WO2002054142A1 - Dispositif de controle de polarisation dans une liaison optique - Google Patents
Dispositif de controle de polarisation dans une liaison optique Download PDFInfo
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- WO2002054142A1 WO2002054142A1 PCT/FR2001/004114 FR0104114W WO02054142A1 WO 2002054142 A1 WO2002054142 A1 WO 2002054142A1 FR 0104114 W FR0104114 W FR 0104114W WO 02054142 A1 WO02054142 A1 WO 02054142A1
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- Prior art keywords
- optical
- electrodes
- polarization
- electro
- electric field
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims description 32
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000005684 electric field Effects 0.000 claims abstract description 20
- 230000010287 polarization Effects 0.000 claims description 41
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- 229910052746 lanthanum Inorganic materials 0.000 abstract 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 11
- 239000000758 substrate Substances 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 9
- 239000000835 fiber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- 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
- G02F1/03—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 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/055—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 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect the active material being a ceramic
- G02F1/0555—Operation of the cell; Circuit arrangements
-
- 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
- G02F1/0136—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 for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
-
- 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
- G02F1/13—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 based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
Definitions
- the present invention relates to a device for controlling polarization in an optical link.
- Polarization control in optical links is a priority objective for future very high-speed fiber networks implementing wavelength-division multiplexing techniques.
- a certain number of active components of the optical fiber network are sensitive to the state of polarization of the wave, in particular the fiber or semiconductor amplifiers, the switches or external modulators LiNbO 3 .
- the latter generally operate in the best conditions with a linear incident polarization of the wave and, moreover, this direction of polarization must be kept parallel to one of the electrooptic axes of the modulator.
- another very important application relates to compensation for polarization dispersion.
- Electro-optical polarization control devices are known, but these devices do not make it possible to carry out a total control of the polarization, that is to say a control of the rotation of the axes of polarization and of the birefringence for each axis direction.
- known optomechanical devices do not allow total control and their reaction time is too high.
- the subject of the present invention is a device for controlling polarization in an optical link, a device which makes it possible to control both the rotation of the polarization axes and the birefringence for each axis direction, which has a very short response time. (for example of the order of 1 to a few microseconds approximately), which is compact and causes negligible insertion losses.
- the device according to the invention comprises in the optical link whose polarization it is desired to control at least one block of electro-optical material with variable birefringence under the effect of an electric field, electrodes being arranged on at least one face of this block and being connected to a circuit making it possible to vary the electric voltages applied to these electrodes as a function of the desired rotation of the axes of polarization.
- Figures 1 and 1A are respectively a simplified perspective view of a control device according to the invention, and a diagram showing the characteristics of an optical wave polarization in the device of Figure 1;
- Figure 2 is a plan view of a first embodiment of an electro-optical unit that can be used in the device of Figure 1;
- Figures 3 and 4 are respectively a schematic front view and a schematic sectional view of the block of Figure 2, the latter showing, in a simplified manner, the path of the electric field lines inside the block;
- Figure 5 is a set of three diagrams showing, in a simplified manner, the evolution of the electric field lines in the block of Figure 2, as a function of various voltages applied to its electrodes;
- Figure 8 is a diagram showing the cascade mounting of three electro-optical blocks, according to the invention.
- Figures 9 and 10 are respectively a sectional view and a plan view of an alternative embodiment of the electro-optical unit according to the invention, with electrodes deposited on two opposite faces of the unit;
- Figure 11 is a plan view of another alternative embodiment of the electro-optical unit according to the invention, with six electrodes; and • Figures 12 to 14 are schematic sectional views of another variant of an electro-optical unit according to the invention, of “PDLC” type material.
- FIG. 1 Schematically shown in Figure 1 the essential elements of the device 1 of the invention.
- This device 1 is inserted in the path of an optical beam conveyed, in this case, by optical fibers: an optical fiber 2 through which the optical beam arrives, the polarization 2A of which is to be treated, and an optical fiber 3 through which distributes the optical beam treated 3A by the device 1.
