CN116858503B - Narrow pulse optical power measurement system and method - Google Patents
Narrow pulse optical power measurement system and method Download PDFInfo
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- CN116858503B CN116858503B CN202311121724.7A CN202311121724A CN116858503B CN 116858503 B CN116858503 B CN 116858503B CN 202311121724 A CN202311121724 A CN 202311121724A CN 116858503 B CN116858503 B CN 116858503B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 195
- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 84
- 230000008054 signal transmission Effects 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 17
- 239000000919 ceramic Substances 0.000 claims description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4238—Pulsed light
Abstract
The invention relates to a narrow pulse optical power measurement system and a method, wherein the system comprises a high-speed pulse optical power sampling device and a display device, and the high-speed pulse optical power sampling device comprises a pulse constant current source module, a voltage detection module, an optical signal transmission module, a control module and a sampling module; the control module sends an enabling signal to the pulse constant current source module, controls the pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and duty ratio to the laser to be tested, drives the laser to be tested to generate a high-speed pulse optical power signal, transmits the signal to the sampling module, samples the high-speed pulse optical power signal, converts the sampled signal into an optical power digital signal and then outputs the optical power digital signal to the display device, and the display device draws a P-I characteristic curve and displays the P-I characteristic curve; the invention tests the optical power of the laser by the high-speed narrow pulse current with adjustable amplitude and duty ratio, and can rapidly and accurately measure the P-I curve without external constant temperature equipment.
Description
Technical Field
The invention relates to the technical field of laser testing, in particular to a narrow pulse optical power measuring system and a method.
Background
In industrial laser testing application, it is often necessary to quickly and accurately measure optical power, where the current at the inflection point of the measured P-I (optical power-current) characteristic curve is a threshold current, and the corresponding power is the threshold optical power, where the threshold current is a key parameter of the laser diode and is a critical point of passive light emission and active light emission of the laser, so that it has great significance to accurately measure the optical power before and after the threshold current; however, the P-I characteristic of the laser is very sensitive to temperature change, the higher the temperature is, the larger the threshold current is, and the wavelength of the output light of the laser is slightly changed, so that the LD laser tube needs to be kept at a constant temperature in the process of testing the P-I characteristic curve.
At present, constant temperature equipment is required to keep the laser tube constant temperature when the optical power measurement is carried out, so that a system capable of rapidly and accurately measuring the optical power without keeping the laser tube constant temperature is needed to be provided.
Disclosure of Invention
In view of the foregoing, there is a need for a narrow pulse optical power measurement system and method that solves the technical problem of how to quickly and accurately measure optical power of a laser without the aid of a thermostatic device.
In order to solve the problems, the invention provides a narrow pulse optical power measurement system, which comprises a high-speed pulse optical power sampling device and a display device, wherein the high-speed pulse optical power sampling device comprises a pulse constant current source module, a voltage detection module, an optical signal transmission module, a control module and a sampling module;
the control module is respectively connected with the display device, the pulse constant current source module and the sampling module, the pulse constant current source module is connected with the optical signal transmission module, and the optical signal transmission module is connected with the sampling module;
the control module is used for sending an enabling signal to the pulse constant current source module and sending a bias voltage control signal to the sampling module according to the test requirement;
the pulse constant current source module is used for outputting high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be tested according to the enabling signal so as to drive the laser to be tested to generate a high-speed pulse optical power signal;
the optical signal transmission module is used for transmitting the high-speed pulse optical power signal to the sampling module;
the sampling module is used for sampling the high-speed pulse optical power signal according to the bias voltage control signal, converting the sampled signal into an optical power digital signal and outputting the optical power digital signal to the control module;
the voltage detection module is used for detecting the voltage of the laser to be detected, obtaining voltage data and sending the voltage data to the control module;
the control module is also used for transmitting the optical power digital signal, the voltage data and the pulse current to the display device;
the display device is used for drawing and displaying a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal.
Optionally, the optical signal transmission module comprises an integrating sphere and an optical fiber bundle;
the integrating sphere is used for receiving the high-speed pulse optical power signal and carrying out diffuse reflection attenuation on the high-speed pulse optical power signal;
the optical fiber bundle is used for transmitting the high-speed pulse optical power signal subjected to diffuse reflection attenuation to the sampling module.
