CN2627539Y - Digitalized electromagnetic driving adjustable optical attenuator - Google Patents
Digitalized electromagnetic driving adjustable optical attenuator Download PDFInfo
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- CN2627539Y CN2627539Y CNU032323247U CN03232324U CN2627539Y CN 2627539 Y CN2627539 Y CN 2627539Y CN U032323247 U CNU032323247 U CN U032323247U CN 03232324 U CN03232324 U CN 03232324U CN 2627539 Y CN2627539 Y CN 2627539Y
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- 230000003287 optical effect Effects 0.000 title claims abstract description 65
- 238000006073 displacement reaction Methods 0.000 claims abstract description 29
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- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000004888 barrier function Effects 0.000 claims description 30
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000000919 ceramic Substances 0.000 claims description 14
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 6
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Abstract
The utility model discloses a digitalized electromagnetic-driving tunable optical attenuator, which comprises two output/input fiber collimators aligned with each other through a coupling optical path and fixed on a substrate, wherein a light shield sheet connected with an elastic sheet is equipped between the two collimators; the tail ends of the collimators forms point-contact with an eccentric wheel; the plane where the light shield sheet is arranged penetrates through the center of a rotation shaft; a gear is arranged coaxially with the eccentric wheel to rotate around the rotation shaft; a rack engaged with the gear is arranged on a lateral elastic sheet, which is connected with a horizontal elastic sheet; and the lateral and horizontal elastic sheets are respectively connected with displacement drivers arranged on the substrate. According to the utility model, the displacement drivers drive a gear/rack engagement mechanism to rotate the eccentric wheel such that the light shield moves to adjust the light attenuation, thereby achieving digitalized electro-control adjustment of light attenuation coefficient. Each components of the utility model can be easily processed, which facilitates the achievement of automatic and cost-effective mass production.
Description
Technical field
The utility model relates to adjustable optical attenuator, especially a kind of digitizing Electromagnetic Drive adjustable optical attenuator.
Background technology
Optical attenuator (0ptical Attenuator) is one of optical passive component important in the modern optical transmission network, and its major function is the optical signal power of decay by device, obtains the luminous power output of user's appointment.In optical transmission process, the luminous power of transmission connects the quantity of number of times, used optics owing to the transmission range of optical fiber, optical fiber and the difference of performance has nothing in common with each other.For various optical transmission system, the luminous power requirement because of the different input and output of characteristic separately when the light exchange takes place between them also has nothing in common with each other.Therefore when the luminous power of transmission system light-receiving/output is excessive, then need optical attenuator to regulate.Along with the development of optical transport technology, the especially development of wavelength-division multiplex (Wave Division Multiplexing) optical-fiber network, optical attenuator is with a wide range of applications.These application comprise aspects such as assessment, research and adjustment, the correction of optical transmission line, system, for example: EDFA control, dwdm system transmitter or the modulation of receiver signal level, the modulation of OADM level or carrier frequency channel break.
Optical attenuator can be divided into fixed optical attenuator (Fixed Optical Attenuator) and adjustable optical attenuator (Variable Optical Attenuator) according to its function.Wherein, adjustable optical attenuator (VOA) can be divided into again, manually adjustable optical attenuator and electric-controlled adjustable optical attenuator two classes.Wherein, though manually adjustable optical attenuator has easy realization and lower-cost advantage, operating difficulties, and be difficult for reaching high attenuation accuracy.In contrast, the electric-controlled adjustable optical attenuator precision is higher, and is easy to operate, and can be used as relatively independent functional module and be embedded in the middle of the equipment and use, and is fit to the test and the maintenance of optical transmission device, thereby is subjected to the extensive welcome in market, has very big development prospect.
A kind of existing electric-controlled adjustable optical attenuator adopts solenoid and spring to cause the horizontal dislocation (with reference to Figure 11 (b)) of two optical fiber, regulates attenuated optical signal.But because fibre diameter generally is about 125 μ m, the order of magnitude of transversal displacement parameter is all at micron order under normal conditions, and moving of optical fiber will be difficult to accurate control, and two sections difficult alignings of optical fiber are brought very big inconvenience to operation; Fiber core is polluted easily, causes attenuation accuracy to reduce; Moving fiber can't realize that device is stabilized in the function at different damping capacity places in this way; Moving fiber in this way, between the light decrement of device and the optical fiber dislocation amount the two have nonlinear relation (with reference to Figure 10), and this nonlinear relationship can't be carried out the correction of linearity in this design.
