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DE19727125A1 - Fabry-Perot resonator in optical waveguide for narrowband filter without reflection - Google Patents

Fabry-Perot resonator in optical waveguide for narrowband filter without reflection

Info

Publication number
DE19727125A1
DE19727125A1 DE1997127125 DE19727125A DE19727125A1 DE 19727125 A1 DE19727125 A1 DE 19727125A1 DE 1997127125 DE1997127125 DE 1997127125 DE 19727125 A DE19727125 A DE 19727125A DE 19727125 A1 DE19727125 A1 DE 19727125A1
Authority
DE
Germany
Prior art keywords
mode
waveguide
optical waveguide
converter
reflection
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.)
Withdrawn
Application number
DE1997127125
Other languages
German (de)
Inventor
Dietmar Johlen
Ernst Prof Dr Brinkmeyer
Peter Klose
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.)
Johlen Dietmar 81541 Muenchen De Klose Peter
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE1997127125 priority Critical patent/DE19727125A1/en
Publication of DE19727125A1 publication Critical patent/DE19727125A1/en
Withdrawn legal-status Critical Current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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29323—Coupling to or out of the diffractive element through the lateral surface of the light guide
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/14—Mode converters
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29356—Interference cavity within a single light guide, e.g. between two fibre gratings
    • 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 
    • G02F1/011—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  in optical waveguides, not otherwise provided for in this subclass
    • 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 
    • G02F1/21—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  by interference
    • G02F1/225—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  by interference in an optical waveguide structure
    • 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 
    • G02F1/011—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  in optical waveguides, not otherwise provided for in this subclass
    • G02F1/0115—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  in optical waveguides, not otherwise provided for in this subclass in optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

The resonator consists of two mode converters in an optical waveguide. Light is coupled in a counter-propagating manner from a mode in which it is fed into the waveguide, into different mode in which it is fed only into a processed part of the resonator, a mode which is not capable of propagating in the rest of the waveguide outside the converters. The resonator has no or negligible reflection, for which in resonance a narrowband transmission window is produced. The converters are asymmetrical Bragg gratings. The waveguides may be optical glass fibres or integrated optical waveguides.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung, bei der ein Resonator aus zwei Modenkonvertern in einem optischen Wellenleiter ein schmalbandiges Filter ohne oder vernachlässigbare Reflexion bildet.The present invention relates to a device in which a resonator consists of two Mode converters in an optical waveguide a narrow band filter without or forms negligible reflection.

Bisherige schmalbandige Filter, z. B. Faser Fabry-Perot Resonatoren, auf der Basis von Faser-Bragg Gittern haben den Nachteil, daß sie eine hohe Reflexion besitzen. Aufgrund dieses Verhaltens sind sie z. B. nicht in Lasern einsetzbar, um eine möglichst hohe spektrale Schmalbandigkeit zu erzielen.Previous narrowband filters, e.g. B. fiber Fabry-Perot resonators, based on fiber Bragg Grids have the disadvantage that they have a high reflection. Because of this Behavior, they are e.g. B. not usable in lasers to get the highest possible spectral To achieve narrow band.

Wünschenswert wäre ein schmalbandiger Verlust ohne Reflexion, in dem sich ein noch schmalbandigeres Transmissionsfenster öffnen läßt.It would be desirable to have a narrow-band loss without reflection, in which there is still one allows to open a narrow-band transmission window.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein optischer Wellenleiter auf einem Abschnitt derart behandelt wird, daß er dort mindestens eine oder mehrere zusätzliche Moden führen kann. Die Aufgabe des Modenkonverters besteht darin kontradirektional eine oder mehrere der außerhalb des behandelten Wellenleiters geführten Moden in eine oder mehrere der zusätzlich im behandelten Bereich des Wellenleiters geführten Moden überzukoppeln. Damit stellt der Modenkonverter in einem so vorbereiteten Wellenleiter einen Verlust dar, da das konvertierte, reflektierte Licht im unbehandelten Wellenleiter nicht geführt werden kann und abgestrahlt wird.This object is achieved in that an optical waveguide a section is treated in such a way that it contains at least one or more additional ones Can lead fashions. The task of the mode converter is contradirectionally one or more of the modes guided outside the treated waveguide into one or several of the additional modes in the treated area of the waveguide to couple over. The mode converter thus provides a waveguide prepared in this way Loss because the converted, reflected light is not guided in the untreated waveguide can be and is emitted.

