CN1219235C - Continuous regulatable digital display type optical fiber attenuator - Google Patents
Continuous regulatable digital display type optical fiber attenuator Download PDFInfo
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- CN1219235C CN1219235C CNB031296068A CN03129606A CN1219235C CN 1219235 C CN1219235 C CN 1219235C CN B031296068 A CNB031296068 A CN B031296068A CN 03129606 A CN03129606 A CN 03129606A CN 1219235 C CN1219235 C CN 1219235C
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- digital display
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- optical fiber
- awl tube
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Abstract
The present invention relates to a continuously adjustable digital display type optical fibre attenuator which comprises that a bare optical fibre is wounded on the external surface of a conic elastic cylinder with a thin wall in a helix mode; a crown plate is fixed to the inside edge of the conic elastic cylinder; the contact surface between the crown plate and the conic elastic cylinder is a circular arc surface; another side of the crown plate is provided with a groove connected with a wedged push plate, and the conic elastic cylinder is hung outside a tension device; a wedged plate is arranged inside the guide slot of a supporting base, and both sides are tensed by springs; the device is sealed inside a casing, and the inner surface of the casing is coated with a film with a high reflectance; the wedged push plate is connected with a drive shaft, and a rectilinear motion drive mechanism is composed of a screwed linking block, the drive shaft, a drive type elastic shaft coupling and a step motor; a detecting device is arranged inside the casing; a microprocessor is used for collecting data, the optical fiber attenuation situation is displayed through data processing, and the motion of the step motor is controlled according to requirements and the result of the data processing.
Description
Technical field:
The present invention relates to optical-fibre communications, be meant a kind of continuous adjustable digital display type fibre optic attenuator especially.
Background technology:
Fibre optic attenuator is a kind of very important optical passive component in optical communication field, is mainly used in the aspect such as assessment, research and adjustment, correction of optical communication line, system.Existing fibre optic attenuator mainly contains fixed and adjustable two kinds.The attenuation ratio of fixed attenuator is fixed.But in fibre system, usually need the optical signal value in each parts of accuracy-control system,, need to adopt the adjustable optic fiber attenuator as in the test of system applies and characterisation stage, occasions such as assessment, metering and calibration to system.Present adjustable optic fibre attenuator is to cut off optical fiber mostly, by change two connect between end faces the clearance or radially relativity shift realize, perhaps adopt film absorption to filter and realize.This class device all has very high requirement to mechanically operated precision, stability.And, cut off optical fiber and make in the process of light transmission decay, can produce very big luminous power reflection, reflected light influences the signal to noise ratio (S/N ratio) of stability of light source and transmission signals, thereby reduces the quality of transmission.In addition, this adjustable attenuator adopts manual adjustments more, can't meet the demands to the accurate occasion that quantizes of needs, therefore is necessary to adopt high-precision continuous variable formula relaxation equipment, to satisfy the requirement in the practical application.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, and a kind of continuous adjustable digital display type fibre optic attenuator is provided, and it should have precision height, stable performance, simple in structure, easy to operate, the characteristics that cost performance is high adjusted.
Technical solution of the present invention is as follows:
A kind of continuous adjustable digital display type fibre optic attenuator is characterized in that its formation comprises:
The conical elasticity awl of the thin-walled tube that one inside stretches and can produce distortion to both sides, one bare fibre is wrapped in the outside surface of this elasticity awl tube in a spiral manner, this optical fiber has input end and output terminal, fixedly connected with top board in the inside edge of elasticity awl tube, the surface of contact of this top board and elasticity awl tube is an arc surface, the opposite side of this top board is provided with groove, is connected with the wedge shape push pedal, thereby makes elasticity awl tube be suspended on the outside of tensioning system.Plate wedge is installed in the guide-track groove of base for supporting, strain with spring both sides, when the wedge shape push pedal travels forward under the driving force effect, promote plate wedge to two side shiftings, drive top board from outside extruding elasticity awl tube, said apparatus is sealed in the housing, and the inside surface of this housing is coated with the rete of high reflectance.
The wedge shape push pedal of described device links to each other with transmission shaft, thread connection piece, transmission shaft, drive-type spring coupling and the stepper motor motion driving system that is in line; Also being provided with sniffer in this housing changes with the light intensity of surveying closure casing;
One microprocessor, its function are to receive the data that sniffer is gathered, and carry out data processing, show the optical fiber attenuation on its display screen, and as required with the motion of data processed result control step motor.
Said sniffer adopts the light power meter of high sensitivity, high stability, or selection has large-area PD detection probe, has the small light power meter that intelligence is exported.
Before using, should demarcate in advance by described continuous adjustable digital display type fibre optic attenuator, its method is: in closure casing, import by optic fibre input end with the light that pre-determines power, detect output power at fiber-optic output, under the control of microprocessor, the step motor drive transmission shaft promotes wedge shape push pedal campaign, when elasticity awl tube produces flexural deformation, the light intensity that the photoconduction that the inside of optical fibre decay scatters causes enclosure changes, this changing value can be detected by sniffer, and relevant data is stored in the internal memory of microprocessor.
This fibre optic attenuator should be demarcated before using in advance, and timing signal can carry out interpolation and curve fitting to data.
Advantage of the present invention: the present invention can realize decay to the optical fiber lossless operation.Mechanical device structure is simple, lower to the requirement of process and assemble, transmission accuracy is less demanding.Output has very high precision, adjustable continuously.Control function is easy to realize, and is simple to operate.Be particularly suitable for the output of requirement optical fiber and need numeral regulation and control, the reliable occasion of stable precision.
Description of drawings:
Fig. 1 is the theory structure sketch of optical fiber attenuation.
Fig. 2 is the structural representation of the continuous adjustable digital display type fibre optic attenuator single unit system of the present invention.
The synoptic diagram that elasticity awl tube is connected with tensioning system in Fig. 3 apparatus of the present invention.
Fig. 4 is for elasticity awl tube in apparatus of the present invention and twine optical fiber synoptic diagram on it.
Fig. 5 is the structural representation of the interior both sides of elasticity awl tube top board in apparatus of the present invention.
Embodiment
Attenuation principle of the present invention when the Transmission Fibers somewhere is squeezed generation flexural deformation, then produces scattering loss and forms decay as shown in Figure 1, and with the radius-of-curvature difference of this place's fibre-optical bending, damping capacity also changes thereupon.
The structure of the continuous adjustable digital display type fibre optic attenuator of the present invention such as Fig. 2, shown in Figure 3, wherein 1 is the inner conical elasticity awl of the thin-walled tube that stretches and can produce distortion to both sides, its elasticity guarantees that external force is cancelled under the situation and can restore to the original state that bare fibre is wrapped in 1 outside surface with spiral fashion.Fixedly connected with top board 2,9 in the inside edge of elasticity awl tube 1, top board 2,9 and awl tube surface of contact are arc surface, and be tapered to big end from awl tube 1 small end, thereby can limit the bending curvature of contact position, and the bending curvature at each contact point place is gradually changed.Opposite side processes groove, is connected with plate wedge 4,8, thereby makes elasticity awl tube 1 be suspended on the outside of tensioning system.13 is the base for supporting of tensioning system.Plate wedge 4,8 is installed in the guide-track groove of base for supporting 13, and both sides are with spring 21,22 tensions.6 is the wedge shape push pedal, when wedge shape push pedal 6 travels forward under the driving force effect, promote plate wedge 4,8 to two side shiftings, drive top board 2,9 from inboard extruding elasticity awl tube 1, change with displacement, the radius-of-curvature of contact position is also corresponding to change, and promptly optical fiber herein constantly is out of shape the realization decay.When wedge shape push pedal 6 was moved backward, plate wedge 4,8 ran back under the effect of spring restoring force, and elasticity awl tube 1 restores to the original state under self elastic reaction.Thread connection piece 15, transmission shaft 16, drive-type spring coupling 17 and stepper motor 18 are formed the rectilinear motion drive system.
For the pad value that makes system meets the requirement of required input decay value, native system adopts the method for demarcating in advance.Be coated with the rete 14 of high reflectance at the inside surface of closure casing 12.Import by optic fibre input end 11 with the light that pre-determines power, detect output powers at fiber-optic output 3.When elasticity awl tube 1 produced flexural deformation, the light intensity that the photoconduction that the inside of optical fibre decay scatters causes closure casing 12 inside changed, and this changing value can be detected by detection system 19, and can be stored in the internal memory of microprocessor 20.Because various losses, the numerical value of Tan Ceing and to be not equal to input 11 be pad value with output 3 difference thus, but note input 11 and the difference of output 3 and the indicating value of optical power detecting system 19, under the situation that system is fixed, surveying indicating value and damping capacity is to concern one to one.Therefore repeatedly repeat this operation, with the data storage of gathering in the internal memory of microprocessor 20.In order to reach higher precision, data are carried out interpolation and curve fitting also is necessary.Microprocessor 20 is the switch and the straight-line displacement of control-driven system simultaneously.In the practical application afterwards, system with in advance calibration value as the reference standard.Pad value is transferred to required numerical value, and control system can be determined the variation that detection system should detect from the data of demarcating, when probe value is consistent with desired value, stop to drive, thus the decay of realization input quantitative value.
The conical elasticity awl of said thin-walled tube as shown in Figure 4, optical fiber is wrapped in outside surface in a spiral manner, is coated with a little silica gel in order to fixed fiber in the non-knee of optical fiber, for fear of the absorption of barrel surface to light intensity, improve the precision that loss is surveyed, will there be certain smooth finish on the barrel surface.
Said top board 2,9 as shown in Figure 5, be arc surface with awl tube 1 surface of contact, the contact position is tapered to big end from small end, like this from small end to big end, the bending curvature radius at each point place is gradual change, thereby the optical fiber that twines on it is decayed gradually, so not only can improve the precision of decay, and can reduce greatly mechanically operated accuracy requirement.
Said closure casing 12 will have good sealing.Because the accuracy requirement of optical fiber attenuation is very high, can resolved detection go out high-precision damping capacity in order to ensure sniffer 19, accuracy requirement except sniffer 19 itself, the light that yet will guarantee the optical fiber attenuation outgoing can not lose or be absorbed by medium in a large number, therefore the fluid sealant sealing is adopted in the junction of closure casing 12, and the demanding reflectivity of inner walls, so housing 12 inwalls can be coated with aluminum membranous layer, the light that can guarantee the optical fiber attenuation outgoing like this is detected device 19 and distinguishes.
Said sniffer 19 can adopt the light power meter of high sensitivity, high stability.As selecting to have large-area PD detection probe, having the small light power meter that intelligence is exported.The numerical value that detects output is real-time transmitted to by data transfer interface among the RAM of microprocessor 20, compares by the data value with demarcation storage in advance, and then realizes the control of required input pad value.
Said control system function comprises that the storage of nominal data, the input of adjusting numerical value are read, data relatively reach the real-time control to the rectilinear motion drive system according to the result.
Said actuating device of the linear motion is made up of step-by-step movement drive motor 18, drive-type spring coupling 17, screw mandrel transmission shaft 16, thread connection piece 15, this kind of means drives steadily reliable, drives precision and also can realize by changing 15,16 flight pitch.
The continuous adjustable digital display type fibre optic attenuator of the present invention is dropped into actual the use, adopting resolution is that the light power meter of 0.001dB is as detecting element, after the single mode fiber system of wavelength 1310nm and 1550nm demarcated, consider the insertion loss, the system attenuation scope can reach 0.5-60dB, display resolution reaches 0.1dB, satisfies requirement of actual application.