Another kind of existing electric-controlled adjustable optical attenuator adopts stepper motor to drive " worm screw-gear-screw rod " structure (with reference to Figure 11 (a)), regulates the horizontal dislocation between two optical fiber collimators, realizes the decay to light signal.In this structure, the step-length of two optical fiber collimator generation dislocations is decided by the pitch of screw mandrel.Also there is shortcoming in this structure, at first is the restriction that the step-length (resolution) of its attenuation change is subjected to screw mandrel, can't obtain higher attenuation accuracy.Next is a moving fiber in this way, still can't proofread and correct the nonlinear relationship between light decrement and the dislocation amount.Owing to used stepper motor, make structure huge simultaneously, cost is higher.
Generally speaking, the optical attenuator of this two kinds of optical fiber (optical fiber collimator) dislocation type all exists the optical attenuation precision not high, the shortcoming that the nonlinear effect of while light decrement can't be proofreaied and correct.
Another existing electric-controlled adjustable optical attenuator is shown in Figure 11 (c), the optical fiber collimator 31,32 of two parallel placements is adopted in this design, the front end of two collimating apparatuss is respectively put the small mirror 30,33 at a slice and collimating apparatus optical axis angle at 45, drive a gradual change light absorption density optical filter 34 with stepper motor and lead screw device 29 and on the vertical direction of light path between two small mirrors, move, change the light decrement of system.Though used gradual change light absorption density optical filter, helped the nonlinear relationship between calibrated filter displacement and the light decrement.Yet general gradual change light absorption density optical filter is the plated film type mostly, and its good performance is had relatively high expectations to coating technique, at present domesticly still can't accomplish.Owing to the dependence of gradual change light absorption density optical filter, make that the attenuator service band is narrow, polarization mode dispersion is big, and adopt the optical filter of this structure may cause bigger return loss again light signal.The drives structure of this design has adopted stepper motor, make that not only whole apparatus structure is huge, and cost is higher.
Summary of the invention
The purpose of this utility model is to provide a kind of digitizing Electromagnetic Drive adjustable optical attenuator, can carry out linearity correction to light barrier stroke and light decrement non-linear, can carry out digitizing to light decrement and regulate, realize the Electromagnetically driven micromechanical formula variable optical attenuator of producing in batches.
In order to achieve the above object, the technical solution adopted in the utility model is as follows: comprise that two input-output optical fiber collimating apparatuss of aiming at through coupling optical path are fixed on the substrate, in the middle of two input-output optical fiber collimating apparatuss the light barrier that is connected with flexure strip is set, the flexure strip of light barrier tail end is put with the eccentric wheel one-tenth on being contained in rotating shaft and is contacted, and the axle center of rotating shaft is passed on plane, light barrier place, gear and eccentric wheel are coaxial to be mounted and fixed on together, rotate around the rotating shaft that is vertically fixed on the substrate, the tooth bar that is meshed with gear is contained on the transverse elasticity sheet, the transverse elasticity sheet is connected with the longitudinal elasticity sheet, transverse elasticity sheet and longitudinal elasticity sheet respectively be contained in substrate on separately displacement driver be connected.
Said displacement driver: comprise that first, second iron nickel thin slice that is connected with the longitudinal elasticity sheet with the transverse elasticity sheet is connected to an end of U sections core separately respectively by first, second elasticity of flexure body, be wound with coil on the other end of U sections core, iron nickel thin slice maintains a minim gap with U sections core two ends respectively and constitutes magnetic loop.
Said displacement driver: comprise respectively that several pieces that be connected with the longitudinal elasticity sheet with the transverse elasticity sheet are mechanically connected, the sticking repeatedly heap of the piezoelectric ceramics that comes that happens frequently of piezoelectric ceramic piece in parallel on the circuit.
Said displacement driver: comprise respectively that with two ends, the left and right sides that the transverse elasticity sheet is connected with the longitudinal elasticity sheet the staggered comb of the two rows plate structure that maintains an equal level is arranged respectively, make semi-girder, make whole movable broach flat board be suspended on static comb on the substrate by flexure strip.