- This device 1 essentially comprises an electro block -optics 4 and electronic circuits 5 for addressing the electrodes of block 4.
- Block 4 is a block, for example in the form of a rectangular parallelepiped of birefringent material which can compensate at any time, under the effect of an electric field, the drifts in the polarization state of the optical beam coming from the optical fiber 2.
- the changes in the polarization state of the optical beam can be very fast (variations in a few microseconds or milliseconds) and are due to variations in many parameters, in particular the temperature, the mechanical constraints imposed on the optical fibers, in the reconfiguration of the network, etc.
- the device 1, with an electro-optical unit as described below makes it possible to obtain a very short response time (of the order of 1 to a few microseconds) with respect to variations in polarization of the optical beam 2A.
- the device 1 transforms any form of polarization 2A into another form of polarization 2B.
- a form of elliptical polarization is characterized by two angles: ⁇ and ⁇ .
- the angle ⁇ is that determined by the axes Ox and OA (diagonal of the rectangle circumscribed at the ellipse).
- the device 1 independently controls the direction of the axis of the ellipse and its ellipticity, whatever the incident polarization 2A.
- F. Heismann "Analysis of a reset-free polarization controller for fast automatic polarization stabilization in fiber optic transmission Systems", Journal of Lightwave Technique, 12, 690, 1994, as well as F.
- the polarization control had to be done by association of birefringent plates whose rotation of the respective axes is controlled, which implies prohibitive response times.
- the present invention uses an electro-optical unit 4, on the electrodes of which it suffices to apply appropriate electrical voltages to control the direction of the axis and the birefringence of its material.
- This device 1 uses the free propagation of the optical beam.
- the electro-optical material constituting the block 4 is preferably a material whose coefficient of KERR has a high value (for example of the order of 10.10 m V " ).
- This material is for example a PLZT ceramic (Pb - La - Zn - TiO 2 ).
- Pb - La - Zn - TiO 2 PLZT ceramic
- a block 6 such as that shown in FIG. 2 is produced, for example.
- This block is in the form of a thin rectangular parallelepiped, the large faces of which are squares .
- four electrodes are printed or fixed, for example, identical 7 to 10. These electrodes have a “T” shape, and their “horizontal” branches delimit a square in the center of the large face.
- These electrodes 7 to 10 are respectively connected to electrical potentials V1 to V4.
- the phase blade function with rotating axis is obtained by application to the electrodes 7 to 10 of a rotating electric field (see for example: P.
- FIG. 3 shows the trace 11 of the optical beam coming from the fiber 2, and in FIG. 4 the electric field lines produced by two opposite electrodes, for example 7 and 8. In FIG. 5, three examples of electric field lines created for three different combinations of potentials applied to electrodes 7 to 10.
- these field lines are, at the center of the square delimited by the electrodes 7 to 10, substantially vertical (as seen in the drawing), substantially parallel to a diagonal of the square and substantially horizontal.
- This field thus performs the function of a phase plate whose rotation ⁇ of the axis Ox follows the rotation of the field.
- Block 6 can be called “modulator” of the polarization of the incident beam coming from fiber 2.
- the values of optical indices n x and n y along the axes Ox and Oy (see FIGS. 1A and 2) of the optical beam in the plane of incidence on block 6 are:
- - ⁇ is the angle of the axis Ox of the ellipse of the beam to be checked (or corrected) with the axis of block 6 passing through the centers of
- - d is the distance between the electrodes 7 and 8 or 9 and 10 (assumed to be arranged symmetrically with respect to the center 0, on which the incident optical beam is centered);
- - n 0 is the optical index of block 6 along Oy.
- phase modulator function of block 6 which is exercised inside the square delimited by the electrodes 7 to 10 and more particularly in the vicinity of its center, is equivalent to a phase plate with axis rotating by an angle ⁇ and with variable ⁇ birefringence.
- the axis of the phase plate thus obtained rotates at an angular speed ⁇ determined by the following relationships:
- block 6 can be produced in several different ways.
- a first embodiment consists in using a thin PLZT ceramic disc having a composition suitable for electro-optical applications.
