EP2172817A2 - Détection des variations d'un intervalle de temps entre des signaux optiques ou électriques - Google Patents

Détection des variations d'un intervalle de temps entre des signaux optiques ou électriques Download PDF

Info

Publication number
EP2172817A2
EP2172817A2 EP09010549A EP09010549A EP2172817A2 EP 2172817 A2 EP2172817 A2 EP 2172817A2 EP 09010549 A EP09010549 A EP 09010549A EP 09010549 A EP09010549 A EP 09010549A EP 2172817 A2 EP2172817 A2 EP 2172817A2
Authority
EP
European Patent Office
Prior art keywords
signal
optical
output
electrical
harmonic
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.)
Granted
Application number
EP09010549A
Other languages
German (de)
English (en)
Other versions
EP2172817B1 (fr
EP2172817A3 (fr
Inventor
Florian Löhl
Holger Schlarb
Frank Ludwig
Matthias Felber
Johann Zemella
Axel Winter
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.)
Deutsches Elektronen Synchrotron DESY
Original Assignee
Deutsches Elektronen Synchrotron DESY
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 Deutsches Elektronen Synchrotron DESY filed Critical Deutsches Elektronen Synchrotron DESY
Priority to SI200930532T priority Critical patent/SI2172817T1/sl
Publication of EP2172817A2 publication Critical patent/EP2172817A2/fr
Publication of EP2172817A3 publication Critical patent/EP2172817A3/fr
Application granted granted Critical
Publication of EP2172817B1 publication Critical patent/EP2172817B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F10/00—Apparatus for measuring unknown time intervals by electric means

