JPS54157632A - Attenuator for optical fibers - Google Patents

Attenuator for optical fibers

Info

Publication number
JPS54157632A
JPS54157632A JP6488778A JP6488778A JPS54157632A JP S54157632 A JPS54157632 A JP S54157632A JP 6488778 A JP6488778 A JP 6488778A JP 6488778 A JP6488778 A JP 6488778A JP S54157632 A JPS54157632 A JP S54157632A
Authority
JP
Japan
Prior art keywords
focusing type
lens
cylindrical lens
type cylindrical
attenuator
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
JP6488778A
Other languages
Japanese (ja)
Inventor
Kunio Hashimoto
Koichi Asatani
Kiyoshi Nosu
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 JP6488778A priority Critical patent/JPS54157632A/en
Publication of JPS54157632A publication Critical patent/JPS54157632A/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
    • G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
    • G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To enable axial alignment of optical fibers to be readily accomplished without degrading their transmission characteristics by inserting a focusing type cylindrical lens at the butt portions of the fibers and inserting an absorption elements giving attenuation in the lens. CONSTITUTION:When a conventional attenuator constituted by optical fibers alone and an attenuator inserted with a focusing type cylindrical lens having a lens of 1/2 pitch are compared, the accuracy of axial alignment is determined by the area ratio R of the ray propagation region expressed by formula I. If, for example, the length of the focusing type lens of 1/2 pitch is let 20 mm, the refractive index nf1 of core 1.46 by taking an example of a quartz fiber 1% and the core radius a 60mum, then the maximum axial deviation quantity rt of the focusing type cylindrical lens is 1.86 mm and its area ratio R is 961. Hence, the axial alignment of the attenuator inserted with the foregoing focusing type cylindrical lens becomes extremely easy and further there is no degradation of transmission characteristics such as the occurrence of mode conversion or other.
JP6488778A 1978-06-01 1978-06-01 Attenuator for optical fibers Pending JPS54157632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6488778A JPS54157632A (en) 1978-06-01 1978-06-01 Attenuator for optical fibers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6488778A JPS54157632A (en) 1978-06-01 1978-06-01 Attenuator for optical fibers

Publications (1)

Publication Number Publication Date
JPS54157632A true JPS54157632A (en) 1979-12-12

Family

ID=13271048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6488778A Pending JPS54157632A (en) 1978-06-01 1978-06-01 Attenuator for optical fibers

Country Status (1)

Country Link
JP (1) JPS54157632A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731642U (en) * 1980-07-31 1982-02-19

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133565U (en) * 1974-09-02 1976-03-12
JPS5185729A (en) * 1975-01-25 1976-07-27 Fujitsu Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133565U (en) * 1974-09-02 1976-03-12
JPS5185729A (en) * 1975-01-25 1976-07-27 Fujitsu Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731642U (en) * 1980-07-31 1982-02-19

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