WO2003014822A2 - Systeme optique - Google Patents

Systeme optique Download PDF

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Publication number
WO2003014822A2
WO2003014822A2 PCT/GB2002/003481 GB0203481W WO03014822A2 WO 2003014822 A2 WO2003014822 A2 WO 2003014822A2 GB 0203481 W GB0203481 W GB 0203481W WO 03014822 A2 WO03014822 A2 WO 03014822A2
Authority
WO
WIPO (PCT)
Prior art keywords
attenuating elements
paths
optical
output
output paths
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.)
Ceased
Application number
PCT/GB2002/003481
Other languages
English (en)
Other versions
WO2003014822A3 (fr
Inventor
Adrian Petru Vonsovici
Ian Day
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.)
Lumentum Technology UK Ltd
Original Assignee
Bookham Technology PLC
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 Bookham Technology PLC filed Critical Bookham Technology PLC
Priority to AU2002317400A priority Critical patent/AU2002317400A1/en
Publication of WO2003014822A2 publication Critical patent/WO2003014822A2/fr
Anticipated expiration legal-status Critical
Publication of WO2003014822A3 publication Critical patent/WO2003014822A3/fr
Ceased 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
    • G02F1/29—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
    • 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 
    • G02F1/015—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/0155—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction modulating the optical absorption
    • 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
    • G02F1/3136—Digital deflection, i.e. optical switching in an optical waveguide structure of interferometric switch type
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/48—Variable attenuator

Definitions

  • the present invention relates to an optic system, in particular to an optic system including an electrically controllable photonic circuit element for receiving an optical signal from at least one optical path and selectively directing the optical signal to a selected one or more of a plurality of output paths.
  • interferometric-type switching elements tend to suffer from the problem that a small residual portion of the input signal enters output paths other than that or those to which it is desired to direct the input signal.
  • the degree to which this occurs is referred to as the cross-talk performance of the system.
  • this could be avoided using splitters and combiners that are precisely balanced in power in such a way that the correct phase difference is achieved between different optical paths.
  • this perfect balance of powers can be difficult to achieve in practice and is also very sensitive to fabrication errors.
  • non-interferometric type switches such as digital optical switches, in that refractive index differences between the two output arms are limited by the electro-optical effect used.
  • an optic system including: an integrated optical device including an electrically controllable photonic circuit element for receiving an optical signal from at least one optical path and selectively directing the optical signal to a selected one or more of a plurality of optical output paths, and being electrically adjustable between a plurality of states at which the input optical signal is selectively directed to a different output path or combination of output paths; electrically controllable attenuating elements associated with each of the output paths; and electrical circuitry for controlling the attenuating elements in coordination with the photonic circuit element such that the attenuating elements associated with the one or more selected paths are in an on state, and the attenuating elements associated with output paths other than the selected paths are in an off state to substantially extinguish any signal power in those output paths.
  • an optic system includes a silicon-on-insulator (SOI) chip 2 having defined therein an electrically controllable photonic circuit 4 for selectively directing an optical signal from input waveguide 6 to a selected one of three output waveguides 8.
  • SOI silicon-on-insulator
  • Each output waveguide 8 is provided with an in-line attenuating element 8, which can be switched from an "on” state in which it applies a zero or low degree of attenuation, and an "off state in which it applies a high degree of attenuation.
  • the photonic circuit 4 may, for example, be an interferometric type switch such as a Mach-Zehnder switch or a non-interferometric-type switch such as digital optical switch.
  • the desired output path is selected by controlling an electric signal to the switch.
  • the in-line attenuating element may for example be a pin diode attenuating element 6 that includes n-doped and p-doped regions on either side of the waveguide 8, such that charge carriers can be injected into the waveguide upon application of an appropriate voltage across the n-doped and p-doped regions.
  • the injection of charge carriers into the waveguide increases the absorption of the waveguide with respect to the optical signal and thus increases the attenuation of the optical signal.
  • the attenuating element can be switched between the on and off states by controlling the voltage applied across the n- doped and p-doped regions.
  • the pin diode attenuating element 6 may have a structure as described in co-pending UK patent applications no. GB0019971.5 or GBO 104384.3, whose contents are incorporated herein by reference. Alternatively, other types of in-line attenuating elements that operate by absorption effects could be used.
  • a processor 12 controls both the photonic circuit and the attenuating elements in co-ordination with each other in accordance with a command specifying the output waveguide to which the input signal should be directed, such that only that attenuating element associated with the selected output waveguide is maintained in an "on” state to allow the propagation of the optical signal along that waveguide, with the remaining attenuating elements associated with the non-selected output waveguides being switched to art "off state to extinguish any minor portion of the power of the input signal that may have entered those output waveguides.
  • pin diode attenuating elements used in the above-described embodiment are a preferred type of in-line attenuating element for this invention because they exhibit low insertion loss and low polarisation dependency, but can achieve high levels of attenuation greater than -20dB.
  • the present invention is applied to an optical switch as part of an SOI integrated device.
  • the present invention is also applicable to other types of systems such as devices based on polymers and other semiconductor materials such as III-V.