Optionally, the integrating sphere is composed of two hemispheres, and comprises a light inlet and a light outlet;
the laser to be tested is provided with the light inlet, the optical fiber bundle is arranged at the light outlet, and the inner wall of the integrating sphere is coated with the diffusion layer.
Optionally, the diffusion layer is white matte barium sulfate.
Optionally, the optical fiber bundle consists of a ceramic ferrule, a nut and a single-buckle tube;
the single-buckle pipe is coated outside the ceramic ferrule, the ceramic ferrule is connected with the light outlet of the integrating sphere through a connector and the nut, and the ceramic ferrule is connected with the sampling module through the nut.
Optionally, the ferrule is formed by arranging a plurality of optical fiber monofilaments in layers according to a corresponding sequence.
Optionally, the sampling module comprises a photoelectric detector, a transimpedance amplifier, a high-speed pulse signal processing circuit, a high-speed ADC sampling circuit and a bias voltage source;
the photoelectric detector is respectively connected with the bias voltage source, the optical signal transmission module and the transimpedance amplifier, the transimpedance amplifier is connected with the high-speed pulse signal processing circuit, the high-speed pulse signal processing circuit is connected with the high-speed ADC sampling circuit, the high-speed ADC sampling circuit is connected with the control module, and the bias voltage source is connected with the control module;
the bias voltage source is used for generating low-noise bias voltage according to the bias voltage control signal sent by the control module and outputting the low-noise bias voltage to the photoelectric detector;
the photoelectric detector is used for receiving the high-speed pulse optical power signal, is driven by the low-noise bias voltage, converts the high-speed pulse optical power signal into a high-speed pulse current signal and outputs the high-speed pulse current signal to the transimpedance amplifier;
the transimpedance amplifier is used for converting the high-speed pulse current signal into a high-speed pulse voltage signal and outputting the high-speed pulse voltage signal to the high-speed pulse signal processing circuit;
the high-speed pulse signal processing circuit is used for processing the high-speed pulse voltage signal and outputting the processed high-speed pulse voltage signal to the high-speed ADC sampling circuit;
the high-speed ADC sampling circuit is used for converting the processed high-speed pulse voltage signal into an optical power digital signal and outputting the optical power digital signal to the control module.
Optionally, the voltage detection module is a voltmeter.
Further, the invention also provides a narrow pulse optical power measurement method, which is applied to the narrow pulse optical power measurement system, and the method comprises the following steps:
generating an enabling signal and a bias voltage control signal through a control module according to the test requirement;
according to the enabling signal, controlling a pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be tested so as to drive the laser to be tested to generate a high-speed pulse optical power signal;
transmitting the high-speed pulse optical power signal to a sampling module through an optical signal transmission module;
controlling the sampling module to sample the high-speed pulse optical power signal according to the bias voltage control signal, and converting the sampled signal into an optical power digital signal;
detecting the voltage of the laser to be detected through a voltage detection module to obtain voltage data;
and drawing a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal, and displaying the V-I characteristic curve and the P-I characteristic curve through a display device.
Optionally, the transmitting the high-speed pulse optical power signal to the sampling module by the optical signal transmission module includes:
transmitting the high-speed pulse optical power signal to the sampling module through an integrating sphere and an optical fiber bundle;
the high-speed pulse optical power signal is transmitted as high-speed narrow pulse peak optical power.
The beneficial effects of the invention are as follows: the invention provides a narrow pulse optical power measurement system which comprises a high-speed pulse optical power sampling device and a display device, wherein the high-speed pulse optical power sampling device comprises a pulse constant current source module, a voltage detection module, an optical signal transmission module, a control module and a sampling module; the control module is used for controlling the pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and duty ratio to the laser to be tested so as to drive the laser to be tested to generate a high-speed pulse optical power signal, the optical signal transmission module is used for transmitting the high-speed pulse optical power signal to the sampling module, the sampling module is used for sampling the high-speed pulse optical power signal, the sampled signal is converted into an optical power digital signal and then is output to the control module, voltage detection is carried out on the basis of the voltage detection module to obtain voltage data, and the control module is used for outputting the pulse current, the voltage data and the optical power digital signal to the display device so as to enable the display device to draw and display a V-I characteristic curve and a P-I characteristic curve; the invention carries out optical power test on the laser by outputting high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio, can directly measure the instantaneous peak optical power of the laser to be measured, and can rapidly and accurately measure the P-I curve without keeping the laser to be measured at constant temperature compared with the traditional optical power measuring system which adopts stepping current to test the laser.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a narrow pulse optical power measurement system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of an optical signal transmission module in a narrow pulse optical power measurement system according to the present invention;
fig. 3 is a flow chart of an embodiment of a method for measuring narrow pulse optical power according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present invention. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The embodiment of the invention provides a narrow pulse optical power measuring system and a method, which are respectively described below.
