JPS6461724A - Optical isolator - Google Patents

Optical isolator

Info

Publication number
JPS6461724A
JPS6461724A JP21942987A JP21942987A JPS6461724A JP S6461724 A JPS6461724 A JP S6461724A JP 21942987 A JP21942987 A JP 21942987A JP 21942987 A JP21942987 A JP 21942987A JP S6461724 A JPS6461724 A JP S6461724A
Authority
JP
Japan
Prior art keywords
light
polarization
polarized light
linear polarized
transmitted
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
JP21942987A
Other languages
Japanese (ja)
Inventor
Hiroshi Honmo
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP21942987A priority Critical patent/JPS6461724A/en
Publication of JPS6461724A publication Critical patent/JPS6461724A/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

Landscapes

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

Abstract

PURPOSE:To cut off return light and to facilitate integration by providing a polarizing filter which transmits only linear polarized light and a polarization control means which converts return light from an output terminal into linear polarized light in an orthogonal direction on an optical path which connected an input terminal and the output terminal mutually. CONSTITUTION:The linear polarized light emitted by a semiconductor laser 10 is propagated in an optical waveguide 2, transmitted through the polarizing filter, and incident on an optical fiber 11 through the polarization control element. The light is reflected repeatedly in the optical fiber 11 to become the elliptic polarized light, which returns to the phase shifter 7 of the polarization control element 8 and passes through the phase shifter 7 and a mode converter 6; and only a linear polarized light component having the same plane of polarization with the projection light of the semiconductor laser is transmitted and a liner polarized component which has a plane of polarization perpendicular to it is cut off. Part of the reflected light component transmitted through the polarizing filter 4 is branched to an optical waveguide 2' to become monitor light for control. A control circuit 15 applies a control voltage to the polarization control element so as to converge the intensity of this monitor light to zero, thereby cutting off the return light.
JP21942987A 1987-09-01 1987-09-01 Optical isolator Pending JPS6461724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21942987A JPS6461724A (en) 1987-09-01 1987-09-01 Optical isolator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21942987A JPS6461724A (en) 1987-09-01 1987-09-01 Optical isolator

Publications (1)

Publication Number Publication Date
JPS6461724A true JPS6461724A (en) 1989-03-08

Family

ID=16735258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21942987A Pending JPS6461724A (en) 1987-09-01 1987-09-01 Optical isolator

Country Status (1)

Country Link
JP (1) JPS6461724A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0907050A1 (en) * 1997-10-03 1999-04-07 THOMSON multimedia Back-lighting system for a transmissive electrooptic modulator using the light polarization effect
CN102937753A (en) * 2011-08-16 2013-02-20 深圳新飞通光电子技术有限公司 Optical isolator and optical assembly comprising same
US20130265399A1 (en) * 2012-04-10 2013-10-10 California Institute Of Technology Robotic adaptive optics and laser systems and methods for correcting atmospheric distortion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0907050A1 (en) * 1997-10-03 1999-04-07 THOMSON multimedia Back-lighting system for a transmissive electrooptic modulator using the light polarization effect
FR2769382A1 (en) * 1997-10-03 1999-04-09 Thomson Multimedia Sa REAR LIGHTING SYSTEM FOR A TRANSMISSIBLE ELECTRO-OPTICAL MODULATOR USING THE LIGHT POLARIZATION EFFECT
CN102937753A (en) * 2011-08-16 2013-02-20 深圳新飞通光电子技术有限公司 Optical isolator and optical assembly comprising same
US20130265399A1 (en) * 2012-04-10 2013-10-10 California Institute Of Technology Robotic adaptive optics and laser systems and methods for correcting atmospheric distortion
US9405115B2 (en) 2012-04-10 2016-08-02 California Institute Of Technology Laser beam guidance systems and methods
US9563053B2 (en) 2012-04-10 2017-02-07 California Institute Of Technology Systems and methods for modularized control of robotic adaptive optics and laser systems

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