JPS6420521A - Optical isolator - Google Patents

Optical isolator

Info

Publication number
JPS6420521A
JPS6420521A JP17669487A JP17669487A JPS6420521A JP S6420521 A JPS6420521 A JP S6420521A JP 17669487 A JP17669487 A JP 17669487A JP 17669487 A JP17669487 A JP 17669487A JP S6420521 A JPS6420521 A JP S6420521A
Authority
JP
Japan
Prior art keywords
isolator
optical
becomes maximum
central wavelength
isolators
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
JP17669487A
Other languages
Japanese (ja)
Inventor
Shigeru Takeda
Satoshi Makio
Hiroyoshi Matsumura
Naoki Kayane
Shinji Sakano
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.)
Hitachi Ltd
Proterial Ltd
Original Assignee
Hitachi Ltd
Hitachi Metals 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 Hitachi Ltd, Hitachi Metals Ltd filed Critical Hitachi Ltd
Priority to JP17669487A priority Critical patent/JPS6420521A/en
Publication of JPS6420521A publication Critical patent/JPS6420521A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

PURPOSE:To use a device in high backward loss and low insertion loss, by setting a central wavelength where the backward loss of an optical isolator on one side of two optical isolators becomes maximum at 1.3+ or -0.1mum, and the central wavelength where that of the optical isolator on the other side becomes maximum at 1.55+ or -0.1mum. CONSTITUTION:The titled isolator is two-linked optical isolators 4 and 5 consisting of a Faraday rotor FR arranged in the center of hollow magnets 3a and 3b magnetized in the advancing direction of light, polarizers P1 and P2 and optical detectors P2 and P3 arranged at both sides of the rotor FR. In the isolators 4 and 5, the central wavelength where the backward loss becomes maximum of the isolator on one side is set at 1.3+ or -0.1mum, and the central wavelength where the backward loss becomes maximum of the isolator on the other side is set at 1.55+ or -0.1mum, and different length are given on two Faraday rotors FR1 and FR2 connoted in two-linked optical isolators 4 and 5. Thereby, it is possible to obtain the optical isolator replying to a wavelength multiplex communication system which satisfies both wavelength bands, a 1.3mum band and a 1.55mum band, simultaneously.
JP17669487A 1987-07-15 1987-07-15 Optical isolator Pending JPS6420521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17669487A JPS6420521A (en) 1987-07-15 1987-07-15 Optical isolator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17669487A JPS6420521A (en) 1987-07-15 1987-07-15 Optical isolator

Publications (1)

Publication Number Publication Date
JPS6420521A true JPS6420521A (en) 1989-01-24

Family

ID=16018103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17669487A Pending JPS6420521A (en) 1987-07-15 1987-07-15 Optical isolator

Country Status (1)

Country Link
JP (1) JPS6420521A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0547911U (en) * 1991-11-30 1993-06-25 富士電気化学株式会社 Polarization independent optical isolator
US5375009A (en) * 1991-04-26 1994-12-20 Hoya Corporation Optical isolator device having a wider cutoff wavelength band for a return light beam
US5446578A (en) * 1988-07-21 1995-08-29 Hewlett-Packard Company Polarization preserving optical isolator
WO2002014939A1 (en) * 2000-08-11 2002-02-21 Fdk Corporation Farady rotation device and optical device comprising it
JP2013041882A (en) * 2011-08-11 2013-02-28 Fujitsu Ltd Optical amplifier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446578A (en) * 1988-07-21 1995-08-29 Hewlett-Packard Company Polarization preserving optical isolator
US5375009A (en) * 1991-04-26 1994-12-20 Hoya Corporation Optical isolator device having a wider cutoff wavelength band for a return light beam
JPH0547911U (en) * 1991-11-30 1993-06-25 富士電気化学株式会社 Polarization independent optical isolator
WO2002014939A1 (en) * 2000-08-11 2002-02-21 Fdk Corporation Farady rotation device and optical device comprising it
US6876480B2 (en) 2000-08-11 2005-04-05 Fdk Corporation Farady rotation device and optical device comprising it
US7006273B2 (en) 2000-08-11 2006-02-28 Fdk Corporation Faraday rotation device and optical device using same
JP2013041882A (en) * 2011-08-11 2013-02-28 Fujitsu Ltd Optical amplifier

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