JPS5478144A - Optical filter - Google Patents

Optical filter

Info

Publication number
JPS5478144A
JPS5478144A JP14518277A JP14518277A JPS5478144A JP S5478144 A JPS5478144 A JP S5478144A JP 14518277 A JP14518277 A JP 14518277A JP 14518277 A JP14518277 A JP 14518277A JP S5478144 A JPS5478144 A JP S5478144A
Authority
JP
Japan
Prior art keywords
light
guide
curvature
radiation
radiation light
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
JP14518277A
Other languages
Japanese (ja)
Other versions
JPS5647521B2 (en
Inventor
Taiji Murakami
Haruhiko Tsuchiya
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.)
NTT Inc
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 JP14518277A priority Critical patent/JPS5478144A/en
Publication of JPS5478144A publication Critical patent/JPS5478144A/en
Publication of JPS5647521B2 publication Critical patent/JPS5647521B2/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
    • G02B6/26—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To eliminate the need for optical axis adjustment and provide a small filter of sharp rise by making use of the optical loss of a single mode waveguide of different radii of curvature or multiple waveguides of the same radius of curvature. CONSTITUTION:The incident light to a single mode optical guide 1 with an external layer is bisected to the guide light by the core part 4 and the radiation light reflecting at the boundary 6 with the external layer of the clad 5 of a refractive index n2 smaller than that of the core part 4 and a half-amplitude level (b) by the bent parts whose radii of curvature R1 thru R3 become subsequently smaller. When the conditions of the formulas I, II wherein the phase difference of the radiation light and guide mode becomes N(integer) times of 2pi are satisfied, coupling of the radiation light and guide light becomes maximum and the guide light is converted to the radiation light, which is then radiated to the outside from the reflection point of the boundary 6, thus the light loss of the guide light becomes large. (In the formulas beta : the phase constant of the guide mode, K : the number of light waves of free space)
JP14518277A 1977-12-05 1977-12-05 Optical filter Granted JPS5478144A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14518277A JPS5478144A (en) 1977-12-05 1977-12-05 Optical filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14518277A JPS5478144A (en) 1977-12-05 1977-12-05 Optical filter

Publications (2)

Publication Number Publication Date
JPS5478144A true JPS5478144A (en) 1979-06-22
JPS5647521B2 JPS5647521B2 (en) 1981-11-10

Family

ID=15379314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14518277A Granted JPS5478144A (en) 1977-12-05 1977-12-05 Optical filter

Country Status (1)

Country Link
JP (1) JPS5478144A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031832A (en) * 1973-04-18 1975-03-28
JPS5171148A (en) * 1974-11-11 1976-06-19 Western Electric Co

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031832A (en) * 1973-04-18 1975-03-28
JPS5171148A (en) * 1974-11-11 1976-06-19 Western Electric Co

Also Published As

Publication number Publication date
JPS5647521B2 (en) 1981-11-10

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