Werden zwei Konverter in dem behandelten Stück des Wellenleiters realisiert, so entsteht ein Resonator. Abhängig von der Phasenlage zwischen den Konvertern kommt es zu einer Resonanz für eine Phase von π/2 mod π. Damit kann ein schmalbandiger Verlust mit einem weitaus schmalbandigerem Transmissionsfenster realisiert werden.If two converters are implemented in the treated piece of the waveguide, one is created Resonator. Depending on the phase position between the converters, one occurs Resonance for a phase of π / 2 mod π. A narrow-band loss with a transmission window that is much narrower.

Konkret erfüllt ein schräges Bragg-Gitter in einer monomodigen Glasfaser oder einem monomodigen integriert-optischen Wellenleiter, das den Wellenleiter im Bereich des Gitters aufgrund des im Gitterschreibprozeß induzierten Brechzahlhubes zweimodig oder noch höhermodig werden läßt, die Bedingungen an den zuvor geschilderten Konverter.Specifically, an oblique Bragg grating in a single-mode glass fiber or meets single-mode integrated optical waveguide, which is the waveguide in the area of the grating due to the refractive index stroke induced in the grating writing process, two-mode or still can be higher fashioned, the conditions of the converter described above.

Um die Resonatorkonfiguration zu realisieren, wird ein Stück des monomodigen, integriert- optischen Wellenleiters oder der optischen Faser durch UV-Belichtung zweimodig gemacht. Daraufhin werden in diesen Bereich zwei schräge Bragg-Gitter eingeschrieben. Der Grundmodus des optischen Wellenleiters wird hier mit Mode A und der höhere Modus im behandelten Wellenleiterbereich mit Modus B bezeichnet. Der Modenkonverter, bestehend aus einem schrägen Bragg-Gitter, konvertiert dabei Mode A zu Mode B und umgekehrt. Wie Fig. 1 zeigt, sind alle in vorwärts Richtung laufenden Wellen im Modus A und alle rückwärts laufenden Wellen im Modus B. Damit kann es zu keiner Reflexion durch diese Vorrichtung kommen, da Modus B außerhalb des behandelten Wellenleiters nicht ausbreitungsfähig ist und abgestrahlt wird. Entspricht die optische Weglänge zwischen den Konvertern einer Phase von π/2 mod π, so öffnet sich im Stopband des Fasergitters ein schmalbandiges Transmissionsfenster.To implement the resonator configuration, a piece of the single-mode, integrated optical waveguide or the optical fiber is made two-mode by UV exposure. Then two oblique Bragg gratings are inscribed in this area. The basic mode of the optical waveguide is referred to here as mode A and the higher mode in the treated waveguide area is referred to as mode B. The mode converter, consisting of an oblique Bragg grating, converts mode A to mode B and vice versa. As shown in FIG. 1, all waves traveling in the forward direction are in mode A and all waves traveling in reverse are in mode B. This means that there can be no reflection by this device, since mode B cannot be propagated outside the treated waveguide and is emitted. If the optical path length between the converters corresponds to a phase of π / 2 mod π, a narrow-band transmission window opens in the stop band of the fiber grating.

Eine Faserlaser kann durch diese Vorrichtung auf eine oder einige wenige longitudinale Moden beschränkt werden.A fiber laser can be directed to one or a few longitudinal ones by this device Fashions are limited.

Claims (8)

