JPS55138702A - Optical directional coupler - Google Patents

Optical directional coupler

Info

Publication number
JPS55138702A
JPS55138702A JP4672079A JP4672079A JPS55138702A JP S55138702 A JPS55138702 A JP S55138702A JP 4672079 A JP4672079 A JP 4672079A JP 4672079 A JP4672079 A JP 4672079A JP S55138702 A JPS55138702 A JP S55138702A
Authority
JP
Japan
Prior art keywords
light
fiber
calcite
optical path
entered
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
JP4672079A
Other languages
Japanese (ja)
Inventor
Ikutaro Kobayashi
Kenji Okada
Kenji Aoshima
Tomoyuki Ito
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.)
OUYOU KOUDEN KENKIYUUSHITSU KK
OYO KODEN KENKIYUUSHITSU KK
Nippon Telegraph and Telephone Corp
Original Assignee
OUYOU KOUDEN KENKIYUUSHITSU KK
OYO KODEN KENKIYUUSHITSU KK
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 OUYOU KOUDEN KENKIYUUSHITSU KK, OYO KODEN KENKIYUUSHITSU KK, Nippon Telegraph and Telephone Corp filed Critical OUYOU KOUDEN KENKIYUUSHITSU KK
Priority to JP4672079A priority Critical patent/JPS55138702A/en
Publication of JPS55138702A publication Critical patent/JPS55138702A/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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2773—Polarisation splitting or combining

Landscapes

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

Abstract

PURPOSE:To eliminate the coupling of unnecessary light and make possible the measurement of weak light by making use of the crystal which has double refractive action. CONSTITUTION:Light from a fiber 2 is collimated by a lens 4 and enters calcite 9 and if the axial direction of the calcite 9 is beforehand suitably selected, the light is divided to two optical paths 10, 11 by its double refraction. The respective lights are entered to fibers 1, 3 by lenses 5, 6. Similarly, part of the light from the fiber 3 advances to the fiber 1. The double refraction phenomenon depends upon the plane of polarization of light. When the light of the optical path 13 incident from the point 17 causes the end face reflection of the calcite 9 at the point 19, this reflected light has the polarization perpendicular to the plane of the paper and therefore the light fully returns in the optical path 13 and does not advance to the optical path 14. Hence, when the device is constituted by using calcite, the coupling from the fiber 1-3 or from the fiber 3-1 does not occur. In this way, the powerful light is entered from the fiber 1-2 and at the same time the weak light from the fiber 2 may be observed at the output end of the fiber 3 without being hampered by the reflection of this light.
JP4672079A 1979-04-18 1979-04-18 Optical directional coupler Pending JPS55138702A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4672079A JPS55138702A (en) 1979-04-18 1979-04-18 Optical directional coupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4672079A JPS55138702A (en) 1979-04-18 1979-04-18 Optical directional coupler

Publications (1)

Publication Number Publication Date
JPS55138702A true JPS55138702A (en) 1980-10-29

Family

ID=12755169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4672079A Pending JPS55138702A (en) 1979-04-18 1979-04-18 Optical directional coupler

Country Status (1)

Country Link
JP (1) JPS55138702A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014254A (en) * 1997-02-24 2000-01-11 Cheng; Yihao Optical device for splitting an input beam into two orthogonal polarization states

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4936963B1 (en) * 1969-06-06 1974-10-04
JPS5350754A (en) * 1976-10-18 1978-05-09 Nec Corp Multiplexed light separating circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4936963B1 (en) * 1969-06-06 1974-10-04
JPS5350754A (en) * 1976-10-18 1978-05-09 Nec Corp Multiplexed light separating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014254A (en) * 1997-02-24 2000-01-11 Cheng; Yihao Optical device for splitting an input beam into two orthogonal polarization states

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