- This ceramic has a high KERR coefficient with negligible hysteresis.
- two pairs of electrodes (7-8 and 9-10) are deposited from this ceramic (that of the input of the beam to be corrected), for example by metallic deposition under vacuum. These electrodes can be made of Au or Al for example.
- the typical response time of electro-optical ceramic devices is around 1 ⁇ s.
- the block is obtained from a polished PLZT substrate whose thickness is approximately 0.5 to 1 mm.
- methods for depositing layers of PLZT by “sol-gel” techniques or by liquid epitaxy have been developed to produce components of large dimensions (for example greater than 5 cm 2 ).
- two electro-optical functions can be realized, for example ⁇ / 2 and ⁇ / 4 blades with axes rotating on each face of the electro-optical ceramic substrate 13.
- electrodes are printed which have, for example, the same configuration as that shown in FIG. 2. These electrodes are referenced 14 as a whole on one face of the substrate 13, and 15 as a whole on the other face.
- a single mode optical fiber 16, ending with a focusing optic 17 sends an optical beam on the center of the face of the substrate 13 carrying the electrodes 14, while the beam coming from the the other face of the substrate is collected by the optics 18 (similar or identical to the optics 17) coupled to a single-mode optical fiber output 19.
- the electrodes 14 and 15 are controlled by a circuit 20 so as to constitute, for example , on the side of the electrodes 14 a ⁇ / 4 blade with a rotating axis, and on the side of the electrodes 15 a ⁇ / 2 blade with a rotating axis.
- a circuit 20 so as to constitute, for example , on the side of the electrodes 14 a ⁇ / 4 blade with a rotating axis, and on the side of the electrodes 15 a ⁇ / 2 blade with a rotating axis.
- phase plates can thus be produced.
- FIG 7 a compact variant of the device of Figure 6, this variant using components similar to those of Figure 6, and assigned the same reference numerals each followed by an "A".
- the control circuit 20A like the circuit 20, controls the two modulators comprising the electrodes 14A and 15A respectively. to achieve endless operation of the two modulators (without stop for the rotating axis).
- This device 21 receives an optical beam of an optical fiber 22 ending in a focusing optic 23 attached to a first modulator 24 which carries a set of electrodes 25.
- the modulator 24 is followed by a second focusing optic 26, a second modulator 27 carrying electrodes 28, a third focusing optic 29, a third modulator 30 carrying electrodes 31 and a fourth focusing optic 32 coupled to an output optical fiber 33.
- the modulators 24, 27 and 30 are for example of the type of the modulator of FIG. 2.
- the electrodes 25, 28 and 31 are connected to a control circuit 34.
- Each of the modulators 24, 27 and 30 acts as an electro-optical phase plate.
- Each of these blades allows an electro-optical rotation of its axes and / or an electro-optical control of its birefringence for each axis direction, to constitute an electro-optical assembly with variable birefringence and orientation.
- the control circuit 34 applies voltages to the various sets of electrodes 25, 28 and 31 making it possible, in a manner known per se, to perform the function of controlling the polarization of the incident beam.
- the material constituting the electro-optical block of the invention can be not only PLZT, but any material having a high electro-optical coefficient (coefficient of KERR). It can be, for example, a ceramic such as PbSZT, BLTN, SBN, ... or else an electro-optical polymer layer, or a liquid crystal device (but it should be noted that liquid crystals have a response time too high, much greater than a few ⁇ s), or else PDLC (“Polymer Dispersed Liquid Crystal”), described below with reference to FIGS. 12 to 14.
- FIGS. 9 and 10 show a variant of the modulator device of the invention, for which identical electrodes 35, 36 are arranged on the two faces of an electro-optical substrate 37.
- This variant is used here not to combine two phase plates ( ⁇ / 4 and ⁇ / 2 by example), but to increase the efficiency of the modulator.
- each configuration of electrodes 35, 36 is controlled by the same combination of voltages applied to these electrodes 35, 36 and has an "active thickness" (e1, e2 respectively in FIG. 9), that is to say say the thickness of electro-optical material, from the plane of the electrodes, for which the electric field created by these electrodes is effective with respect to controlling the polarization of the optical beam passing through the substrate 37.
