JPS57111512A - Coupling device of semiconductor laser to optical fiber - Google Patents

Coupling device of semiconductor laser to optical fiber

Info

Publication number
JPS57111512A
JPS57111512A JP18829980A JP18829980A JPS57111512A JP S57111512 A JPS57111512 A JP S57111512A JP 18829980 A JP18829980 A JP 18829980A JP 18829980 A JP18829980 A JP 18829980A JP S57111512 A JPS57111512 A JP S57111512A
Authority
JP
Japan
Prior art keywords
optical fiber
semiconductor laser
varied
deltanz
optical
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
JP18829980A
Other languages
Japanese (ja)
Inventor
Teruhito Matsui
Masahiro Nunoshita
Yoshitoku Nomura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP18829980A priority Critical patent/JPS57111512A/en
Publication of JPS57111512A publication Critical patent/JPS57111512A/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 
    • G02F1/03—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To reduce a speckle noise in optical communication, by utilizing a Pockels effect by use of an electric and optical crystal, and varying the interference condition in an optical fiber. CONSTITUTION:Between a semiconductor laser 1 and a coupling lens 3, and an optical fiber 7, an LiNbO3 transparent electro-optical crystal 4[length (d)] whose C axis is in parallel with a junction surface 2 to the semiconductor laser 1 is installed, voltage from a high frequency voltage applying circuit 6 is applied to an electrode 5, and when an electric field EZ is applied in the Z axis direction, the refractive index is varied by a Pockels effect. For instance, when a varied portion of the refractive index in the (z) direction is denoted as DELTAnz, since a light beam of the semiconductor laser is generally oscillated in TE mode being in parallel with the junction surface, it is influenced by DELTAnz, therefore, when (d) is selected so as to be DELTAnz.d=lambda/2, phase of the light beam in an incident and 8 of the optical fiber 7 is varied by pi. In this way, the interference condition in the optical fiber is varied, and the speckle is smoothed.
JP18829980A 1980-12-27 1980-12-27 Coupling device of semiconductor laser to optical fiber Pending JPS57111512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18829980A JPS57111512A (en) 1980-12-27 1980-12-27 Coupling device of semiconductor laser to optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18829980A JPS57111512A (en) 1980-12-27 1980-12-27 Coupling device of semiconductor laser to optical fiber

Publications (1)

Publication Number Publication Date
JPS57111512A true JPS57111512A (en) 1982-07-12

Family

ID=16221180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18829980A Pending JPS57111512A (en) 1980-12-27 1980-12-27 Coupling device of semiconductor laser to optical fiber

Country Status (1)

Country Link
JP (1) JPS57111512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6395406A (en) * 1986-10-11 1988-04-26 Nippon Sheet Glass Co Ltd Distributed index type optical element
EP1283434A3 (en) * 2001-08-08 2003-10-29 Eastman Kodak Company Electro-optic despeckling modulator and method of use
KR100795115B1 (en) 2006-03-31 2008-01-17 엘지전자 주식회사 Optical System for Widening Scope and Device for Inspecting a Foreign Substance using the Same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6395406A (en) * 1986-10-11 1988-04-26 Nippon Sheet Glass Co Ltd Distributed index type optical element
EP1283434A3 (en) * 2001-08-08 2003-10-29 Eastman Kodak Company Electro-optic despeckling modulator and method of use
US6791739B2 (en) 2001-08-08 2004-09-14 Eastman Kodak Company Electro-optic despeckling modulator and method of use
KR100795115B1 (en) 2006-03-31 2008-01-17 엘지전자 주식회사 Optical System for Widening Scope and Device for Inspecting a Foreign Substance using the Same

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