CN103969747A - Adjustable optical attenuator based on DLP and attenuator array - Google Patents
Adjustable optical attenuator based on DLP and attenuator array Download PDFInfo
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- CN103969747A CN103969747A CN201310034541.1A CN201310034541A CN103969747A CN 103969747 A CN103969747 A CN 103969747A CN 201310034541 A CN201310034541 A CN 201310034541A CN 103969747 A CN103969747 A CN 103969747A
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Abstract
The invention relates to the field of optical communication devices, and discloses an adjustable optical attenuator based on a DLP. The adjustable optical attenuator based on the DLP comprises an input and output unit, a beam expanding/contracting system and the DLP, wherein each micro reflector mirror of the DLP has the work states of two deflecting directions, the input and output unit is provided with an input port and an output port, the input light of the input port is expanded by the beam expanding/contracting system and then emitted to a micro reflector mirror array of the DLP, part of micro reflector mirrors reflect the corresponding light beam, then the light beam is contracted by the beam expanding/contracting system and then received and output by the output port of the input and output unit, the other micro reflector mirrors reflect the corresponding light beam, and the light beam deviates from the optical path and then is attenuated. According to the adjustable optical attenuator based on the DLP, the DLP is used for adjusting the direction of reflected light to adjust the attenuation amount of the light, not only is comprehensive optical performance of a traditional optical attenuator kept, but also the adjustable optical attenuator based on the DLP further has the advantages of being high in control accuracy, large in attenuation range, low in driving voltage, small in size, capable of integrating multiple channels easily, high in response speed, high in cost performance and the like.
Description
Technical field
The present invention relates to optical communication device field, relate in particular to a kind of adjustable optical attenuator and attenuator array based on DLP.
Background technology
Adjustable optical attenuator has a wide range of applications in optical communication, and its major function is for lowering or control light signal.The most basic characteristic of optical-fiber network should be adjustable, the particularly application in optical communication along with DWDM transmission system and EDFA, on a plurality of optical signal transmission passages, must carry out flat gain or channel power balanced, at optical receiver end, to carry out dynamically saturated control, in optical-fiber network, yet need other signal to control, these all make VOA become wherein indispensable Primary Component.
At present, VOA optical attenuator technology has polytype manufacturing technology, has adjustable mechanical formula technology, magneto-optic technology, liquid crystal technology, slab guide technology etc. all multi-form.
VOA should be able to accurately control the power of light signal, for all communication wavelengths provide stable attenuator; In extra long distance dwdm system, VOA also must respond to the signal gradually changing with environmental impact; On dynamic network node, the response time of VOA should be in ms level.The technical indicator of VOA mainly comprises: when operating wavelength range, dynamic range, insertion loss, Polarization Dependent Loss, response, ask, temperature characterisitic, working temperature etc.
Mechanical type optical attenuator is comparatively traditional solution, the optical attenuator of the type have technical maturity, good optical properties, filter with low insertion loss, Polarization Dependent Loss little, without advantages such as temperature controls; And its shortcoming is that volume is large, the many complex structures of assembly, response speed are not high, be difficult to automated production, be unfavorable for integrated etc.
Magneto-optical VOA is because magneto-optical crystal is subject to the impact of environment temperature on the change of light polarization, and temperature characterisitic is poor, needs temperature compensation.In addition, when the magnetization of magneto-optical crystal does not reach capacity, magneto-optical crystal the inside can produce many magnetic domains.The existence of magnetic domain causes the repeatable variation of the attenuating of adjustable optical attenuator, allows to the repeatability that keeps good, is also difficult to produce the smooth change of decay; Also, due to the existence of magnetic domain border surface scattering, make the more difficult control of decay.
Liquid crystal type VOA is because liquid crystal is easy to be subject to the impact of environment temperature, thereby temperature characterisitic is very poor, during use, need to be aided with temperature correction, and another shortcoming is that its response time when low temperature is very slow.
MZI shape planar optical waveguide VOA volume is little, be beneficial to highly integrated, but at present its technique is also in development and improvement, performance is also poor, encapsulation difficulty is large.EA type planar optical waveguide VOA requires very large to the change of carrier concentration, and modulation areas is very long, thus can increase volume and the power consumption of device, and this VOA is also temperature correlation.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of adjustable optical attenuator and attenuator array based on DLP, has that control accuracy is high, attenuation range is large, volume is little, is easy to the advantages such as hyperchannel is integrated.
For achieving the above object, the technical scheme that the present invention proposes is: a kind of adjustable optical attenuator based on DLP, comprises input-output unit, expand/contracting beam system and DLP; Each micro-reflector of described DLP all has the duty of two yawing moments; Described input-output unit has an input port and an output port, the input light of input port is irradiated on DLP micro reflector array after expand/contracting beam system expands, part micro-reflector receives output by the output port of input-output unit by its corresponding beam reflection afterwards by expand/contracting beam system contracting bundle, and another part micro-reflector departs from light path by its corresponding beam reflection and attenuates.
Further, described input-output unit be an optical circulator in conjunction with a collimating apparatus, or be a double-fiber collimator, or two single optical fiber calibrator combinations.
Further, described in expand/contracting beam system by two spherical lenses, formed, or two cylindrical mirrors form, or are comprised of spherical lens and non-spherical lens.
Another technical scheme of the present invention is: a kind of adjustable light attenuator array based on DLP, comprises input-output unit array, expand/contracting beam system and DLP; Each micro-reflector of described DLP all has the duty of two yawing moments; Each input-output unit of described input-output unit array all has an input port and an output port, the input light of each input port is irradiated to respectively in the zones of different of DLP micro reflector array after expand/contracting beam system expands, part micro-reflector receives output by the output port of former input-output unit by the beam reflection on it afterwards by expand/contracting beam system contracting bundle, and another part micro-reflector departs from light path by the beam reflection on it and attenuates.
Further, each input-output unit of described input-output unit array be an optical circulator in conjunction with a collimating apparatus, or be a double-fiber collimator, or two single optical fiber calibrator combinations.
Further, described in expand/contracting beam system by two spherical lenses, formed, or two cylindrical mirrors form, or are comprised of spherical lens and non-spherical lens.
Beneficial effect of the present invention is: adopt DLP accommodation reflex light direction to regulate the damping capacity of light, both kept the comprehensive optical property of traditional optical attenuator, and had that control accuracy is high, attenuation range is large, driving voltage is low, volume is little simultaneously, be easy to that hyperchannel is integrated, fast response time and cost performance advantages of higher.
Accompanying drawing explanation
Fig. 1 is the DLP structural representation that the present invention adopts;
Fig. 2 is the two states of DLP micro reflector array;
Fig. 3 is the structural representation of optical attenuator embodiment of the present invention;
Fig. 4 is the hot spot distribution schematic diagram of attenuator array on DLP.
Reference numeral: 1, input-output unit; 101, optical circulator; 102, collimating apparatus; 2, expand/contracting beam system; 3, DLP.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The DLP(Digital Light Procession that the present invention adopts) the digital micromirror elements DMD(Digital Micromirror Device of company's exploitation Digital Light Processor, its core WeiTI(Texas Instruments)).DMD is the reflection mirror array of a kind of minimum (several microns to tens microns), these micro mirrors are all suspending and can tilt to both sides 10 ~ 12 degree left and right, thereby can form the reflection of both direction, as illustrated in fig. 1 and 2, the state of each micro-reflector can pass through DLP(Digital Light Processor) independent control.
Be illustrated in figure 3 specific embodiments of the invention, the adjustable optical attenuator based on DLP, comprises input-output unit 1, expand/contracting beam system 2 and DLP 3.Wherein, each micro-reflector of DLP 3 all has the duty of two yawing moments; Input-output unit 1 has an input port and an output port, the input light of input port is irradiated on DLP 3 micro reflector arrays after expand/contracting beam system 2 expands, part micro-reflector is that 2 system contracting bundles receive output by the output port of input-output unit 1 afterwards by its corresponding beam reflection by expanding/contract bundle, and another part micro-reflector departs from light path by its corresponding beam reflection and attenuates.In this embodiment, input-output unit 1 is that an optical circulator 101 is in conjunction with a collimating apparatus 102, the incident light of optical circulator 101 inputs is expanded by expand/contracting beam system 2 after collimating apparatus 102 collimations, beam size is adjusted to the size that adapts to DLP 3, light beam after expanding is incident on DLP 3, the placement direction of DLP 3 is that the micro-reflector in state a on it can be returned to the incident light Yan Yuan road being irradiated on it, after expand/contracting beam system 2 contracting bundles, after collimating apparatus 102, enter optical circulator 101, by the output terminal of optical circulator 101, exported; Micro-reflector in state b departs from original optical path (as shown in phantom in Figure 3) by the incident light reflection being irradiated on it, thereby this part light is lost as attenuate light.The quantity of the micro-reflector by regulating and controlling in state a and state b, can control the luminous power that enters output terminal, realizes the adjusting of optical power attenuation degree.
If Fig. 4 is the hot spot distribution schematic diagram of the adjustable light attenuator array of embodiment based on DLP on DLP, four attenuator array of take are example, comprise input-output unit array array, expand/contracting beam system 2 and DLP 3 that four input-output units 1 form; Each micro-reflector of DLP 3 all has the duty of two yawing moments; Each input-output unit 1 of input-output unit array all has an input port and an output port, the input light of each input port is irradiated to respectively in the zones of different of DLP 3 micro reflector arrays after expand/contracting beam system 2 expands, part micro-reflector receives output by the output port of former input-output unit 1 by the beam reflection on it afterwards by expand/contracting beam system 2 contracting bundles, and another part micro-reflector departs from light path by the beam reflection on it and attenuates.As Fig. 4, the micro reflector array of whole DLP 3 is divided into four regions, the incident light of four input-output units 1 incides respectively on these four regions after expand/contracting beam system 2 expands, each region can be realized the function of an adjustable optical attenuator independently, so just can obtain four array adjustable optical attenuators.Similarly, can construct N array adjustable optical attenuator.It should be noted that the increase along with number of arrays, the micro-reflector decreased number in each region, this will make the regulating and controlling precise decreasing of each optical attenuator.
Input-output unit 1 in above-described embodiment can also adopt a double-fiber collimator, or two single optical fiber calibrator combinations; Expand/contracting beam system 2 is comprised of two spherical lenses, or two cylindrical mirrors composition, or is comprised of spherical lens and non-spherical lens.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but those skilled in the art should be understood that; within not departing from the spirit and scope of the present invention that appended claims limits; the various variations of in the form and details the present invention being made, are protection scope of the present invention.
Claims (6)
1. the adjustable optical attenuator based on DLP, is characterized in that: comprise input-output unit, expand/contracting beam system and DLP; Each micro-reflector of described DLP all has the duty of two yawing moments; Described input-output unit has an input port and an output port, the input light of input port is irradiated on DLP micro reflector array after expand/contracting beam system expands, part micro-reflector receives output by the output port of input-output unit by its corresponding beam reflection afterwards by expand/contracting beam system contracting bundle, and another part micro-reflector departs from light path by its corresponding beam reflection and attenuates.
2. the adjustable optical attenuator based on DLP as claimed in claim 1, is characterized in that: described input-output unit be an optical circulator in conjunction with a collimating apparatus, or be a double-fiber collimator, or two single optical fiber calibrator combinations.
3. the adjustable optical attenuator based on DLP as claimed in claim 1, is characterized in that: described in expand/contracting beam system by two spherical lenses, formed, or two cylindrical mirrors form, or are comprised of spherical lens and non-spherical lens.
4. the adjustable light attenuator array based on DLP, is characterized in that: comprise input-output unit array, expand/contracting beam system and DLP; Each micro-reflector of described DLP all has the duty of two yawing moments; Each input-output unit of described input-output unit array all has an input port and an output port, the input light of each input port is irradiated to respectively in the zones of different of DLP micro reflector array after expand/contracting beam system expands, part micro-reflector receives output by the output port of former input-output unit by the beam reflection on it afterwards by expand/contracting beam system contracting bundle, and another part micro-reflector departs from light path by the beam reflection on it and attenuates.
5. the adjustable optical attenuator based on DLP as claimed in claim 4, it is characterized in that: each input-output unit of described input-output unit array is that an optical circulator is in conjunction with a collimating apparatus, or be a double-fiber collimator, or two single optical fiber calibrator combinations.
6. the adjustable optical attenuator based on DLP as claimed in claim 4, is characterized in that: described in expand/contracting beam system by two spherical lenses, formed, or two cylindrical mirrors form, or are comprised of spherical lens and non-spherical lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310034541.1A CN103969747A (en) | 2013-01-30 | 2013-01-30 | Adjustable optical attenuator based on DLP and attenuator array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310034541.1A CN103969747A (en) | 2013-01-30 | 2013-01-30 | Adjustable optical attenuator based on DLP and attenuator array |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039915A (en) * | 2017-12-13 | 2018-05-15 | 武汉电信器件有限公司 | One kind cascade variable optical power unit fast synergistic control method and device |
| CN108240972A (en) * | 2016-12-23 | 2018-07-03 | 合肥美亚光电技术股份有限公司 | Fiber optic spectral multiplexing device and optical detection system |
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| US7817272B2 (en) * | 2008-06-09 | 2010-10-19 | Aegis Lightwave, Inc. | High-resolution spectrally adjustable filter |
| CN102150069A (en) * | 2008-08-15 | 2011-08-10 | 尼斯迪卡有限公司 | Spatial light modulator (SLM)-based optical attenuator |
| CN102150385A (en) * | 2008-08-21 | 2011-08-10 | 尼斯迪卡有限公司 | Optical channel monitor |
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2013
- 2013-01-30 CN CN201310034541.1A patent/CN103969747A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7817272B2 (en) * | 2008-06-09 | 2010-10-19 | Aegis Lightwave, Inc. | High-resolution spectrally adjustable filter |
| CN102150069A (en) * | 2008-08-15 | 2011-08-10 | 尼斯迪卡有限公司 | Spatial light modulator (SLM)-based optical attenuator |
| CN102150385A (en) * | 2008-08-21 | 2011-08-10 | 尼斯迪卡有限公司 | Optical channel monitor |
Non-Patent Citations (1)
| Title |
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| ZHI ZHONG,LIYUAN CHENG: "Optimization and analysis of variable fiber optic attenuator with DMD using ZEMAX", 《SPIE》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240972A (en) * | 2016-12-23 | 2018-07-03 | 合肥美亚光电技术股份有限公司 | Fiber optic spectral multiplexing device and optical detection system |
| CN108039915A (en) * | 2017-12-13 | 2018-05-15 | 武汉电信器件有限公司 | One kind cascade variable optical power unit fast synergistic control method and device |
| CN108039915B (en) * | 2017-12-13 | 2019-08-13 | 武汉电信器件有限公司 | A kind of cascade variable optical power unit fast synergistic control method and device |
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Application publication date: 20140806 |