JPS6490412A - Optical isolator - Google Patents

Optical isolator

Info

Publication number
JPS6490412A
JPS6490412A JP24869387A JP24869387A JPS6490412A JP S6490412 A JPS6490412 A JP S6490412A JP 24869387 A JP24869387 A JP 24869387A JP 24869387 A JP24869387 A JP 24869387A JP S6490412 A JPS6490412 A JP S6490412A
Authority
JP
Japan
Prior art keywords
ring
thin film
light beam
film crystal
polarization
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
JP24869387A
Other languages
Japanese (ja)
Inventor
Masaaki Tojo
Seiji Onaka
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP24869387A priority Critical patent/JPS6490412A/en
Publication of JPS6490412A publication Critical patent/JPS6490412A/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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
    • G02B6/4208—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback using non-reciprocal elements or birefringent plates, i.e. quasi-isolators
    • G02B6/4209—Optical features

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

PURPOSE:To obtain an optical isolator being suitable for miniaturization by providing a superconductive film in a shape of a ring on a YIG thin film crystal, allowing a current to flow to this ring and generating a magnetic field. CONSTITUTION:On yttrium iron garnet (YIG) thin film crystal 1, a superconductive substance is formed in a shape of a ring by sputtering, etc., and by allowing a large superconductive current 7 to flow to its ring 2, a large magnetic field 8 is generated. Accordingly, when a light beam is made incident in the same direction as the magnetic field 8, a plane of polarization of the light beam rotates. An optical isolator which has been constituted in such a way can be thinned extremely. A light beam which has been emitted from a semiconductor laser 4 transmits through the YIG thin film crystal 1 through a rod lens 3, transmits through an analyzer 5 and made incident on an optical fiber 6. It is return light beam passes through the YIG thin film crystal 1 two times, therefore, the plane of polarization of the return light and the plane of polarization of the emitted light are orthogonal to each other and do not interfere with each other. Accordingly, the semiconductor laser 4 executes a stable light emission.
JP24869387A 1987-10-01 1987-10-01 Optical isolator Pending JPS6490412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24869387A JPS6490412A (en) 1987-10-01 1987-10-01 Optical isolator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24869387A JPS6490412A (en) 1987-10-01 1987-10-01 Optical isolator

Publications (1)

Publication Number Publication Date
JPS6490412A true JPS6490412A (en) 1989-04-06

Family

ID=17181929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24869387A Pending JPS6490412A (en) 1987-10-01 1987-10-01 Optical isolator

Country Status (1)

Country Link
JP (1) JPS6490412A (en)

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