CN105356938A - Detection apparatus of amplitude and frequency modulation signal - Google Patents
Detection apparatus of amplitude and frequency modulation signal Download PDFInfo
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- CN105356938A CN105356938A CN201510896055.XA CN201510896055A CN105356938A CN 105356938 A CN105356938 A CN 105356938A CN 201510896055 A CN201510896055 A CN 201510896055A CN 105356938 A CN105356938 A CN 105356938A
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Abstract
A detection apparatus of amplitude and frequency modulation signals comprises a detection module, a N*1 wavelength division multiplexing device, a high speed oscilloscope and a computer; the detection module comprises N paths of measuring circuits that have the same structure; each measuring circuit comprises a high speed photodiode, an electric signal amplifier, an amplitude modulator, a single longitudinal mode laser and an optical signal amplifier; the input end of each high speed photodiode is connected to signal light to be detected; the output end of each high speed photodiode is connected with the input end of one corresponding electric signal amplifier; the output end of each electric signal amplifier is connected with the modulation end of one corresponding amplitude modulator; the output end of each single longitudinal mode laser is connected with the modulated end of one corresponding amplitude modulator; the output end of each amplitude modulator is connected to the input end of one corresponding optical signal amplifier. According to the invention, the amplitude and frequency modulation signals can be detected and distinguished; the amplitude and frequency modulation signals of multiple monitoring points can be remotely and automatically detected and distinguished in real time, thereby reducing workload for the operation personnel greatly and raising detection efficiency of the amplitude and frequency modulation signals.
Description
Technical field
The present invention relates to amplitude-frequency modulation signal, particularly the checkout gear of amplitude-frequency modulation signal in a kind of laser signal.
Background technology
In high power laser light field, particularly be applied in the extensive superpower laser in inertial confinement fusion technology, in order to reduce hot spot impact, laser system end all employ beam shaping technology, also introduce the technology of Smoothing by Spectral Dispersion in front end simultaneously, these technology make laser frequency spectrum broadened, when broadened frequency spectrum transmits in extensive laser aid, due to the group velocity dispersion effect in optical fiber, and polarization maintaining optical fibre move back polarization phenomena, the factors such as the gain bandwidth also having gain media uneven, acting in conjunction makes broadened frequency spectrum in laser aid, receive uneven frequency spectrum transmitance impact, the light of different frequency is caused to have different transmitances in laser aid, thus the frequency modulation(FM) part that result in laser is converted to amplitude modulation(PAM), this phenomenon is called as the amplitude-frequency mudulation effect in superpower laser.
The operation of amplitude-frequency mudulation effect serious harm device of high power laser, so need to be detected in time and screen.Current prior art mainly concentrates on the compensation aspect of amplitude-frequency mudulation effect, such as patent " laser spectroscopy compensation arrangement " (application publication number: CN103995393A, application number: 201410219285.8), although can accurately compensate amplitude-frequency mudulation effect, solve the problem how compensating amplitude-frequency modulation, but about the need of compensation amplitude-frequency mudulation effect, and need the problem compensating how many amplitude-frequency mudulation effect, do not relate to technically.In addition, conventional monitoring means directly in laser aid, detects measured signal light, because measured signal light has broadened frequency spectrum, so in testing process, inevitably new amplitude-frequency mudulation effect can be introduced again after the Optical Fiber Transmission of distance long in checkout gear, the extra amplitude-frequency mudulation effect due to the Signal averaging that finally obtains, initial measured signal light checkout gear cannot being detected exactly produce in laser aid, if so adopt direct probe method, then cannot realize detecting amplitude-frequency modulation signal at a distance undistortedly, and substantially increase the cost of monitoring system, therefore, in practical operation, the personal experience that detection and the examination of amplitude-frequency modulation signal mainly rely on operating personnel artificially judges, there is detection accuracy low, detection range is little, operation easier is large, the problems such as the response time is slow.