Definitions

  • the present invention relates to a method and apparatus for detecting changes in a time interval between an optical or electrical signal and an optical or electrical reference signal. Moreover, the invention relates to a use of the method for synchronizing an optical or electrical signal with an optical or electrical reference signal.
  • a reference pulse laser is used to transmit a common optical reference signal to all components to be synchronized.
  • the reference pulse laser itself is usually synchronized with an electrical origin reference signal, which specifies, for example, a microwave oscillator.
  • the components to be synchronized with the reference pulse laser beam use either optical or electrical signals that must be synchronized with the reference optical signal of the reference pulse laser.
  • Such a component in an accelerator could be, for example, an arrival time monitor which serves to determine the arrival time of electron pulses.
  • the arrival time monitor requires an optical or electrical signal that is synchronized, for example, with the signals of other time of arrival monitors elsewhere in the accelerator. All arrival time monitors therefore use the common reference optical signal of the reference pulse laser.
  • each branch of the reference signal to a component is exposed to different external conditions, such as temperature effects, and thus the path lengths of the reference signal to the individual components are exposed to fluctuations that are not correlated with each other and interfere with the synchronization of the signals.
  • an optical signal or optical reference signal is modulated in dependence of the electrical signal or electrical reference signal.
  • the amplitude of the optical signal or of the optical reference signal is modulated in dependence on the electrical signal or electrical reference signal.
  • the time interval refers to the time span between an original optical or electrical signal and the original reference optical or electrical signal.
  • a change in this time interval is not in the form of a change in the time interval between the modulated expresses optical signal or optical reference signal, but for example only in the form of an amplitude modulation. If the signal and the reference signal, the time interval of which is to be detected, are optical, ie, optical-optical in the process mode, the modulation steps are not necessary.
  • optical signal and the optical reference signal are received with the same photodetector. This avoids differences between different photodetectors and minimizes systematic errors in the detection of the time interval. It should be noted at this point that the optical signal and the reference optical signal may have a common source and / or branches of the same optical signal.
  • the inventive method has, among other things, the advantage over known methods that it is independent of the polarization of the optical signal or of the optical reference signal and also independent of the respective pulse widths over a wide range.
  • the pulses of the signal and the pulses of the reference signal do not have to overlap in time.
  • the proposed method offers a multiplicity of possible time offsets between the optical signal and the optical reference signal which are suitable for detecting the temporal change. Thus, only insignificant additional path lengths must be inserted to ensure a suitable operating point.
  • the optical signal and / or the optical reference signal is generated by one or more mode-locked short-pulse lasers.
  • the optical signal and / or the optical reference signal are preferably periodic pulse signals having a relatively small pulse width, for example a fraction of a picosecond, compared to the period duration.
  • the period duration with a usually with 50 to 250 MHz pulse frequency operated short-pulse laser, however, is 4 to 20 nanoseconds, which corresponds to a path length of light from 1.2 to 6 meters. It is therefore a great advantage of the invention that it is not necessary to insert such long path lengths in order to ensure an overlap of the pulses with a width corresponding to a distance of the light of less than 0.3 millimeters.
  • the time interval is set to a value in the range from 0.4 to 0.6, preferably 0.45 to 0.55, of the period of the optical signal. It has been found that with a suitable choice of the harmonics a maximum sensitivity for changes can be achieved.
  • the selected harmonic is a high order harmonic, i. for example of order 5 or higher.
  • the sensitivity to changes is particularly great and a multiplicity of time intervals can serve as meaningful operating points.
  • the largest possible order to be selected is limited by the bandwidth of the photodetector and the filter width of the filter unit, since this limits the number of orders whose amplitude can still be meaningfully measured or filtered.
  • a (t) the common signal of optical signal and optical reference signal in the form of an amplitude A as a function is the time t
  • n is the harmonic order
  • a n is the amplitude of the n-order harmonic
  • f 0 is a fundamental frequency
  • ⁇ n is the phase shift of the n-th order harmonics.
