WO2022184855A1 - Générateur d'un signal lumineux modulé anti-effet kerr, dispositif de mesure interférométrique comportant un tel générateur et méthode de modulation d'un signal lumineux - Google Patents
Générateur d'un signal lumineux modulé anti-effet kerr, dispositif de mesure interférométrique comportant un tel générateur et méthode de modulation d'un signal lumineux Download PDFInfo
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- WO2022184855A1 WO2022184855A1 PCT/EP2022/055460 EP2022055460W WO2022184855A1 WO 2022184855 A1 WO2022184855 A1 WO 2022184855A1 EP 2022055460 W EP2022055460 W EP 2022055460W WO 2022184855 A1 WO2022184855 A1 WO 2022184855A1
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005305 interferometry Methods 0.000 title 1
- 230000000737 periodic effect Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 10
- 241000340127 Boloria sipora generator Species 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 18
- 230000005374 Kerr effect Effects 0.000 description 13
- 230000002457 bidirectional effect Effects 0.000 description 9
- 239000013307 optical fiber Substances 0.000 description 9
- 230000010363 phase shift Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000001902 propagating effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
- G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/211—Sagnac type
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/50—Phase-only modulation
Definitions
- Generator of an anti-Kerr effect modulated light signal interferometric measuring device comprising such a generator and method of modulating a light signal
- the present invention relates to the field of optics, in particular the propagation of light beams from a light source, for example a laser.
- the invention particularly relates to a generator of a modulated anti-Kerr effect light signal, an interferometric measuring device comprising such a generator and a method of modulating a light signal.
- the invention finds a particularly advantageous application in the field of measurements of physical parameters carried out using in particular a Sagnac interferometer.
- the invention applies to the production of an optical fiber gyroscope.
- Figure 1 illustrates a fiber optic gyrometer la which conventionally comprises:
- Sagnac interferometer 3a in which propagate a first light signal and a second mutually counter-propagating light signal, said Sagnac interferometer 3a comprising
- an optical splitter 6a connected, on the one hand to said input port 4a and, on the other hand, to a first arm 7a and to a second arm 8a of said Sagnac interferometer 3a,
- an optical fiber loop 9a a first end of which is coupled to the first arm 7a and a second end is coupled to the second arm 8a, configured so that a rotation of the gyrometer la in the plane of FIG. 1 generates a phase shift between the signals counter-propagating propagating in the loop 9a,
- the input/output port 4a transmitting, in a return direction 10a opposite to the forward direction 5a, an output light signal having an output light power which is a function of the phase shift between the two counter-propagating signals, - a photodetector 11a, configured to receive the output signal and to deliver an electrical signal representative of the output light power, and
- An optical coupler 12a which couples, in the forward direction 5a, the light signal generator 2a to said input/output port 4a and, in the return direction 10a, the input/output port to the photodetector 11a.
- Such an interferometric measuring device la can for example be used in an interferometric fiber optic gyroscope (“Interferometric Fiber-Optic Gyroscope” or “l-FOG”), the physical parameter to be measured being in this case a spin.
- Interferometric Fiber-Optic Gyroscope or “l-FOG”
- the light signal generator comprises a light source which emits a light signal whose spectral band extends over a width conventionally comprised between a few nanometers and a few tens of nanometers.
- the source is conventionally a so-called ASE (“Amplified Spontaneous Emission”) source or else a so-called SLED (“Superluminescent Light Emitting Diode”) source.
- Single-frequency sources otherwise known as single-mode sources, such as laser diodes, in particular DFB (“Distributed Feed-Back”) type diodes, make it possible to solve the drawbacks of wide-spectrum sources.
- DFB Distributed Feed-Back
- Single-frequency sources make it possible to solve the drawbacks of wide-spectrum sources.
- DFB Distributed Feed-Back
- the Kerr effect designates an electro-optic phenomenon of birefringence, that is to say a variation in the refractive index of a material under the effect of an electric field.