Summary of the invention
The object of patent of the present invention is the checkout gear providing a kind of amplitude-frequency modulation signal, adopt suitable detection method, solve that the detection accuracy existed in current testing process is low, detection range is little, operation easier is large, the problem that response time is slow, realizes carrying out to the many places amplitude-frequency modulation signal in laser aid the function that detects Yu screen simultaneously.
The technical scheme of apparatus of the present invention is as follows:
A checkout gear for amplitude-frequency modulation signal, its feature is, comprises detecting module, N*1 wavelength division multiplexer, high-speed oscilloscope and computer;
Described detecting module is made up of the N road measuring circuit that structure is identical, every road measuring circuit comprises high-speed photodiode, electric signal amplifier, amplitude modulaor, single longitudinal mode laser and optical signal amplifier, flashlight is surveyed in the input reception of described high-speed photodiode, output is connected with the input of described electric signal amplifier, the output of this electric signal amplifier is connected with the modulated terminal of described amplitude modulaor, the output of described single longitudinal mode laser is connected with the modulated end of this amplitude modulaor, the output of this amplitude modulaor is connected to the input of described optical signal amplifier,
The output of the N number of optical signal amplifier in detecting module is connected with the input of described N*1 wavelength division multiplexer respectively, and the end of probe of the high-speed oscilloscope described in output termination of this N*1 wavelength division multiplexer, this high-speed oscilloscope is connected with computer by local area network (LAN).
The course of work of the checkout gear of amplitude-frequency modulation signal of the present invention is as follows:
The measured signal light at some monitoring points place enters into high-speed photodiode, the amplitude of high-speed photodiode response measured signal light, the waveform of the signal of telecommunication exported is similar with measured signal waveform, this signal of telecommunication amplifies through described electric signal amplifier, the signal of telecommunication after amplification is carried on amplitude modulaor as modulation signal, the output light of single longitudinal mode laser incides in amplitude modulaor as modulated light, light after amplitude modulaor modulation incides in optical signal amplifier, above process is the process that the measured signal light of each monitoring point will experience, the measured signal light of all N number of monitoring points enters N*1 wavelength division multiplexer by coupling fiber after said process, multichannel measured signal optocoupler is synthesized a road by this N*1 wavelength division multiplexer, the measured signal light on this road enters the end of probe of a high-speed oscilloscope, the data detected are transferred to computer by high-speed oscilloscope, by the data processing of computer, obtain the spectrogram of measured signal light, judge whether that there is amplitude-frequency mudulation effect by spectrogram, and judge the modulation depth of amplitude-frequency mudulation effect, thus the detection completed amplitude-frequency modulation signal and examination.
Compared with prior art, beneficial effect of the present invention is as follows:
1) high-speed photodiode is passed through, electric signal amplifier, amplitude modulaor, single longitudinal mode laser and optical signal amplifier form detecting module jointly, this detecting module utilizes single longitudinal mode laser to produce the communication band laser of a road single-frequency, the waveform that may be there is the measured signal light of amplitude-frequency mudulation effect by amplitude modulaor copies on this road single-frequency light undistortedly, because high-speed photodiode can not detect the spectrum component of measured signal light, so introduce the problem of extra amplitude-frequency mudulation effect after avoiding optical fiber long range propagation, ensure that the accuracy of detection.
2) by adopting the structure of N*1 wavelength division multiplexer, while reduction insertion loss, the remote detection function to many places measured signal light amplitude-frequency mudulation effect is achieved.
3) by adopting the combination of high-speed oscilloscope and computer, achieving light amplitude-frequency mudulation effect to measured signal and detecting automatically and quickly and the function of screening.
4) because the detection signal of many places shares a high-speed oscilloscope and a computer by N*1 wavelength division multiplexer, therefore the present invention also possesses the advantage that cost is lower, be beneficial to expansion.
Accompanying drawing explanation
Fig. 1 is the structural representation of the checkout gear of amplitude-frequency modulation signal of the present invention.
Fig. 2 is the workflow diagram of the checkout gear of amplitude-frequency modulation signal of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give concrete implementation method, but protection scope of the present invention is not limited to following embodiment.
