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
Japan
Prior art keywords
light
width
coupling
gratings
constant
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
Other languages
Japanese (ja)
Inventor
Nobuyuki Imoto
Masahiro Ikeda
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP14820080A priority Critical patent/JPS5772119A/en
Publication of JPS5772119A publication Critical patent/JPS5772119A/en
Pending 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
    • G02B6/24—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Integrated Circuits (AREA)

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 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 TAKING OF OPTICAL ENERGY FROM AN OPTICAL FIBER AND MULTIPLEXER / DEMULTIPLEXER USING THE SAME
EP0234828A2 (en) * 1986-02-24 1987-09-02 AT&T Corp. Narrow-band wavelength selective optical coupler
US20160054521A1 (en) * 2014-08-21 2016-02-25 Renesas Electronics Corporation Optical semiconductor device, and method for producing the same

Cited By (7)

* 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 TAKING OF OPTICAL ENERGY FROM AN OPTICAL FIBER AND MULTIPLEXER / DEMULTIPLEXER USING THE SAME
EP0234828A2 (en) * 1986-02-24 1987-09-02 AT&T Corp. Narrow-band wavelength selective optical coupler
JPS62198806A (en) * 1986-02-24 1987-09-02 アメリカン　テレフオン　アンド　テレグラフ　カムパニ− Optical signal coupler
US20160054521A1 (en) * 2014-08-21 2016-02-25 Renesas Electronics Corporation Optical semiconductor device, and method for producing the same
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
US10295743B2 (en) 2014-08-21 2019-05-21 Renesas Electronics Corporation Optical semiconductor device, and method for producing the same

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