JPS5797510A - Optical branching filter - Google Patents

Optical branching filter

Info

Publication number
JPS5797510A
JPS5797510A JP17437980A JP17437980A JPS5797510A JP S5797510 A JPS5797510 A JP S5797510A JP 17437980 A JP17437980 A JP 17437980A JP 17437980 A JP17437980 A JP 17437980A JP S5797510 A JPS5797510 A JP S5797510A
Authority
JP
Japan
Prior art keywords
fiber
optical
coupling
fibers
end surface
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
JP17437980A
Other languages
Japanese (ja)
Inventor
Tadao Arima
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17437980A priority Critical patent/JPS5797510A/en
Publication of JPS5797510A publication Critical patent/JPS5797510A/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
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To improve the efficiency of coupling with optical fibers by branching light incident from an input terminal through the 1st fiber layer and also making it propagate as a plane wave, and by focusing it on an output end surface through the 2nd fiber layer. CONSTITUTION:An optical fiber rod F consists of fibers 1 and 2 which have different refractivity distribution shapes. The fiber 1 has refractivity distribution as a concentric parabola T. The fiber 2, on the other hand, has stepwise refractivity distribution. The said fiber 1 provides lens operation to focus transmitted light. At this time, the distance D between the focal points of the end surface of the fiber rod F at the output end side OUT is as shown by equationI, where the length of the fiber 1 is denoted as Z. For this purpose, the photodetection- side optical fiber is placed at the focal to perform optical coupling efficiently. Thus, the coupling efficiency of the optical fibers is improved.
JP17437980A 1980-12-10 1980-12-10 Optical branching filter Pending JPS5797510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17437980A JPS5797510A (en) 1980-12-10 1980-12-10 Optical branching filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17437980A JPS5797510A (en) 1980-12-10 1980-12-10 Optical branching filter

Publications (1)

Publication Number Publication Date
JPS5797510A true JPS5797510A (en) 1982-06-17

Family

ID=15977579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17437980A Pending JPS5797510A (en) 1980-12-10 1980-12-10 Optical branching filter

Country Status (1)

Country Link
JP (1) JPS5797510A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5457759A (en) * 1992-12-15 1995-10-10 France Telecom Monolithic optical system and method of making same including improved coupling means between an optical fiber and a phototransducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5457759A (en) * 1992-12-15 1995-10-10 France Telecom Monolithic optical system and method of making same including improved coupling means between an optical fiber and a phototransducer

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