JPS5772119A - Optical branching filter - Google Patents

Optical branching filter

Info

Publication number
JPS5772119A
JPS5772119A JP14820080A JP14820080A JPS5772119A JP S5772119 A JPS5772119 A JP S5772119A JP 14820080 A JP14820080 A JP 14820080A JP 14820080 A JP14820080 A JP 14820080A JP S5772119 A JPS5772119 A JP S5772119A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
light
width
coupling
constant
part
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.)
Pending
Application number
JP14820080A
Inventor
Masahiro Ikeda
Nobuyuki Imoto
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

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
    • G02B6/29331Optical 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
    • G02B6/29332Wavelength 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
    • G02B6/29334Grating-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

PURPOSE:To suppress the reflection to an incident waveguide per se by providing gratings of required periods on the inner and outer sides of one core of the coupling part of two pieces of waveguides which are approximate to each other in parallel, thereby making core width constant. CONSTITUTION:Clads 29-31 of refractive insides, n3, n0, n2 and cores 27, 22 of n1 and d1, n2 and d2 refractive indices and width are in proximity in parallel to each other, whereby a photocoupling part is formed in the part where the width d0 of the clad 30 is constant. Gratings 28B, 28A are provided on the inner and outer sides of the core 23 in this coupling part by making the width d1 constant, and the periods A of the gratings 28A, 28B are so selected as to satisfy A=2pi/(beta1+beta2). Then, the coupling to the light incident from an incident end 23 and escaping through an exit end 24, the light returning to the end 23, and the light shifting to an exit end 26 weakens and these beams of light are suppressed, by which the coupling of the exit light to an exit end 25 is intensified and the high performance optical branching filter is obtained with the simple constitution. (lambda0 is wavelength, beta1, beta2 are the transmission constants of the cores 21, 22)
JP14820080A 1980-10-24 1980-10-24 Optical branching filter Pending JPS5772119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14820080A JPS5772119A (en) 1980-10-24 1980-10-24 Optical branching filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14820080A JPS5772119A (en) 1980-10-24 1980-10-24 Optical branching filter

Publications (1)

Publication Number Publication Date
JPS5772119A true true JPS5772119A (en) 1982-05-06

Family

ID=15447491

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14820080A Pending JPS5772119A (en) 1980-10-24 1980-10-24 Optical branching filter

Country Status (1)

Country Link
JP (1) JPS5772119A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60175024A (en) * 1984-02-21 1985-09-09 Nippon Telegr & Teleph Corp <Ntt> Optical demultiplexer
FR2567654A1 (en) * 1984-07-11 1986-01-17 Int Standard Electric Corp Method and device for the selective optical energy Levy on an optical fiber and multiplexer / demultiplexer by applying
JPS62198806A (en) * 1986-02-24 1987-09-02 American Telephone & Telegraph Optical signal coupler
JP2016045294A (en) * 2014-08-21 2016-04-04 ルネサスエレクトロニクス株式会社 Optical semiconductor device and fabrication method of the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60175024A (en) * 1984-02-21 1985-09-09 Nippon Telegr & Teleph Corp <Ntt> Optical demultiplexer
FR2567654A1 (en) * 1984-07-11 1986-01-17 Int Standard Electric Corp Method and device for the selective optical energy Levy on an optical fiber and multiplexer / demultiplexer by applying
JPS62198806A (en) * 1986-02-24 1987-09-02 American Telephone & Telegraph Optical signal coupler
EP0234828A2 (en) * 1986-02-24 1987-09-02 AT&amp;T Corp. Narrow-band wavelength selective optical coupler
JP2016045294A (en) * 2014-08-21 2016-04-04 ルネサスエレクトロニクス株式会社 Optical semiconductor device and fabrication method of the same

Similar Documents

Publication Publication Date Title
US4415227A (en) Transition between two single mode optical waveguides
US6850665B2 (en) Wavelength-selective optical fiber components using cladding-mode assisted coupling
US5457758A (en) Add-drop device for a wavelength division multiple, fiber optic transmission system
US3832028A (en) Coupler for optical waveguide light source
US6535678B1 (en) Multimode optical fiber with a higher order mode removing function
US5940556A (en) Fiber-optic mode-routed add-drop filter
US7272287B2 (en) Optical fiber filter for suppression of amplified spontaneous emission
US4021099A (en) Optical couplers for fiber optic communication links
US4360372A (en) Fiber optic element for reducing speckle noise
US5887094A (en) Band-pass filter in an optical waveguide
US6876791B2 (en) Diffraction grating device
US4950045A (en) Single mode couplers
JPS54101334A (en) Optical fiber coupling element and production of the same
JPH023A (en) Method of accessing optical fiber circuit and connector plug thereof
US5550940A (en) Optical tapping filters employing long period gratings
Mizrahi et al. Four channel fibre grating demultiplexer
US3813141A (en) Single material optical fiber structures including thin film supporting members
EP0371675A2 (en) Non-invasive optical coupler
GB2003294A (en) Optical fibre coupling
US4113345A (en) Branching arrangement for communication transmission links having optical glass fibers
US5838853A (en) Optical waveguide
JPH01163707A (en) Optical fiber
JPS5685702A (en) Variable attenuator
JPH02222187A (en) Multi-wavelength glass waveguide laser array
US4976512A (en) Narrowband fiberoptic spectral filter formed from fibers having a refractive index with a W profile and a step profile