JPS5640804A - Optical branching filter - Google Patents

Optical branching filter

Info

Publication number
JPS5640804A
JPS5640804A JP11669579A JP11669579A JPS5640804A JP S5640804 A JPS5640804 A JP S5640804A JP 11669579 A JP11669579 A JP 11669579A JP 11669579 A JP11669579 A JP 11669579A JP S5640804 A JPS5640804 A JP S5640804A
Authority
JP
Japan
Prior art keywords
light
diffraction grating
filter
angles
incident
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
JP11669579A
Other languages
Japanese (ja)
Other versions
JPS5654607B2 (en
Inventor
Takaichi Watanabe
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
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 Nippon Telegr & Teleph Corp <Ntt> filed Critical Nippon Telegr & Teleph Corp <Ntt>
Priority to JP11669579A priority Critical patent/JPS5654607B2/ja
Publication of JPS5640804A publication Critical patent/JPS5640804A/en
Publication of JPS5654607B2 publication Critical patent/JPS5654607B2/ja
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical 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
    • G02B6/29304Optical 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 diffraction, e.g. grating
    • G02B6/29305Optical 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 diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/2931Diffractive element operating in reflection
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical 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
    • G02B6/29346Optical 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 wave or beam interference
    • G02B6/29361Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/29362Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical 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
    • G02B6/29379Optical 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 characterised by the function or use of the complete device
    • G02B6/2938Optical 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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM

Abstract

PURPOSE:To widen the range of the wavelengths to be used by inserting a multilayer film filter between the lens of a diffraction grating optical branching filter and a diffraction grating, newly providing a diffraction grating diffracting the reflected light thereof and so disposing the two diffraction gratings that they have the blaze angles conforming to the incident light and the angles that their normals and the incident light assume become tha blaze angles. CONSTITUTION:The incident light from an incident optical fiber 3 is made into parallel luminous fluxes by a lens 2. The light transmitted through a dielectric multilayer film filter 5 enters a diffraction grating 1 and the light reflected by the filter 5 enters a diffraction grating 1'. The diffraction gratings 1, 1' have beforehand been blazed to match the wavelength of the light incident thereto respectively. The diffraction gratings 1, 1' are so disposed that the angles that their normals and the incident light assume becomes the blaze angles. The monochromatic rays lambda1, lambda2,... diffracted by the diffraction gratings 1, 1' are transmitted or reflected through the filter 5, and are taken out from exit optical fibers 4 by the lens 2. Since two diffraction gratings are used, the range of the light that can be used is expanded.
JP11669579A 1979-09-13 1979-09-13 Expired JPS5654607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11669579A JPS5654607B2 (en) 1979-09-13 1979-09-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11669579A JPS5654607B2 (en) 1979-09-13 1979-09-13

Publications (2)

Publication Number Publication Date
JPS5640804A true JPS5640804A (en) 1981-04-17
JPS5654607B2 JPS5654607B2 (en) 1981-12-26

Family

ID=14693559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11669579A Expired JPS5654607B2 (en) 1979-09-13 1979-09-13

Country Status (1)

Country Link
JP (1) JPS5654607B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721723U (en) * 1980-07-11 1982-02-04
JPS5860721A (en) * 1981-09-07 1983-04-11 Philips Nv Apparatus for separating radiation beam emitted from optical fiber
JPS58194011A (en) * 1982-05-10 1983-11-11 Nippon Telegr & Teleph Corp <Ntt> Optical demultiplexer of two-way transmission
US4723829A (en) * 1982-10-12 1988-02-09 U.S. Philips Corporation Optical wavelength demultiplexer
JPS63115126A (en) * 1986-11-04 1988-05-19 Canon Inc Photographic lens with vibration-proof function
JPH02122224A (en) * 1988-10-31 1990-05-09 Kurabo Ind Ltd Color consecutively measuring device
US5168403A (en) * 1989-12-07 1992-12-01 Minolta Camera Co., Ltd. Zoom lens system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721723U (en) * 1980-07-11 1982-02-04
JPS5811862Y2 (en) * 1980-07-11 1983-03-07
JPS5860721A (en) * 1981-09-07 1983-04-11 Philips Nv Apparatus for separating radiation beam emitted from optical fiber
JPS58194011A (en) * 1982-05-10 1983-11-11 Nippon Telegr & Teleph Corp <Ntt> Optical demultiplexer of two-way transmission
JPS6216404B2 (en) * 1982-05-10 1987-04-13 Nippon Telegraph & Telephone
US4723829A (en) * 1982-10-12 1988-02-09 U.S. Philips Corporation Optical wavelength demultiplexer
JPS63115126A (en) * 1986-11-04 1988-05-19 Canon Inc Photographic lens with vibration-proof function
JPH02122224A (en) * 1988-10-31 1990-05-09 Kurabo Ind Ltd Color consecutively measuring device
US5168403A (en) * 1989-12-07 1992-12-01 Minolta Camera Co., Ltd. Zoom lens system

Also Published As

Publication number Publication date
JPS5654607B2 (en) 1981-12-26

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