NL192171C - Optical demultiplexer. - Google Patents
Optical demultiplexer. Download PDFInfo
- Publication number
- NL192171C NL192171C NL8401315A NL8401315A NL192171C NL 192171 C NL192171 C NL 192171C NL 8401315 A NL8401315 A NL 8401315A NL 8401315 A NL8401315 A NL 8401315A NL 192171 C NL192171 C NL 192171C
- Authority
- NL
- Netherlands
- Prior art keywords
- fibers
- waveguide
- lens
- fiber
- waveguides
- Prior art date
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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
-
- 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
- G02B6/29305—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 as bulk element, i.e. free space arrangement external to a light guide
- G02B6/29307—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 as bulk element, i.e. free space arrangement external to a light guide components assembled in or forming a solid transparent unitary block, e.g. for facilitating component alignment
-
- 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
- G02B6/29305—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 as bulk element, i.e. free space arrangement external to a light guide
- G02B6/2931—Diffractive element operating in reflection
-
- 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
- G02B6/29379—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 characterised by the function or use of the complete device
- G02B6/2938—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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
Description
1 1921711 192171
Optische demultiplexerOptical demultiplexer
De uitvinding heeft betrekking op een optische demultiplexer, omvattende: een lineair stelsel van optische enkelmodus vezels, waarvan er één een ingangsvezel is die is ingericht om een golflengtemultiptex 5 lichtbundel te ontvangen, terwijl meerdere van genoemde vezels uitgangsvezels zijn; een diffractierooster en een lens voor het koppelen van de componenten van de lichtbundel uit de ingangsvezel naar respectieve van de uitgangsvezels; en een geTntegreerd optisch convergerend golfgeleiderstelsel dat is aangebracht tussen de vezels en de lens en dat een aantal in een substraat met relatief kleine brekingsindex ingebedde golfgeleiderstroken omvat, waarbij de afstand tussen naburige golfgeleiderstroken groter is aan het nabij de 10 vezels gelegen uiteinde van het golfgeleiderstelsel dat aan het nabij de lens gelegen uiteinde van het golfgeleiderstelsel.The invention relates to an optical demultiplexer, comprising: a linear array of single mode optical fibers, one of which is an input fiber adapted to receive a wavelength multiplex light beam, while several of said fibers are output fibers; a diffraction grating and a lens for coupling the components of the light beam from the input fiber to respective of the output fibers; and an integrated optical converging waveguide array disposed between the fibers and the lens and comprising a plurality of waveguide strips embedded in a relatively small index of refraction substrate, the distance between adjacent waveguide strips being greater at the end of the waveguide array located near the fibers at the end of the waveguide array located near the lens.
Een dergelijke demutiplexer is bekend uit de Japanse octrooiaanvrage 56.126.806.Such a demutiplexer is known from Japanese patent application 56,126,806.
In de optische communicatietechniek zijn de daarbij toegepaste optische vezels de laatste tijd dermate verbeterd, dat het golflengtegebied waar de verliezen gering zijn, vergroot is. Hiervan wordt nuttig gebruik 15 gemaakt door langs elke vezel meerdere signalen van onderling verschillende golflengte gelijktijdig over te dragen; de lichtbundel in een dergelijke vezel wordt aangeduid met de term ’’golflengtemultiplex lichtbundel”. Bij een dergelijke techniek is het noodzakelijk om de golflengtemultiptex lichtbundel ruimtelijk te kunnen scheiden in bundels met steeds één golflengte, die worden overgedragen langs respectieve vezels, teneinde de afzonderlijke bundels individueel en onafhankelijk verder te kunnen verwerken. Bij wijze van voorbeeld 20 kan een dergelijke scheiding worden uitgevoerd door middel van organen die hoekdispersie vertonen, zoals een tralie. In dit verband wordt bij wijze van voorbeeld gewezen op de publicaties ’Optical Devices for Wavelength Multiplexing and Demultiplexing” van