CN102664679A - Arrayed photoelectric detector in wireless laser communication device - Google Patents
Arrayed photoelectric detector in wireless laser communication device Download PDFInfo
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- CN102664679A CN102664679A CN2012101021985A CN201210102198A CN102664679A CN 102664679 A CN102664679 A CN 102664679A CN 2012101021985 A CN2012101021985 A CN 2012101021985A CN 201210102198 A CN201210102198 A CN 201210102198A CN 102664679 A CN102664679 A CN 102664679A
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Abstract
The invention discloses an arrayed photoelectric detector in a wireless laser communication device, belonging to the technical field of wireless laser communication. In consideration of a restriction relation among a frequency response bandwidth, a photosensitive surface area and an eyesight diaphragm, the prior art requires the existence of a precise mechanical servo tracking system. According to the invention, a transimpedance detector is formed by a photosensitive element P and a sampling resistor R0 which are connected in series; a detected optical power voltage signal is amplified by a prepositioned amplifier and a master amplifier in turns; a plurality of the photosensitive elements P are arrayed to form a photosensitive element array; each photosensitive element P together with one sampling circuit R0 forms one transimpedance detector; and each transimpedance detector is connected with the prepositioned amplifier; an output end of each prepositioned amplifier is divided into two paths to be respectively connected with a multipath A/D (analogue-to-digital) sampler and a multipath gating device; a controller is connected between the multipath A/D sampler and the multipath gating device; and the output end of the multipath gating device is connected with the main amplifier. The detector is applied to a portable wireless laser communication system, realizes synchronous receiving and tracking of laser communication signals, and adopts a photoelectric tracking way.
Description
Technical field
The present invention relates to the array photodetectors in a kind of wireless laser communication device, belong to the wireless laser communication technical field.
Background technology
Wireless laser communication is meant with laser wave as the optical communication as transmission medium of carrier wave, atmosphere.Compare characteristics such as laser communication has that information capacity is big, bandwidth, anti-electromagnetic interference capability are strong, good confidentiality with microwave communication.Compare with optical fiber communication with wired, have maneuverability, little to urban construction influence, operating cost is low, be easy to advantage such as popularization.Laser communication does not take Radio Spectrum Resource, does not need the demand frequency license, does not have tubing need excavate the problem of road, sets up flexibly, can accomplish ground-to-ground, ground-to-air, air to air wait the multiple optical fiber communication can't the traffic carried task.
Radio telecommunicaltion system mainly partly is made up of laser transmitting system, laser receiver system, servo tracking system etc.The device of the core the most in the laser receiver system is a photodetector; The frequency response bandwidth of photodetector and the photosurface area of photosensitive unit are inversely proportional to; If require the frequency response bandwidth wideer, then the photosurface area just should be littler, has only tens microns to several millimeters like the photosurface diameter.Yet; According to geometric optics, the field stop of laser receiver system is the photosurface of the photosensitive unit of photodetector, therefore; Improve the frequency response bandwidth through the photosurface area that reduces photodetector and must cause the field stop of laser receiver system to diminish, it is also just inevitable very little to receive the visual field.Yet it is more little high more to the requirement of following the tracks of alignment system to receive the visual field, and this just causes laser receiver system to rely on servo tracking system strongly.
And existing servo tracking system is used for a formula radio telecommunicaltion system; This servo tracking system is bulky, heavy, complex structure is accurate, with high costs; In addition; Owing to this servo tracking system bigger machinery inertial in tracing process produces less mechanical bandwidth, and then cause the control bandwidth of radio telecommunicaltion system and control precision to reduce.In addition this mechanical type aligning tracking mode is difficult to be fit to the portable wireless laser communication system.In fact existing portable wireless laser communication system can only rely on and see collimation device aligning and tracking; In view of the relation between frequency response bandwidth mentioned above, photosurface area, the field stop three; See the normal reception that collimation device is difficult to guarantee communicate optical signal, optical communication is difficult to normally carry out.
Photodetector in the existing radio telecommunicaltion system constitutes by striding resistance detector, preamplifier, main amplifier; See shown in Figure 1; Photosensitive unit and sampling resistor constitute strides the resistance detector, and the luminous power voltage signal that detects is amplified by preamplifier, main amplifier successively.
Summary of the invention
The objective of the invention is to solve the aligning tracking problem of portable wireless laser communication system; We have invented the array photodetectors in a kind of wireless laser communication device for this reason; This array photodetectors can be aimed at the aligning tracking that tracking mode realizes the portable wireless laser communication system with the on-mechanical formula; And then the normal reception of realization communicate optical signal; When increasing the laser receiver system field stop, keep or reduce the photosurface area of the photosensitive unit of photodetector, keep or improve the frequency response bandwidth of photodetector.
Array photodetectors in the present invention's the wireless laser communication device is connected with sampling resistor R0 to constitute by photosensitive first P and is striden the resistance detector; The luminous power voltage signal that detects is amplified by preamplifier, main amplifier successively; It is characterized in that; See shown in Figure 2ly, some photosensitive first P arrange and constitute photosensitive element array, and each photosensitive first P constitutes one with a sampling resistor R0 respectively and strides the resistance detector; Each is striden the resistance detector and connects a preamplifier respectively; Each preamplifier output divides two-way to be connected with multi-channel A/D sampler, multi-channel gating device respectively, and controller is connected between multi-channel A/D sampler, the multi-channel gating device, and the multi-channel gating device output connects main amplifier.
Its technique effect of the present invention is; Adopt the wireless laser communication device of the present invention's array photodetectors to aim at and follow the tracks of, make photosensitive element array detect communication laser, which photosensitive first P to detect communication laser by no matter specifically be by seeing collimation device; The resistance detector of striding by correspondence is sent the luminous power voltage signal into its preamplifier amplification; The luminous power voltage signal one tunnel of each preamplifier output gets into multi-channel A/D sampler, a tunnel and gets into multi-channel gating device, and by controller control, multi-channel A/D sampler carries out the output level circulating sampling to the preamplifier of all accesses; And sampled result sent into controller; Search the high person of luminous power at this process middle controller, confirm in photosensitive element array that just which photosensitive first P is the ceiling capacity zone, instruct multi-channel gating device that the photosensitive detection output of this photosensitive first P signal is enabled control again; Signal of communication to this photosensitive first P collected is adjudicated, and delivers to main amplifier and further amplify.In view of this, adopt the present invention's array photodetectors that the reception of laser communication signal is carried out with tracking simultaneously, tracking wherein becomes a kind of photoelectric tracking mode, has been completely free of the existing machinery tracking mode.Adopt the radio telecommunicaltion system of the present invention's array photodetectors need not be equipped with special servo tracking system, only need to keep the sight collimation device and get final product.In addition, having adopted the field stop of laser receiver system of the present invention's array photodetectors is the photosurface of photosensitive element array, and this photosurface is obviously greater than the photosurface of single photosensitive first P; So the field stop of the laser receiver system of employing the present invention's array photodetectors obviously increases, receive the visual field and therefore obviously increase; But the frequency response bandwidth of this array photodetectors does not reduce; Because the final laser communication signal that obtains is provided by a photosensitive first P in addition, and in scheme of the present invention; The photosurface area of this photosensitive first P does not increase, and remains unchanged usually or reduces.
Because the present invention's array photodetectors is taked the working method of luminous power Gao Zhetong, therefore can not add up and influence the frequency response bandwidth because of the junction capacitance that parallel connection caused of a plurality of photosensitive first P.
Description of drawings
Fig. 1 is the photodetector structure sketch map in the existing laser communication system.Fig. 2 is the array photodetectors structural representation in the wireless laser communication device of the present invention, and this figure is simultaneously as Figure of abstract.Fig. 3 is the photosensitive element array structural representation in the present invention's the array photodetectors.Fig. 4 is that striding in the photodetector in the laser communication system hindered detector and preamplifier circuit figure.
Embodiment
Array photodetectors in the present invention's the wireless laser communication device is connected with sampling resistor R0 to constitute by photosensitive first P and is striden the resistance detector, and the luminous power voltage signal that detects is amplified by preamplifier, main amplifier successively, sees shown in Figure 2.Some photosensitive first P are arranged in and constitute photosensitive element array on the metal substrate 1; Photosensitive first P quantity is 2 * 2～10 * 10; As 6 * 6, see shown in Figure 3ly, isolate by air channels 2 electricity between each photosensitive first P; Metal substrate 1 can reduce the static noise of array photodetectors simultaneously as the common ground of each photosensitive first P.One of concrete scheme of photosensitive element array is to be arranged as photosensitive first P by several discrete component photodiodes to form, two be on same wafer, to adopt the integrated manufacturing of process for fabrication of semiconductor device.Each photosensitive first P connects with a sampling resistor R0 respectively through signal lead 3 and constitutes one and stride the resistance detector, and each is striden the resistance detector and connects a preamplifier respectively, sees Fig. 2, shown in Figure 4.The particular circuit configurations and the function of striding resistance detector and preamplifier are following, and the PN junction of photosensitive first P is anti-inclined to one side, meet a sampling resistor R0 at the back, and the response frequency of its resistance and preamplifier is inversely proportional to, generally at several ohm between hundreds of ohm; When the photosurface of photosensitive first P receives the communication laser radiation and when exciting; Inspire electron stream from its PN junction; Electron stream is behind sampling resistor R0, and current signal is converted into ac voltage signal, and this ac voltage signal is sent to preamplifier through capacitance C1 and amplifies; Preamplifier by two to the pipe VT1, VT2 forms, and is a kind of low noise high power amplifying circuit; Resistance R 1 constitutes bleeder circuit with resistance R 2, realizes the stable of quiescent point; For the frequency bandwidth characteristics of the preamplifier that extends, do negative feedback through resistance R 8 and 4 pairs of primes of capacitor C; Resistance R 3～R7 realizes that ballast exchanges amplification with non-linear; The luminous power voltage signal one tunnel that amplifies through preamplifier gets into multi-channel A/D sampler, one tunnel entering multi-channel gating device.Each preamplifier output divides two-way to be connected with multi-channel A/D sampler, multi-channel gating device respectively, and controller is connected between multi-channel A/D sampler, the multi-channel gating device, and the multi-channel gating device output connects main amplifier.Multi-channel A/D sampler is counted the A/D chip by multichannel and is taken on; Controller is a microprocessor, is taken on by a dsp chip or singlechip chip; Multi-channel gating device is taken on by the triple gate chip.
Claims (4)
1. the array photodetectors in the wireless laser communication device; Connected with sampling resistor R0 to constitute by photosensitive first P and stride the resistance detector, the luminous power voltage signal that detects is amplified by preamplifier, main amplifier successively, it is characterized in that; Some photosensitive first P arrange and constitute photosensitive element array; Each photosensitive first P constitutes one with a sampling resistor R0 respectively and strides the resistance detector, and each is striden the resistance detector and connects a preamplifier respectively, and each preamplifier output divides two-way to be connected with multi-channel A/D sampler, multi-channel gating device respectively; Controller is connected between multi-channel A/D sampler, the multi-channel gating device, and the multi-channel gating device output connects main amplifier.
2. the array photodetectors in the wireless laser communication device according to claim 1; It is characterized in that; Some photosensitive first P are arranged in metal substrate (1) and go up the photosensitive element array of formation; Photosensitive first P quantity is 2 * 2～10 * 10, is isolated by air channels (2) electricity between each photosensitive first P, and metal substrate (1) while is as the common ground of each photosensitive first P.
3. the array photodetectors in the wireless laser communication device according to claim 1; It is characterized in that; One of concrete scheme of photosensitive element array is to be arranged as photosensitive first P by several discrete component photodiodes to form, two be on same wafer, to adopt the integrated manufacturing of process for fabrication of semiconductor device.
4. the array photodetectors in the wireless laser communication device according to claim 1 is characterized in that, multi-channel A/D sampler is counted the A/D chip by multichannel and taken on; Controller is a microprocessor, is taken on by a dsp chip or singlechip chip; Multi-channel gating device is taken on by the triple gate chip.
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| CN201210102198.5A CN102664679B (en) | 2012-04-10 | 2012-04-10 | Arrayed photoelectric detector in wireless laser communication device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820197A (en) * | 2015-05-01 | 2015-08-05 | 武汉中科波谱技术有限公司 | Pre-posed amplification system for nuclear magnetic resonance spectrometer or imaging instrument |
| CN109659805A (en) * | 2018-12-11 | 2019-04-19 | 武汉邮电科学研究院有限公司 | A kind of tunable laser |
| CN111953416A (en) * | 2020-07-24 | 2020-11-17 | 西安理工大学 | Automatic indoor visible light communication alignment system based on photoresistor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130028Y (en) * | 2007-12-07 | 2008-10-08 | 天津国品光电技术有限公司 | Optical fibre grating sensor demodulation instrument |
| CN101706253A (en) * | 2009-11-26 | 2010-05-12 | 重庆师范大学 | Filtering phase discriminator type dynamic interferometry system |
| CN202066593U (en) * | 2011-05-13 | 2011-12-07 | 卢利根 | Ultraviolet spectrum measuring system based on photomultiplier tube array |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130028Y (en) * | 2007-12-07 | 2008-10-08 | 天津国品光电技术有限公司 | Optical fibre grating sensor demodulation instrument |
| CN101706253A (en) * | 2009-11-26 | 2010-05-12 | 重庆师范大学 | Filtering phase discriminator type dynamic interferometry system |
| CN202066593U (en) * | 2011-05-13 | 2011-12-07 | 卢利根 | Ultraviolet spectrum measuring system based on photomultiplier tube array |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820197A (en) * | 2015-05-01 | 2015-08-05 | 武汉中科波谱技术有限公司 | Pre-posed amplification system for nuclear magnetic resonance spectrometer or imaging instrument |
| CN109659805A (en) * | 2018-12-11 | 2019-04-19 | 武汉邮电科学研究院有限公司 | A kind of tunable laser |
| CN111953416A (en) * | 2020-07-24 | 2020-11-17 | 西安理工大学 | Automatic indoor visible light communication alignment system based on photoresistor |
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