Fig. 1 is a schematic structural diagram of an embodiment of a narrow pulse optical power measurement system provided by the present invention, where, as shown in fig. 1, the system includes a high-speed pulse optical power sampling device 10 and a display device 20, and the high-speed pulse optical power sampling device 10 includes a pulse constant current source module 110, a voltage detection module 120, an optical signal transmission module 130, a control module 140 and a sampling module 150;
the control module 140 is respectively connected with the display device 20, the pulse constant current source module 110 and the sampling module 150, the pulse constant current source module 110 is connected with the optical signal transmission module 130, and the optical signal transmission module 130 is connected with the sampling module 150;
the control module 140 is configured to send an enable signal to the pulse constant current source module 110 and send a bias voltage control signal to the sampling module 150 according to a test requirement;
the pulse constant current source module 110 is configured to output a high-speed narrow pulse current with adjustable amplitude and adjustable duty cycle to the laser 160 to be tested according to the enable signal, so as to drive the laser 160 to be tested to generate a high-speed pulse optical power signal;
the optical signal transmission module 130 is configured to transmit the high-speed pulse optical power signal to the sampling module 150;
the sampling module 150 is configured to sample the high-speed pulse optical power signal according to the bias voltage control signal, and convert the sampled signal into an optical power digital signal and output the optical power digital signal to the control module 140;
the voltage detection module 120 is configured to detect a voltage of the laser 160 to be detected, obtain voltage data, and send the voltage data to the control module 140;
the control module 140 is further configured to transmit the optical power digital signal, the voltage data and the pulse current to the display device 20;
the display device 20 is used for drawing and displaying a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal.
It should be noted that, in the embodiment of the present invention, the pulse constant current source module 110 is a program-controlled high-speed narrow pulse constant current source module, and can generate a plurality of different high-speed narrow pulse current signals to drive the laser 160 to be tested, and compared with the traditional program-controlled direct current source, the peak optical power of the laser 160 to be tested can be quickly measured, without considering the influence of temperature on the laser; and the display device 20 displays the measured P-I curve in real time, so that the transient acquisition and real-time display of the high-speed pulse optical power signal are realized.
Compared with the prior art, the narrow pulse optical power measurement system provided by the invention comprises a high-speed pulse optical power sampling device 10 and a display device 20, wherein the high-speed pulse optical power sampling device 10 comprises a pulse constant current source module 110, a voltage detection module 120, an optical signal transmission module 130, a control module 140 and a sampling module 150; transmitting an enabling signal to the pulse constant current source module 110 through the control module 140, controlling the pulse constant current source module 110 to output high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to the laser 160 to be tested so as to drive the laser 160 to be tested to generate a high-speed pulse optical power signal, transmitting the high-speed pulse optical power signal to the sampling module 150 through the optical signal transmission module 130, sampling the high-speed pulse optical power signal based on the sampling module 150, converting the sampled signal into an optical power digital signal, then outputting the optical power digital signal to the control module 140, detecting voltage based on the voltage detection module 120 to obtain voltage data, and outputting the pulse current, the voltage data and the optical power digital signal to the display device 20 by the control module 140 so as to enable the display device 20 to draw and display a V-I characteristic curve and a P-I characteristic curve; the invention tests the optical power of the laser by the high-speed narrow pulse current with adjustable amplitude and duty ratio, can directly measure the instantaneous peak optical power of the laser, does not need to carry out peak maintenance, namely, does not need to carry out constant temperature protection on the laser, and can rapidly and accurately measure the P-I curve.