  • the discrete frequency spectrum then contains the amplitudes A n of the respective frequency components as a function of the frequency nf 0 , which corresponds to the frequency of the nth order harmonics.
  • the invention is not limited to harmonics in the representation of equation (1), but may have any representation.
  • a change in the amplitude of the selected harmonic serves as a direct measure of the change in the time interval. Since the frequency spectrum depends on the time interval, the envelope changes as a function of the time interval. It is now advantageous if, for the filtering, a harmonic with a frequency is selected at which the magnitude of the gradient of the envelope of the frequency spectrum is maximal. Then the amplitude of the selected harmonic is maximally sensitive to changes in the time interval.
  • the time interval can also be set so that a harmonic desired for the selection has this property.
  • a disadvantage of this possibility is the dependence on amplitude fluctuations of the optical signal or optical reference signal. Only at very constant amplitude of the optical Signal or optical reference signal is a change in the amplitude of the selected harmonic as a direct measure of the change in the time interval. Otherwise, amplitude fluctuations of the optical signal or optical reference signal would be erroneously interpreted as a change in the time interval.
  • the difference between the amplitude of the selected harmonic and the amplitude of the second selected harmonic is largely independent of amplitude variations, since these have the same effect on both selected harmonics.
  • the second selected harmonic has an order one less than or greater than the order of the selected harmonic. It has been found that the amplitude difference of harmonics of adjacent orders, especially at a time interval close to half the period, is particularly sensitive to changes in the time interval. It has also been found that possible errors caused by the photodetector and / or the downstream electronics and / or the filter unit are particularly small for adjacent harmonics.
  • the reference harmonic and the selected filtered harmonic are preferably multiplied during mixing. If both oscillations are fed into the mixer in phase, the mixer can be used as an "amplitude detector".
  • the product of the reference harmonic and selected filtered harmonic is an output signal that oscillates at twice the frequency of a certain amplitude. For example with a low-pass filter which removes the oscillating component of the output signal, the signed amplitude change of the output signal can be extracted.
  • the change in amplitude of the output signal has a sign that depends on the direction of the change in the time interval, so that the direction of the change in the time interval can be determined from the output signal and controlled accordingly.
  • a delay device is used to delay the optical signal and / or the optical reference signal by a selected period of time.
  • a delay device may, for example, be an extension of the path of the optical signal and / or of the optical reference signal.
  • the time interval being controlled in dependence on the change in the time interval detected by the method.
  • the time interval is regulated by means of a feedback. It may be particularly advantageous to control the difference between the amplitudes of two selected adjacent order harmonics to zero.
  • an apparatus for detecting changes in a time interval between an optical or electrical signal and an optical or electrical reference signal having a photodetector, a filter unit and a meter, wherein in the case of an electrical signal and / or electrical reference signal, at least one electro-optical modulator is provided, which is designed to an optical signal or optical reference signal in dependence to modulate the electrical signal or electrical reference signal, the photodetector is configured to receive the optical signal and the optical reference signal and to output an electrical response signal at an output of the photodetector, the electrical response signal having a frequency spectrum that is a function of the time interval, the filter unit is connected to the output of the photodetector and configured to filter a selected harmonic from the frequency spectrum of the output electrical response signal, and the meter is connected to the filter unit and configured to detect changes in the time interval from changes in the amplitude of the selected harmonics.
  • the photodetector preferably has a high bandwidth, so that the frequency spectrum of the output electrical response signal comprises at least 5 harmonics.
  • the device comprises a second filter unit connected to the output of the photodetector and configured to filter a second selected harmonic from the frequency spectrum of the output electrical response signal, the measuring device being connected to the second filter unit and is adapted to changing the time interval from changes in the difference between the amplitude of the selected harmonic and the amplitude of the second selected harmonic to detect.
  • the method described above can be performed such that the detection of changes in the time interval is independent of amplitude fluctuations of the optical signal or optical reference signal.