Said displacement driver: comprise that respectively what be connected with the longitudinal elasticity sheet with the transverse elasticity sheet is the thrermostatic bimetal-plate that compound substance that the metal or alloy that utilizes two kinds of thermal expansivity to differ greatly constitutes is made.
Said eccentric wheel: be offset cam or the eccentric wheel that adopts the polynomial fitting curve shape.
Be provided with the shape that a light barrier edge of a knife shape adopts square circular or trapezoidal or triangle or adopts polynomial fitting curve between two optical fiber collimators, the angle [alpha] of this light barrier incision light path is between 0 °～90 °.
The utility model is compared with background technology, has the following advantages:
1, it can be by changing eccentric shape, make light barrier stroke and light decrement between the nonlinear relationship of existence obtain the correction of linearity;
2, on the continuously adjustable basis of light decrement, also realized Digital Control,, can accurately regulate light decrement according to the number of input pulse;
3, not only driving voltage is low for coil electromagnetism driving optical attenuator, and drive the driving of employing electric pulse, and need not keep its duty by steady voltage, can reduce device power thus, avoid putting aside at device inside, improve job stability because of the too high generation heat of power;
4, have auto-lock function, only need to utilize electric pulse to realize conversion of operation state, need not keep its duty by steady voltage, can reduce device power thus, improve job stability;
5, light barrier is driven by electric pulse, and stepping rate is fast, and the response time is less than 0.8 millisecond, insert loss and be lower than 0.5 decibel, return loss is higher than 50 decibels, and the wavelength dependence loss is less than 0.1 decibel, polarization correlated loss is less than 0.1 decibel, and dynamic range is 50 decibels, and operating voltage is less than 12 volts;
6, its structure reproducibility of adopting is good, and can accurately locate, and compares with the optical attenuator of technology formerly, utilizes mechanical microfabrication techniques, can realize the integrated processing of gear, tooth bar, rotating shaft and substrate, and technology is simple, helps producing in enormous quantities.
Description of drawings
Fig. 1 is a digitizing Electromagnetic Drive adjustable optical attenuator structural representation of the present utility model.
Fig. 2 is a light barrier stroke amplification assumption diagram.
Fig. 3 is the light path synoptic diagram of described optical attenuator.
Fig. 4 is little 4 the enforcement states that advance a period of motion of driving mechanism of digitizing.
Fig. 5 is the synoptic diagram of piezoelectric ceramics displacement driver.
Fig. 6 is the synoptic diagram of static comb displacement driver.
Fig. 7 is the synoptic diagram of thrermostatic bimetal-plate displacement driver.
Fig. 8 is an eccentric wheel shape synoptic diagram.
Fig. 9 is several graph of relation.
Figure 10 is the light decrement curve map before the linearity correction.
Figure 11 is three kinds of existing electric-controlled adjustable optical attenuator synoptic diagram.
Embodiment
As shown in Figure 1, two input-output optical fiber collimating apparatuss 2 through the coupling optical path aligning, 3 are fixed on the substrate 1, two input-output optical fiber collimating apparatuss 2, the light barrier 19 that is connected with flexure strip 4 is set in the middle of 3, light barrier 19 tail ends are under flexure strip 4 effects, contact with the 5 one-tenth points of eccentric wheel on being contained in rotating shaft 7, and the axle center of eccentric wheel 5 rotating shafts 7 is passed on plane, light barrier 19 place, gear 6 and eccentric wheel 5 coaxial being mounted and fixed on together, rotate around the rotating shaft 7 that is vertically fixed on the substrate, the tooth bar 13 that is meshed with gear 6, by horizontal and vertical flexure strip 12,18 respectively with first, the second iron nickel thin slice 11,17 connect, first, the second iron nickel thin slice 11,17 respectively by first, second elasticity of flexure body 10,16 are connected to U sections core (9 separately, 15) a end, U sections core (9,15) be wound with coil (8 on the other end, 14), iron nickel thin slice and U sections core two ends maintain a minim gap (being a tooth pitch of tooth bar) formation magnetic loop.Principle of work of the present utility model is: when a high level voltage is imported at coil 8 two ends, iron core 9 is magnetized in the coil, iron nickel thin slice 11 is adsorbed onto the two ends of U-iron core 9, thus, the elongate resilient sheet 12 drive tooth bars 13 that are connected on the iron nickel thin slice 11 are done transverse movement (being made as positive x direction), and move distance is a tooth pitch of tooth bar; When high level transfers low level to, suction disappears, and iron nickel thin slice 11 is got back to original position under the 10 restoring force effects of elasticity of flexure body, and at this moment, tooth bar 13 is done counter motion (negative x direction), and move distance also is a tooth pitch.In like manner, vertically linking to each other with iron nickel thin slice 17 of tooth bar 13 by elongate resilient sheet 18, when coil 14 is connected an electric pulse, in high level lasting time, iron nickel thin slice 17 is adsorbed onto the two ends of U-iron core 15, the elongate resilient sheet 18 that is connected on the iron nickel thin slice 17 drives tooth bar 13 lengthwise movements (being made as negative y direction), breaks away from the engagement with gear 6; When high level transfers low level to, tooth bar 13 is got back to engagement again, realizes self-locking.
