DE19903523A1 - Delay system for an optical transmission system includes Bragg grating with variable positioning - Google Patents
Delay system for an optical transmission system includes Bragg grating with variable positioningInfo
- Publication number
- DE19903523A1 DE19903523A1 DE1999103523 DE19903523A DE19903523A1 DE 19903523 A1 DE19903523 A1 DE 19903523A1 DE 1999103523 DE1999103523 DE 1999103523 DE 19903523 A DE19903523 A DE 19903523A DE 19903523 A1 DE19903523 A1 DE 19903523A1
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- polarization
- delay line
- differential delay
- line according
- variable optical
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- 230000003287 optical effect Effects 0.000 title claims description 24
- 230000005540 biological transmission Effects 0.000 title claims description 5
- 230000010287 polarization Effects 0.000 claims abstract description 42
- 239000006185 dispersion Substances 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
Classifications
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- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
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- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2726—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide
- G02B6/274—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide based on light guide birefringence, e.g. due to coupling between light guides
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- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/278—Controlling polarisation mode dispersion [PMD], e.g. PMD compensation or emulation
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- 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
- G02B6/29317—Light guides of the optical fibre type
- G02B6/29322—Diffractive elements of the tunable type
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2569—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation 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
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
-
- 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
- G02B6/29392—Controlling dispersion
- G02B6/29394—Compensating wavelength dispersion
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Optical Communication System (AREA)
- Optical Integrated Circuits (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine optische Differential-Verzögerungsleitung, die es gestattet, orthogonal polarisierte Anteile einer Lichtwelle unterschiedlich zu verzögern und danach wieder in einem Wellenleiter zusammenzuführen. Der Gruppenlaufzeitunterschied zwischen den Anteilen in den Polarisationszuständen ist dabei variabel einstellbar.The present invention relates to an optical differential delay line which it allows orthogonally polarized components of a light wave to be delayed differently and then merge again in a waveguide. The group delay difference the proportions in the polarization states can be variably adjusted.
Verzögerungsleitungen werden standardmäßig durch mechanisch verschiebbare Komponenten in Freistrahlanordnungen realisiert. Nach der Offenlegungsschrift DE 197 17 457 A1 des Deutschen Patentamtes sind auch variable Verzögerungsleitungen mit Wellenleitern und sogenannten gechirpten Bragg-Gittern bekannt. Solche Anordnungen können mit Hilfe polarisationsteilender Bauelemente auch als Differential- Verzögerungsleitungen realisiert werden.Delay lines are made standard by mechanically movable Components realized in free jet arrangements. According to the published patent application DE 197 17 457 A1 of the German Patent Office are also variable delay lines with Waveguides and so-called chirped Bragg gratings known. Such orders can also be used as differential Delay lines can be realized.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine wellenleiteroptische Differential-Verzögerungsleitung zu realisieren, die einen kompakten Aufbau besitzt, prinzipiell geringe Verluste aufweist, in der Grundversion mit einem einzelnen reversibel veränderbaren Wellenleitergitter auskommt, eine schnelle Einstellung gewünschter Laufzeitdifferenzen ermöglicht und eine Hintereinanderschaltung (Kaskadierung) insbesondere für mehrere Wellenlängenkomponenten ermöglicht.The present invention has for its object a waveguide optical To implement differential delay line, which has a compact structure, basically has low losses, reversible in the basic version with a single changeable waveguide grating, a quick adjustment of the desired Runtime differences made possible and a series connection (cascading) in particular for several wavelength components.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein eintreffender Lichtstrom durch einen Viertor-Polarisations-Richtkoppler in zwei orthogonal zueinander polarisierte Anteile aufgespalten wird und diese Anteile kontradirektional in eine Wellenleiterschleife eingekoppelt werden, die die beiden Ausgangstore des Richtkopplers verbindet. Innerhalb dieser Schleife befindet sich ein Wellenleiter-Bragg-Gitter mit ortsvariabler Gitterkonstanten ("gechirptes Gitter"), welches die beiden Teillichtströme eines Wellenlängenkanals jeweils reflektiert. Die Anordnung wird durch polarisationsoptische Elemente so ausgelegt, das diese reflektierten Anteile den Richtkoppler in dem vierten Tor verlassen. Durch eine Abstimmung des Bragg-Gitters wie in der o. g. Offenlegungsschrift DE 197 17 457 A1 des Deutschen Patentamtes beschrieben - beispielsweise durch leichte Dehnung - kann der effektive Reflexionspunkt innerhalb des Gitters erheblich verschoben werden. Durch die kontradirektionale Lichtführung ergibt sich