  • At least one filter unit is integrated in the meter, i. the connection between at least one filter unit and the meter is guaranteed within the meter. It may also be advantageous if the device has a delay device that is configured to delay the optical signal and / or the optical reference signal by a selected period of time. Thus, the time interval can be set desired. Such a delay device may, for example, be an extension of the path of the optical signal and / or of the optical reference signal.
  • the device has a second photodetector, a further filter unit and a mixer, wherein the second photodetector is configured to receive the optical signal or the optical reference signal and to output a second electrical response signal at an output of the second photodetector, the second electrical response signal having a frequency spectrum, the further filter unit is connected to the output of the second photodetector and configured to filter a selected reference harmonic from the frequency spectrum of the output second electrical response signal, wherein the reference harmonic and the selected harmonic are of the same order, the mixer has a first input, a second input and an output, the first input being connected to the first input Filter unit is connected and the second input is connected to the further filter unit, and the mixer is configured to mix the reference harmonic and the selected filtered harmonic, output an output signal at the output of the mixer, and changes in the amplitude of the output signal are indicative of changes in the time interval.
  • the mixer and the further filter unit can be integrated in the measuring device. Furthermore, the measuring device may be connected via a feedback to a control unit, wherein the control unit is configured to regulate the time interval.
  • the control unit can, for example, control the repetition rate of the reference laser. This is useful, for example, if the reference laser itself is to be synchronized with an electrical reference signal of a microwave oscillator, i. the device is to perform the process in optical-electrical mode.
  • the control unit can also readjust an electrical signal which is to be synchronized with the reference optical signal of the reference laser, in which case the device should perform the method in the mode of electrical-optical.
  • Figures 1 and 2 show two schematic representations of a first and second advantageous embodiment of the invention.
  • FIG. 3 shows a schematic representation of a possible use of the invention for a length correction of the path of the signal.
  • FIG. 4 shows a schematic representation of a third embodiment of the invention.
  • Figures 5 and 6 show schematic representations of a fourth embodiment of the invention with two different uses for synchronization.
  • FIGS. 7 to 11 12 show schematic representations of optical signals and optical reference signals, respectively, as a function of time and as a function of frequency for different values of the time interval.
  • FIG. 12 shows the amplitude difference of the selected harmonic of order 44 and 45 as a function of time interval.
  • FIG. 1 shows a first preferred embodiment of the invention, wherein an optical signal 1 and an optical reference signal 3 meet a photodetector 5, the output of which is connected to a filter unit 7 in a measuring device 9.
  • the amplitudes A t of the optical signal 1 and the optical reference signal 3 are constant in time and the same size. Between the pulses of the optical signal 1 and the optical reference signal 3 is a time interval of ⁇ T.
  • the photodetector 5 now receives the optical signal 1 and the optical reference signal 3, it outputs an electrical response signal 15 at an output 13 of the photodetector 5.
  • the electrical response signal 15 has a frequency spectrum which depends on the time interval ⁇ T.
  • a selected harmonic from the frequency spectrum of the output electrical response signal 15 is filtered and its amplitude measured by the measuring device 9. It is then possible to detect changes in the measured amplitude of the selected harmonic changes in the time interval ⁇ T. For example, with temporally constant amplitude A t of the optical signal 1 and the optical reference signal 3, this is possible from changes in the measured amplitude as a direct measure.
  • the lower representation of the amplitude of the electrical response signal 15 therefore represents the discrete frequency spectrum, with the harmonics up to 46th order.
  • this embodiment of the method is less suitable since the amplitude of all harmonics A is 0 .
  • a (f) 0.5 * A 0 (1 + cos (0.01-2 ⁇ f / f 0 )) Has.
  • the harmonics of the orders 50, 150, 250, ..., etc. are extinguished respectively.
  • the envelope 17 has a period length of f 0 ⁇ T 0 / ⁇ T.
  • the sensitivity to changes in the time interval is in principle greater for harmonics of higher orders, ie at least of order 5 or higher.
  • the highest order still sensibly measurable within the bandwidth of the photodetector, for example the 46th order is most sensitive to a change in the time interval ⁇ T .