- this electric field is generated by the electric fields of the counter-propagating signals and each of the counter-propagating beams therefore undergoes a self-induced Kerr effect and a Kerr effect induced by the other counter-propagating signal.
- the Kerr effect generates an Acpk phase shift between the two counter-propagating signals, which the measurement means of the gyrometer, here the photodetector 11a, are not capable of distinguishing from the Acpr phase shift generated by rotation.
- the Kerr effect therefore falsifies the result of the measurement of the rotation.
- the factor e is a quantity characteristic of the optical fiber, representative of the variation in refractive index induced by the counter-propagating signals. In a silica optical fiber, this factor depends on the dielectric susceptibility of the silica c b and is approximately equal to 2 ⁇ 10 15 pW -1 . This characteristic quantity is particularly detailed in the work “The fiber-optic gyroscope”, H. C . Lefsky, Artech House, Second Edition, 2014, Chapter 7.3.
- the factor a is a constant close to 2 or equal to 2, for example between 1.6 and 2.4, the value of which is specific to a gyrometer structure.
- This value is determined by calibration by carrying out a reference measurement, for example a measurement of the rotational speed of the earth by positioning the gyrometer in two opposite orientations so as to find the Kerr value by summing the two results, and by adjusting - in the source electronics - the value of a which cancels this residue.
- a reference measurement for example a measurement of the rotational speed of the earth by positioning the gyrometer in two opposite orientations so as to find the Kerr value by summing the two results, and by adjusting - in the source electronics - the value of a which cancels this residue.
- phase shift Acpk induced by the Kerr effect is zero when the ratio between the power at the measurement point P Mes and the average output power ⁇ P> is equal to the factor a.
- the present invention provides a solution to the aforementioned problems
- a generator of an anti-Kerr modulated light signal comprising a primary light source having four longitudinal modes or less and configured to generate a light signal, and means for modulating the light signal configured to modulate the power of the light signal by a square or square type control signal whose duty cycle is less than or equal to 50% and which are adapted so that the modulated light signal is periodic and has:
- the light signal generator supplies a modulated signal which can be transmitted in a Sagnac interference device, in particular an optical fiber gyroscope, without generating a Kerr effect or by generating a greatly reduced Kerr effect.
- control signal has a duty cycle strictly less than 50%.
- the primary light source can be a laser diode.
- a laser diode advantageously has low power consumption, low production cost, reduced surface space, a satisfactory scale factor due to the wavelength stability and a moderate thermal rise in operation.
- RIN Relative Intensity Noise
- the gain is equal to 2.
- the gain is a good estimate of the value of the factor a.
- the gain is chosen to be equal to the factor a.
- the modulating means comprise means for adjusting the second power value of the light signal.
- the modulating means comprise means for adjusting the duty cycle of the control signal.
- the means for adjusting the second power value and/or the duty cycle make it possible to adjust the modulation optimally according to the application envisaged.
- the first power value is the maximum value of the power of the modulated light signal.
- the second power value is the minimum power value of the modulated light signal.
- the generator comprises a servo loop delivering a servo signal representative of the difference between the first value and the average power of the modulated light signal multiplied by the gain, the modulation means being controlled by the servo signal.
- a control loop advantageously makes it possible to dispense with manual adjustment of the generator. Additionally, modulation accuracy is improved since the feedback loop allows for dynamic modulation adjustment.
- the servo loop comprises a photodetector configured to receive at least part of the modulated light signal and to deliver a first signal representative of the power of the light signal, a first filter configured to deliver a second signal equal to the average value of the first signal multiplied by the gain, a second filter configured to deliver a third signal equal to the first value, a servo module configured to compare the second signal and the third signal and to deliver the signal d servo-control representative of the difference between the second signal and the third signal.
- the primary light source comprises an integrated photodetector.
- the generator thus gains in compactness, compared to a generator comprising a separate photodetector from the primary light source.
