CA2168902A1 - Optical Tapping Filters Employing Long Period Gratings - Google Patents

Optical Tapping Filters Employing Long Period Gratings

Info

Publication number
CA2168902A1
CA2168902A1 CA2168902A CA2168902A CA2168902A1 CA 2168902 A1 CA2168902 A1 CA 2168902A1 CA 2168902 A CA2168902 A CA 2168902A CA 2168902 A CA2168902 A CA 2168902A CA 2168902 A1 CA2168902 A1 CA 2168902A1
Authority
CA
Canada
Prior art keywords
long period
period gratings
guided modes
employing long
filters employing
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2168902A
Other languages
French (fr)
Other versions
CA2168902C (en
Inventor
Ashish Madhukar Vengsarkar
Kenneth Lee Walker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T IPM Corp
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 AT&T IPM Corp filed Critical AT&T IPM Corp
Publication of CA2168902A1 publication Critical patent/CA2168902A1/en
Application granted granted Critical
Publication of CA2168902C publication Critical patent/CA2168902C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
    • G02B6/02085—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the grating profile, e.g. chirped, apodised, tilted, helical
    • G02B6/02095—Long period gratings, i.e. transmission gratings coupling light between core and cladding modes
    • 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
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29331—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by evanescent wave coupling
    • G02B6/29332—Wavelength selective couplers, i.e. based on evanescent coupling between light guides, e.g. fused fibre couplers with transverse coupling between fibres having different propagation constant wavelength dependency
    • G02B6/29334—Grating-assisted evanescent light guide couplers, i.e. comprising grating at or functionally associated with the coupling region between the light guides, e.g. with a grating positioned where light fields overlap in the coupler

Abstract

An optical filter comprises a plurality of optical fibers having a coupling region where the axially extending cores are closely spaced within a common cladding. The coupling region includes a long period grating for selectively shifting light of selected wavelengths from guided modes into non-guided modes. These non-guided modes are picked up by an adjacent core and light of the selected wavelengths is thus shifted from one core to another. The result is an optical filter particularly useful as a demultiplexer or a tapping device. In one embodiment the grating is formed in one of the cores. In an alternative embodiment, it is formed in the common cladding.
CA002168902A 1995-02-24 1996-02-06 Optical tapping filters employing long period gratings Expired - Fee Related CA2168902C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/393,754 US5550940A (en) 1995-02-24 1995-02-24 Optical tapping filters employing long period gratings
US393,754 1995-02-24

Publications (2)

Publication Number Publication Date
CA2168902A1 true CA2168902A1 (en) 1996-08-25
CA2168902C CA2168902C (en) 1999-03-30

Family

ID=23556104

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002168902A Expired - Fee Related CA2168902C (en) 1995-02-24 1996-02-06 Optical tapping filters employing long period gratings

Country Status (4)

Country Link
US (1) US5550940A (en)
EP (1) EP0729043A3 (en)
JP (1) JPH08248229A (en)
CA (1) CA2168902C (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9324456D0 (en) 1993-11-29 1994-01-12 Univ Southampton Waveguide coupler
GB9503781D0 (en) * 1994-05-19 1995-04-12 Univ Southampton External cavity laser
US5768452A (en) * 1996-04-17 1998-06-16 Lucent Technologies Inc. Radiolytic method for trimming planar waveguide couplers
US5778119A (en) * 1996-10-08 1998-07-07 Jds Fitel Inc. In-line grating device for forward coupling light
US6631224B2 (en) * 1997-06-06 2003-10-07 Novera Optics, Inc. Tunable filter with core mode blocker
US6801686B2 (en) * 1997-06-06 2004-10-05 Novera Optics, Inc. Methods and apparatus for measuring the power spectrum of optical signals
US6850655B2 (en) 1997-06-16 2005-02-01 Novera Optics, Inc. Optical apparatus with faraday rotator, static gain flattening filter and variable optical attenuator
US6058226A (en) * 1997-10-24 2000-05-02 D-Star Technologies Llc Optical fiber sensors, tunable filters and modulators using long-period gratings
WO1999030445A1 (en) 1997-12-08 1999-06-17 Sumitomo Electric Industries, Ltd. Dispersion compensation module
US6011881A (en) * 1997-12-29 2000-01-04 Ifos, Intelligent Fiber Optic Systems Fiber-optic tunable filter
US6222973B1 (en) 1999-01-15 2001-04-24 D-Star Technologies, Inc. Fabrication of refractive index patterns in optical fibers having protective optical coatings
US6528239B1 (en) * 1999-01-15 2003-03-04 Sabeus Photonics, Inc. Method of forming a grating in a waveguide
US6360038B1 (en) 1999-05-12 2002-03-19 Sabeus Photonics, Inc. Wavelength-selective optical fiber components using cladding-mode assisted coupling
US6850665B2 (en) * 1999-05-12 2005-02-01 Sabeus Photonics Wavelength-selective optical fiber components using cladding-mode assisted coupling
US6445855B1 (en) * 1999-05-25 2002-09-03 Thomas & Betts International, Inc. Method of fabricating fused and tapered couplers from optical fibers having photosensitive cladding regions
US6529676B2 (en) 2000-12-08 2003-03-04 Lucent Technologies Inc. Waveguide incorporating tunable scattering material
US6826343B2 (en) 2001-03-16 2004-11-30 Cidra Corporation Multi-core waveguide
WO2013134575A1 (en) * 2012-03-07 2013-09-12 Ofs Fitel, Llc Grating-based sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737007A (en) * 1986-02-24 1988-04-12 American Telephone And Telegraph Company, At&T Bell Laboratories Narrow-band wavelength selective optical coupler
JP3005996B2 (en) * 1989-07-14 2000-02-07 日本電気株式会社 Waveguide optical demultiplexer and method of manufacturing the same
CA2022367C (en) * 1990-07-31 2002-12-17 Kenneth O. Hill Simplified wdm fused fiber coupler design

Also Published As

Publication number Publication date
CA2168902C (en) 1999-03-30
JPH08248229A (en) 1996-09-27
EP0729043A2 (en) 1996-08-28
US5550940A (en) 1996-08-27
EP0729043A3 (en) 1997-01-29

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