inc. Micro-mechanical variable optical attenuator
US6167185A (en) * 1998-11-24 2000-12-26 Jds Fitel Inc. Adjustable optical attenuator
WO2001041455A1 (en) * 1999-11-29 2001-06-07 Barco N.V. Optical soft edge matching method for light valve projectors

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2186203A (en) * 1937-12-11 1940-01-09 Centeno Melchor Optical filter
US4812913A (en) * 1987-01-24 1989-03-14 Dr. Ing. Rudolf Hell Gmbh Diaphragm arrangement for opto-electronic scanning of originals
DE3744060A1 (en) * 1987-12-22 1989-07-13 Juergen Krebs Optical arrangement for high-performance slide projectors
US5068679A (en) * 1989-04-28 1991-11-26 Olympus Optical Co., Ltd. Imaging system for macrophotography
EP0565069A1 (en) * 1992-04-10 1993-10-13 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Adjustable diaphragm and manufacturing process
WO1995025292A1 (en) * 1994-03-17 1995-09-21 Thomson Training & Simulation Limited Edge-blending of projected images
FR2774481A1 (en) * 1998-01-27 1999-08-06 Chung Shan Inst Of Science Filter for preventing edge misalignment in adjacent projected images
US6163643A (en) * 1998-08-12 2000-12-19 Lucent Technologies Inc. Micro-mechanical variable optical attenuator
US6167185A (en) * 1998-11-24 2000-12-26 Jds Fitel Inc. Adjustable optical attenuator
WO2001041455A1 (en) * 1999-11-29 2001-06-07 Barco N.V. Optical soft edge matching method for light valve projectors

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BROTTON J: "REMOTE SENSING COULD EMERGE AS A MAJOR ROLE FOR FIBRE OPTICS", CONTROL AND INSTRUMENTATION, vol. 13, 1981, LONDON, ENGLAND, pages 45 - 46, XP002191941 *
C. RANDY GILES: "Lightwave Micromachines", ECOC '98, vol. 1, 20 September 1998 (1998-09-20) - 24 September 1998 (1998-09-24), Madrid, Spain, pages 249 - 250, XP002191781 *

Also Published As

Publication number Publication date
WO2001075503A2 (en) 2001-10-11
AU4668901A (en) 2001-10-15

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