CN2519303Y - All optical fiber light adjustable attenuator - Google Patents
All optical fiber light adjustable attenuator Download PDFInfo
- Publication number
- CN2519303Y CN2519303Y CN 01271511 CN01271511U CN2519303Y CN 2519303 Y CN2519303 Y CN 2519303Y CN 01271511 CN01271511 CN 01271511 CN 01271511 U CN01271511 U CN 01271511U CN 2519303 Y CN2519303 Y CN 2519303Y
- Authority
- CN
- China
- Prior art keywords
- optical
- optical fiber
- slide block
- fiber
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Light Guides In General And Applications Therefor (AREA)
Abstract
The utility model which discloses a full fiber adjustable optical attenuator used in optical fiber communications comprises a cavity body (1) which consists of shells and which is internally provided with a slide rail (3), wherein, a strip slide block (4) is in sliding match with the slide rail (3) and a round optical fiber ring (5) below the slide block (4) is in squeezing match with the slide block (4); the optical fiber ring (5) is formed by winding a plurality of rings by an optical fiber; two ends of the optical fiber ring (5) are connected with input optical fibers (6) and output optical fibers (7); one end of the cavity (1) is matched with a screw thread of the slide block (4) and extends to a screw rod (8) outside the cavity (1) and the other end of the screw rod (8) is fixedly provided with a button (9) which controls the rotation of the screw rod (8). The utility model has the advantages of low cost, high adjusting accuracy, wide adjusting ranges, extremely low additional loss, high echo loss and small corresponding polarization loss.
Description
Technical field the utility model relates to a kind of attenuator that is used for optical fiber communication, in particular, is a kind of full optical-fibre adjustable optical attenuator.
The background technology optical attenuator is the passive device in the optical communication, can be divided into fixed optical attenuator and variable optical attenuator, fixed attenuator carries out the decay of fixed amount to the luminous energy in the light path, has that good temp characteristic, price are lower, the advantage of stable performance, but uses underaction.Variable optical attenuator can be divided into intelligent optical attenuator, type hand optical attenuator again; Intelligent optical attenuator can be divided into mechanical variable optical attenuator, waveguide type optical attenuator, photoelectric effect type optical attenuator etc. again.Intelligent optical attenuator damping capacity adopts circuit control, and is adjustable continuously, the attenuation accuracy height, and volume is little, but costs an arm and a leg; Common type hand optical attenuator damping capacity continuous variable, but littler than the attenuation range of intelligent optical attenuator, attenuation accuracy is not good enough, Polarization Dependent Loss is big, is mainly used in the less demanding occasion of attenuation accuracy.
The summary of the invention the purpose of this utility model provides the full optical-fibre adjustable optical attenuator of continuously adjustable type hand that a kind of Polarization Dependent Loss is little, attenuation accuracy is high, attenuation range is big, return loss is high, cost is low.
The utility model is achieved in that and includes the cavity of being made up of shell 1, be fixed on support 2 is housed in the cavity 1, slide rail 3 is housed on the support 2, the slide block 4 and the slide rail 3 of bar shaped are slidingly matched, below slide block 4, there is circular fiber turns 5 to cooperate with slide block 4 extruding, fiber turns 5 is twined multi-turn by an optical fiber and is constituted, and two terminations of fiber turns 5 connect the optical fiber 6 of input and the optical fiber 7 of output respectively.
One end and slide block 4 threaded engagement are arranged in cavity 1 and extend to the screw rod 8 of cavity 1 outside, the other end of screw rod 8 is fixed with the knob 9 that control screw rod 8 rotates.
Described fiber turns 5 is wound in multi-turn by an optical fiber, compares with individual pen optical fiber and has not only strengthened damping capacity, has also strengthened the flexural strength of optical fiber, has improved reliability.
Described fiber turns 5 is wound in multi-turn by an optical fiber, and twisted fiber when twining optical fiber makes that the polarization state in the optical fiber produces skew with reversing of optical fiber, whenever turns round and circles, and polarization state is offset about 11 °.The change of polarization state makes the polarization state by the bending loss of optical fiber place change in the optical fiber, thereby makes the multi-ring fiber relevant loss of polarization of cancelling out each other, and greatly reduces the polarization correlated of attenuator.