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 Integrated Circuits (AREA)

Abstract

La présente invention concerne un système optique comprenant: un dispositif optique intégré présentant un élément de circuit photonique à commande électronique destiné à recevoir un signal optique d'au moins une trajectoire optique, et à diriger de manière sélective le signal optique vers une ou plusieurs trajectoires optiques de sortie sélectionnées d'une pluralité, et étant électriquement réglable entre une pluralité d'états dans lesquels le signal optique d'entrée est dirigé de manière sélective vers une trajectoire de sortie différente ou combinaison de trajectoires de sortie différente; des éléments d'atténuation de diode PIN commandables électriquement, associés à chacune des trajectoires de sortie; et un circuit électrique destiné à commander les éléments d'atténuation de diode PIN en coopération avec l'élément de circuit photonique de sorte que les éléments d'atténuation de diode PIN associés à une ou plusieurs des trajectoires sélectionnées se trouvent dans un état passant, et que les éléments d'atténuation de diode PIN associés à des trajectoires de sortie autres que les trajectoires sélectionnées, se trouvent dans un état non passant afin de supprimer sensiblement toute puissance de signal dans ces trajectoires de sortie.
PCT/GB2002/003481 2001-08-08 2002-07-29 Systeme optique Ceased WO2003014822A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002317400A AU2002317400A1 (en) 2001-08-08 2002-07-29 Electro-optic controlsystem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0119369.7 2001-08-08
GBGB0119369.7A GB0119369D0 (en) 2001-08-08 2001-08-08 Optic system

Publications (2)

Publication Number Publication Date
WO2003014822A2 true WO2003014822A2 (fr) 2003-02-20
WO2003014822A3 WO2003014822A3 (fr) 2004-02-19

Family

ID=9920047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/003481 Ceased WO2003014822A2 (fr) 2001-08-08 2002-07-29 Systeme optique

Country Status (3)

Country Link
AU (1) AU2002317400A1 (fr)
GB (1) GB0119369D0 (fr)
WO (1) WO2003014822A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7666855B2 (en) 2004-02-13 2010-02-23 Metabasis Therapeutics, Inc. 2′-C-methyl nucleoside derivatives
US9994600B2 (en) 2014-07-02 2018-06-12 Ligand Pharmaceuticals, Inc. Prodrug compounds and uses therof
US10449210B2 (en) 2014-02-13 2019-10-22 Ligand Pharmaceuticals Inc. Prodrug compounds and their uses
US11970482B2 (en) 2018-01-09 2024-04-30 Ligand Pharmaceuticals Inc. Acetal compounds and therapeutic uses thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033811A (en) * 1988-11-04 1991-07-23 The Furukawa Electric Co., Ltd. Optical switch
FR2728083B1 (fr) * 1994-12-08 1997-01-10 Alcatel Nv Commutateur optique binaire compact
WO2000002085A1 (fr) * 1998-07-01 2000-01-13 Nec Corporation Commutateur optique matriciel et multiplexeur optique a insertion-extraction

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7666855B2 (en) 2004-02-13 2010-02-23 Metabasis Therapeutics, Inc. 2′-C-methyl nucleoside derivatives
US10449210B2 (en) 2014-02-13 2019-10-22 Ligand Pharmaceuticals Inc. Prodrug compounds and their uses
US11278559B2 (en) 2014-02-13 2022-03-22 Ligand Pharmaceuticals Incorporated Prodrug compounds and their uses
US9994600B2 (en) 2014-07-02 2018-06-12 Ligand Pharmaceuticals, Inc. Prodrug compounds and uses therof
US10150788B2 (en) 2014-07-02 2018-12-11 Ligand Pharmaceuticals, Inc. Prodrug compounds and uses thereof
US11970482B2 (en) 2018-01-09 2024-04-30 Ligand Pharmaceuticals Inc. Acetal compounds and therapeutic uses thereof

Also Published As

Publication number Publication date
WO2003014822A3 (fr) 2004-02-19
AU2002317400A1 (en) 2003-02-24
GB0119369D0 (en) 2001-10-03

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