Refer to Fig. 1, Fig. 1 is the structural representation of the checkout gear of amplitude-frequency modulation signal of the present invention, as shown in the figure, is made up of following components:
High-speed photodiode 1;
Electric signal amplifier 2;
Amplitude modulaor 3;
Wavelength is the single longitudinal mode laser 4 of 1550nm wave band; Why select 1550nm wave band, be because 1550nm wave band has the low advantage of non-dispersive, loss in Optical Fiber Transmission, and the Fibre Optical Communication Technology of present stage 1550nm wave band is comparatively ripe, commercial product is abundanter, so; Selecting 1550nm wave band, although this is good selection, is not unique selection.
Optical signal amplifier 5;
A N*1 wavelength division multiplexer 7;
A high-speed oscilloscope 8;
A computer 9.
High-speed photodiode 1, electric signal amplifier 2, amplitude modulaor 3, single longitudinal mode laser 4 and optical signal amplifier 5 form the detecting module 6 of this device, and its effect copies to communication band by undistorted for the waveform of measured signal light.
Fig. 2 is the workflow diagram of the checkout gear of amplitude-frequency modulation signal of the present invention, and as shown in the figure, first measured signal light incide in high-speed photodiode 1, completes the step of response amplitude in detecting module 6.Because high-speed photodiode 1 only responds the amplitude of incident light, so high-speed photodiode 1 can't respond the spectrum component of measured signal light, the wide spectrum that doing so avoids measured signal light produces again new amplitude-frequency mudulation effect in apparatus of the present invention, thus avoids the interference to result of detection.
Meanwhile, high-speed photodiode 1 is by undistorted for the waveform of the measured signal light of incidence the waveform being copied into the signal of telecommunication, and this signal of telecommunication amplifies through an electric signal amplifier 2.The signal of telecommunication after amplification is carried on amplitude modulaor 3 as modulation signal.Wavelength is that the continuous light that the single longitudinal mode laser 4 of 1550nm wave band exports enters the modulation that amplitude modulaor 3 accepts modulation signal, 1550nm wave band of laser after modulation is through an optical signal amplifier 5, light signal is carried out Linear Amplifer, is used for improving the sensitivity of acquisition of signal.By said process, achieve detecting module 6 by undistorted for measured signal waveform the effect copying to 1550nm wave band, complete the step of waveform copy.
In detecting module 6, the output light of N number of optical signal amplifier 5 incides in a N*1 wavelength division multiplexer 7 by optical fiber, and the effect of N*1 wavelength division multiplexer 7 is coupled light in an optical fiber by the measured signal of some roads 1550nm wave band to transmit.The measured signal light that all these monitoring points are detected is coupled in an optical fiber by N*1 wavelength division multiplexer 7, after N*1 wavelength division multiplexer 7 completes the step of wavelength division multiplexing, the output of N*1 wavelength division multiplexer 7 incides the end of probe of a high-speed oscilloscope 8 by an optical fiber, next the signal screening step in flow chart is entered, computer 9 accesses this high-speed oscilloscope 8 by local area network (LAN), the Wave data that high-speed oscilloscope 8 detects is transferred in computer 9, in the computer 9, Wave data is preserved in vector form, utilize these vectors of algorithm process afterwards, the signal of time domain is transformed to frequency domain, obtain the spectrogram that Wave data is corresponding, in the spectrogram obtained except the frequency needed, if also there is the frequency that other are extra, then think that measured signal light has amplitude-frequency mudulation effect, if there is no other extra frequencies, then think that measured signal light does not have amplitude-frequency mudulation effect.So far, this contrive equipment intactly achieves the function detected with screening amplitude-frequency modulation signal.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. a checkout gear for amplitude-frequency modulation signal, is characterized in that, comprises detecting module (6), N*1 wavelength division multiplexer (7), high-speed oscilloscope (8) and computer (9);
