CN105699954A - Optical domain reflection-based miniaturized tunable photoelectric time delay network structure - Google Patents
Optical domain reflection-based miniaturized tunable photoelectric time delay network structure Download PDFInfo
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- CN105699954A CN105699954A CN201410681601.3A CN201410681601A CN105699954A CN 105699954 A CN105699954 A CN 105699954A CN 201410681601 A CN201410681601 A CN 201410681601A CN 105699954 A CN105699954 A CN 105699954A
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Abstract
The invention belongs to the photon microwave signal processing technical field and provides an optical domain reflection-based miniaturized tunable photoelectric time delay network structure. The objective of the invention is to effectively reduce the size of a whole photoelectric delay network. According to the technical schemes of the invention, the optical domain reflection-based miniaturized tunable photoelectric time delay network structure comprises one or more time delay modules which are connected in series between an optical microwave signal input end and an optical microwave signal output end; each time delay module includes a circulator (1), an optical switch (2), time delay devices (3) and reflectors (4); input optical microwave signals are connected with the input end of the circulator (1); the bi-directional port of the circulator (1) is connected with the common port of the optical switch (2); two switchable ports of the optical switch (2) are respectively connected with the time delay devices (3) enabling different time delay length; one end of each time delay device (3) is connected with one reflector (4); and the output end of the circulator outputs optical microwave signals.
Description
Technical field
The invention belongs to photon microwave signal process technology, concrete will be a kind of in the miniaturization tunable optical electric delay network structural design of area of light reflection。
Background technology
Since 20 century 70s, phased array antenna technology (PAA) obtains in field of radar with the advantage of its uniqueness and uses widely。In order to realize the wideband wide scan of phased-array radar, it is necessary to use Real-time Delay (TTD) to realize the phase shift function in phased-array radar。Traditional Real-time Delay is made up of microwave waveguide and coaxial cable, is about a meter magnitude for massive phased array antenna, microwave waveguide or cable length, and the loss of broadband signal will have a strong impact on the performance of scanning system。Additionally, the delay unit volume and weight of pure electricity structure is all relatively big, limits it and use widely。It is in airborne and spaceborne application by it, phased-array radar little with greater need for volume, lightweight。
Light Real-time Delay technology (OTTD) is formed in the nineties and develops gradually, is widely used in optically controlled phased array antennas (OCPAA)。Its major technique thought is to be loaded on light wave by microwave signal, the optical signal of modulation is carried out delay operation, just can extract the microwave signal through time delay again through photodetector。OTTD technology overcomes the restriction of the instantaneous big bandwidth of tradition phased-array radar, and utilizes the characteristic of optical fiber low transmission loss, it is possible to achieve the long-range control of radar system。Additionally, optical fiber anti-electromagnetic interference capability is strong, good concealment, enhance stability and the operability of system。The phased array radar system adopting OTTD technology also has the advantages such as lightweight, volume is little。
Summary of the invention
Goal of the invention: a kind of miniaturization tunable optical electric delay network structure based on area of light reflection is provided, effectively reduces the volume of whole smooth electric delay network。
Technical scheme: a kind of miniaturization tunable optical electric delay network structure based on area of light reflection, including:
It is connected on one or more time delay modules between light microwave signal input and light microwave signal outfan；
Each time delay module includes: circulator (1), photoswitch (2), time delay device (3), reflecting mirror (4)；
Input light microwave signal connects circulator (1) input, and circulator (1) bidirectional port connects photoswitch (2) public port；(2) two changeable ports of photoswitch connect the different time delay devices of delay duration (3) respectively, the another port of each time delay device (3) connects a reflecting mirror (4), circulator (1) outfan output light microwave signal。
Beneficial effect:
1., by area of light catoptric arrangement, the branch and the He Lu that need two photoswitches to realize in traditional scheme can be completed with a photoswitch, it is possible to make the decreased number half of photoswitch。
2. by area of light catoptric arrangement, signal passes twice through time delay device, it is possible to make the amount of delay of the time delay device needed reduce half。
3. more than 2 coefficient as a result, it is possible to make the volume of whole time delay network less, more compact structure。
4, present invention can apply to airborne broadband active phased-array radar etc. has strict restriction to equipment volume, simultaneously need to the radio frequency field of detecting that works of big broadband (instant bandwidth) or photon microwave signal process field。
Accompanying drawing explanation
Fig. 1 is the miniaturization tunable optical electric delay network structure chart based on area of light reflection。
Fig. 2 is the miniaturization tunable optical electric delay network embodiment figure based on area of light reflection。
Detailed description of the invention
The present invention is based on the tunable optical electric delay network structural design of the miniaturization of area of light mirror structure, compact。System hardware as shown in Figure 1, 2, including:
It is connected on one or more time delay modules between light microwave signal input and light microwave signal outfan；
Each time delay module includes: circulator (1), photoswitch (2), time delay device (3), reflecting mirror (4)；
Input light microwave signal connects circulator (1) input, and circulator (1) bidirectional port connects photoswitch (2) public port；(2) two changeable ports of photoswitch connect the different time delay devices of delay duration (3) respectively, the another port of each time delay device (3) connects a reflecting mirror (4), circulator (1) outfan output light microwave signal。