W.J. Tomlinson; ’’High-capacity Wavelength Demultiplexer with a Large Diameter GRIN Rod Lens” van B.D. Metcalf et al in Applied Optics, maart 1982, vol. 21, nr. 5, biz. 794-796; en ”20-Channel Micro-Optic Grating Demultiplexer fdPI .1-1.6 pm Band using a Small 25 Focusing Parameter Graded-lndex Rod Lens” van M. Sekt et al in Electronics Letters, maart 1982, vol. 18, nr. 6, biz. 257-258.In optical communication technology, the optical fibers used therewith have recently been improved to such an extent that the wavelength range where the losses are small has been increased. Use is made of this by simultaneously transmitting several signals of mutually different wavelengths along each fiber; the light beam in such a fiber is designated by the term "wavelength multiplex light beam". In such a technique it is necessary to be able to spatially separate the wavelength multiptex light beam into beams of one wavelength each, which are transferred along respective fibers, in order to be able to further process the individual beams individually and independently. By way of example 20, such separation can be performed by means of angular dispersion means such as a grating. In this context, reference is made, for example, to the publications "Optical Devices for Wavelength Multiplexing and Demultiplexing" by W.J. Tomlinson; High-capacity Wavelength Demultiplexer with a Large Diameter GRIN Rod Lens from B.D. Metcalf et al in Applied Optics, March 1982, vol. 21, No. 5, biz. 794-796; and "20-Channel Micro-Optic Grating Demultiplexer fdPI .1-1.6 pm Band using a Small 25 Focusing Parameter Graded-Index Rod Lens" from M. Sekt et al in Electronics Letters, March 1982, vol. 18, No. 6, biz. 257-258.
Bij enkelmodusvezels is de kemdiameter klein ten opzichte van de buitendiameter van de mantel. Zoals blijkt uit de voomoemde Japanse octrooiaanvrage, resulteert hieruit het probleem, dat geen dichte pakking kan worden verkregen van de kanalen, hetgeen leidt tot een ondoelmatig gebruik van de beschikbare 30 bandbreedte. Voor het vergroten van de verpakkingsdichtheid van de kanalen is in de genoemde Japanse octrooiaanvrage het gebruik van een golfgeleiderstelsel met convergerende golfgeleiders voorgesteld.In single mode fibers, the core diameter is small relative to the outer diameter of the jacket. As can be seen from the aforementioned Japanese patent application, this results in the problem that dense packing of the channels cannot be obtained, resulting in inefficient use of the available bandwidth. In order to increase the packing density of the channels, the aforementioned Japanese patent application proposes the use of a waveguide system with converging waveguides.
De onderhavige uitvinding beoogt een nog dichtere pakking van kanalen te verschaffen.The present invention aims to provide an even denser packing of channels.
De onderhavige uitvinding is gebaseerd op het inzicht, dat de bereikbare grens van de pakkingsdichtheid niet zozeer wordt bepaald door puur geometrische overwegingen, maar door de overspraak tussen kanalen. 35 In het bijzonder beoogt de onderhavige uitvinding derhalve de overspraak tussen kanalen te verminderen. Daartoe heeft volgens een eerste aspect van de uitvinding, de optische demultiplexer van het bovengenoemde type het kenmerk, dat zich in het substraat tussen naburige golfgeleiderstroken groeven uitstrekken bij het nabij de lens gelegen uiteinde van het golfgeleiderstelsel.The present invention is based on the recognition that the achievable packing density limit is not so much determined by purely geometric considerations as by crosstalk between channels. In particular, the present invention therefore aims to reduce cross-talk between channels. To this end, according to a first aspect of the invention, the optical demultiplexer of the aforementioned type is characterized in that grooves extend in the substrate between adjacent waveguide strips at the end of the waveguide array located near the lens.
Volgens een tweede aspect van de uitvinding heeft de optische demultiplexer van het bovengenoemde 40 type het kenmerk, dat de voörtplantingsconstanten van naburige golfgeleiders van het golfgeleiderstelsel ongelijk zijn.According to a second aspect of the invention, the optical demultiplexer of the above-mentioned type is characterized in that the propagation constants of neighboring waveguides of the waveguide system are uneven.
