DE10240211A1 - Fabry-Perot interferometer resonant frequency measurement method, which is applicable to a micro-mechanically tunable interferometer, involves measurement of the capacitance of electrodes attached to the cavity mirrors - Google Patents
Fabry-Perot interferometer resonant frequency measurement method, which is applicable to a micro-mechanically tunable interferometer, involves measurement of the capacitance of electrodes attached to the cavity mirrors Download PDFInfo
- Publication number
- DE10240211A1 DE10240211A1 DE2002140211 DE10240211A DE10240211A1 DE 10240211 A1 DE10240211 A1 DE 10240211A1 DE 2002140211 DE2002140211 DE 2002140211 DE 10240211 A DE10240211 A DE 10240211A DE 10240211 A1 DE10240211 A1 DE 10240211A1
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- Germany
- Prior art keywords
- fabry
- interferometer
- capacitance
- frequency
- tunable
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Links
- 238000005259 measurement Methods 0.000 title claims abstract description 8
- 238000000691 measurement method Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000001228 spectrum Methods 0.000 claims description 5
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 239000012528 membrane Substances 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/26—Generating the spectrum; Monochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/001—Optical devices or arrangements for the control of light using movable or deformable optical elements based on interference in an adjustable optical cavity
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
Description
Ein Fabry-Perot Interferometer besteht aus zwei sich gegenüberstehenden hoch reflektierenden Spiegeln, die einen optischen Resonator bilden und ankommendes Licht spektral filtern. Die Resonanzwellenlänge des transmittierten Lichts kann durch leichtes Andern des Spiegelabstands verschoben werden. Mikromechanisch abstimmbare Fabry-Pérot Filter wurden bereits mehrfach veröffentlicht [1–3].A Fabry-Perot interferometer exists from two facing each other highly reflective mirrors that form an optical resonator and spectrally filter incoming light. The resonance wavelength of the transmitted light can be changed by slightly changing the mirror distance be moved. Micromechanically tunable Fabry-Perot filter have already been published several times [1–3].
Die genaue Messung von Spektren optischer Signale mit Hilfe von mikromechanisch hergestellten, abstimmbaren Fabry-Pérot Filtern ist prinzipiell problematisch, da sich die Resonatorlänge aufgrund geringer Erwärmung (durch geringfügige Absorption der Signalleistung) der Spiegelmembran ungewollt ändern kann. Somit lassen sich relative Frequenz-Meßmethoden nur sehr beschränkt anwenden. Das hier vorgestellte Frequenz-Meßverfahren ist unempfindlich gegenüber thermischen Schwankungen in der Membran. Dadurch lassen sich optische Spektrumanalysatoren mit Hilfe von mikromechanisch abstimmbaren Fabry-Pérot Filtern äußerst kostengünstig herstellen.The exact measurement of spectra of optical signals with the help of micromechanically manufactured, tunable Fabry-Pérot filters is principally problematic because the resonator length changes due to little warming (by slight Absorption of the signal power) of the mirror membrane can change unintentionally. Relative frequency measurement methods can therefore only be used to a very limited extent. The frequency measurement method presented here is insensitive across from thermal fluctuations in the membrane. This allows optical Spectrum analyzers with the help of micromechanically tunable Fabry-Perot Manufacture filters extremely inexpensively.
Die beschriebene Meßmethode läßt sich auch zur absoluten, temperaturunempfindlichen Frequenzreglung von abstimmbaren optischen Komponenten, wie. z.B. Laser heranziehen.The measurement method described can also for absolute, temperature-insensitive frequency control of tunable optical components, such as. e.g. Use laser.
Das hier vorgestellte Meßverfahren beruht auf der Verwendung eines mikromechanisch hergestellten, abstimmbaren Fabry-Pérot Filters, auf dessen beiden optisch ungenutzten Spiegelflächen sich jeweils im Resonatorinneren eine Metallelektrode befindet. Es wird nun ausgenutzt, daß die Kapazität zwischen diesen Elektroden in direktem Zusammenhang mit der Resonatorlänge steht. Diese wiederum ist unmittelbar an die Resonanzfrequenz bzw. Wellenlänge des gefilterten Lichts gekoppelt. Eine Bestimmung der Kapazität des Filters gibt demnach direkt Aufschluß über die absolute Frequenz des transmittierten Signals.The measuring method presented here is based on the use of a micromechanically produced, tunable Fabry-Perot Filters, on the two optically unused mirror surfaces each there is a metal electrode inside the resonator. It is now being exploited that the capacity between these electrodes is directly related to the length of the resonator. This in turn is directly related to the resonance frequency or wavelength of the filtered light coupled. A determination of the capacity of the filter therefore gives direct information about the absolute frequency of the transmitted signal.