1. Vorrichtung aus einem Resonator, bestehend aus zwei Modenkonvertern, in einem optischen Wellenleiter dadurch gekennzeichnet, daß Licht kontradirektional von einer im Wellenleiter geführten Mode in eine andere nur im behandelten Teil der Vorrichtung geführten Mode, im übrigen Wellenleiter außerhalb der Konverter jedoch nicht ausbreitungsfähigen Mode gekoppelt wird, wodurch die Vorrichtung keine Reflexion oder nur zu vernachlässigende Reflexion aufweist und für die in Resonanz ein schmalbandiges Transmissionsfenster entsteht.1. Device from a resonator, consisting of two mode converters, in an optical waveguide, characterized in that light is counter-directional from one mode guided in the waveguide to another only in the treated part of the device, but in the rest of the waveguide outside the converter, however, mode not capable of propagation is coupled, whereby the device has no reflection or only negligible reflection and for which a narrow-band transmission window is created in resonance. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Konverter aus asymmetrischen Bragg Gittern bestehen.2. Device according to claim 1, characterized in that the converter asymmetrical Bragg grids. 3. Vorrichtung nach Anspruch 1 bis 2, dadurch gekennzeichnet, daß die Konverter aus schräg gestellten Bragg Gittern bestehen.3. Apparatus according to claim 1 to 2, characterized in that the converter from obliquely provided Bragg grids. 4. Vorrichtung nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß als Wellenleiter eine optische Glasfaser oder ein integriert-optischer Wellenleiter benutzt wird.4. Apparatus according to claim 1 to 3, characterized in that a waveguide optical fiber or an integrated optical waveguide is used. 5. Vorrichtung nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß der optische Wellenleiter durch Einfügen eines anderen Wellenleiters, der in diesem Bereich höhermodiges Licht im Sinne des Konverters führen kann, geeignet modifiziert werden kann.5. Apparatus according to claim 1 to 4, characterized in that the optical waveguide by inserting another waveguide, which in this area has higher-mode light in the Can lead the sense of the converter, can be modified appropriately. 6. Vorrichtung nach einem oder mehreren Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß der optische Wellenleiter abschnittsweise durch Belichtung mit UV-Licht oder anderem geeigneten Licht höhermodig im Sinne des Konverters wird.6. The device according to one or more claims 1 to 5, characterized in that the optical waveguide in sections by exposure to UV light or other suitable light becomes more fashionable in the sense of the converter. 7. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der optische Wellenleiter einmodig ist und abschnittsweise durch Belichtung mit UV-Licht oder anderem geeigneten Licht zweimodig wird.7. The device according to one or more of claims 1 to 6, characterized in that that the optical waveguide is single-mode and in sections by exposure to UV light or other suitable light becomes two-mode. 8. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß in dem Konverter ein Phasensprung durch optische, thermische, elektrische, magnetische oder mechanische Behandlung oder eine Kombination hiervon erzeugt wird.8. The device according to one or more of claims 1 to 7, characterized in that that in the converter a phase jump by optical, thermal, electrical, magnetic or mechanical treatment or a combination thereof.
DE1997127125 1997-06-26 1997-06-26 Fabry-Perot resonator in optical waveguide for narrowband filter without reflection Withdrawn DE19727125A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997127125 DE19727125A1 (en) 1997-06-26 1997-06-26 Fabry-Perot resonator in optical waveguide for narrowband filter without reflection

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1202089A1 (en) * 2000-10-31 2002-05-02 PIRELLI CAVI E SISTEMI S.p.A. Optical fibre filter
EP1489445A1 (en) * 2003-06-20 2004-12-22 Alcatel A non-reflective optical waveguide filter with a slanted Bragg grating
DE102009041891A1 (en) * 2009-09-18 2011-03-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Transverse mode filter for waveguides
CN109167131A (en) * 2018-08-02 2019-01-08 电子科技大学 A kind of rectangular wave inducing defecation by enema and suppository wave interference filter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1202089A1 (en) * 2000-10-31 2002-05-02 PIRELLI CAVI E SISTEMI S.p.A. Optical fibre filter
WO2002037150A1 (en) * 2000-10-31 2002-05-10 Pirelli S.P.A. Optical fibre filter
US7177511B2 (en) 2000-10-31 2007-02-13 Pirelli S.P.A. Optical fiber, optical fiber filter, and optical amplifier
EP1489445A1 (en) * 2003-06-20 2004-12-22 Alcatel A non-reflective optical waveguide filter with a slanted Bragg grating
FR2856482A1 (en) * 2003-06-20 2004-12-24 Cit Alcatel OPTICAL FILTER
US7095924B2 (en) 2003-06-20 2006-08-22 Alcatel Optical filter
DE102009041891A1 (en) * 2009-09-18 2011-03-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Transverse mode filter for waveguides
US8891917B2 (en) 2009-09-18 2014-11-18 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Transverse mode filter for waveguides
CN109167131A (en) * 2018-08-02 2019-01-08 电子科技大学 A kind of rectangular wave inducing defecation by enema and suppository wave interference filter
CN109167131B (en) * 2018-08-02 2020-03-27 电子科技大学 A Rectangular Waveguide Normal Wave Interference Filter

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: JOHLEN, DIETMAR, 81541 MUENCHEN, DE KLOSE, PETER,

8139 Disposal/non-payment of the annual fee