dadurch eine differentielle Laufzeitänderung, die dem Doppelten der Reflexionspunktsverschiebung entspricht. Ein weiterer Wellenlängenkanal, den das genannte erste Gitter nicht reflektiert, kann durch eine weiteres, in Serie angebrachtes, Bragg-Gitter in entsprechender Weise behandelt werden. Die Reflexionsmittenwellenlänge des zweiten Gitters richtet sich nach der Mittenwellenlänge des zweiten Kanals, sein Reflexionsspektrum soll so gestaltet sein, daß es wenig mit dem Reflexionsspektrum des ersten Gitters überlappt. Weitere Wellenlängenkanäle lassen sich sich entsprechend behandeln. Sollen verschiedene Wellenlängenkanäle in unterschiedliche Polarisationszustände zerlegt werden, so können verschiedene Wellenleiterschleifen, die jeweils nur ein für einen Wellenlängenkanal bestimmtes Bragg-Gitter enthalten, unter Zwischenschaltung von Polarisationsstellern kaskadiert werden. Die einzelnen Schleifen sind dabei durch Polarisationskomponenten so zu gestalten, daß die nichtreflektierten Anteile den Richtkoppler ebenfalls am vierten Tor verlassen. In entsprechender Weise können verschiedene Schleifen hintereinandergeschaltet werden, die für denselben Wellenlängenkanal bestimmt sind. Dadurch lassen sich beispielsweise bei der Kompensation von Polarisationsmodendispersion Kompensationen höherer Ordnung realisieren. Für andere Anwendungen ist es sinnvoll, die nichtreflektierten Anteile in den Zuführungswellenleiter zurückzukoppeln. Diese Betriebsart ist ebenfalls durch polarisationsoptische Elemente in der Schleife realisierbar.This object is achieved in that an incoming luminous flux through a four-port polarization directional coupler in two orthogonally polarized parts is split up and these parts contradirectionally into a waveguide loop be coupled in, which connects the two output gates of the directional coupler. Within This loop contains a waveguide Bragg grating with spatially variable grating constants ("chirped grating"), which each of the two partial light fluxes of a wavelength channel reflected. The arrangement is designed by polarization-optical elements so that this reflected portions leave the directional coupler in the fourth gate. By voting of the Bragg grating as in the above German Offenlegungsschrift DE 197 17 457 A1 Patent office described - for example by slight stretching - can be the effective Point of reflection within the grating can be significantly shifted. Through the contradirectional light guidance results in a differential runtime change that corresponds to twice the reflection point shift. Another Wavelength channel, which the mentioned first grating does not reflect, can be created by another Bragg grids attached in series can be treated in a corresponding manner. The The reflection center wavelength of the second grating depends on the center wavelength of the second channel, its reflection spectrum should be designed so that there is little with the Reflection spectrum of the first grating overlaps. Other wavelength channels can be treat accordingly. Shall different wavelength channels be in different Polarization states are broken down, so different waveguide loops can each contain only one Bragg grating intended for one wavelength channel, below Interposition of polarization controllers are cascaded. The individual loops are thereby by means of polarization components so that the non-reflective components Leave the directional coupler also at the fourth gate. In a corresponding way different loops are connected in series, for the same Wavelength channel are determined. This allows, for example, compensation realize higher-order compensations from polarization mode dispersion. For others For applications, it makes sense to add the non-reflected portions to the feed waveguide feed back. This operating mode is also due to polarization-optical elements in the Realizable loop.
Die chromatische Dispersion, die von den gechirpten Bragg-Gittern hervorgerufen wird, ist in vielen Fällen vernachlässigbar. Die Größe dieser chromatischen Dispersion entspricht i. a. derjenigen von wenigen Kilometern Standardfasern bei 1550 nm Wellenlänge. Ist keine zusätzliche chromatische Dispersion erwünscht, so kann dies durch Hintereinanderschaltung zweier annähernd identischer Schleifen geschehen, wobei an dem Gitter der zweiten Schleife keine oder eine andere reversible Änderung vorgenommen wird. Dabei ist die Anordnung so zu gestalten, das jede der beiden Eingangs-Polarisationszustände, in die das Licht zerlegt wird, auf das Gitter der ersten und das Gitter der zweiten Schleife mit bezüglich zur Gitterstruktur entgegengesetzter Ausbreitungsrichtung trifft. Dadurch heben sich die chromatischen Dispersionseffekte insgesamt auf, während weiterhin variable differentielle Laufzeiten zwischen den zwei Polarisationszuständen auftreten.The chromatic dispersion caused by the chirped Bragg gratings is in negligible in many cases. The size of this chromatic dispersion corresponds to i. a. that of a few kilometers of standard fibers at 1550 nm wavelength. Is not If additional chromatic dispersion is required, this can be done by connecting them in series two approximately identical loops occur, the second loop being on the grid no or any other reversible change is made. The arrangement is like this to shape the each of the two input polarization states into which the light decomposes with respect to the grid of the first and the grid of the second loop Lattice structure hits opposite direction of propagation. This makes them stand out overall chromatic dispersion effects, while still variable differential Transit times between the two polarization states occur.