In sum, advantage of the present invention can reduce: the present invention can realize decay to the optical fiber lossless operation, mechanical device structure is simple, requirement to process and assemble is lower, transmission accuracy is less demanding, output has very high precision, adjustable continuously, simple to operate, is particularly suitable for requirement optical fiber and exports occasion stable, that precision is reliable and requirement is controlled automatically.
Claims (4)
1, a kind of continuous adjustable digital display type fibre optic attenuator is characterized in that its formation comprises:
The conical elasticity awl tube of one thin-walled (1), one bare fibre is wrapped in the outside surface of this elasticity awl tube (1) in a spiral manner, this optical fiber has input end (11) and output terminal (3), the inside edge and the top board (2 of elasticity awl tube (1), 9) fixedly connected, this top board (2,9) surface of contact with elasticity awl tube (1) is an arc surface, this top board (2,9) opposite side is provided with groove (21), be connected with wedge shape push pedal (6), the base for supporting of tensioning system (13), plate wedge (4,8) be installed in the guide-track groove of base for supporting (13), both sides are with spring (21,22) tension, when wedge shape push pedal (6) promotes plate wedge (4,8) to two side shiftings, drive top board (2,9) from outside extruding elasticity awl tube (1), said apparatus is sealed in the housing (12), and the inside surface of this housing (12) is coated with the rete (14) of high reflectance:
The wedge shape push pedal (6) of described device links to each other with transmission shaft (16), and thread connection piece (15), transmission shaft (16), drive-type spring coupling (17) and stepper motor (18) are formed wedge shape push pedal (6) driving mechanism; Also being provided with sniffer (19) in this housing (12) changes with the light intensity of surveying in the closure casing (12);
One microprocessor (20), its function are to receive the data that sniffer (19) is gathered, and carry out data processing, show the optical fiber attenuation on its display screen, and as required with the motion of data processed result control step motor (18).
2, continuous adjustable digital display type fibre optic attenuator according to claim 1, it is characterized in that said sniffer (19) adopts the light power meter of high sensitivity, high stability, or selection has large-area PD detection probe, has the small light power meter that intelligence is exported.
3, continuous adjustable digital display type fibre optic attenuator according to claim 1, it is characterized in that to demarcate in advance before this fibre optic attenuator uses, its method is: in closure casing (12), import by optic fibre input end (11) with the light that pre-determines power, detect output power at fiber-optic output (3), under the control of microprocessor (20), stepper motor (18) drives transmission shaft (16) and promotes wedge shape push pedal (6) motion, when elasticity awl tube (1) produces flexural deformation, the photoconduction that the inside of optical fibre decay scatters causes the inner light intensity of closure casing (12) and changes, this changing value can be detected by sniffer (19), and relevant data is stored in the internal memory of microprocessor (20).
4, continuous adjustable digital display type fibre optic attenuator according to claim 3 is characterized in that should demarcating in advance before this fibre optic attenuator uses, and timing signal can carry out interpolation and curve fitting to data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031296068A CN1219235C (en) | 2003-06-27 | 2003-06-27 | Continuous regulatable digital display type optical fiber attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031296068A CN1219235C (en) | 2003-06-27 | 2003-06-27 | Continuous regulatable digital display type optical fiber attenuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1475855A CN1475855A (en) | 2004-02-18 |
| CN1219235C true CN1219235C (en) | 2005-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031296068A Expired - Fee Related CN1219235C (en) | 2003-06-27 | 2003-06-27 | Continuous regulatable digital display type optical fiber attenuator |
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| CN (1) | CN1219235C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104155753B (en) * | 2014-08-28 | 2016-04-27 | 成都美美通信技术有限公司 | Continuously adjustable fibre optic attenuator |
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- 2003-06-27 CN CNB031296068A patent/CN1219235C/en not_active Expired - Fee Related
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| CN1475855A (en) | 2004-02-18 |
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Granted publication date: 20050914 Termination date: 20100627 |