  • the envelope 17 has a minimum at this point, ie the magnitude of the gradient is zero, so that the sensitivity to changes in the time interval ⁇ T is relatively small, but it can thus be regulated to the zero point.
  • This can be metrologically advantageous.
  • the problem is, however, that a change in the amplitude by a change in the time interval ⁇ T contains no information about the direction of change in the time interval ⁇ T. So there are more tools necessary to determine the direction of change in the time interval ⁇ T.
  • FIG. 2 A second advantageous embodiment of the invention is in FIG. 2 shown, wherein the device comprises a second filter unit 19 which is connected to the measuring device 9 and integrated therein and is also connected to the output of the photodetector 5.
  • the second filter unit 19 is configured to filter a second selected harmonic from the frequency spectrum of the output electrical response signal 15.
  • the meter 9 is adapted to form the difference between the amplitude of the selected harmonic and the amplitude of the second selected harmonic, and to detect changes in the time interval ⁇ T from changes in the difference.
  • the difference ⁇ A is largely independent of fluctuations in the amplitude A t of the optical signal 1 or the optical reference signal 3, since these have the same effect on both amplitudes A 45 and A 44 and thus leave the difference ⁇ A untouched.
  • FIG. 3 shows a possible use of the invention for a length correction of the path of an optical signal 1 that requires an arrival time monitor 21 to be synchronized with other components (not shown).
  • an optical original signal 24 is generated by a mode-locked short-pulse laser 23, from which the optical signal 1 is branched off with a first semitransparent mirror 25.
  • the original signal 24 is also routed to the other components, which similarly branch off an optical signal 1 for synchronization. From the first mirror 25, the signal 1 via a light guide 27 to the arrival time monitor 21st guided. If, for example, the length of the light guide 27 changes as a result of the influence of temperature, this can impair the synchronization with other components.
  • the inventive method can be used.
  • a reference signal 3 is generated which represents a reflection by 180 ° of the signal 1.
  • the reference signal 3 thus runs in the light guide 27 to the signal 1 in the opposite direction.
  • a fourth semitransparent mirror 33 at an arbitrary position of the light guide 27 between the second 29 and third mirror 31 then branches off both the signal 1 and the reference signal 3 from a photodetector 5.
  • the reference signal 3 has then in contrast to the signal 1, the distance between the second 29 and third mirror 31, that is approximately the length of the light guide 27, pass twice before the photodetector 5 is reached.
  • the positions of the second 29 and / or the third mirror 31 can be adjusted so that the pulses of the signal 1 and the reference signal 3 having a desired time interval ⁇ T. This is preferably a distance in the range of 0.45 to 0.55 of the period T 0 of the signal 1 and the reference signal 3.
  • a connected to the output 13 of the photodetector 5 measuring device 9 can now with the inventive method, a change in the time interval ⁇ T detect. Such a change occurs when, for example, the length of the light guide 27 changes, since the reference signal 3 has passed through this twice as much as the signal 1.
  • This detected change for example, can now be carried as information to an actuator 32, which is configured to the length of the path of the light between the second 29 and third Regulate mirror 31 to compensate for the change in length of the light guide 27.
  • FIG. 4 shows a third preferred embodiment of the invention, wherein a second photodetector 33, a further filter unit 35 and a mixer 37 is used to detect changes in the time interval.
  • This may for example be advantageous when the amplitude of the selected harmonic is extinguished at the set value of the time interval ⁇ T and is to be regulated to this zero value.
  • the sign of the change in amplitude of an output signal at the mixer 37 then provides information about the direction of a change in the time interval ⁇ T.
  • a low-pass filter 49 which removes the oscillating component of the output signal
  • the signed amplitude change of the output signal can be extracted.
  • the amplitude change of the output signal then has a sign that depends on the direction of the change of the time interval, so that the direction of the change of the time interval can be determined from the output signal and controlled accordingly.
  • the second photodetector 33 is configured to receive a branched optical signal 1 and output a second electrical response signal 39 to an output 41 of the second photodetector 33.
  • the second electrical response signal 39 also has a frequency spectrum.
  • the further filter unit 35 is connected to the output 41 of the second photodetector and configured to filter a selected reference harmonic from the frequency spectrum of the output second electrical response signal 39.
  • the reference harmonic has the same order as the selected harmonic from the frequency spectrum that the first photodetector 5 outputs with the electrical response signal 15.