- FIG. 11 Another variant of the device of the invention is shown in FIG. 11.
- the number of electrodes formed on one face of a substrate 38 is greater than four. In the embodiment of Figure 11, this number is six. These electrodes are referenced 39 to 44, and they are arranged regularly around the center of the face of the substrate 38, thus delimiting a hexagon. Thanks to this greater number of electrodes, one obtains, for a lower voltage applied to each electrode (lower than in the case of four electrodes), an electric field resulting, in the center of the hexagon, both more higher and more uniform.
- the complexity of the electrode control device is greater than in the case of a four-electrode configuration. Of course, one could consider having an even larger number of electrodes on the face of an electrooptical substrate, but the complexity of the electrical control device would be even greater. A compromise must therefore be sought for each application between the complexity of the control device and the efficiency of the modulator.
- the material constituting the electro-optical block of the PLZT type is replaced by a particular PDLC material, known as “nano droplets” (“nano droplets”).
- This material comprises droplets 45 of liquid crystal included in a polymer matrix 46 (FIG. 12) by a rapid polymerization process, for example under UV illumination. It is then possible to obtain drops of liquid crystal whose size is much less than 1 ⁇ m. Although the medium thus obtained is inhomogeneous and the index of the liquid crystal and of the polymer are different, the medium is not however diffusing. Indeed, the drops 45 have in the present case a size much smaller than the wavelength of the optical beam passing through the medium. Everything therefore happens as if we were in the presence of an isotropic electro-optical ceramic. The electro-optical effect, in this case, results from the reorientation, under the effect of an electric field, of the liquid crystal molecules present in the drops.
- FIG. 13 there is shown schematically some molecules of liquid crystal, which, in the absence of an electric field, are randomly oriented. When an electric voltage is applied to the electrodes 47, an electric field is created in the medium 46, and the molecules orient themselves parallel to the electric field lines 48.
- the birefringence of this PDLC device is of the order of a few 10 ⁇ 3 for voltages applied to the electrodes 46 of the order of a few tens to a hundred volts, the inter-electrode space (d) having a dimension of l 'order of 100 ⁇ m
- the response times obtained with this type of material are of the order of ten to a few tens of ⁇ s for material thicknesses of a few hundred ⁇ m.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002554778A JP2004534259A (ja) | 2000-12-28 | 2001-12-20 | 光リンク内の分極制御装置 |
US10/451,669 US20040047533A1 (en) | 2000-12-28 | 2001-12-20 | Device for contolling polarisation in an optical connection |
EP01989643A EP1356344A1 (fr) | 2000-12-28 | 2001-12-20 | Dispositif de controle de polarisation dans une liaison optique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0017226A FR2819061B1 (fr) | 2000-12-28 | 2000-12-28 | Dispositif de controle de polarisation dans une liaison optique |
FR00/17226 | 2000-12-28 |
Publications (1)
Publication Number | Publication Date |
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WO2002054142A1 true WO2002054142A1 (fr) | 2002-07-11 |
Family