Work process: light microwave signal inputs from circulator (1) input, from circulator (1) bidirectional port input optical switch (2) public port, the changeable port being then passed through photoswitch (2) exports reflecting mirror (4) from first time delay device or second time delay device, light microwave signal reflected light is switched (2) by reflecting mirror (4), public port again through photoswitch (2) returns circulator (1), exports light microwave signal to next stage from circulator (1) outfan afterwards。The time delay of each time delay module can be switched by photoswitch so that signal is realized by different time delay devices。And the amount of delay of whole time delay network can be obtained different amount of delay by the combination of multiple time delay modules。
The input of network, output signal is light microwave signal, is namely modulated at the microwave signal on optical signal。Whole time delay network can be obtained by the time delay module combination that 1,2 or multiple structure are similar, and the amount in relative time delay that different delayed time module realizes can be identical, it is also possible to is different。
Described optical circulator can also be realized by the combination of photo-coupler with isolator, and three port photocirculators can also be replaced by four-port photocirculator。
Described photoswitch is the device that optical signal can carry out physics switching, including mechanical optical switch, micro electro mechanical photoswitch (MEMS), liquid crystal optical switch, bubble photoswitch, thermo-optical switch, acoustooptic switch, magneto-optic shutter, electro-optical crystal switch, optically controlled optical switch etc.。The photoswitch of 1 × 2 can also be replaced by the photoswitch of 2 × 2 or n × m simultaneously。
Described time delay device is the device that optical signal can produce physical delays, including optical fiber, physical space, fiber waveguide, grating etc.。
Described reflecting mirror is the device that can make optical signal backtracking, including optical mirror, optical fiber end face reflector, fiber loop mirror etc.。
Below in conjunction with accompanying drawing with according to the embodiment that technical scheme completes, principles of the invention is described in further detail, the invention is not restricted to this embodiment。
Embodiment, 4bit tunable optical time delay network
As shown in Figure 2, after light microwave signal enters time delay network, first pass around an optical circulator, photoswitch is entered from the 2 of optical circulator mouthfuls of outputs, upper and lower light path is switched equally by magneto-optic shutter, by photoswitch then through by circulator 2 mouthfuls entrance after being reflected by fiber reflector, 3 mouthfuls of outputs realize time delay。Same, when photoswitch is switched to upper road, it is achieved bar path, when photoswitch is switched to lower road, then realize time delay through the time delay light path (round-trip delay is Δ t) of Δ t/2。
Whole time delay network is made up of the time delay module that 5 structures are similar, it is distinctive in that the time delay module amount of delay of each time delay module is different, respectively Δ t/2, Δ t, 2 Δ t, 4 Δ t, 8 Δ t, so can be produced time delay combinations different in the 32 of 0～31 Δ t by the various combination of optical switch status, concrete optical switch status is as shown in table 1 with the relation of time delay:
Table 1
The above is preferred embodiment, and its cost is minimum, system is the simplest。But not the present invention is done any pro forma restriction, above-described embodiment is made any simple modification, equivalent variations and modification, belongs in the scope of technical solution of the present invention。
Claims (1)
1. the miniaturization tunable optical electric delay network structure based on area of light reflection, it is characterised in that including:
It is connected on one or more time delay modules between light microwave signal input and light microwave signal outfan；
Each time delay module includes: circulator (1), photoswitch (2), time delay device (3), reflecting mirror (4)；
Input light microwave signal connects circulator (1) input, and circulator (1) bidirectional port connects photoswitch (2) public port；(2) two changeable ports of photoswitch connect the different time delay devices of delay duration (3) respectively, the another port of each time delay device (3) connects a reflecting mirror (4), circulator (1) outfan output light microwave signal。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106200021A (en) * | 2016-07-18 | 2016-12-07 | 中国科学院半导体研究所 | The tunable broadband of miniaturization steady phase fibre delay line |
| CN107632347A (en) * | 2017-10-31 | 2018-01-26 | 天津大学 | A kind of optical delay line of big amount of delay continuously adjustabe |
| CN112558053A (en) * | 2020-10-28 | 2021-03-26 | 电子科技大学 | Optical beam forming network device and method based on microwave photon true time delay |
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| CN102353523A (en) * | 2011-06-24 | 2012-02-15 | 中国科学院上海光学精密机械研究所 | Measuring device of noise characteristics of laser |
| CN102662288A (en) * | 2012-05-16 | 2012-09-12 | 中国计量学院 | Device for repeatedly filtering pulsed light |
| CN103941235A (en) * | 2014-02-26 | 2014-07-23 | 上海交通大学 | Full-optical-control phased-array radar transmitter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7369721B2 (en) * | 2003-09-26 | 2008-05-06 | Mbda Uk Limited | Optical imaging system with optical delay lines |
| CN101571612A (en) * | 2004-02-02 | 2009-11-04 | 中国科学技术大学 | Polarization controlling encoding method, encoder and quantum key dispatching system |
| CN102353523A (en) * | 2011-06-24 | 2012-02-15 | 中国科学院上海光学精密机械研究所 | Measuring device of noise characteristics of laser |
| CN102662288A (en) * | 2012-05-16 | 2012-09-12 | 中国计量学院 | Device for repeatedly filtering pulsed light |
| CN103941235A (en) * | 2014-02-26 | 2014-07-23 | 上海交通大学 | Full-optical-control phased-array radar transmitter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106200021A (en) * | 2016-07-18 | 2016-12-07 | 中国科学院半导体研究所 | The tunable broadband of miniaturization steady phase fibre delay line |
| CN106200021B (en) * | 2016-07-18 | 2019-02-15 | 中国科学院半导体研究所 | Minimize the steady phase fibre delay line in tunable broadband |
| CN107632347A (en) * | 2017-10-31 | 2018-01-26 | 天津大学 | A kind of optical delay line of big amount of delay continuously adjustabe |
| CN107632347B (en) * | 2017-10-31 | 2019-08-16 | 天津大学 | A kind of optical delay line that big amount of delay is continuously adjustable |
| CN112558053A (en) * | 2020-10-28 | 2021-03-26 | 电子科技大学 | Optical beam forming network device and method based on microwave photon true time delay |
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