Described detecting module (6) is made up of the N road measuring circuit that structure is identical, every road measuring circuit comprises high-speed photodiode (1), electric signal amplifier (2), amplitude modulaor (3), single longitudinal mode laser (4) and optical signal amplifier (5), flashlight is surveyed in the input reception of described high-speed photodiode (1), output is connected with the input of described electric signal amplifier (2), the output of this electric signal amplifier (2) is connected with the modulated terminal of described amplitude modulaor (3), the output of described single longitudinal mode laser (4) is connected with the modulated end of this amplitude modulaor (3), the output of this amplitude modulaor (3) is connected to the input of described optical signal amplifier (5),
The output of the N number of optical signal amplifier (5) in detecting module (6) is connected with the input of described N*1 wavelength division multiplexer (7) respectively, the end of probe of the high-speed oscilloscope (8) described in output termination of this N*1 wavelength division multiplexer (7), this high-speed oscilloscope (8) is connected with computer (9) by local area network (LAN).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546340A (en) * | 2016-10-08 | 2017-03-29 | 中国科学院上海光学精密机械研究所 | Amplitude-frequency modulates the recognition methodss of laser signal |
| CN114072670A (en) * | 2019-04-05 | 2022-02-18 | H2Scan公司 | Method and system for determining a concentration of a target gas in a fluid environment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787040A (en) * | 1993-07-22 | 1995-03-31 | Clarion Co Ltd | Fm-am conversion demodulator |
| CN1844993A (en) * | 2006-02-17 | 2006-10-11 | 中国科学院上海光学精密机械研究所 | Amplitude Modulation Effect Compensation Device |
| CN201003945Y (en) * | 2007-01-24 | 2008-01-09 | 中国科学院上海光学精密机械研究所 | Online monitoring system capable of adjusting pole pitch of F-P interferometer |
| CN103995393A (en) * | 2014-05-22 | 2014-08-20 | 中国科学院上海光学精密机械研究所 | Laser spectrum compensation device |
| CN104678595A (en) * | 2015-02-09 | 2015-06-03 | 中国电子科技集团公司第二十三研究所 | Laser phase modulation method capable of effectively suppressing amplitude frequency effect |
-
2015
- 2015-12-07 CN CN201510896055.XA patent/CN105356938B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787040A (en) * | 1993-07-22 | 1995-03-31 | Clarion Co Ltd | Fm-am conversion demodulator |
| CN1844993A (en) * | 2006-02-17 | 2006-10-11 | 中国科学院上海光学精密机械研究所 | Amplitude Modulation Effect Compensation Device |
| CN201003945Y (en) * | 2007-01-24 | 2008-01-09 | 中国科学院上海光学精密机械研究所 | Online monitoring system capable of adjusting pole pitch of F-P interferometer |
| CN103995393A (en) * | 2014-05-22 | 2014-08-20 | 中国科学院上海光学精密机械研究所 | Laser spectrum compensation device |
| CN104678595A (en) * | 2015-02-09 | 2015-06-03 | 中国电子科技集团公司第二十三研究所 | Laser phase modulation method capable of effectively suppressing amplitude frequency effect |
Non-Patent Citations (3)
| Title |
|---|
| XUE L, WANG S, LI M, ET AL: "FM-to-AM conversion comparison of typical second-order phase modulation signals", 《INTERNATIONAL CONFERENCE ON INFORMATION SCIENCE AND TECHNOLOGY. IEEE》 * |
| 张琥杰, 周申蕾, 姜有恩, ET AL: "Analysis on FM-to-AM conversion induced by spatial filterin a high-power laser system", 《CHINESE OPTICS LETTERS》 * |
| 王先起, 廖胜, 黄建明: "扫描振镜幅频特性测试及位置标定的研究", 《光电工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546340A (en) * | 2016-10-08 | 2017-03-29 | 中国科学院上海光学精密机械研究所 | Amplitude-frequency modulates the recognition methodss of laser signal |
| CN106546340B (en) * | 2016-10-08 | 2018-12-25 | 中国科学院上海光学精密机械研究所 | The recognition methods of amplitude-frequency modulation laser signal |
| CN114072670A (en) * | 2019-04-05 | 2022-02-18 | H2Scan公司 | Method and system for determining a concentration of a target gas in a fluid environment |
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| CN105356938B (en) | 2017-09-12 |
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