After having adopted said structure, do the time spent, can produce the bending of certain curvature radius, cause that energy is leaked to covering, thereby cause decay when columniform single-mode fiber is subjected to certain external force.Reduce the pitch of screw rod, just can increase degree of regulation, in 0～20dB scope, reach 0.02dB, in 20～40dB scope, reach 0.1dB; Increase screw flight length, just can add wide adjusting range, can reach 60dB; Increase optical fiber and twine radius, just can reduce added losses＜0.02dB; This attenuator is full optical fibre device, the middle end face that causes reflection, return loss height＞65dB of not existing.
The utility model is described in further detail below in conjunction with accompanying drawing and concrete embodiment for description of drawings.
Fig. 1 is a structural representation of the present utility model.
Embodiment as shown in Figure 1, full optical-fibre adjustable optical attenuator, include the cavity of forming by shell 1, be fixed on support 2 is housed in the cavity 1, the slide block 4 that slide rail 3, bar shaped are housed on the support 2 is slidingly matched with slide rail 3, have circular fiber turns 5 to cooperate with slide block 4 extruding below slide block 4, fiber turns 5 is twined multi-turn by an optical fiber and is constituted, and two terminations of fiber turns 5 connect the optical fiber 6 of input and the optical fiber 7 of output respectively.
In the said structure, the utility model primary structure designs in the cavity 1 that shell surrounds, and wherein slide rail 3 also can be fixed on the inwall of cavity 1, and slide block 4 also can be designed as other shapes of extruding fiber turns 5 distortion.
In order to regulate the shape of fiber turns 5, change the decay of light, an end and slide block 4 threaded engagement are arranged in cavity 1 and extend to the screw rod 8 of cavity 1 outside, the other end of screw rod 8 is fixed with the knob 9 of control screw rod 8 rotations.
For fiber turns 5 flexural strengths are strengthened, improve reliability, strengthen damping capacity, fiber turns 5 is twined multi-turn by an optical fiber and is formed.
In this application, in order to make fiber turns 5 firm, can adopt slots on shell and slide block 4 cooperates with fiber turns 5.
In order to reduce Polarization Dependent Loss, twisted fiber when twining optical fiber, the polarization state in the optical fiber produces skew with reversing of optical fiber, whenever turns round and circles, and polarization state is offset about 11 °.The change of polarization state makes the polarization state by the bending loss of optical fiber place change in the optical fiber, thereby makes the multi-ring fiber relevant loss of polarization of cancelling out each other, and greatly reduces the polarization correlated of attenuator.
The utility model utilizes the bending loss principle of optical fiber, bending loss comes from the radiation in the tail step that extends to the evanescent field in the covering, this part field transmission in fibre core, carry energy jointly, but when optical fiber bends, the evanescent field afterbody that is arranged in center of curvature distally must could together advance with the field of fibre core with bigger speed, in the distance from fibre core is certain critical distance place, the afterbody of evanescent field is attenuated, when degree of crook strengthens, when radius-of-curvature reduced, decay was with proportional increase.
The utility model because adjusting knob and transmission shaft are to tighten together, rotate transmission shaft by adjusting knob, thereby slide block is moved in use, has changed the degree of crook of fibre turn, and then the decay size of scalable luminous power.
Claims (5)
1, full optical-fibre adjustable optical attenuator, including the cavity of being made up of shell (1), the slide block (4) that slide rail (3), bar shaped are housed in cavity (1) and slide rail (3) is slidingly matched, it is characterized in that: have circular fiber turns (5) to cooperate in the below of slide block (4) with slide block (4) extruding, fiber turns (5) is twined multi-turn by an optical fiber and is formed, and two terminations of fiber turns (5) connect the optical fiber (6) of input and the optical fiber (7) of output respectively.
2, full optical-fibre adjustable optical attenuator according to claim 1, it is characterized in that: an end and slide block (4) threaded engagement are arranged in cavity (1) and extend to the outside screw rod (8) of cavity (1), the other end of screw rod (8) is fixed with the knob (9) that control screw rod (8) rotates.
