CN2546900Y - Adjustable optical attenuator - Google Patents
Adjustable optical attenuator Download PDFInfo
- Publication number
- CN2546900Y CN2546900Y CN 01256129 CN01256129U CN2546900Y CN 2546900 Y CN2546900 Y CN 2546900Y CN 01256129 CN01256129 CN 01256129 CN 01256129 U CN01256129 U CN 01256129U CN 2546900 Y CN2546900 Y CN 2546900Y
- Authority
- CN
- China
- Prior art keywords
- parallel light
- fiber parallel
- output
- optical
- detecting device
- Prior art date
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- Expired - Lifetime
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Abstract
The utility model relates to an adjustable optical attenuator, which comprises an input device and an output device that respectively receive and emit optical signal; a movable reflective lens is arranged between the input and output devices; a driving device is used to adjust the position of the movable reflective lens, wherein, the input device further comprises a double optical fiber parallel light tube and a filter adhered on the end face, and can receive optical signal and then reflect partial optical signal as detection signal, the detection signal is fed back to the driving device for controlling the movable reflective lens persistently, thereby changing the coupling efficiency between the optical signal and the output device.
Description
[technical field]
The utility model is about a kind of adjustable optical attenuator, particularly about a kind of adjustable optical attenuator with detection backfeed loop.
[background technology]
Generally speaking, adjustable optical attenuator, can adopt the change in location of variable neutral density filter to realize variable attenuation, the differently curved distortion that also can adopt optical fiber is to produce the loss of light signal, maybe can change by the relative position of catoptron and I/O end the adjusting that realizes damping capacity etc.
As United States Patent (USP) the 5th, 745, the voltage-controlled attenuator that is disclosed for No. 634, it comprises input lens, an adjustable damping device, the output lens of an output attenuatoin light signal and the pick-up unit of the light signal strength of a detection through decaying of accepting incident beam, this pick-up unit can be with measurement feedback to the adjustable damping device, control this attenuating device along the light path translational movement, make to reach required damping capacity.Higher because of the cost of variable attenuation sheet and lens, the cost of attenuator improves; And the wave phenomenon that can produce in the attenuate light spectral limit is interfered on the surface of variable attenuation sheet, causes the damping capacity instability.
And for example United States Patent (USP) the 6th, 149, the variable optical attenuator that is disclosed for No. 278, rotation by two parallel mirrors makes the light signal translation, thereby the light signal that is coupled to output optical fibre is decayed, and wherein, pick-up unit is arranged at and inputs or outputs end, in order to sensed light signal intensity, and detected value fed back to drive units such as motor so that parallel mirror is rotated adjusting.The angle that this variable optical attenuator is crossed catoptron changes the coupling efficiency that changes light signal, wherein, two catoptrons must remain strict parallel relation, therefore, product need when making to this two parallel mirror in addition accurately adjustment guaranteeing parallel relation, thereby improve design and manufacture difficulty; Secondly, the input of this attenuator and output terminal can only be respectively in the both sides of catoptron, and the interelement relative position relation is fixed, and therefore, the length and the size of product are bigger, and the product design geometry designs is limited simultaneously.
[summary of the invention]
The purpose of this utility model is to provide the adjustable optical attenuator that a kind of structure is light and handy and attenuation accuracy is high.
The utility model adjustable optical attenuator comprises: an input media, an output unit, at least one moving reflector that is arranged in input media and output unit light path, the drive unit of a control moving reflector position and the detecting device that is coupled with drive unit, wherein, this input media further comprises two optical fiber parallel light tubes and optical filter, this optical filter is pasted on two optical fiber parallel light tube end faces, this pair optical fiber parallel light tube matches with detecting device, this output unit further comprises single fiber parallel light tube and beam splitter, and this beam splitter matches with detecting device.
With respect to prior art, the input media of the utility model adjustable optical attenuator and output unit can be located at the same side, thereby make the product size miniaturization, and because of the trace variation reflection sensitivity of moving reflector to angle, and it is little influenced by environmental change, thereby reaches attenuation accuracy preferably.
[description of drawings]
Fig. 1 is the light path synoptic diagram of the utility model adjustable optical attenuator.
[embodiment]
Please refer to shown in Figure 1ly, the utility model adjustable optical attenuator 8 comprises input media 1, input detector 6, stationary mirror 2, moving reflector 3, drive unit 5, output unit 4 and output detector 7.In the present embodiment, this input detector 6 is a photodiode, and this output detector 7 is another photodiode, this photodiode 6,7 is all in order to provide detection signal, drive unit 5 receives the detection signal of this photoelectricity diode 6,7, with the angle of control moving reflector 3, thereby realize variable attenuation.
Input media 1 comprises two optical fiber parallel light tubes 13 of input and optical filter 10, and optical filter 10 is pasted on two optical fiber parallel light tube 13 1 ends of input, and this optical filter 10 has the partial reflection characteristic.Can reflect a certain amount of input optical signal.Wherein, two optical fiber parallel light tubes 13 further comprise first optical fiber 11 and second optical fiber 12, input optical signal is entered in the light path by first optical fiber 11, make the transmission of light signal part, partial reflection through optical filter 10, the ratio that the light signal of reflection accounts for input signal is 0.5%, and transfers to input photodiode 6 by second optical fiber 12.
The two optical fiber parallel light tube of stationary mirror 2 and input 13 is relative and form a special angle, through optical signals stationary mirror 2 surface reflections of optical filter 10 transmissions to moving reflector 3; And moving reflector 3 is oppositely arranged with stationary mirror 2, light signal from stationary mirror 2 reflections can be reflexed to output unit 4, wherein, drive unit 5 cooperates with moving reflector 3 to change the reflection paths of this moving reflector 3, and the light signal coupling amount that control enters output unit 4, to realize decay to light signal.
Output unit 4 comprises single fiber parallel light tube 41 and beam splitter 42, and single fiber parallel light tube 41 receives the light signal that is reflected from moving reflector 3, and with optical signal transmission to beam splitter 42; This beam splitter 42 can be with the light signal separated into two parts, and wherein a part accounts for from 9 8% of the light signal of parallel light tube 41, and this part optical signals is exported to outside the automatically controlled variable optical attenuator 8 by an output terminal 421 of beam splitter 42; The light signal of another part about 2% then exports output photodiode 7 to by another output terminal 422 of beam splitter 42, and the light signal that photodiode 7 receives this part can produce electric signal relatively with accessory drive 5.
Drive unit 5 receives input photodiode 6 and the detection electric signal of exporting photodiode 7 simultaneously, two detect electric signal represents light signal amount of importing and the light signal amount of exporting respectively after decaying, this detection pad value and predetermined attenuation value are relatively and send the control electric signal, and then adjustment drive unit 5, make moving reflector 3 corresponding change rotational angles, and reach the expection pad value.
Claims (6)
1. adjustable optical attenuator, it is characterized in that it comprises: an input media, one output unit, be arranged at least one moving reflector of input media and output unit light path, the drive unit of one control moving reflector position, and the detecting device that is coupled with drive unit, wherein, this input media further comprises two optical fiber parallel light tubes and optical filter, this optical filter is pasted on two optical fiber parallel light tube end faces, this pair optical fiber parallel light tube matches with detecting device, this output unit further comprises single fiber parallel light tube and beam splitter, and this beam splitter matches with detecting device.
2. adjustable optical attenuator according to claim 1 is characterized in that: wherein the reflectivity of this optical filter is 0.5%, and reflected light enters detecting device.
3. adjustable optical attenuator according to claim 1 is characterized in that: this strand-separating appts dual output end wherein, and output light ratio example is respectively 98% and 2%, and the output light of this 2% ratio enters detecting device.
4. adjustable optical attenuator according to claim 1, it is characterized in that: wherein this detecting device further comprises input detector and output detector, this input detector matches with two optical fiber parallel light tubes, and this output detector matches with the single fiber parallel light tube.
5. adjustable optical attenuator according to claim 1 is characterized in that: wherein the reflecting surface of this moving reflector and single fiber parallel light tube are oppositely arranged.
6. adjustable optical attenuator according to claim 1, it is characterized in that: wherein this moving reflector can freely rotate within the specific limits, light signal reflects at the reflecting surface of moving reflector, wherein has part optical signals to be coupled to the single fiber parallel light tube, and remainder then is attenuated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01256129 CN2546900Y (en) | 2001-10-05 | 2001-10-05 | Adjustable optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01256129 CN2546900Y (en) | 2001-10-05 | 2001-10-05 | Adjustable optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2546900Y true CN2546900Y (en) | 2003-04-23 |
Family
ID=33665142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01256129 Expired - Lifetime CN2546900Y (en) | 2001-10-05 | 2001-10-05 | Adjustable optical attenuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2546900Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333284C (en) * | 2003-10-20 | 2007-08-22 | 示创科技股份有限公司 | Optical pickup transmission apparatus |
| CN101283300B (en) * | 2004-10-19 | 2010-09-22 | 斯欧普迪克尔股份有限公司 | Optical detector configuration and utilization as feedback control in monolithic integrated optic and electronic arrangements |
-
2001
- 2001-10-05 CN CN 01256129 patent/CN2546900Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333284C (en) * | 2003-10-20 | 2007-08-22 | 示创科技股份有限公司 | Optical pickup transmission apparatus |
| CN101283300B (en) * | 2004-10-19 | 2010-09-22 | 斯欧普迪克尔股份有限公司 | Optical detector configuration and utilization as feedback control in monolithic integrated optic and electronic arrangements |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20111005 Granted publication date: 20030423 |