WO1998011463A3 - Optical fibre device - Google Patents

Optical fibre device Download PDF

Info

Publication number
WO1998011463A3
WO1998011463A3 PCT/GB1997/002449 GB9702449W WO9811463A3 WO 1998011463 A3 WO1998011463 A3 WO 1998011463A3 GB 9702449 W GB9702449 W GB 9702449W WO 9811463 A3 WO9811463 A3 WO 9811463A3
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic
filter
polarisation
responses
response
Prior art date
Application number
PCT/GB1997/002449
Other languages
French (fr)
Other versions
WO1998011463A2 (en
Inventor
Richard Ian Laming
D J Richardson
David Culverhouse
Seok Hyun Yun
Selina G Farwell
Michael Nickoloas Zervas
Timothy Adam Birks
Original Assignee
Univ Southampton
Richard Ian Laming
D J Richardson
David Culverhouse
Seok Hyun Yun
Selina G Farwell
Michael Nickoloas Zervas
Timothy Adam Birks
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 Univ Southampton, Richard Ian Laming, D J Richardson, David Culverhouse, Seok Hyun Yun, Selina G Farwell, Michael Nickoloas Zervas, Timothy Adam Birks filed Critical Univ Southampton
Priority to EP97939091A priority Critical patent/EP0925522A2/en
Priority to AU41310/97A priority patent/AU4131097A/en
Publication of WO1998011463A2 publication Critical patent/WO1998011463A2/en
Publication of WO1998011463A3 publication Critical patent/WO1998011463A3/en

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 
    • G02F1/0128—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 electro-mechanical, magneto-mechanical, elasto-optic effects
    • G02F1/0131—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 electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
    • G02F1/0134—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 electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence in optical waveguides
    • 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
    • G02F1/29—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 position or the direction of light beams, i.e. deflection
    • G02F1/31—Digital deflection, i.e. optical switching
    • G02F1/313—Digital deflection, i.e. optical switching in an optical waveguide structure
    • G02F1/3131—Digital deflection, i.e. optical switching in an optical waveguide structure in optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

An optical fibre device comprises an optical fibre null coupler (10) formed of two or more optical fibres (20, 30) fused together at a coupling region, at least a part of the coupling region being mechanically twisted substantially about a longitudinal axis of the coupling region. The twisting can alleviate the polarisation dependance observed in untwisted null coupler devices. In other embodiments of the invention, substantially polarization-insensitive operation of a null coupler acousto-optic tunable filter is obtained by simultaneously applying two acoustic waves.The two waves provide phase-matched coupling for each of the individual eigen-polarization states. The polarization dependence of the device to excitation at one of the acoustic frequencies leads to two different filter responses, one corresponding to each polarisation. One of these two responses will be at higher optical wavelength than the other, and if a particular input polarisation gives rise to, say, the higher optical wavelength filter response of the pair at a particular acoustic frequency it will do so at other acoustic frequencies. So, if two acoustic frequencies are applied, the acoustic frequencies can be selected so that the higher wavelength response of the two filter responses from one acoustic frequency overlies in optical wavelength the lower wavelength response of the two filter responses from the other acoustic frequency, then the combination of the two overlying filter responses (which relate to the two different input polarisations) provides a substantially polarisation independent filter response.
PCT/GB1997/002449 1996-09-10 1997-09-10 Optical fibre device WO1998011463A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97939091A EP0925522A2 (en) 1996-09-10 1997-09-10 Optical fibre device
AU41310/97A AU4131097A (en) 1996-09-10 1997-09-10 Optical fibre device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9618860A GB2317236A (en) 1996-09-10 1996-09-10 Optical fibre device
GB9618860.2 1996-09-10

Publications (2)

Publication Number Publication Date
WO1998011463A2 WO1998011463A2 (en) 1998-03-19
WO1998011463A3 true WO1998011463A3 (en) 1998-04-30

Family

ID=10799687

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002449 WO1998011463A2 (en) 1996-09-10 1997-09-10 Optical fibre device

Country Status (4)

Country Link
EP (1) EP0925522A2 (en)
AU (1) AU4131097A (en)
GB (1) GB2317236A (en)
WO (1) WO1998011463A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6370167B1 (en) 1998-09-29 2002-04-09 Corning O.T.I. S.P.A. Double-passage acousto-optical device and laser

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265233A1 (en) * 1986-10-20 1988-04-27 BRITISH TELECOMMUNICATIONS public limited company Non-linear optical device
WO1989012243A1 (en) * 1988-06-09 1989-12-14 University Of Southampton Fibre-optic couplers
WO1995022783A1 (en) * 1994-02-18 1995-08-24 University Of Southampton Optical device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187858B (en) * 1986-03-12 1989-11-15 Stc Plc Electronically controllable variable optical power ratio single mode fibre branching element
GB2220079B (en) * 1988-06-21 1992-08-12 Stc Plc Optically controlled optical power divider
GB2278206B (en) * 1993-05-19 1996-04-03 Northern Telecom Ltd Polarisation insensitive wavelength multiplexing 2®2 fibre couplers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265233A1 (en) * 1986-10-20 1988-04-27 BRITISH TELECOMMUNICATIONS public limited company Non-linear optical device
WO1989012243A1 (en) * 1988-06-09 1989-12-14 University Of Southampton Fibre-optic couplers
WO1995022783A1 (en) * 1994-02-18 1995-08-24 University Of Southampton Optical device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BARLOW A J ET AL: "BIREFRINGENCE AND POLARIZATION MODE-DISPERSION IN SPUN SINGLE-MODE FIBERS", APPLIED OPTICS, vol. 20, no. 17, 1 September 1981 (1981-09-01), pages 2962 - 2968, XP000676216 *
HYUM YUN S ET AL: "ALL-FIBER ACOUSTOOPTIC FILTER WITH LOW-POLARIZATION SENSITIVITY AND NO FREQUENCY SHIFT", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 9, no. 4, April 1997 (1997-04-01), pages 461 - 463, XP000690464 *
TONY E S ET AL: "A DIRECTIONAL COUPLER ACOUSTOOPTIC FILTER WITH REDUCED SIDELOBE LEVELS", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 12, no. 7, 1 July 1994 (1994-07-01), pages 1144 - 1151, XP000540001 *

Also Published As

Publication number Publication date
GB9618860D0 (en) 1996-10-23
EP0925522A2 (en) 1999-06-30
GB2317236A (en) 1998-03-18
AU4131097A (en) 1998-04-02
WO1998011463A2 (en) 1998-03-19

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