  • the mixer 37 has a first input 43, a second input 45 and an output 47, wherein the first input 43 is connected to the first filter unit 7 and the second input 45 is connected to the further filter unit 35.
  • the mixer 37 is adapted to mix the reference harmonic and the selected filtered harmonic output the output signal at the output 47 of the mixer 37, wherein in the signed amplitude change of the output signal a change of the time interval ⁇ T is detectable.
  • the mixer 37 and the further filter unit 35 can also be integrated in a measuring device 9.
  • FIG. 5 It is shown how the repetition rate of a short-pulse laser 23 is synchronized with an electrical reference signal of a microwave oscillator 51, that is, the method is used in the optical-electrical mode.
  • a second photodetector 33 and a further filter unit 35 are first used to filter a selected reference harmonic from a branched optical reference signal 3, which originates from the short-pulse laser 23. From the reference signal 3, the optical signal 1 is also branched off, which is passed via a delay device 53, for example in the form of an extension of the optical path.
  • the optical reference signal 3 then passes through an electro-optical modulator 55, which modulates the amplitude A t of the pulses of the reference signal 3 as a function of the electrical reference signal generated by the microwave oscillator 51 and applied to the input of the electro-optical modulator 55.
  • the optical signal 1 is then combined again with the now amplitude-modulated optical reference signal 3.
  • the delay device 53 is adjusted such that between pulses of the amplitude-modulated optical reference signal 3 and the pulses of the optical signal 1, a path difference of T 0/2 prevails. This gait difference is not to be confused with the time interval ⁇ T, which refers in this embodiment to the optical signal 1 and the reference electrical signal.
  • the first photodetector 5 thus has laser pulses at a frequency 2f 0 , of which every second pulse is amplitude-modulated as a function of the electrical reference signal.
  • the period T 0 of the reference optical signal 3 and the reference electrical signal are equal and the amplitude modulation extends as far as possible over the entire amplitude.
  • a change in the time interval ⁇ T is not due to a change in the path difference between the pulses of the optical signal 1 and the optical reference signal 3, the sensitivity to changes in the retardation should be minimized in this case.
  • a change in the path difference can be caused for example by a change in length of the path of the optical signal 1 and the optical reference signal 3. It may therefore be advantageous for these embodiments if a low order harmonic is selected to minimize, for example, the influence of changes in the length of the path of the optical signal 1 and the optical reference signal 3, respectively.
  • a mixer 37 In order to detect a change in the time interval ⁇ T from a change in a signed amplitude change of an output signal of a mixer 37 here too, a mixer 37 is provided which has a first input 43, a second input 45 and an output 47, wherein the first Input 43 is connected to the first filter unit 7 and the second input 45 is connected to the further filter unit 35.
  • the mixer 37 is adapted to mix the reference harmonic and the selected filtered harmonic output an output signal at the output 47 of the mixer 37, wherein in the signed amplitude change of the output signal a change of the time interval ⁇ T is detectable.
  • the mixer 37 and the further filter unit 35 are integrated here in a measuring device 9.
  • the output 47 of the mixer 37 is connected via a feedback 57 to a control unit 59 of the short pulse laser 23, which is adapted to control the repetition rate of the pulsed laser 23 by means of the output signal and hence to regulate the time interval ⁇ T.
  • FIG. 6 agrees except for the feedback FIG. 5 match, with the roles of the optical signal 1 and the optical reference signal 3 are reversed.
  • the optical signal 1 is synchronized with an electrical reference signal, but conversely, an electrical signal synchronized with the optical reference signal 3, that is, the method used in the mode of electrical-optical.
  • the optical reference signal 3 is branched off here from the optical signal 1 of the short-pulse laser 23, the optical signal 1 being amplitude-modulated in accordance with the electrical signal by an electro-optical modulator 55.
  • the output 47 of the mixer 37 is connected via a feedback 57 to a control unit 59 of the microwave oscillator 51, which is designed to control the phase shift of the microwave oscillator 51 by means of the signed amplitude change of the output signal and thus the time interval to regulate ⁇ T.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
EP09010549A 2008-08-22 2009-08-17 Détection des variations d'un intervalle de temps entre des signaux optiques ou électriques Not-in-force EP2172817B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200930532T SI2172817T1 (sl) 2008-08-22 2009-08-17 Odkrivanje sprememb časovnega intervala med optičnimi in električnimi signali