As shown in Figure 4, utilize pulse controlled two Electromagnetic Drive coils to drive that tooth bar is done respectively vertically, transverse movement, come the driven gear rotation.A period of motion is divided 4 enforcement states: Fig. 4 a is the first enforcement state, solenoid 14 is in pulses low, the effect that tooth bar 13 does not vertically stress, so tooth bar 13 is in engagement with gear 6, solenoid 8 reaches pulse high level and keeps a period of time, drive tooth pitch of tooth bar 13 transverse movements (positive x direction), correspondingly turn over a tooth with tooth bar 13 meshed gears 6 clockwise direction; Fig. 4 b is the second enforcement state, and solenoid 8 continues to keep high level, simultaneously, to solenoid 14 input one pulse high level and keep a period of time, drives tooth bar 13 and travels longitudinally (negative y direction), makes tooth bar 13 break away from the engagement of gears 6; Fig. 4 c is the 3rd enforcement state, solenoid 14 continues to keep high level, and promptly tooth bar 13 is kept disengaged position with gear 6, and solenoid 8 reaches pulses low, make tooth bar 13 keep negative tooth pitch of x direction transverse movement in the disengaged position with gear 6, gear 6 positions are unaffected; Fig. 4 d is the 4th enforcement state, and solenoid 8 keeps low level, and solenoid 14 reaches pulses low and keeps a period of time, makes vertically (positive y direction) motion of tooth bar 13, gets back to and gear 6 engagements, realizes self-locking.In the period of motion, gear rotation is crossed a tooth.When the two-way driving pulse of next cycle arrives, action above coil 8,14, tooth bar 13 etc. can repeat under the driving of electric pulse.Adopt a plurality of electric pulses to import continuously, just can realize the rotation of gear 6 clockwise direction.
Be illustrated in figure 2 as light barrier stroke amplification assumption diagram, the rotation of gear 6 will drive the eccentric wheel 5 that is fixed together with it and rotate.Because light barrier 19 ends contact with eccentric wheel 5 holding points under flexure strip 4 effects, eccentric wheel 5 rotates, and promotion light barrier 19 is done the level propelling or retreated.Under the effect of continuous electric pulse, thereby gear rotates stepping rotating eccentricity wheel by tooth, makes in the coupling optical path of light barrier between the input-output optical fiber collimating apparatus and moves, and shears optical path, realizes the digitizing decay to input optical power.
In the utility model, realize the top said driving logic as the displacement driver 20,21 of tooth bar except using solenoid, again with 26,27 groups of piezoelectric ceramics 22,23, static comb structure 24,25, thrermostatic bimetal-plate as displacement driver.
Piezoelectric ceramics displacement driver the 22, the 23rd is repeatedly piled the sticking piezoelectric ceramics that uses that happens frequently of many piezoelectric ceramic pieces, as shown in Figure 5, series connection mechanically between the piezoelectric ceramic piece, in parallel on the circuit.Piezoelectric ceramics is as the micrometric displacement device, have simple in structure, volume is little, resolution is little, frequency response is fast, do not have advantage such as heating problem, is desirable micrometric displacement device, especially is fit to sub-micron so that nanoscale microposition mechanism.Therefore with the piezoelectric ceramics displacement driver, be to realize that digitalized variable optical attenuator is interior among a small circle adjustable, the effective way of precision microposition.The response speed of piezoelectric ceramics displacement is the microsecond level.
