WO2005122479A2 - A multiport variable optical attenuator architecture, and parts thereof - Google Patents
A multiport variable optical attenuator architecture, and parts thereof Download PDFInfo
- Publication number
- WO2005122479A2 WO2005122479A2 PCT/IB2005/051878 IB2005051878W WO2005122479A2 WO 2005122479 A2 WO2005122479 A2 WO 2005122479A2 IB 2005051878 W IB2005051878 W IB 2005051878W WO 2005122479 A2 WO2005122479 A2 WO 2005122479A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- manipulated
- optical signals
- architecture
- manipulating means
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 146
- 230000002238 attenuated effect Effects 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims description 25
- 239000012788 optical film Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 11
- 239000010408 film Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 6
- 239000004038 photonic crystal Substances 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 2
- 238000005530 etching Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
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
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
Definitions
- the present invention relates to optical attenuator architecture for performing high- resolution variable optical attenuation of a wide range of optical wavelengths.
- Preferred embodiments of the present invention have particular, although not exclusive, utility in intelligent optical networks, optical measuring instruments, fiber- array-based systems, photonic signal processors, current sensing, dense optical computers, and displays.
- optical systems include, but are not restricted to, telecommunications systems, cable television systems, local area networks (LANs), current sensors, and displays.
- Most existing multiport optical attenuators are limited to a few ports with most of the intelligence performed by discrete electronics on both sides of the optical link.
- intelligent optical systems have been devised that include, in certain instances, many nodes linked by a number of different optical links. Although this multiple optical linking can significantly increase the capacity and flexibility of these optical systems, a cost-effective, compact-size, reliable, and dense multiport optical attenuator architecture must be found to interface with such systems, which offers the stability requirements for future applications requiring higher channel numbers.
- Dynamic optical attenuation is a power management process where the power of an optical signal is arbitrarily attenuated. Precise variable optical attenuation enables dynamic attenuation change, which is crucial for many emerging applications. In an exceptional case, where optical signals propagate through an optical fiber array, it is advantageous to be able to arbitrarily attenuate those signals to generate a particular power profile.
- a multiport variable optical attenuation architecture including a first optical signal manipulating means coupled to the input means, to manipulate optical signals input thereto and output first manipulated optical signals; a second optical signal manipulating means arranged to receive the first manipulated optical signals from the first optical manipulating means, and to adaptively manipulate the received first manipulated optical signals input thereto so as to output second manipulated optical signals; and a third optical signal manipulating means arranged to receive the second manipulated optical signals, and to a predetermined manipulation of the second manipulated optical signals so as to output an attenuated signal.
- the first optical manipulating means comprises an optical waveguide array and polarizer means to manipulate the optical signals input thereto by filtering and polarising the same.
- the first optical manipulating means is a photonic crystal fibre array adapted to maintain single mode operation with bandpass optical filtering.
- the fibre may be a 2-D polarization maintaining, tapered photonic crystal fibre array that maintains light polarization, provides single mode operation with bandpass optical filtering, and concentrates the output optical powers into higher density and hence smooth spatial light non-uniformities. In this manner the numerical aperture of the fibres is increased, thus achieving a higher viewing angle in display applications.
- the third optical signal manipulating means is an analyser film rotated 90 degrees to the polarizer means, so that said predetermined manipulation involves only passing light with a polarization that is perpendicular to the polarization of said first manipulated optical signals.
- the first optical signal manipulating means does not have a polarizer means integrated therewith, and instead discrete polarizer means may be arranged between the first and second optical signal manipulating means for polarizing individual signals generated by the first optical signal generating means prior to said second optical signal manipulating means receiving said first manipulated optical signals.
- the second optical manipulating means includes a magneto-optical film.
- the magneto-optical film is a Bi-YIG film.
- the magneto-optical film is driven by an integrated switching circuit integrally formed therewith to adaptively manipulate the received first manipulated optical signals input thereto.
- the integrated switching circuit is etched within the film core or may alternatively be deposited on the film surface, to generate a 2-dimensional magnetic field profile.
- the integrated switching circuit includes a micro-coil array that generates arbitrary magnetic fields along the direction of propagation of the input optical signals to rotate the polarization of the optical signals.
- the architecture includes a permanent magnet disposed between the second and the third optical signal manipulating means that applies an additional permanent magnetic field to the magnetic field generated by the micro coil elements. The permanent magnetic field is parallel to the propagation direction of the input light.
- the first, second and third optical signal manipulating means are integrated to provide an integral structure.
- a method for manipulating input optical signals to produce an attenuated output signal including: [22] polarizing and filtering the input optical signals to produce a first manipulated optical signal; [23] arbitrarily rotating the polarizations of the first manipulated optical signals to produce a second manipulated optical signal; and [24] passing a variable fraction of the second manipulated optical signals depending upon the degree of rotation to provide the attenuated output signal.
- the method includes controlling currents fed through micro-coils to generate a magnetic field profile on said first manipulated optical signals, said magnetic field profile performing said arbitrary rotating; said rotating adjusting the amount of polarization of individual elements of the first manipulated optical signal to provide said second manipulated optical signals, and analysing the second manipulated optical signals so that a variable optical attenuation is achieved.
- a cost-effective, hardware-compressed, basic and versatile variable optical attenuator array can be provided that can be used for dense multiport optical systems.
- Figure 1 shows the layout of a preferred embodiment for the multiport variable optical attenuator architecture of the present invention
- Figure 2 shows a result of a method for depositing micro-coils on the surface of a magneto-optical film
- Figure 3 shows a result of a method for etching a 3 D coil structure within the core of a magneto-optical film
- Figure_4 shows a result of a method for depositing conductive materials into the etched 3 D coil shown in Figure 3 to realize a micro coil.
- the best mode for carrying out the invention is directed towards a dense multiport variable optical attenuator architecture for a photonic system.
- the attenuator architecture generally employs an optical waveguide array, a polarizer, an integrated polarization rotator array, and an analyser, that can dynamically be configured to perform high-resolution variable optical attenuation of a wide range of optical wavelengths.
- the multiport variable optical attenuator architecture 100 includes a first optical signal manipulating means in the form of a tapered polarization maintaining photonic crystal fibre array (TPMPCFA) 105 including a plurality of photonic crystal fibres 108, a second optical signal manipulating means in the form of a magneto-optical film 110 having a micro-coil array 115 integrally formed therewith, and a third optical signal manipulating means in the form of an analyzer 120.
- TMPCFA tapered polarization maintaining photonic crystal fibre array
- Input optical signals launched into the multiport variable optical attenuator ports are first polarized and spectrally filtered by the TPMPCFA 105 to produce first manipulated optical signals.
- the polarized first manipulated optical signals then pass through the magneto-optical film 110 where their polarizations are independently rotated by controlling the amount of electric current fed into the elements of the micro- coil array 115 to produce second manipulated optical signals. These currents generate a variable magnetic field parallel to the propagation direction of the optical signals.
- the polarization direction of a polarization rotated optical signal is not aligned with the polarization direction of the analyzer 120, a fraction of the propagating optical signal is blocked by the analyzer 120, thus attenuating that optical signal.
- a permanent magnet 125 is provided in the form of a film formed on the surface of the second optical signal manipulating means to apply a constant magnetic field perpendicular to the magneto-optical film 110.
- the role of the permanent magnet 125 is to convert the magnetic domains inside the magneto-optical film 110 into a single domain, thus reducing the excess optical loss.
- the polarization directions of the TPMPCFA 105 and the analyzer 120 are usually perpendicular to each other when no polarization rotation is provided to the micro-coil array 115.
- Figure 2 shows a conductive planar micro-coil 205 deposited on the magneto-opti cal film 110.
- the material of the micro-coil 205 can be any conductive material such as copper or aluminium.
- a micro-coil array can also be fabricated to have a low resistance and a large number of turns.
- Figure 3 shows the process for realising a micro-coil within the core of a magneto- optical film.
- a cylindrical groove 305 of depth equal to the depth of the magneto-optical film 110, is etched within the core of the magneto optical film 110, as shown in Figure 3.
- the groove can be realised by laser etching.
- Ultra-short pulsed lasers with pico- and femto-second pulse duration and high peak power can limit the heat affected zone and make the material removal process dominated by ablation thus achieving excellent etching accuracy in magneto-optical films.
- variable attenuation can be achieved. Furthermore, by using a fibre array for the input ports and an integrated variable polarization rotator array, one can realise a cost-effective, static, multi-port variable optical attenuator.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007526653A JP4891905B2 (en) | 2004-06-09 | 2005-06-08 | Multi-port variable optical attenuator structure and its parts |
CN2005800268781A CN101023382B (en) | 2004-06-09 | 2005-06-08 | A multiport variable optical attenuator architecture, and parts thereof |
EP05744701A EP1766445A4 (en) | 2004-06-09 | 2005-06-08 | A multiport variable optical attenuator architecture, and parts thereof |
AU2005253316A AU2005253316B2 (en) | 2004-06-09 | 2005-06-08 | A multiport variable optical attenuator architecture, and parts thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004903110A AU2004903110A0 (en) | 2004-06-09 | Multiport Variable Optical Attenuator Patent | |
AU2004903110 | 2004-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005122479A2 true WO2005122479A2 (en) | 2005-12-22 |
WO2005122479A3 WO2005122479A3 (en) | 2006-07-27 |
Family
ID=35503846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2005/051878 WO2005122479A2 (en) | 2004-06-09 | 2005-06-08 | A multiport variable optical attenuator architecture, and parts thereof |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1766445A4 (en) |
JP (1) | JP4891905B2 (en) |
KR (1) | KR20070054176A (en) |
CN (1) | CN101023382B (en) |
WO (1) | WO2005122479A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109541752B (en) * | 2018-11-06 | 2020-06-16 | 重庆邮电大学 | Tunable optical attenuator based on all-fiber optical control system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5999305A (en) | 1997-10-20 | 1999-12-07 | Fujitsu Limited | Optical device which makes use of magneto-optical effect |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5521726A (en) * | 1994-08-26 | 1996-05-28 | Alliedsignal Inc. | Polarizer with an array of tapered waveguides |
JP3667827B2 (en) * | 1995-08-29 | 2005-07-06 | 富士通株式会社 | Faraday rotator |
JP3587302B2 (en) * | 2000-06-21 | 2004-11-10 | 松下電器産業株式会社 | Photonic crystal fabrication method and optical device using photonic crystal |
JP4521609B2 (en) * | 2000-09-11 | 2010-08-11 | ミネベア株式会社 | Magneto-optical body and optical isolator using the magneto-optical body |
US6542647B2 (en) * | 2000-10-27 | 2003-04-01 | Matsushita Electric Industrial Co., Ltd. | Optical signal transmission system and magneto-optical modulator designed to establish modulation over wide range for use in the same |
JP4056726B2 (en) * | 2000-10-27 | 2008-03-05 | 松下電器産業株式会社 | Optical signal transmission system and magneto-optic modulator used therefor |
WO2002084362A1 (en) * | 2001-04-12 | 2002-10-24 | Omniguide Communications Inc. | High index-contrast fiber waveguides and applications |
JP4330923B2 (en) * | 2002-05-09 | 2009-09-16 | パナソニック株式会社 | Optical isolator integrated magneto-optical modulator, method for manufacturing the same, and optical communication system using the optical isolator integrated magneto-optical modulator |
JP2004077617A (en) * | 2002-08-12 | 2004-03-11 | Tdk Corp | Variable light attenuator with optical isolator function |
US7133579B2 (en) * | 2002-10-18 | 2006-11-07 | The Governors Of The University Of Alberta | High-speed magneto-optic modulator |
CN2596384Y (en) * | 2002-12-26 | 2003-12-31 | 武汉光迅科技有限责任公司 | High reliability liquid crystal array variable attenuator |
-
2005
- 2005-06-08 WO PCT/IB2005/051878 patent/WO2005122479A2/en active Application Filing
- 2005-06-08 EP EP05744701A patent/EP1766445A4/en not_active Withdrawn
- 2005-06-08 JP JP2007526653A patent/JP4891905B2/en not_active Expired - Fee Related
- 2005-06-08 CN CN2005800268781A patent/CN101023382B/en not_active Expired - Fee Related
- 2005-06-08 KR KR1020077000114A patent/KR20070054176A/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5999305A (en) | 1997-10-20 | 1999-12-07 | Fujitsu Limited | Optical device which makes use of magneto-optical effect |
Also Published As
Publication number | Publication date |
---|---|
CN101023382A (en) | 2007-08-22 |
EP1766445A2 (en) | 2007-03-28 |
EP1766445A4 (en) | 2009-07-29 |
WO2005122479A3 (en) | 2006-07-27 |
JP4891905B2 (en) | 2012-03-07 |
KR20070054176A (en) | 2007-05-28 |
JP2008502024A (en) | 2008-01-24 |
CN101023382B (en) | 2010-05-05 |
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