JPS5478145A - Optical branching filter - Google Patents

Optical branching filter

Info

Publication number
JPS5478145A
JPS5478145A JP14518377A JP14518377A JPS5478145A JP S5478145 A JPS5478145 A JP S5478145A JP 14518377 A JP14518377 A JP 14518377A JP 14518377 A JP14518377 A JP 14518377A JP S5478145 A JPS5478145 A JP S5478145A
Authority
JP
Japan
Prior art keywords
light
clad
guide
bent parts
formulas
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
JP14518377A
Other languages
Japanese (ja)
Other versions
JPS5647522B2 (en
Inventor
Taiji Murakami
Haruhiko Tsuchiya
Yoshinori Kato
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 JP14518377A priority Critical patent/JPS5478145A/en
Publication of JPS5478145A publication Critical patent/JPS5478145A/en
Publication of JPS5647522B2 publication Critical patent/JPS5647522B2/ja
Granted 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
    • G02B6/4289—Optical modules with tapping or launching means through the surface of the waveguide by inducing bending, microbending or macrobending, to the light guide
    • 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
    • G02B6/29335—Evanescent coupling to a resonator cavity, i.e. between a waveguide mode and a resonant mode of the cavity
    • G02B6/29338—Loop resonators
    • G02B6/29343—Cascade of loop resonators

Abstract

PURPOSE:To achieve the improvement in wavelength resolution by detecting the light being radiated from the bent parts of an optical guide with the photo detectors in the media of refractive indices different from that of the clad. CONSTITUTION:The light entering a single mode optical guide 1 is made to the guide light by the core 4 and the radiation light by the clad 8 of a refractive index lower than that of the core 4 at the bent parts of the optical guide 1. Coupling of both of the light becomes maximum when the conditions of the formulas I, II are satisfied, then the guide light is converted to the radiation light and the strong radiation light leaks into the covering of a refractive index lower than that of the clad 8. This leaking light is detected by the photo detectors 2a ... in the media 3a by way of the media 3a ... of refractive indices approximately the same as that of the clad 8 enclosing the outside of the bent parts 1a. Hence, if the bent parts 1a, 1b ... of different radii R are provided, the light may be branched at high resolution based on the formulas I, II. (In the formulas b; the half-amplitude level of clad, n2: the refractive index of the clad, beta: the phase constant of the guide mode, k: the number of waves of light in free space, N: integer.)
JP14518377A 1977-12-05 1977-12-05 Optical branching filter Granted JPS5478145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14518377A JPS5478145A (en) 1977-12-05 1977-12-05 Optical branching filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14518377A JPS5478145A (en) 1977-12-05 1977-12-05 Optical branching filter

Publications (2)

Publication Number Publication Date
JPS5478145A true JPS5478145A (en) 1979-06-22
JPS5647522B2 JPS5647522B2 (en) 1981-11-10

Family

ID=15379336

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14518377A Granted JPS5478145A (en) 1977-12-05 1977-12-05 Optical branching filter

Country Status (1)

Country Link
JP (1) JPS5478145A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972402A (en) * 1982-09-09 1984-04-24 ウエスタ−ン・エレクトリツク・カムパニ−・インコ−ポレ−テツド Apparatus and method of branching and outputting light ener-gy from optical fiber
JPS616609A (en) * 1984-06-20 1986-01-13 Sumitomo Electric Ind Ltd Method for entering light into optical fiber
JPS6114613A (en) * 1984-06-29 1986-01-22 Sumitomo Electric Ind Ltd Light incident device on optical fiber
JPS62113032A (en) * 1985-11-08 1987-05-23 トムソン―セーエスエフ Loop-shaped repulsion type interference device using single-mode optical fiber
JPH0617925B2 (en) * 1982-10-27 1994-03-09 レイケム・コーポレイション Fiber optic tap
JP2017181332A (en) * 2016-03-31 2017-10-05 株式会社Ｓｕｂａｒｕ Light observation system and light observation method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6348539A (en) * 1986-08-18 1988-03-01 Minolta Camera Co Ltd Lens interchangeable camera system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5171148A (en) * 1974-11-11 1976-06-19 Western Electric Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5171148A (en) * 1974-11-11 1976-06-19 Western Electric Co

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972402A (en) * 1982-09-09 1984-04-24 ウエスタ−ン・エレクトリツク・カムパニ−・インコ−ポレ−テツド Apparatus and method of branching and outputting light ener-gy from optical fiber
JPS6398509U (en) * 1982-09-09 1988-06-25
US4802723A (en) * 1982-09-09 1989-02-07 American Telephone And Telegraph Company, At&T Bell Laboratories Optical fiber tap
JPH0526562Y2 (en) * 1982-09-09 1993-07-06
JPH0617925B2 (en) * 1982-10-27 1994-03-09 レイケム・コーポレイション Fiber optic tap
JPS616609A (en) * 1984-06-20 1986-01-13 Sumitomo Electric Ind Ltd Method for entering light into optical fiber
JPS6114613A (en) * 1984-06-29 1986-01-22 Sumitomo Electric Ind Ltd Light incident device on optical fiber
JPS62113032A (en) * 1985-11-08 1987-05-23 トムソン―セーエスエフ Loop-shaped repulsion type interference device using single-mode optical fiber
JP2017181332A (en) * 2016-03-31 2017-10-05 株式会社Ｓｕｂａｒｕ Light observation system and light observation method

Also Published As

Publication number Publication date
JPS5647522B2 (en) 1981-11-10

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