- the modulating means are suitable for modulating the power supply of the primary light source.
- the modulation means comprise an optical modulator located downstream of the primary light source.
- a method is proposed for modulating a light signal emitted by a primary light source having four longitudinal modes or less, comprising a step of modulating the light signal by a control signal of the square or slot type. whose duty cycle is less than or equal to 50% so that the modulated light signal is periodic and presents:
- the duty cycle of the control signal is strictly less than 50%.
- the gain is equal to 2.
- the modulation step includes an adjustment of the second power value of the light signal.
- the modulation step includes an adjustment of the value of the duty cycle of the light signal.
- the modulation step includes servo-control of the modulation by a servo-control signal representative of the difference between the first value and the mean power of the light signal multiplied by the gain.
- the modulation step includes modulation of the power supply of the primary light source.
- the modulation step comprises optical modulation of the light signal emitted by the primary light source.
- the method includes servo-control of the modulation by an external synchronization signal.
- an interferometric measuring device comprising a modulated light signal generator according to the invention.
- the interferometric measuring device is an optical fiber gyroscope.
- the different characteristics, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or exclusive of each other.
- Figure 1 illustrates a conventional architecture of a fiber optic gyroscope
- FIG. 2 is a functional diagram illustrating a modulated light signal generator according to one embodiment of the invention
- FIG. 3 is a timing diagram illustrating the output power of the modulated light signal from a generator according to the invention as well as the value of the modulation control signal,
- FIG. 4 illustrates an alternative embodiment of the light signal generator according to the invention, in which the generator comprises a control loop for the minimum power of the light signal,
- FIG. 5 illustrates an alternative embodiment of the light signal generator according to the invention, in which the generator comprises a duty cycle feedback loop,
- FIG. 6 illustrates an alternative embodiment of the light signal generator according to the invention, in which the generator comprises an optical modulator.
- FIG. 7 illustrates a fiber optic gyroscope comprising a modulated light signal generator according to the invention
- the modulated light signal generator 1 illustrated in FIG. 2 comprises a primary light source 2 configured to generate a light signal having a single longitudinal mode.
- the primary source 2 is here powered by a current source 3 and delivers a light signal Smod modulated by modulation means 4, or modulation circuit, so as to present a first power value, or high value, and a second value of power, or low value.
- the primary light source 2 is an integrated laser diode of the DFB type, conventionally comprising a PN junction, a waveguide and an optical resonance cavity comprising a Bragg grating.
- a DFB type diode is configured to deliver a monofrequency light signal.
- the current source 3 here comprises a voltage supply module 7 delivering, at an intermediate supply terminal 8, an intermediate voltage and a voltage-current conversion circuit 9 delivering, at the level of a main supply terminal 10, the supply current le to the primary light source 2.
- the voltage supply module 7 comprises a first supply terminal 11 configured to deliver a first supply voltage VI, for example here 3 volts, a second supply terminal 12 configured to deliver a second supply voltage supply V2, which can take here for example any value between 0 and 1 volt, and a bidirectional switch 13 coupled between the two supply terminals 11, 12 and the intermediate terminal 8.
- the bidirectional switch 13 is configured to be either in a first configuration in which the current-voltage conversion circuit 9 is coupled to the first supply terminal 11, or in a second configuration in which the conversion circuit 9 is coupled to the second supply terminal 12.
- the bidirectional switch 13 is here a semiconductor integrated circuit.
- the bidirectional switch 13 is electrically controlled by a control signal 50, or modulation control signal.
- the modulation means 4 are here configured to adjust the parameters of the modulation, that is to say here the value of the second supply voltage V2 and therefore the second power value, and are configured to adjust the duty cycle by controlling the bidirectional switch 13.
- the modulation means 4 are here configured to deliver the control signal 50, which here controls the bidirectional switch 13 and which is a square signal which can be either in a high state or in a low state.