3, full optical-fibre adjustable optical attenuator according to claim 1 is characterized in that: described fiber turns (5) by an optical fiber in the shape of a spiral shape reverse the back and twine multi-turn.
4, full optical-fibre adjustable optical attenuator according to claim 3 is characterized in that: described fiber turns (5) by an optical fiber in the shape of a spiral shape whenever turn round to turn around and twine a circle.
5, according to claim 3 or 4 described full optical-fibre adjustable optical attenuators, it is characterized in that: described fiber turns (5) by an optical fiber in the shape of a spiral shape reverse the back and twine the 30-50 circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01271511 CN2519303Y (en) | 2001-12-31 | 2001-12-31 | All optical fiber light adjustable attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01271511 CN2519303Y (en) | 2001-12-31 | 2001-12-31 | All optical fiber light adjustable attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2519303Y true CN2519303Y (en) | 2002-10-30 |
Family
ID=33676947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01271511 Expired - Fee Related CN2519303Y (en) | 2001-12-31 | 2001-12-31 | All optical fiber light adjustable attenuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2519303Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536091A (en) * | 2014-12-12 | 2015-04-22 | 中国电子科技集团公司第二十三研究所 | Non-damage tunable optical fiber power attenuator |
| CN109541752A (en) * | 2018-11-06 | 2019-03-29 | 重庆邮电大学 | A kind of variable optical attenuator based on all -fiber light control system |
| CN113820811A (en) * | 2021-11-22 | 2021-12-21 | 常州安费诺福洋通信设备有限公司 | 5G optical fiber switch box |
-
2001
- 2001-12-31 CN CN 01271511 patent/CN2519303Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536091A (en) * | 2014-12-12 | 2015-04-22 | 中国电子科技集团公司第二十三研究所 | Non-damage tunable optical fiber power attenuator |
| CN109541752A (en) * | 2018-11-06 | 2019-03-29 | 重庆邮电大学 | A kind of variable optical attenuator based on all -fiber light control system |
| CN113820811A (en) * | 2021-11-22 | 2021-12-21 | 常州安费诺福洋通信设备有限公司 | 5G optical fiber switch box |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101408641B (en) | Taper microstructure optical fiber high-order mode filter | |
| CA2293132A1 (en) | Triple-clad rare-earth doped optical fiber and applications | |
| CN100476471C (en) | Single-mode optical fiber | |
| CN2519303Y (en) | All optical fiber light adjustable attenuator | |
| CN101063734A (en) | Bending limiter | |
| CA2324089A1 (en) | High fiber count, compact, loose tube optical fiber cable employing ribbon units and flexible buffer tubes | |
| CN102904641A (en) | Communication system based on few-mode optical fiber | |
| CN113406742A (en) | Multi-core optical fiber for different application scenes and preparation method | |
| CN106597603A (en) | Novel few-mode fiber | |
| CN105807364B (en) | A kind of long-period fiber grating and preparation method thereof micro-bend based on machinery | |
| CN106842419A (en) | A kind of broadband bend-insensitive multimode fibre | |
| CN105158843B (en) | A kind of thin footpath bend insensitive fiber and preparation method thereof | |
| CA2124380A1 (en) | Optical device with a pig tail optical fiber and its production method | |
| CN109633812A (en) | A kind of panda type polymer polarization maintaining optical fibre and its application | |
| CN209746179U (en) | novel high-efficiency multi-mode converter | |
| CA2314961A1 (en) | Dispersion shifted optical fiber | |
| EP0013972A1 (en) | Tapered mixing rod for a fiber optical multi-port coupler | |
| CN1176399C (en) | Optical fiber type variable optical attenuator | |
| CN204422817U (en) | A kind of miniaturization hot swappable optical attenuator | |
| EP0887669A3 (en) | High dispersion zero waveguide fiber | |
| CN102866455B (en) | Large mode field optical fiber transmission system | |
| CN203981923U (en) | A kind of counter-bending connector tail end sheath | |
| CN106199831A (en) | A kind of silica-based close-coupled mode step number converter and conversion method | |
| CN206235757U (en) | A kind of new less fundamental mode optical fibre | |
| EP1298464A3 (en) | Silica optical fibre with polymer double cladding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |