CN109425980A - A kind of variable optical attenuator - Google Patents
A kind of variable optical attenuator Download PDFInfo
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- CN109425980A CN109425980A CN201710772909.2A CN201710772909A CN109425980A CN 109425980 A CN109425980 A CN 109425980A CN 201710772909 A CN201710772909 A CN 201710772909A CN 109425980 A CN109425980 A CN 109425980A
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- China
- Prior art keywords
- optical
- loophole
- plc
- optical path
- collimation lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
- G02B26/023—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light comprising movable attenuating elements, e.g. neutral density filters
Abstract
The present invention discloses a kind of variable optical attenuator, it includes double optical fiber head, PLC component, collimation lens and MEMS mirror, the PLC component has two or more optical paths, an at least optical path has opposite optical transmission direction with other optical paths, optical path of the incident light via the input optical fibre of double optical fiber head along a direction of PLC component is projected to collimation lens, collimation lens exports incident light collimation to MEMS mirror, the optical path of MEMS mirror reflection collimated light and the other direction along PLC component is projected to the output optical fibre of double optical fiber head, every optical path includes an entrance port, main exit portal and the one-to-two structure for separating loophole, main exit portal and separate loophole towards different directions export, the loophole that separates of every optical path posts a PD respectively, PD is for monitoring input optical power or Output optical power.
Description
Technical field
The present invention relates to optical communication device field more particularly to a kind of variable optical attenuators.
Background technique
MEMS Formula V OA is the important optical passive component of one of optical communication system, have the corresponding time it is fast, it is small in size,
The advantages that Insertion Loss is small can well adapt to fibre system miniaturization and integrated development trend.
Fig. 1 or Fig. 2 is the basic light path schematic diagram of the current more MEMS Formula V OA used, and 101 and 102 be input respectively
Optical fiber and output optical fibre, this two optical fiber form a double optical fiber head, and 103 be collimation lens, and 104 be MEMS mirror.Light from
Input optical fibre 101 inputs, and collimates, is then incident on MEMS mirror 104, MEMS mirror is light by collimation lens 103
Collimator lens 103 are reflected back, are transferred on output optical fibre 102 through lens focus.Fig. 1 is that light is coupled to output optical fibre completely
State on 102, Fig. 2 are the states that light is partly coupled on optical fiber 102.By adjusting the angle of reflecting mirror, can control defeated
The pad value of light and input light out.
But above scheme is due to being opened loop control, and after certain time works, attenuation accuracy cannot be guaranteed VOA, for example,
MEMS mirror making alive 40V when beginning, mirror rotate 0.5 degree, and attenuation is -15dB, but have passed through the operation of half a year, voltage
It is added to 40V, the circuit on mirror is since aging can only rotate 0.45 degree, and attenuation is -14dB, and front and back variable quantity greatly cannot very much
Meet the requirement of network.Have to be added additional luminous intensity monitoring to be thus made into a closed loop, as shown in Figure 3.
201,205 be PD, and 202,204 be spectroscope, and 203 be the MEMS formula variable optical attenuator of Fig. 1, and light is incident on one by input optical fibre
On a spectroscope 201, a part of light point is reflected on PD 201, and transmitted light is incident on MEMS Formula V OA, the light exported through VOA
It is incident on spectroscope 204, a part of light point is reflected on PD 205, and transmitted light is output on output optical fibre.It inputs so defeated
There is PD monitoring out, the decaying of PD 205 and PD 201 are output and the decaying of input light, even if MEMS mirror angle passes through
It crosses unstable after long-time, can also be adjusted by closed loop feedback that the two PD are formed.Knot of the Fig. 3 relative to Fig. 1 or Fig. 2
Structure, hence it is evident that volume is big very much.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of variable optical attenuators, realize closed loop feedback,
It can work long hours, and guarantee attenuation accuracy.
The technical solution adopted by the present invention is that:
A kind of variable optical attenuator comprising double optical fiber head, PLC component, collimation lens and MEMS mirror, the PLC component
With two or more optical paths, an at least optical path has opposite optical transmission direction with other optical paths, and incident light is via double light
Optical path of the input optical fibre of fine head along a direction of PLC component is projected to collimation lens, and incident light is collimated and exported by collimation lens
To MEMS mirror, the optical path of MEMS mirror reflection collimated light and the other direction along PLC component is projected to double optical fiber head
Output optical fibre, every optical path include an entrance port, main exit portal and the one-to-two structure for separating loophole, main exit portal and are separated
Loophole is exported towards different directions, and the loophole that separates of every optical path posts a PD respectively, and PD is for monitoring input optical power or defeated
Light power.
Further, the double optical fiber head is V-shaped slot structure.
Further, the collimation lens cylindrical mirror or spherical mirror.
Further, the MEMS mirror is one-dimensional rotation or two-dimensional rotary.
Further, the PLC component includes a PLC, and the PLC is etched with two optical paths, and every separating for optical path is penetrated
Mouth posts a PD respectively.
Further, the PD is generally the TO encapsulating structure PD of the big photosurface PD of sheet or included lens.
The invention adopts the above technical scheme, monitor output light and input light intensity, formed a feedback signal to
MEMS reflecting mirror still is able to work even if MEMS mirror applies voltage-angle in subsequent use and has certain variation
Stability and volume very little.Closed loop feedback can be achieved in the present invention, can work long hours, and guarantees that attenuation accuracy guarantees VOA.
Detailed description of the invention
The present invention is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is one of existing open loop type MEMS Formula V OA structural schematic diagram；
Fig. 2 is existing open loop type MEMS Formula V OA second structural representation；
Fig. 3 is existing closed loop MEMS Formula V OA structural schematic diagram；
Fig. 4 is a kind of structural schematic diagram of variable optical attenuator of the present invention；
Fig. 5 is a kind of structural schematic diagram of the PLC component of variable optical attenuator of the present invention.
Specific embodiment
As shown in Fig. 4 or Fig. 5, the invention discloses a kind of variable optical attenuators comprising double optical fiber head 1, PLC component 2,
Collimation lens 306 and MEMS mirror 307, the PLC component 2 have two or more optical paths, an at least optical path and other
Optical path has opposite optical transmission direction, and incident light is via the input optical fibre 301 of double optical fiber head 1 along a direction of PLC component 2
Optical path is projected to collimation lens 306, and collimation lens 306 exports incident light collimation to MEMS mirror 307, MEMS mirror
The optical path of 307 reflection collimated lights and the other direction along PLC component 2 is projected to the output optical fibre 302 of double optical fiber head 1, every light
Road includes an entrance port, main exit portal and the one-to-two structure for separating loophole, main exit portal and separates loophole towards different directions
The loophole that separates of output, every optical path posts a PD respectively, and PD is for monitoring input optical power or Output optical power.
Further, the double optical fiber head 1 is V-shaped slot structure.
Further, collimation lens 306 cylindrical mirror or the spherical mirror.
Further, the MEMS mirror 307 is one-dimensional rotation or two-dimensional rotary.
Further, the PLC component 2 includes a PLC 303, and the PLC 303 is etched with two optical paths, every optical path
The loophole that separates post a PD respectively.
Further, the PD is generally the TO encapsulating structure PD of the big photosurface PD of sheet or included lens.
Just concrete operating principle of the invention elaborates below:
Fig. 4 is a kind of light path schematic diagram of the invention, and the institute that can be realized the closed loop MEMS Formula V OA structure of Fig. 3 is functional,
But volume is much smaller.This two optical fiber of input optical fibre 301 and output optical fibre 302 form a double optical fiber heads, commonly use V-groove
Structure is made into double optical fiber head, and PLC component is made of PLC303, PD 304 and PD 305,.Light is inputted from input optical fibre 301, then
PLC 303 is reached, there are two optical path, every optical paths all to have the function of 1 point of 2 optical splitter by PLC.
Further, light transmits as described in Figure 5 in PLC, and light enters from entrance port 3031, is divided into main 3033 He of exit portal
3032 two-way of loophole is separated, wherein separate on the PD 304 in the light output to outside of loophole 3032, to monitor input optical power,
Separate that the light that loophole 3032 divides is generally very low, such as separating the light of loophole 3032 is the 1%(-20dB of entrance port 3031), remaining
99% Guang Yuanlu is transferred to main exit portal 3033.
The light of main exit portal 3033 exports downwards PLC303 and is transferred on collimation lens 306, quasi- by collimation lens 306
Directly, it is then incident on MEMS mirror 307, light is reflected back collimator lens 306 by MEMS mirror, is transmitted through lens focus
Onto output PLC 303.
Further, light enters from reversed entrance port 3034, is divided into and reversed separates loophole 3035 and reversed master goes out
3036 two-way of loophole, wherein on PD 305 in the reversed light output to outside for separating loophole 3035, to monitor input light function
Rate, the reversed generally very low such as reversed light for separating loophole 3035 of light that loophole 3035 divides that separates is reversed entrance port
3034 1%(-20dB), remaining 99% Guang Yuanlu is transferred to reversed main exit portal 3036, reversed main exit portal 3036
Light exports downwards PLC and on the output optical fibre 302 that is transferred in double optical fiber head.
PD 305 and PD 304 monitors the intensity of output light and input light respectively, and the ratio between corresponding current value of two PD is this
The attenuation of VOA device, so being capable of forming a feedback signal gives MEMS reflecting mirror, even if MEMS mirror makes subsequent
There is certain variation with middle application voltage-angle, still is able to guarantee the stability of VOA work, and volume very little.
The invention adopts the above technical scheme, it can be achieved that closed loop feedback, can work long hours, and guarantee that attenuation accuracy is protected
Demonstrate,prove VOA.
Claims (6)
1. a kind of variable optical attenuator, it is characterised in that: it includes double optical fiber head, PLC component, collimation lens and MEMS reflection
Mirror, the PLC component have two or more optical paths, and an at least optical path has opposite optical transmission direction with other optical paths,
Optical path of the incident light via the input optical fibre of double optical fiber head along a direction of PLC component is projected to collimation lens, and collimation lens will
The output of incident light collimation is to MEMS mirror, and MEMS mirror reflects collimated light and the optical path of the other direction along PLC component is penetrated
Out to the output optical fibre of double optical fiber head, every optical path includes an entrance port, main exit portal and the one-to-two structure for separating loophole,
It main exit portal and separates loophole and is exported towards different directions, the loophole that separates of every optical path posts a PD respectively, and PD is for monitoring
Input optical power or Output optical power.
2. a kind of variable optical attenuator according to claim 1, it is characterised in that: the double optical fiber head is V-shaped slot structure.
3. a kind of variable optical attenuator according to claim 1, it is characterised in that: the collimation lens cylindrical mirror or ball
Face mirror.
4. a kind of variable optical attenuator according to claim 1, it is characterised in that: the MEMS mirror one-dimensional rotation or
Two-dimensional rotary.
5. a kind of variable optical attenuator according to claim 1, it is characterised in that: the PLC component includes a PLC, institute
It states PLC and is etched with two optical paths, the loophole that separates of every optical path posts a PD respectively.
6. a kind of variable optical attenuator according to claim 1 or 5, it is characterised in that: the PD is the big photosurface of sheet
The TO encapsulating structure PD of PD or included lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710772909.2A CN109425980A (en) | 2017-08-31 | 2017-08-31 | A kind of variable optical attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710772909.2A CN109425980A (en) | 2017-08-31 | 2017-08-31 | A kind of variable optical attenuator |
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| CN109425980A true CN109425980A (en) | 2019-03-05 |
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| CN201710772909.2A Pending CN109425980A (en) | 2017-08-31 | 2017-08-31 | A kind of variable optical attenuator |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6374032B1 (en) * | 1999-04-22 | 2002-04-16 | Jds Uniphase Corporation | Variable optical attenuator |
| CN1602436A (en) * | 2001-10-24 | 2005-03-30 | 英特尔公司 | Variable optical attenuator |
| JP2006349827A (en) * | 2005-06-14 | 2006-12-28 | Nippon Telegr & Teleph Corp <Ntt> | Variable optical multiplexer/demultiplexer |
| CN2862063Y (en) * | 2005-09-14 | 2007-01-24 | 上海未来宽带技术及应用工程研究中心有限公司 | Light-changeable attenuator |
| US20080213904A1 (en) * | 2006-08-24 | 2008-09-04 | Sliwa John W | Monitoring drug compliance, food-intake or toxin-intake using non-invasively-read labels |
| US7492994B1 (en) * | 2003-01-08 | 2009-02-17 | Intelligent Fiber Optic Systems, Inc. | Integrated fiber tap monitor with variable optical attenuator |
| CN204347306U (en) * | 2015-01-06 | 2015-05-20 | 昂纳信息技术（深圳）有限公司 | With the adjustable optical attenuator of optical power detecting |
| CN204515188U (en) * | 2015-04-03 | 2015-07-29 | 福建华科光电有限公司 | A kind of adjustable optical attenuator with wavelength dependent loss compensation |
| CN204832242U (en) * | 2015-05-30 | 2015-12-02 | 浙江大学 | Three light path signal compensation systems among optics MEMS accelerometer |
-
2017
- 2017-08-31 CN CN201710772909.2A patent/CN109425980A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6374032B1 (en) * | 1999-04-22 | 2002-04-16 | Jds Uniphase Corporation | Variable optical attenuator |
| CN1602436A (en) * | 2001-10-24 | 2005-03-30 | 英特尔公司 | Variable optical attenuator |
| US7492994B1 (en) * | 2003-01-08 | 2009-02-17 | Intelligent Fiber Optic Systems, Inc. | Integrated fiber tap monitor with variable optical attenuator |
| JP2006349827A (en) * | 2005-06-14 | 2006-12-28 | Nippon Telegr & Teleph Corp <Ntt> | Variable optical multiplexer/demultiplexer |
| CN2862063Y (en) * | 2005-09-14 | 2007-01-24 | 上海未来宽带技术及应用工程研究中心有限公司 | Light-changeable attenuator |
| US20080213904A1 (en) * | 2006-08-24 | 2008-09-04 | Sliwa John W | Monitoring drug compliance, food-intake or toxin-intake using non-invasively-read labels |
| CN204347306U (en) * | 2015-01-06 | 2015-05-20 | 昂纳信息技术（深圳）有限公司 | With the adjustable optical attenuator of optical power detecting |
| CN204515188U (en) * | 2015-04-03 | 2015-07-29 | 福建华科光电有限公司 | A kind of adjustable optical attenuator with wavelength dependent loss compensation |
| CN204832242U (en) * | 2015-05-30 | 2015-12-02 | 浙江大学 | Three light path signal compensation systems among optics MEMS accelerometer |
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Application publication date: 20190305 |
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