The displacement driver 24,25 of static comb structure can be compared with the piezoelectric ceramics displacement driver equally.As shown in Figure 6, its two ends, the left and right sides has the fair plate structure of the staggered comb of two rows respectively, make semi-girder by flexure strip, whole movable broach flat board is suspended on the substrate, under the effect of driving voltage, movable broach is subjected to the electrostatic force of a horizontal direction, makes total produce parallel and substrate bottom surface transverse movement.But the general required driving voltage of static comb is higher, exemplary operation voltage at 100V between the 200V.Adjustable range is at micron order, and the response time is at Millisecond.
As shown in Figure 7, thrermostatic bimetal-plate displacement driver the 26, the 27th, the compound substance that the metal or alloy that utilizes two kinds of thermal expansivity to differ greatly constitutes is made.The metal level (being called active layers) that has the higher thermal expansion coefficient when it is heated is to low-expansion metal level (being called passive layer) bending, so change temperature variation into mechanical displacement.Generally obtain the bending displacement of thrermostatic bimetal-plate by following 3 kinds of modes.1) obtaining heat from contact thermal source or thermal radiation heats up and causes and make thermo bimetal's bending tablet; 2) heating is arranged on around the thrermostatic bimetal-plate, it is crooked that the heat that heating produces heats up it; 3) make working current all or part of by thrermostatic bimetal-plate, utilize the resistance heating of thrermostatic bimetal-plate itself and the bending that heats up.Acting force during the bimetallic strip action is very little, needs to adopt MULTILAYER COMPOSITE to obtain bigger acting force usually.With reference to figure 7, it is a kind of array configuration of grid shape bimetallic strip, and many group bimetallic strips are arranged, and every group is adopted MULTILAYER COMPOSITE.When bimetallic strip is heated, will produce the elasticity thermal deformation, drive spring leaf and produce approximate rectilinear motion.The bimetallic strip response speed is a Millisecond.
The purpose of this utility model is in order finally to obtain importing the linear relationship between driving pulse number N and the light decrement Y.When the light barrier edge of a knife that is in the light is the straight knife mouth, have nonlinear relationship between light barrier stroke S and the light decrement Y, curve shown in Fig. 9 (c), rate of curve increases gradually when high attenuation.Therefore need to regulate the relation between input driving pulse number N and the frequency modulated light sheet stroke S, compensate non-linear between light barrier stroke S and the light decrement.In order to reach this purpose, shown in Fig. 8 (b), eccentric wheel 28 profiles can be made the shape of polynomial fitting curve, when concerning the compensated curve that meets shown in Fig. 9 (b) between input driving pulse N and the light barrier stroke S, just can obtain importing the linear dependence between driving pulse N and the light decrement Y, as Fig. 9 (a), thereby proofread and correct the non-linear of light barrier stroke and light decrement.Fig. 8 (a) is general eccentric wheel, does not carry out linearity correction, then import between driving pulse N and the light decrement Y dependence as shown in figure 10.It obviously is non-linear.
In order to reach the linear relationship between input driving pulse number N and the light decrement Y, can also be by changing the be in the light shape of the edge of a knife of light barrier 19, have nonlinear relationship between adjusting light barrier stroke S and the light decrement Y, finally obtain the linear relationship between driving pulse number N and the light decrement Y.
Be illustrated in figure 2 as the light path synoptic diagram of described optical attenuator.Input optical signal is entered by input optical fibre collimating apparatus 2, aims at output optical fibre collimating apparatus 3 through coupling optical path, inserts light barrier 19 in the coupling optical path, according to the stroke that is in the light of light barrier 19, regulates the damping capacity of input optical power.
Claims (7)
1. digitizing Electromagnetic Drive adjustable optical attenuator, it is characterized in that: through two input-output optical fiber collimating apparatuss (2 of coupling optical path aligning, 3) be fixed on the substrate (1), two input-output optical fiber collimating apparatuss (2, the light barrier (19) that is connected with flexure strip (4) is set 3), the flexure strip (4) of light barrier (19) tail end is put with eccentric wheel (5) one-tenth on being contained in rotating shaft (7) and is contacted, and the axle center of rotating shaft (7) is passed on light barrier (19) plane, place, gear (6) and eccentric wheel (5) is coaxial is mounted and fixed on together, can rotate around the rotating shaft (7) that is vertically fixed on the substrate, the tooth bar (13) that is meshed with gear (6) is contained on the transverse elasticity sheet (12), transverse elasticity sheet (12) is connected with longitudinal elasticity sheet (18), transverse elasticity sheet (12) and longitudinal elasticity sheet (18) respectively with the displacement driver (20 that is contained on the substrate (1) separately, 21) connect.
2. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1, it is characterized in that: said displacement driver (20,21) comprises that first, second iron nickel thin slice (11,17) that is connected with longitudinal elasticity sheet (18) with transverse elasticity sheet (12) is connected to an end of U sections core (9,15) separately respectively by first, second elasticity of flexure body (10,16), be wound with coil (8,14) on the other end of U sections core (9,15), iron nickel thin slice (11,17) maintains a minim gap with U sections core (9,15) two ends respectively and constitutes magnetic loop.
3. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1 is characterized in that: said displacement driver (20,21) comprises respectively that several pieces that be connected with longitudinal elasticity sheet (18) with transverse elasticity sheet (12) are mechanically connected, the sticking repeatedly heap (22,23) of the piezoelectric ceramics that comes that happens frequently of piezoelectric ceramic piece in parallel on the circuit.
4. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1, it is characterized in that: said displacement driver (20,21) comprises respectively has the fair plate structure of the staggered comb of two rows respectively with the two ends, the left and right sides that transverse elasticity sheet (12) is connected with longitudinal elasticity sheet (18), make semi-girder by flexure strip, make whole movable broach flat board be suspended on static comb (24,25) on the substrate.
5. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1 is characterized in that: said displacement driver (20,21) comprises that respectively what be connected with longitudinal elasticity sheet (18) with transverse elasticity sheet (12) is the thrermostatic bimetal-plate (26,27) that compound substance that the metal or alloy that utilizes two kinds of thermal expansivity to differ greatly constitutes is made.
6. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1 is characterized in that: said eccentric wheel (5) is offset cam or the eccentric wheel that adopts the polynomial fitting curve shape.
7. a kind of digitizing Electromagnetic Drive adjustable optical attenuator according to claim 1 is characterized in that: be provided with the shape that a light barrier (19) edge of a knife shape adopts square circular or trapezoidal or triangle or adopts polynomial fitting curve between two optical fiber collimators (2,3); The angle [alpha] of this light barrier (19) incision light path is between 0 °～90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032323247U CN2627539Y (en) | 2003-06-17 | 2003-06-17 | Digitalized electromagnetic driving adjustable optical attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032323247U CN2627539Y (en) | 2003-06-17 | 2003-06-17 | Digitalized electromagnetic driving adjustable optical attenuator |
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| CN2627539Y true CN2627539Y (en) | 2004-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU032323247U Expired - Lifetime CN2627539Y (en) | 2003-06-17 | 2003-06-17 | Digitalized electromagnetic driving adjustable optical attenuator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332318A (en) * | 2011-07-18 | 2012-01-25 | 中国原子能科学研究院 | First collimator adjusting device of neutron texture diffractometer |
| CN103542871A (en) * | 2013-09-22 | 2014-01-29 | 山东建筑大学 | Optical fiber sensor on basis of carbon fiber materials |
| CN107870395A (en) * | 2016-09-27 | 2018-04-03 | 福州高意通讯有限公司 | A kind of VOA of PZT drivings |
| CN115291344A (en) * | 2022-08-18 | 2022-11-04 | 武汉联特科技股份有限公司 | Optical module with adjustable attenuation |
-
2003
- 2003-06-17 CN CNU032323247U patent/CN2627539Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332318A (en) * | 2011-07-18 | 2012-01-25 | 中国原子能科学研究院 | First collimator adjusting device of neutron texture diffractometer |
| CN103542871A (en) * | 2013-09-22 | 2014-01-29 | 山东建筑大学 | Optical fiber sensor on basis of carbon fiber materials |
| CN107870395A (en) * | 2016-09-27 | 2018-04-03 | 福州高意通讯有限公司 | A kind of VOA of PZT drivings |
| CN115291344A (en) * | 2022-08-18 | 2022-11-04 | 武汉联特科技股份有限公司 | Optical module with adjustable attenuation |
| CN115291344B (en) * | 2022-08-18 | 2023-05-16 | 武汉联特科技股份有限公司 | Optical module with adjustable attenuation |
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