De uitvinding zal onderstaand nader worden toegelicht onder verwijzing naar de tekening. Daarbij toont: figuur 1 een bekende demultiplexinrichting van het reflectietype met buigingsroosters; 45 figuur 2 de responsiekarakteristiek van de demultiplexinrichting volgens figuur 1; figuur 3 een demultiplexinrichting met een convergerend golfgeleiderstelsel; figuur 4 een golfgeleidersubstraat voorzien van groeven.The invention will be explained in more detail below with reference to the drawing. In the drawing: figure 1 shows a known demultiplexer of the reflection type with diffraction gratings; Fig. 2 shows the response characteristic of the demultiplexer according to Fig. 1; Figure 3 shows a demultiplexing device with a converging waveguide system; Figure 4 shows a waveguide substrate provided with grooves.
In de tekening toont figuur 1 een bekende multiplex-/demultiplexinrichting 10 van het reflectietype met 50 buigingsrooster. Ter illustratie en ter toelichting is de inrichting weergegeven werkend als demultiplexinrichting, voorzien van een optische multimodusvezel 9 als gemeenschappelijke ingang en een lineair stelsel van optische multimodus-uitgangsvezels 11-1.11-2....11-6. Signalen bij verschillende golflengten λ-,, λ^.—λβ, die door de vezel 9 worden geleverd, worden ruimtelijk gescheiden door middel van een gegroefd buigingsrooster 13 van het reflectietype. Een lens 12, welke tussen het vezelstelsel en het rooster is opgesteld, dient 55 om de verschillende optische bundels te focusseren.In the drawing, Figure 1 shows a known reflection-type multiplex / demultiplexer 10 with 50 diffraction grating. For illustrative and illustrative purposes, the device is shown to operate as a demultiplexer, incorporating a multimode optical fiber 9 as a common input and a linear array of multimode optical output fibers 11-1.11-2 ... 11-6. Signals at different wavelengths λ-, λ ^ .— λβ, which are supplied by the fiber 9, are spatially separated by means of a grooved reflection type diffraction grating 13. A lens 12 disposed between the fiber system and the grid serves 55 to focus the different optical beams.
Tijdens het bedrijf wordt golfenergie bij de golflengten van λ1( λ2·...λ6, geëmitteerd door de vezel 9, gefocusseerd op het rooster 13, van waaruit de energie selectief wordt teruggekaatst. De resulterendeDuring operation, wave energy at the wavelengths of λ1 (λ2 · ... λ6, emitted by the fiber 9, is focused on the grid 13, from which the energy is selectively reflected.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US48853783A | 1983-04-25 | 1983-04-25 | |
US48853783 | 1983-04-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
NL8401315A NL8401315A (en) | 1984-11-16 |
NL192171B NL192171B (en) | 1996-10-01 |
NL192171C true NL192171C (en) | 1997-02-04 |
Family
ID=23940052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL8401315A NL192171C (en) | 1983-04-25 | 1984-04-24 | Optical demultiplexer. |
Country Status (8)
Country | Link |
---|---|
JP (2) | JPS59210413A (en) |
CA (1) | CA1257415A (en) |
DE (1) | DE3414724A1 (en) |
FR (1) | FR2544883B1 (en) |
GB (1) | GB2139374B (en) |
IT (1) | IT1176113B (en) |
NL (1) | NL192171C (en) |
SE (1) | SE454121B (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0173930A3 (en) * | 1984-09-01 | 1988-01-27 | Alcatel N.V. | Optical multiplexer/demultiplexer |
GB8431087D0 (en) * | 1984-12-10 | 1985-01-16 | Secr Defence | Multiplexing & demultiplexing systems |
US4736360A (en) * | 1986-07-21 | 1988-04-05 | Polaroid Corporation | Bulk optic echelon multi/demultiplexer |
GB8718560D0 (en) * | 1987-08-05 | 1987-09-09 | Gec Avionics | Nuclear pulse simulation |