ID=8858346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/004114 WO2002054142A1 (fr) | 2000-12-28 | 2001-12-20 | Dispositif de controle de polarisation dans une liaison optique |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040047533A1 (fr) |
EP (1) | EP1356344A1 (fr) |
JP (1) | JP2004534259A (fr) |
FR (1) | FR2819061B1 (fr) |
WO (1) | WO2002054142A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2833720A1 (fr) * | 2001-12-17 | 2003-06-20 | Optogone Sa | Dispositif de controle de la polarisation d'un signal vehicule sous la forme d'un faisceau lumineux, et application correspondante |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2841003B1 (fr) * | 2002-06-14 | 2004-09-24 | Thales Sa | Systeme de controle de polarisation sans butee dans une liaison optique |
FR2848684B1 (fr) * | 2002-12-17 | 2005-02-18 | Dispositif de controle dynamique de la polarisation d'une onde optique et procede de fabrication du dispositif | |
FR2860291B1 (fr) * | 2003-09-26 | 2005-11-18 | Thales Sa | Dispositif capteur de vitesse de rotation interferometrique a fibre optique |
FR2887082B1 (fr) * | 2005-06-10 | 2009-04-17 | Thales Sa | Laser a semi-conducteur a tres faible bruit |
FR2907547B1 (fr) * | 2006-10-20 | 2009-04-17 | Thales Sa | Systeme d'imagerie polarimetrique a matrice de lames d'onde programmables a base de materiau avec un tenseur electro-optique isotrope. |
FR2945348B1 (fr) | 2009-05-07 | 2011-05-13 | Thales Sa | Procede d'identification d'une scene a partir d'images polarisees multi longueurs d'onde |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2001067167A2 (fr) * | 2000-03-06 | 2001-09-13 | Corning Applied Technologies Corporation | Transformateur de polarisation |
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FR2500937B1 (fr) * | 1981-02-27 | 1983-04-15 | Thomson Csf | |
FR2501872A1 (fr) * | 1981-03-13 | 1982-09-17 | Thomson Csf | Dispositif optique d'amplification en temps reel de l'energie radiante d'un faisceau |
FR2503880A1 (fr) * | 1981-04-10 | 1982-10-15 | Thomson Csf | Valve optique a cristal liquide commandee par effet photoconducteur |
FR2506530A1 (fr) * | 1981-05-22 | 1982-11-26 | Thomson Csf | Source coherente de rayonnement generant un faisceau de direction de propagation reglable |
FR2508664B1 (fr) * | 1981-06-30 | 1985-07-19 | Thomson Csf | |
FR2509485A1 (fr) * | 1981-07-07 | 1983-01-14 | Thomson Csf | Procede holographique d'enregistrement-lecture et dispositif mettant en oeuvre ce procede |
FR2516232B1 (fr) * | 1981-11-09 | 1986-02-21 | Thomson Csf | Interferometre de type michelson a miroir photorefractif |
FR2517839A1 (fr) * | 1981-12-07 | 1983-06-10 | Thomson Csf | Dispositif de detection heterodyne d'une image optique |
FR2518766A1 (fr) * | 1981-12-18 | 1983-06-24 | Thomson Csf | Dispositif de commutation de faisceaux optiques et central telephonique comprenant un tel dispositif |
FR2519777A1 (fr) * | 1982-01-12 | 1983-07-18 | Thomson Csf | Procede de fabrication de structures de phase diffractantes |
FR2520521B1 (fr) * | 1982-01-26 | 1986-01-31 | Thomson Csf | Dispositif de cinema par holographie |
FR2527799B1 (fr) * | 1982-05-28 | 1986-05-23 | Thomson Csf | Dispositif de mise en memoire d'une image coherente dans une cavite optique multimode |
FR2536175A1 (fr) * | 1982-11-16 | 1984-05-18 | Thomson Csf | Dispositif acousto-optique d'analyse de spectre |
FR2541784B1 (fr) * | 1983-02-25 | 1986-05-16 | Thomson Csf | Dispositif de deflexion statique d'un faisceau infra-rouge |
FR2548795B1 (fr) * | 1983-07-04 | 1986-11-21 | Thomson Csf | Dispositif de commutation optique a deplacement de fluide et dispositif de composition d'une ligne de points |