- the modulation means 4 comprise a communication interface 60, for example a connector or a terminal block, making it possible to receive the control signal 50 from the outside, for example from centralized control means MC of an interferometer to which the light signal generator 1 is coupled.
- the gyrometer control means MC are configured to deliver the first control signal 50 having here a fixed duty cycle of less than 50%, for example 47%.
- the bidirectional switch 13 is configured to be in its first configuration when the control signal 50 is in the high state and in its second configuration when the control signal 50 is in the low state.
- the modulation means 4 comprise means 61 for adjusting the value of the second supply voltage V2.
- the adjustment means 61 comprise a mechanically adjustable potentiometer so as to adjust the value of the second supply voltage between 0 volt and 1 volt.
- the action of adjustment means 61 on second voltage V2 is symbolized by an arrow referenced 51.
- control signal 50 modulates the value of the intensity of the supply current Ie and therefore the value of the power of the signal modulated light Smod emitted by the primary light source 2.
- the modulated light signal Smod emitted by the primary light source 2 therefore has the first power value, for example here equal to 2 mW, when the primary light source is supplied by the first voltage VI, and the second value of power lower than the first power value when the primary light source 2 is powered by the second voltage V2.
- the second power value is adjustable by adjusting the second voltage V 2. Since neither of the two voltages VI and V 2 is zero, neither of the two power values of the modulated signal is zero and the modulated light signal Smod does not present any extinction.
- the transfer functions of the current source B and the primary light source 2 are such that the modulated light signal Smod is distorted and does not have a duty cycle identical to that of the control signal 50.
- the modulated signal Smod is deformed so that it is not a square signal; it is therefore difficult to determine a duty cycle.
- the generator 1 further comprises a photodetector 24 configured to receive part of the modulated light signal Smod and to deliver a measurement signal Sm representative of the power of the modulated light signal Smod.
- the photodetector is an integrated photodiode.
- the photodetector 24 is integrated into the bottom of the cavity of the laser diode and receives all the power of the light signal emitted on this side.
- the photodetector can be located outside the laser diode 2, downstream of the laser diode 2 relative to the direction of propagation of the light signal so as to receive part of the optical power of the light signal, for example 5 %.
- the second power value can therefore be adjusted here, in particular as a function of the value of the measurement signal and of operations carried out thereon.
- FIG. 3 is a timing diagram representing the evolution of the value of the control signal 50 and of the value of the power of the modulated light signal Smod delivered by the light signal generator 1, or output power Ps.
- control 50 is here a square signal having a duty cycle of 47%.
- the modulated light signal Smod is here substantially deformed with respect to the control signal 50. This deformation is in particular due to the architecture of the light signal generator 1, the materials used and the conditions under which the generation of the modulated signal Smod is implemented.
- the modulated light signal Smod does not exhibit any extinction or, in other words, exhibits a non-zero low (or minimum) state.
- the average power ⁇ P> of the signal Smod is equal to 1 mW.
- the light signal generator 1 therefore advantageously makes it possible to reduce the Kerr effect.
- the light signal generator 1 comprises a servo loop comprising a servo module 15 configured to deliver a servo signal Sas making it possible to adjust the value of the second supply voltage V2.
- the servo module 15 is here configured to deliver a servo signal Sas representative of the integration of the difference between the power of the modulated signal Smod having the first power value and the average value of the modulated light signal Smod multiplied by the gain, here equal to 2.
- the adjustment means 61 comprise an analog potentiometer controlled by the servo signal Sas and are configured to slave the value of the second supply voltage V2 to the cancellation of the difference between the power of the signal modulated Smod presenting the first power value and the average value of the modulated light signal Smod multiplied by the gain.
- the servo module 15 comprises a first branch 16 and a second branch 17 each configured to receive a first signal, here the measurement signal Sm.
- the servo module 15 further comprises a subtractor 18 comprising a first input coupled to the first branch 16, a second input coupled to the second branch 17 and an integrator 19.