GB2219869B (en) * | 1988-06-15 | 1992-10-14 | British Telecomm | Optical coupling device |
GB2251957B (en) * | 1990-11-29 | 1993-12-15 | Toshiba Kk | Optical coupler |
DE4134293C1 (en) * | 1991-10-17 | 1993-02-11 | Messer Griesheim Gmbh, 6000 Frankfurt, De | |
FR2765972B1 (en) * | 1997-07-11 | 1999-09-24 | Instruments Sa | WAVELENGTH-DISPERSION OPTICAL SYSTEM |
US7236660B2 (en) | 2002-05-20 | 2007-06-26 | Jds Uniphase Corporation | Reconfigurable optical add-drop module, system and method |
CN100422777C (en) * | 2002-11-01 | 2008-10-01 | 欧姆龙株式会社 | Optical multiplexer/demultiplexer and production method for optical multiplexer/demultiplexer |
EP4002724A1 (en) | 2015-12-13 | 2022-05-25 | Genxcomm, Inc. | Interference cancellation methods and apparatus |
US10257746B2 (en) | 2016-07-16 | 2019-04-09 | GenXComm, Inc. | Interference cancellation methods and apparatus |
US11150409B2 (en) | 2018-12-27 | 2021-10-19 | GenXComm, Inc. | Saw assisted facet etch dicing |
US10727945B1 (en) | 2019-07-15 | 2020-07-28 | GenXComm, Inc. | Efficiently combining multiple taps of an optical filter |
US11215755B2 (en) | 2019-09-19 | 2022-01-04 | GenXComm, Inc. | Low loss, polarization-independent, large bandwidth mode converter for edge coupling |
US11539394B2 (en) | 2019-10-29 | 2022-12-27 | GenXComm, Inc. | Self-interference mitigation in in-band full-duplex communication systems |
US11796737B2 (en) | 2020-08-10 | 2023-10-24 | GenXComm, Inc. | Co-manufacturing of silicon-on-insulator waveguides and silicon nitride waveguides for hybrid photonic integrated circuits |
CA3234722A1 (en) | 2021-10-25 | 2023-05-04 | Farzad Mokhtari-Koushyar | Hybrid photonic integrated circuits for ultra-low phase noise signal generators |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3986020A (en) * | 1975-09-25 | 1976-10-12 | Bell Telephone Laboratories, Incorporated | Common medium optical multichannel exchange and switching system |
US4111524A (en) * | 1977-04-14 | 1978-09-05 | Bell Telephone Laboratories, Incorporated | Wavelength division multiplexer |
JPS56126806A (en) * | 1980-03-11 | 1981-10-05 | Nec Corp | Diffraction grating type light branching filter |
DE3239336A1 (en) * | 1982-10-23 | 1984-04-26 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Optical wavelength-division multiplexer |
-
1984
- 1984-04-18 SE SE8402180A patent/SE454121B/en not_active IP Right Cessation
- 1984-04-18 CA CA000452260A patent/CA1257415A/en not_active Expired
- 1984-04-18 DE DE19843414724 patent/DE3414724A1/en active Granted
- 1984-04-19 GB GB08410197A patent/GB2139374B/en not_active Expired
- 1984-04-20 FR FR848406282A patent/FR2544883B1/en not_active Expired - Fee Related
- 1984-04-20 IT IT20660/84A patent/IT1176113B/en active
- 1984-04-24 NL NL8401315A patent/NL192171C/en not_active IP Right Cessation
- 1984-04-25 JP JP59082099A patent/JPS59210413A/en active Pending
-
1993
- 1993-04-26 JP JP021518U patent/JPH0676907U/en active Pending
Also Published As
Publication number | Publication date |
---|---|
NL192171B (en) | 1996-10-01 |
NL8401315A (en) | 1984-11-16 |
SE454121B (en) | 1988-03-28 |
GB2139374B (en) | 1986-07-16 |
IT8420660A1 (en) | 1985-10-20 |
FR2544883B1 (en) | 1992-04-17 |
IT1176113B (en) | 1987-08-12 |
GB2139374A (en) | 1984-11-07 |
SE8402180D0 (en) | 1984-04-18 |
JPH0676907U (en) | 1994-10-28 |
JPS59210413A (en) | 1984-11-29 |
IT8420660A0 (en) | 1984-04-20 |
DE3414724A1 (en) | 1984-10-25 |
DE3414724C2 (en) | 1993-07-22 |
FR2544883A1 (en) | 1984-10-26 |
SE8402180L (en) | 1984-10-26 |
GB8410197D0 (en) | 1984-05-31 |
CA1257415A (en) | 1989-07-11 |
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