Die Bestimmung der Kapazität kann mit herkömmlichen Verfahren, die z.B. auf der Resonanzfrequenzmessung eines elektrischen Schwingkreises beruhen, durchgeführt werden. Der Vorteil dieses Verfahrens liegt darin, daß man eine direkte Information über die Frequenz des gefilterten Signals erhält, unabhängig davon, ob die bewegliche Filtermembran und damit die Filtertransmission sich aufgrund Temperatureinflüsse verschiebt. Eine solche Verschiebung wirkt sich auch auf die zu messende Kapazität aus. Die Zuordnung von Kapazität zu Resonanzfrequenz kann im einfachsten Fall einmal gemessen und anschließend in einer Zuordnungstabelle gespeichert werden.The capacity can be determined with usual Methods which e.g. on the resonance frequency measurement of an electrical Based on the resonant circuit become. The advantage of this method is that one direct information about receives the frequency of the filtered signal, regardless of whether the moving Filter membrane and thus the filter transmission shifts due to temperature influences. Such a shift also affects the capacity to be measured. The Allocation of capacity to resonance frequency can be measured once in the simplest case and subsequently be stored in an assignment table.
Mit Hilfe dieses Verfahrens läßt sich
nun sehr einfach ein optischer Spektrumanalysator realisieren (siehe
Patentanspruch 2). Dazu muß lediglich
das Filter kontinuierlich durchgestimmt und die entsprechende Leistung
am Ausgang des Filters über
der mit Hilfe des beschriebenen Verfahrens ermittelten Resonanzfrequenz
bzw. -wellenlänge
aufgezeichnet werden.
Dasselbe Verfahren kann nun auch
angewandt werden, um ein abstimmbares Frequenzetalon zur Stabilisierung
von abstimmbaren optischen Bauelementen zu realisieren (siehe Patentanspruch
3). Hierbei wird die Resonatorlänge
mir Hilfe der Kapazitätsmessung
so eingestellt und geregelt, daß das
Filter die gewünschte
Kapazität
und somit die gewünschte
Resonanzwellenlänge
besitzt.
Zur besseren Erläuterung der Funktionsweise
eines Fabry-Pérot
Filters ist in
VeröffentlichungenPublications
[
[2] F. Riemenschneider
et al., "Low-Cost Electrothermally Tunable Optical Microcavities
based on GaAs", accepted for publication in IEEE Photonics Technology
Letters, Nov. 2002
[3] F. Riemenschneider et al., " Electro-Thermally
Tunable Dielectric Mirror Membranes for Optical Filters and VCSELs",
accepted for publication at ECOC 2002, Kopenhagen.[
[2] F. Riemenschneider et al., "Low-Cost Electrothermally Tunable Optical Microcavities based on GaAs", accepted for publication in IEEE Photonics Technology Letters, Nov. 2002
[3] F. Riemenschneider et al., "Electro-Thermally Tunable Dielectric Mirror Membranes for Optical Filters and VCSELs", accepted for publication at ECOC 2002, Copenhagen.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002140211 DE10240211A1 (en) | 2002-08-28 | 2002-08-28 | Fabry-Perot interferometer resonant frequency measurement method, which is applicable to a micro-mechanically tunable interferometer, involves measurement of the capacitance of electrodes attached to the cavity mirrors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002140211 DE10240211A1 (en) | 2002-08-28 | 2002-08-28 | Fabry-Perot interferometer resonant frequency measurement method, which is applicable to a micro-mechanically tunable interferometer, involves measurement of the capacitance of electrodes attached to the cavity mirrors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10240211A1 true DE10240211A1 (en) | 2004-03-11 |
Family
ID=31502204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2002140211 Withdrawn DE10240211A1 (en) | 2002-08-28 | 2002-08-28 | Fabry-Perot interferometer resonant frequency measurement method, which is applicable to a micro-mechanically tunable interferometer, involves measurement of the capacitance of electrodes attached to the cavity mirrors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10240211A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020207897A1 (en) * | 2019-04-11 | 2020-10-15 | Robert Bosch Gmbh | Capacitor apparatus for an optical filter |
-
2002
- 2002-08-28 DE DE2002140211 patent/DE10240211A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020207897A1 (en) * | 2019-04-11 | 2020-10-15 | Robert Bosch Gmbh | Capacitor apparatus for an optical filter |
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8130 | Withdrawal |