FR2552565B1 (fr) * | 1983-09-23 | 1985-10-25 | Thomson Csf | Dispositif d'enregistrement d'une image coherente dans une cavite optique multimode |
FR2554596B1 (fr) * | 1983-11-04 | 1985-12-27 | Thomson Csf | Dispositif interferometrique de mesure d'une vitesse de rotation angulaire |
FR2590995B1 (fr) * | 1985-02-26 | 1988-08-19 | Thomson Csf | Dispositif d'interconnexion optique de cartes de composants electroniques dans un coffret et procede de fabrication |
FR2607941B1 (fr) * | 1986-12-09 | 1989-02-10 | Thomson Csf | Dispositif bistable optique a cristal photorefractif |
FR2608792B1 (fr) * | 1986-12-23 | 1989-03-31 | Thomson Csf | Dispositif d'amplification de signaux optiques a milieu photosensible |
FR2614136B1 (fr) * | 1987-04-14 | 1989-06-09 | Thomson Csf | Dispositif de commande optique d'une antenne a balayage |
FR2615635B1 (fr) * | 1987-05-19 | 1991-10-11 | Thomson Csf | Dispositif de controle d'un faisceau lumineux dans un grand champ angulaire et application a un dispositif de detection |
FR2622706B1 (fr) * | 1987-11-03 | 1992-01-17 | Thomson Csf | Dispositif d'interconnexion optique dynamique pour circuits integres |
JPH01320473A (ja) * | 1988-06-22 | 1989-12-26 | Anritsu Corp | 電気光学効果素子及びそれを用いた電気信号波形測定装置 |
US5317651A (en) * | 1988-06-24 | 1994-05-31 | Thomson-Csf | Non-linear and adaptive signal-processing device |
FR2640820B1 (fr) * | 1988-12-20 | 1991-02-08 | Thomson Csf | Dispositif a retard d'un signal de frequence et systeme appliquant ce dispositif |
FR2645355B1 (fr) * | 1989-03-31 | 1991-05-31 | Thomson Csf | Generateur laser de puissance avec controle de la direction d'emission du faisceau de sortie |
FR2645356B1 (fr) * | 1989-03-31 | 1991-05-31 | Thomson Csf | Cellule de deflexion pour faisceaux laser de puissance |
FR2648282B1 (fr) * | 1989-06-13 | 1991-08-30 | Thomson Csf | Laser mopa impulsionnel de puissance a structure mopa avec milieu non lineaire de transfert |
FR2650400B1 (fr) * | 1989-07-25 | 1991-10-04 | Thomson Csf | Deflecteur electro-optique a cristal liquide |
FR2655486B1 (fr) * | 1989-12-01 | 1994-08-26 | Thomson Csf | Dispositif laser a longueur d'onde elevee. |
FR2655485B1 (fr) * | 1989-12-01 | 1992-02-21 | Thomson Csf | Dispositif laser a cavite en anneau. |
FR2655435B1 (fr) * | 1989-12-01 | 1992-02-21 | Thomson Csf | Dispositif d'addition coherente de faisceaux laser. |
FR2655461B1 (fr) * | 1989-12-01 | 1992-11-27 | Thomson Csf | Source optique miniature et procede de realisation. |
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FR2669127B1 (fr) * | 1990-11-09 | 1993-01-22 | Thomson Csf | Projecteur d'images a deux faisceaux polarises par ecran matriciel. |
FR2669126B1 (fr) * | 1990-11-09 | 1993-01-22 | Thomson Csf | Systeme de visualisation d'images fournies par un modulateur spatial avec transfert d'energie. |
FR2669441B1 (fr) * | 1990-11-16 | 1993-01-22 | Thomson Csf | Dispositif de stabilisation de la reflectivite de miroirs a conjugaison de phase par diffusion brillouin stimulee a haute cadence de repetition d'impulsions. |
FR2669744B1 (fr) * | 1990-11-23 | 1994-03-25 | Thomson Csf | Dispositif d'eclairage et application a un dispositif de visualisation. |
FR2670021B1 (fr) * | 1990-12-04 | 1994-03-04 | Thomson Csf | Procede de realisation de microlentilles pour applications optiques. |
FR2674391B1 (fr) * | 1991-03-19 | 1993-06-04 | Thomson Csf | Dispositif d'intercorrelation large bande et dispositif mettant en óoeuvre ce procede. |