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008045359A DE102008045359B3 (de) 2008-08-22 2008-08-22 Detektion von Veränderungen eines Zeitabstands optischer oder elektrischer Signale

Publications (3)

Publication Number Publication Date
EP2172817A2 true EP2172817A2 (fr) 2010-04-07
EP2172817A3 EP2172817A3 (fr) 2011-03-02
EP2172817B1 EP2172817B1 (fr) 2012-12-12

Family

ID=41569898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09010549A Not-in-force EP2172817B1 (fr) 2008-08-22 2009-08-17 Détection des variations d'un intervalle de temps entre des signaux optiques ou électriques

Country Status (5)

Country Link
US (1) US8242767B2 (fr)
EP (1) EP2172817B1 (fr)
JP (1) JP5543742B2 (fr)
DE (1) DE102008045359B3 (fr)
SI (1) SI2172817T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2560250A3 (fr) * 2011-08-19 2016-02-24 Deutsches Elektronen-Synchrotron DESY Dispositif et procédé destinés à produire un signal de commande de synchronisation

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8493123B2 (en) 2010-12-15 2013-07-23 Raytheon Company Synchronization of remote clocks
US8686895B2 (en) * 2011-04-29 2014-04-01 Rosemount Tank Radar Ab Pulsed radar level gauge system with higher order harmonic regulation
JP5894849B2 (ja) 2012-04-25 2016-03-30 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 作業ロールシフト機能を具備した多段圧延機
US10050722B2 (en) * 2014-10-17 2018-08-14 The United States Of America, As Represented By The Secretary Of Commerce Signal generator, process for making and using same
US10139699B2 (en) * 2017-03-09 2018-11-27 Harris Corporation Electro-optic communications device with frequency conversion and multi-mode optical fiber and related methods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722258A (en) * 1971-03-12 1973-03-27 J Besson System for measuring time difference between and synchronizing precision clocks
EP1119119A1 (fr) * 2000-01-20 2001-07-25 Nippon Telegraph and Telephone Corporation Générateur de signal local avec PLL pour synchroniser la phase d'horloge avec une suite de signaux optiques
US20020181041A1 (en) * 2001-05-31 2002-12-05 Dennis Tong Opto-electronic phase-locked loop with microwave mixing for clock recovery

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62237344A (ja) * 1986-04-08 1987-10-17 Hamamatsu Photonics Kk 時間分解測定システム
JP3234429B2 (ja) * 1995-01-17 2001-12-04 日本電信電話株式会社 モード同期レーザの動作安定化装置
JP3681865B2 (ja) * 1997-03-31 2005-08-10 三菱電機株式会社 光パルス位置検出回路及び光パルス位置検出方法
DE19938513C2 (de) * 1999-08-13 2003-06-12 Cgk Comp Ges Konstanz Mbh Vorrichtung und Verfahren zur Synchronisierung schneller analoger Elektronik
US7157690B2 (en) * 2004-03-31 2007-01-02 Matsushita Electric Industrial Co., Ltd. Imaging device with triangular photodetector array for use in imaging
DE102005007072B4 (de) * 2005-02-16 2010-07-22 Rohde & Schwarz Gmbh & Co. Kg Verfahren zum Synchronisieren eines Meßsignals mit einem Referenzsignal und entsprechendes Meßsystem
JP2007013403A (ja) * 2005-06-29 2007-01-18 Agilent Technol Inc 時間差測定方法および同期化方法および測定方法、ならびに、時間差測定装置および同期化装置および測定装置
DE202006017713U1 (de) * 2006-11-16 2007-02-01 Deutsches Elektronen-Synchrotron Desy Strahlanalysesystem für eine Beschleunigeranlage
JP5359179B2 (ja) * 2008-10-17 2013-12-04 富士通株式会社 光受信機及び光受信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722258A (en) * 1971-03-12 1973-03-27 J Besson System for measuring time difference between and synchronizing precision clocks
EP1119119A1 (fr) * 2000-01-20 2001-07-25 Nippon Telegraph and Telephone Corporation Générateur de signal local avec PLL pour synchroniser la phase d'horloge avec une suite de signaux optiques
US20020181041A1 (en) * 2001-05-31 2002-12-05 Dennis Tong Opto-electronic phase-locked loop with microwave mixing for clock recovery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2560250A3 (fr) * 2011-08-19 2016-02-24 Deutsches Elektronen-Synchrotron DESY Dispositif et procédé destinés à produire un signal de commande de synchronisation

Also Published As

Publication number Publication date
JP2010066255A (ja) 2010-03-25
EP2172817B1 (fr) 2012-12-12
EP2172817A3 (fr) 2011-03-02
DE102008045359B3 (de) 2010-05-20
JP5543742B2 (ja) 2014-07-09
SI2172817T1 (sl) 2013-04-30
US8242767B2 (en) 2012-08-14
US20100098408A1 (en) 2010-04-22