In Abb. 1 und Abb. 2 sind zwei vorteilhafte Ausführungsbeispiele schematisch dargestellt. In Abb. 1 führt der Eingangswellenleiter 1 mehrere Wellenlängenkanäle λ1, . . ., λn, . . ., λN. Für einen Wellenlängenkanal bei λn soll eine variable differentielle Gruppenlaufzeitverzögerung zwischen zwei orthogonalen Polarisationszuständen realisiert werden. Diese ausgewählten Polarisationszustände des Kanals n werden mittels eines Polarisationsstellers 2 auf lineare x- und y-polarisierten Zustände transformiert. Diese Zustände sind so gewählt, daß sie mit den charakteristischen Zuständen des Polarisations-Richtkopplers 3 übereinstimmen. Der Polarisationsstrahlenteiler teilt das einfallende Licht in (3.1) in den linear x-polarisierten Anteil am Ausgang (3.2) und den linear y-polarisierten Anteil in (3.3) auf. Über die polarisationserhaltenden Wellenleiter (4) werden diese linearen Zustände bis zu den Viertelwellenlängen-Retardern (5) erhalten. Durch Positionierung der Achsen der Retarder unter 45° zu den x- und y-Achsen entsteht in beiden Umlaufrichtungen zirkular polarisiertes Licht. Diese beiden Wellen werden in dem Bragg-Gitter (6) reflektiert. Die beiden reflektierten Wellen werden beim nochmaligen Durchgang durch die Viertelwellenlängen- Retarder in lineare Polarisationszustände senkrecht zu denjenigen auf dem Hinweg transformiert. Das reflektierte Licht am Tor (3.2) ist somit y-polarisiert, am Tor (3.3) x- polarisiert. Beide Wellen werden aufgrund dieser Polarisationszustände von den Polarisations-Richtkoppler (3) dem vierten Tor (3.4) zugeführt. Das Gitter (6) besitzt eine linear mit dem Orte veränderliche Gitterkonstante, es ist linear "gechirpt". Durch reversible Änderungen des Gitters, z. B. durch eine leichte Dehnung, kann der effektive Reflexionspunkt für die gewählte Wellenlänge λn deutlich verschoben werden. Dadurch wird für eine der beiden x-/y-Polarisationszustände am Tor (3.1) der optische Weg bis zum Tor (3.4) länger, für den zweiten Polarisationszustand entsprechend kürzer. Somit sind, wie gewünscht, variable Laufzeitunterschiede zwischen zwei gewählten orthogonalen Polarisationszuständen des Eingangswellenleiters (1) realisiert. Wichtig für die Funktionsweise ist die polarisationsunabhängige Ausbreitung im Gitterbereich (6) oder die Ausführung als zirkular doppelbrechender Wellenleiter. Insbesondere soll dieser Bereich nicht linear doppelbrechend sein. Die Reflexionsbandbreite des Gitters ist so gewählt, daß die übrigen Kanäle nicht reflektiert sondern transmittiert werden. Die Viertelwellenlängenplatten (5) sind mit ihren schnellen Achsen um 90° verdreht zueinander ausgerichtet. Dadurch tritt für transmittiertes Licht durch die Elemente (5), (6) und (5) ohne Änderung des Polarisationszustandes hindurch und gelangt damit ebenfalls zum Tor (3.4), jedoch ohne variable Laufzeitunterschiede zwischen den Polarisationszuständen. Feste Laufzeitunterschiede können z. B. durch geeignete Orientierung der Hauptachsen der beiden Wellenleiter (4) zueinander vermieden werden. Damit wirkt die Anordnung nur auf den Kanal bei der Wellenlänge λn, die übrigen Wellenlängenkanäle werden weitgehend unverändert transmittiert.In Fig. 1 and Fig. 2, two advantageous embodiments are shown schematically. In Fig. 1, the input waveguide 1 carries a plurality of wavelength channels λ 1,. . ., λ n ,. . ., λ N. A variable differential group delay between two orthogonal polarization states is to be implemented for a wavelength channel at λ n . These selected polarization states of the channel n are transformed by means of a polarization controller 2 to linear x- and y-polarized states. These states are selected so that they match the characteristic states of the polarization directional coupler 3 . The polarization beam splitter divides the incident light in ( 3.1 ) into the linear x-polarized component at the output ( 3.2 ) and the linear y-polarized component in ( 3.3 ). These linear states up to the quarter-wavelength retarders ( 5 ) are obtained via the polarization-maintaining