- the first branch 16 is configured to perform operations on the measurement signal Sm so as to deliver to the first input of the subtractor 18 a second signal
- the first branch comprises a low-pass filter 20 and an amplifier 21 having the gain, coupled in series between photodetector 24 and subtractor 18.
- the second branch 17 is configured to perform an operation on the measurement signal Sm so as to deliver to the second input of the subtractor 18 a third signal
- the second branch 17 comprises a peak detector 22 which conventionally comprises a resistive-capacitive circuit and at least one diode.
- the subtractor 18 is here configured to establish the difference of the values of the signals S2, S3 coming from the first and second branches 16, 17 and to deliver a fourth signal S4 representative of this this difference.
- the subtractor 18 comprises a differential amplifier.
- the fourth signal S4 is transmitted to the integrator 19 which integrates the fourth signal S4 so as to generate the control signal Sas controlling the value of the second supply voltage V2.
- the servo module 15 it would be possible for the servo module 15 to be configured to slave the value of the duty cycle of the control signal 50, the value of the second supply voltage V2 being constant or manually adjustable.
- the modulation means 4 comprise a duty cycle adjustment module 62, coupled between the communication interface 60 and the bidirectional switch 13, controlled by the servo signal Sas and configured to adjust the duty cycle of control signal 50 and to output an adjusted control signal.
- the adjustment module 62 comprises an RC circuit, an adder and a Schmitt trigger.
- the adjustment module 62 is not slaved but makes it possible to manually adjust the value of the duty cycle.
- the adjustment module includes a potentiometer.
- the light signal generator 1 does not include electronic modulation means, but optical modulation means 25 located downstream of the primary light source 2 relative to the direction of propagation of the light signal emitted by the source 2.
- the optical modulation means 25 here comprise an optical intensity modulator configured to modulate the light signal generated by the primary light source 2 so as to produce the modulated light signal Smod.
- the optical modulator 25 is a Mach Zehnder type modulator. It is right to note that in this embodiment, the photodetector 24 is not integrated into the cavity of the laser diode 2 but produced by a separate component. For example, 5% of the power of the modulated light signal Smod is here directed to the photodetector 24.
- the current source B here does not include a bidirectional switch and the current supplied is of constant value.
- the intermediate supply terminal 8 is configured to deliver the first supply voltage VI.
- the servo signal Sas is transmitted to the control means which are in this example adapted to adjust the duty cycle and/or the second power value of the light signal.
- FIG. 7 illustrates an interferometric measuring device lb, here an optical fiber gyrometer, comprising
- Sagnac 3b interfera meter in which propagate a first counter-propagating light signal and a second light signal, said Sagnac 3b interfera meter comprising
- an optical splitter 6b connected, on the one hand to said input port 4b and, on the other hand, to a first arm 7b and to a second arm 8b of said Sagnac interference meter,
- the input/output port 4b transmitting, in a return direction 10b opposite to the forward direction 5b, an output light signal having an output light power which is a function of the phase difference between the two counter-propagating signals,
- a photodetector 11b configured to receive said output light power and to deliver an electrical signal representative of the output light power
- an optical coupler 12b which couples, in the forward direction 5b, the light source to said input/output port 4b, and in said return direction, the input/output port 4b to the photodetector 11b, a light signal generator 2b according to the invention
- the control means MC in particular configured to deliver a control signal Sx acting here as a synchronization signal, the characteristics of which are calculated by the control means MC as a function in particular of the circulation time of the light in the sensor 9b.
- the control means MC are also configured to carry out, in a synchronized manner, phase and power modulation operations of the light signals circulating in the gyrometer 1b, in particular at the level of the optical separator 6b.
- a generator has previously been described comprising a primary light source which is a DFB type laser diode.
- the invention is compatible with any type of light source having a number of modes less than four.
- the invention is compatible with a single-frequency light source or whose operation is similar to single-frequency operation.