FR2676302B1 (fr) * | 1991-05-07 | 1993-07-16 | Thomson Csf | Procede de lecture des informations contenues dans un disque optique. |
FR2676853B1 (fr) * | 1991-05-21 | 1993-12-03 | Thomson Csf | Procede d'ecriture et de lecture optique sur support d'informations a stockage haute densite. |
FR2681988A1 (fr) * | 1991-09-27 | 1993-04-02 | Thomson Csf | Laser de puissance a deflexion. |
FR2681953B1 (fr) * | 1991-10-01 | 1993-11-05 | Thomson Csf | Correlateur de frequences. |
FR2664712B1 (fr) * | 1991-10-30 | 1994-04-15 | Thomson Csf | Dispositif de modulation optique a cellules deformables. |
FR2684198B1 (fr) * | 1991-11-22 | 1994-09-23 | Thomson Csf | Ecran pour projection d'image. |
FR2685100A1 (fr) * | 1991-12-17 | 1993-06-18 | Thomson Csf | Separateur de polarisations optique et application a un systeme de visualisation. |
FR2691549A1 (fr) * | 1992-05-22 | 1993-11-26 | Thomson Csf | Séparateur chromatique de lumière et projecteur d'image utilisant un tel séparateur. |
FR2694103B1 (fr) * | 1992-07-24 | 1994-08-26 | Thomson Csf | Projecteur d'images en couleurs. |
FR2696014B1 (fr) * | 1992-09-18 | 1994-11-04 | Thomson Csf | Miroir à conjugaison de phase. |
FR2699295B1 (fr) * | 1992-12-15 | 1995-01-06 | Thomson Csf | Dispositif de traitement optique de signaux électriques. |
FR2699289B1 (fr) * | 1992-12-15 | 1995-01-06 | Thomson Csf | Ecran de projection holographique et procédé de réalisation. |
FR2707447B1 (fr) * | 1993-07-09 | 1995-09-01 | Thomson Csf | Dispositif de visualisation couleurs. |
FR2711878B1 (fr) * | 1993-10-29 | 1995-12-15 | Thomson Csf | Dispositif de visualisation couleurs et procédé de réalisation. |
WO1995017747A1 (fr) * | 1993-12-23 | 1995-06-29 | Thomson-Csf | Procede et systeme optiques d'inscription/lecture d'information sur un support d'enregistrement |
KR100330109B1 (ko) * | 1994-06-17 | 2002-11-22 | 똥송 쎄에스에프 | 광학필터링장치및액정프로젝터 |
FR2726132B1 (fr) * | 1994-10-19 | 1996-11-15 | Thomson Csf | Dispositif d'emission mono-longueur d'onde |
EP0757848A1 (fr) * | 1995-02-24 | 1997-02-12 | Thomson Csf | Dephaseur hyperfrequence et application a une antenne reseaux |
FR2732783B1 (fr) * | 1995-04-07 | 1997-05-16 | Thomson Csf | Dispositif compact de retroprojection |
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FR2742911B1 (fr) * | 1995-12-21 | 1998-02-06 | Thomson Csf | Support d'enregistrement/lecture optique d'informations et procede d'enregistrement |
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- 2001-12-20 US US10/451,669 patent/US20040047533A1/en not_active Abandoned
- 2001-12-20 EP EP01989643A patent/EP1356344A1/fr not_active Withdrawn
- 2001-12-20 JP JP2002554778A patent/JP2004534259A/ja active Pending
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2833720A1 (fr) * | 2001-12-17 | 2003-06-20 | Optogone Sa | Dispositif de controle de la polarisation d'un signal vehicule sous la forme d'un faisceau lumineux, et application correspondante |
WO2003052496A2 (fr) * | 2001-12-17 | 2003-06-26 | Optogone | Dispositif de controle de la polarisation d'un signal vehicule sous la forme d'un faisceau lumineux, et application correspondante |
WO2003052496A3 (fr) * | 2001-12-17 | 2003-12-11 | Optogone Sa | Dispositif de controle de la polarisation d'un signal vehicule sous la forme d'un faisceau lumineux, et application correspondante |
Also Published As
Publication number | Publication date |
---|---|
US20040047533A1 (en) | 2004-03-11 |
FR2819061B1 (fr) | 2003-04-11 |
FR2819061A1 (fr) | 2002-07-05 |
JP2004534259A (ja) | 2004-11-11 |
EP1356344A1 (fr) | 2003-10-29 |
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