waveguides ( 4 ). By positioning the axes of the retarders at 45 ° to the x and y axes, circularly polarized light is produced in both directions. These two waves are reflected in the Bragg grating ( 6 ). The two reflected waves are transformed again when they pass through the quarter-wave retarders into linear polarization states perpendicular to those on the way there. The reflected light at the gate ( 3.2 ) is thus y-polarized, at the gate ( 3.3 ) x-polarized. Because of these polarization states, both waves are fed from the polarization directional coupler ( 3 ) to the fourth gate ( 3.4 ). The grid ( 6 ) has a grid constant that varies linearly with the location; it is linearly “chirped”. By reversible changes in the grid, e.g. B. by a slight stretch, the effective reflection point for the selected wavelength λ n can be significantly shifted. As a result, the optical path to the gate ( 3.4 ) is longer for one of the two x / y polarization states at the gate ( 3.1 ), and correspondingly shorter for the second polarization state. Thus, as desired, variable time differences between two selected orthogonal polarization states of the input waveguide ( 1 ) are realized. The polarization-independent propagation in the grating region ( 6 ) or the design as a circular birefringent waveguide is important for the functioning. In particular, this area should not be linear birefringent. The reflection bandwidth of the grating is chosen so that the other channels are not reflected but transmitted. The quarter-wave plates ( 5 ) are aligned with each other with their fast axes rotated by 90 °. As a result, transmitted light passes through the elements ( 5 ), ( 6 ) and ( 5 ) without changing the polarization state and thus also reaches the gate ( 3.4 ), but without variable transit time differences between the polarization states. Fixed runtime differences can e.g. B. can be avoided by suitable orientation of the main axes of the two waveguides ( 4 ) to each other. The arrangement thus acts only on the channel at the wavelength λ n , the other wavelength channels are transmitted largely unchanged.
In Abb. 2 ist die Hintereinanderschaltung zweier Anordnungen nach Abb. 1 dargestellt. Die zweite Anordnung besitzt nun ein Gitter für den Wellenlängenkanal bei λm. Dabei kann m gleich n oder m ungleich n sein. Ist m = n so kann mit einer solchen Gesamtanordnung beispielsweise eine Polarisationsmodendispersions-Kompensation zweiter Ordnung durchgeführt werden. Sind m und n verschieden, so wird durch die zweite Schleife eine differentielle Laufzeitverzögerung bei einer anderen Wellenlänge durchgeführt. In beiden Fällen befindet sich vor der zweiten Schleife ein weiterer Polarisationssteller, mit dem wiederum die gegeneinander zu verzögernden Polarisationszustände ausgewählt werden können. Ohne Zwischenschaltung eines Polarisationsstellers (2'), Ausführung des Wellenleiters (7) als polarisationserhaltenden Wellenleiter, ln = lm und ohne variable Änderung des zweiten Gitters kann die zweite Anordnung zur Kompensation der durch die erste Anordnung hervorgerufenen chromatischen Dispersion dienen. Fig. 2 shows the series connection of two arrangements according to Fig. 1. The second arrangement now has a grating for the wavelength channel at λ m . Here, m can be n or m not n. If m = n, a polarization mode dispersion compensation of the second order can be carried out with such an overall arrangement, for example. If m and n are different, the second loop executes a differential transit time delay at a different wavelength. In both cases, there is another polarization controller in front of the second loop, with which the polarization states to be retarded can be selected. Without the interposition of a polarization controller ( 2 '), implementation of the waveguide ( 7 ) as a polarization-maintaining waveguide, ln = lm and without variable change of the second grating, the second arrangement can serve to compensate for the chromatic dispersion caused by the first arrangement.