- laser diodes of the Fabry Pérot type which emit on very few modes while leaving much less powerful secondary modes, are compatible with the invention.
- control signal 50 the value of 47% of the duty cycle of the control signal 50 described previously is not limiting, the control signal being able to present any duty cycle less than or equal to 50%.
- the maximum power of the modulated light signal Smod can preferably take any value between 0.5 mW and 20 mW, depending on the configuration of the primary light source and the value of the first supply voltage VI.
- the minimum power depends on the value of the maximum power and on the duty cycle, and is then obtained by adjusting the second supply voltage in accordance with what has been described previously.
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- Nonlinear Science (AREA)
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US18/548,842 US20240159537A1 (en) | 2021-03-04 | 2022-03-03 | Generator for generating an anti-kerr-effect modulated light signal, interferometry measuring device comprising such a generator, and method for modulating a light signal |
EP22713554.8A EP4302051A1 (fr) | 2021-03-04 | 2022-03-03 | Générateur d'un signal lumineux modulé anti-effet kerr, dispositif de mesure interférométrique comportant un tel générateur et méthode de modulation d'un signal lumineux |
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FRFR2102118 | 2021-03-04 | ||
FR2102118A FR3120453B1 (fr) | 2021-03-04 | 2021-03-04 | Générateur d’un signal lumineux modulé anti-effet Kerr, dispositif de mesure interférométrique comportant un tel générateur et méthode de modulation d’un signal lumineux |
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US (1) | US20240159537A1 (fr) |
EP (1) | EP4302051A1 (fr) |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983004305A1 (fr) * | 1982-05-25 | 1983-12-08 | The Board Of Trustees Of The Leland Stanford Junio | Interferometre avec compensation de l'effet de kerr |
US4773759A (en) * | 1984-01-23 | 1988-09-27 | The Board Of Trustees Of The Leland Stanford Junior University | Interferometer with Kerr effect compensation |
FR2660996A1 (fr) * | 1990-04-17 | 1991-10-18 | Photonetics | Dispositif de mesure a fibre optique, gyrometre, centrale de navigation et de stabilisation, capteur de courant. |
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2021
- 2021-03-04 FR FR2102118A patent/FR3120453B1/fr active Active
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2022
- 2022-03-03 WO PCT/EP2022/055460 patent/WO2022184855A1/fr active Application Filing
- 2022-03-03 EP EP22713554.8A patent/EP4302051A1/fr active Pending
- 2022-03-03 US US18/548,842 patent/US20240159537A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983004305A1 (fr) * | 1982-05-25 | 1983-12-08 | The Board Of Trustees Of The Leland Stanford Junio | Interferometre avec compensation de l'effet de kerr |
US4773759A (en) * | 1984-01-23 | 1988-09-27 | The Board Of Trustees Of The Leland Stanford Junior University | Interferometer with Kerr effect compensation |
US4773759B1 (en) * | 1984-01-23 | 1996-08-06 | Univ Leland Stanford Junior | Interferometer with Kerr effect compensation |
FR2660996A1 (fr) * | 1990-04-17 | 1991-10-18 | Photonetics | Dispositif de mesure a fibre optique, gyrometre, centrale de navigation et de stabilisation, capteur de courant. |
Non-Patent Citations (2)
Title |
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H. C. LEFÈVREARTECH HOUSE: "The fiber-optic gyroscope", 2014 |
HONTHAAS JOACHIN ET AL: "Interferometric filtering of the excess relative intensity noise of the broadband source of a fiber optic gyroscope", PROCEEDINGS OF SPIE, IEEE, US, vol. 9157, 22 May 2014 (2014-05-22), pages 91572D - 91572D, XP060041359, ISBN: 978-1-62841-730-2, DOI: 10.1117/12.2059578 * |
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US20240159537A1 (en) | 2024-05-16 |
EP4302051A1 (fr) | 2024-01-10 |
FR3120453B1 (fr) | 2023-04-21 |
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