Similar Documents

Publication Publication Date Title
EP2172817B1 (fr) Détection des variations d'un intervalle de temps entre des signaux optiques ou électriques
DE69918791T2 (de) Optischer Impulsgeber zur Erzeugung optischer Pulse mit hohem Tastverhältnis
EP2045572B1 (fr) Dispositif pour la détection de la position
DE69121490T2 (de) Schmalbandige Pulslichtquelle und Verwendung derselben in einer Spannungsdetektionsvorrichtung
EP0400197B1 (fr) Procédé et dispositif pour la démodulation du signal de la vitesse angulaire d'un gyroscope à fibre optique
DE4437575A1 (de) Spektrometer mit kohärenter und periodisch gepulster Strahlung
EP2985592A1 (fr) Spectromètre à absorption et procédé destiné à mesurer la concentration d'un composant gazeux pertinent d'un gaz de mesure
DE102009041156B4 (de) Verfahren zur Kopplung zweier gepulster Laser mit einstellbarer und von Null verschiedener Differenz der Pulsfrequenzen
DE102005035173B4 (de) Interferometer, insbesondere für die Bestimmung und Stabillisierung der relativen Phase kurzer Pulse
EP0436052B1 (fr) nnterféromètre de Sagnac à fibre optique avec rappel numérique de déphasage pour la mesure de la vitesse de rotation
EP2560250B1 (fr) Dispositif et procédé destinés à produire un signal de commande de synchronisation
DE60220431T2 (de) Verfahren zur messung der halbwellenspannung eines optischen modulators des mach-zehnder-typs
WO1993005364A1 (fr) Detecteur optique pour mouvements de rotation
EP3262727A1 (fr) Peignes de fréquences optique stabilisés
EP0483501B1 (fr) Interféromètre de sagnac à fibre optique pour la mesure de la vitesse de rotation
DE10046898A1 (de) Verfahren zum Regeln des Arbeitspunktes eines Modulators und zugehörige Ansteuereinheit
DE68914753T2 (de) Elektro-optisches Messverfahren für die Frequenzanalyse von Signalen hoher Bandbreite.
EP0113890A2 (fr) Dispositif pour mesurer la vitesse de rotation
DE10346379B4 (de) Verfahren zum Bestimmen des Frequenzgangs eines elektrooptischen Bauelements
DE102004022037A1 (de) Verfahren zum Erzeugen eines Frequenzspektrums in Form eines Frequenzkamms und Lasereinrichtung hierfür
EP1358700B1 (fr) Procede pour le controle de l'etat de regulation d'un systeme laser a frequence stabilisee et systeme laser a frequence stabilisee
DE102007007677B4 (de) Verfahren zur Frequenzstabilisierung eines Lasers mit Hilfe der akusto-optischen Modulation und eine Vorrichtung zur Frequenzstabilisierung eines Lasers mit Hilfe der akusto-optischen Modulation
DE19654740C2 (de) Meßverfahren zur Vierpolanalyse mit hoher Bandbreite
DE102018117642B4 (de) System für die wellenlängenabhängige Spektroskopie und Verfahren zum Auswerten von Messsignalen bei der wellenlängenmodulierten Spektroskopie
EP1743149A1 (fr) Dispositif et procede pour detecter un rayonnement haute frequence

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

RIC1 Information provided on ipc code assigned before grant

Ipc: G04F 10/00 20060101AFI20100301BHEP

Ipc: G04G 7/00 20060101ALI20110124BHEP

17P Request for examination filed

Effective date: 20110715

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 588589

Country of ref document: AT

Kind code of ref document: T

Effective date: 20121215

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502009005625

Country of ref document: DE

Effective date: 20130207

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: E. BLUM AND CO. AG PATENT- UND MARKENANWAELTE , CH

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130312

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130323

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20121212

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130313

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130412

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130312

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130412

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

26N No opposition filed

Effective date: 20130913

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502009005625

Country of ref document: DE

Effective date: 20130913

BERE Be: lapsed

Owner name: DEUTSCHES ELEKTRONEN-SYNCHROTRON DESY

Effective date: 20130831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121212

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20090817

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130817

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 588589

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140817

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20200724

Year of fee payment: 12

Ref country code: GB

Payment date: 20200805

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20200713

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20210816

Year of fee payment: 13

Ref country code: SI

Payment date: 20210714

Year of fee payment: 13

Ref country code: DE

Payment date: 20210706

Year of fee payment: 13

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20210817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210817

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210817

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210831

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502009005625

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220818

REG Reference to a national code

Ref country code: SI

Ref legal event code: KO00

Effective date: 20230413

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230301