Als Einsatzgebiet für die erfindungsgemäßen variablen differentiellen Verzögerungsleitungen kommt beispielsweise die Kompensation von Polarisationsmodendispersion langer faseroptischer Übertragungsstrecken infrage.As a field of application for the variable differential delay lines according to the invention For example, the compensation of polarization mode dispersion takes longer fiber optic transmission paths in question.
Claims (17)
Priority Applications (1)
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DE1999103523 DE19903523A1 (en) | 1999-01-29 | 1999-01-29 | Delay system for an optical transmission system includes Bragg grating with variable positioning |
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DE1999103523 DE19903523A1 (en) | 1999-01-29 | 1999-01-29 | Delay system for an optical transmission system includes Bragg grating with variable positioning |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2824151A1 (en) * | 2001-04-26 | 2002-10-31 | Cit Alcatel | OPTICAL DELAY LINE |
WO2003058857A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | System for higher-order dispersion compensation including a delay line |
WO2003058855A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | Method for polarization mode dispersion compensation |
WO2003058858A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | Method for higher-order dispersion compensation |
WO2003058856A1 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | System for polarization mode dispersion compensation |
US6724972B2 (en) | 2001-12-31 | 2004-04-20 | 3M Innovative Properties Company | Silicate waveguide compositions for extended L-band and S-band amplification |
US6829409B2 (en) | 2001-12-31 | 2004-12-07 | 3M Innovative Properties Company | Method for higher-order dispersion compensation |
US7013063B2 (en) | 2001-12-31 | 2006-03-14 | 3M Innovative Properties Company | System for higher-order dispersion compensation including phase modulation |
US7016567B2 (en) | 2001-12-31 | 2006-03-21 | 3M Innovative Properties Company | System for higher-order dispersion compensation including a delay line |
US7062123B2 (en) | 2001-12-31 | 2006-06-13 | 3M Innovative Properties Company | System for higher-order dispersion compensation |
-
1999
- 1999-01-29 DE DE1999103523 patent/DE19903523A1/en not_active Withdrawn
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2824151A1 (en) * | 2001-04-26 | 2002-10-31 | Cit Alcatel | OPTICAL DELAY LINE |
WO2002088778A2 (en) * | 2001-04-26 | 2002-11-07 | Alcatel | Optical delay line |
WO2002088778A3 (en) * | 2001-04-26 | 2004-02-12 | Cit Alcatel | Optical delay line |
WO2003058856A1 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | System for polarization mode dispersion compensation |
US6724972B2 (en) | 2001-12-31 | 2004-04-20 | 3M Innovative Properties Company | Silicate waveguide compositions for extended L-band and S-band amplification |
WO2003058855A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | Method for polarization mode dispersion compensation |
WO2003058311A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | System for higher-order dispersion compensation |
WO2003058857A3 (en) * | 2001-12-31 | 2003-10-16 | 3M Innovative Properties Co | System for higher-order dispersion compensation including a delay line |
WO2003058311A3 (en) * | 2001-12-31 | 2003-10-16 | 3M Innovative Properties Co | System for higher-order dispersion compensation |
WO2003058858A3 (en) * | 2001-12-31 | 2003-11-27 | 3M Innovative Properties Co | Method for higher-order dispersion compensation |
WO2003058857A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | System for higher-order dispersion compensation including a delay line |
WO2003058855A3 (en) * | 2001-12-31 | 2004-03-25 | 3M Innovative Properties Co | Method for polarization mode dispersion compensation |
WO2003058858A2 (en) * | 2001-12-31 | 2003-07-17 | 3M Innovative Properties Company | Method for higher-order dispersion compensation |
US6748126B2 (en) | 2001-12-31 | 2004-06-08 | 3M Innovative Properties Company | System for polarization mode dispersion compensation |
US6829409B2 (en) | 2001-12-31 | 2004-12-07 | 3M Innovative Properties Company | Method for higher-order dispersion compensation |
US6907199B2 (en) | 2001-12-31 | 2005-06-14 | 3M Innovative Properties Company | Method for polarization mode dispersion compensation |
US7013063B2 (en) | 2001-12-31 | 2006-03-14 | 3M Innovative Properties Company | System for higher-order dispersion compensation including phase modulation |
US7016567B2 (en) | 2001-12-31 | 2006-03-21 | 3M Innovative Properties Company | System for higher-order dispersion compensation including a delay line |
US7062123B2 (en) | 2001-12-31 | 2006-06-13 | 3M Innovative Properties Company | System for higher-order dispersion compensation |
CN1316769C (en) * | 2001-12-31 | 2007-05-16 | 3M创新有限公司 | System for polarization mode dispersion compensation |
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