In some embodiments of the present invention, the optical signal transmission module 130 includes an integrating sphere and a fiber optic bundle;
the integrating sphere is used for receiving the high-speed pulse optical power signal and carrying out diffuse reflection attenuation on the high-speed pulse optical power signal;
the optical fiber bundle is used for transmitting the high-speed pulse optical power signal after diffuse reflection attenuation to the sampling module 150.
It can be understood that in the embodiment of the present invention, the integrating sphere can attenuate light with a large intensity into light that can be directly detected by the sampling module 150, the optical fiber bundle can transmit light with different modes, and the combination of the integrating sphere and the optical fiber bundle can ensure that light with a high intensity and different wavelengths can be detected by the sampling module 150, so that a higher bandwidth and a larger gain can be reserved after the optical power signal is transmitted.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of an optical signal transmission module 130 in a narrow pulse optical power measurement system according to the present invention, and in some embodiments of the present invention, an integrating sphere is composed of two hemispheres, including an optical inlet and an optical outlet;
the laser 160 to be tested is provided with a light inlet, the optical fiber bundle is arranged at a light outlet, and the inner wall of the integrating sphere is coated with a diffusion layer.
It can be understood that in the embodiment of the present invention, the integrating sphere is a hollow sphere formed by two hemispheres, the inner wall of the integrating sphere is coated with white non-light barium sulfate as a diffusion layer, the light inlet and the light outlet of the integrating sphere are respectively provided with a window, the light inlet is used for setting the laser 160 to be tested, the light outlet is used for being connected with the optical fiber bundle, and after the light with different angles generated by the laser 160 to be tested is reflected by the inner wall of the integrating sphere for multiple times, the illuminance of the inner wall of the integrating sphere is basically uniform, and at the moment, the optical power of the light outlet is obviously attenuated and becomes smaller.
In some embodiments of the invention, the fiber optic bundle is comprised of a ferrule, a nut, and a single-button tube;
wherein, single knot pipe cladding is outside at the ceramic lock pin, and the ceramic lock pin passes through the connector and is connected with the light outlet of integrating sphere, and the ceramic lock pin passes through the nut and is connected with sampling module 150.
The single-buckle tube is coated on the periphery of the flexible optical fiber section to play a role in protecting the optical fiber from being broken, and meanwhile, the bending radius of the optical fiber can be fixed to prevent dispersion from being deteriorated due to the fact that the bending radius is reduced, so that the accuracy of an optical power signal is affected; the nuts are respectively arranged at two ends of the optical fiber bundle, one end of the optical fiber bundle, which is connected with the integrating sphere, is connected to the light outlet of the integrating sphere through one nut and a connector, and is connected to the sampling module 150 through the other nut, so that the transmission of the light power signal of the light outlet of the integrating sphere to the sampling module 150 is completed.
In some embodiments of the invention, the ferrule is formed from a plurality of fiber monofilaments arranged in a layer-wise fashion in a corresponding order.
It will be appreciated that, as known from the dispersion calculation formula,wherein: />The root mean square spectrum width of the light source is shown, D is the dispersion coefficient, and L is the length segment. The dispersion and the dispersion coefficient are related, and when the bending radius of the optical fiber is small, the dispersion coefficient is large, so the corresponding dispersion is large. The traditional optical fiber for optical communication has very thin core diameter, and very little light is coupled from the output port of the integrating sphere, so that the measurement precision is low; the single-core thick optical fiber has large core diameter, and the dispersion change is large when the bending radius of the optical fiber changes, so that the optical power test repeatability is poor, therefore, in the embodiment of the invention, the ceramic ferrule is formed by adopting a multi-core optical fiber bundle mode, and meanwhile, the optical fiber monofilaments at the two ends of the ceramic ferrule are arranged in a layered manner in a corresponding sequence, so that the reduction degree of optical signals at the two ends can be improved, and the accuracy of transmitting the optical signals by the optical fiber bundle is also improved; at the same time, the arrangement density of the optical fiber monofilaments is improved, so that the optical fiber bundles are connectedThe port may be adapted to receive an optical power signal in a more narrow cavity.
It can be further understood that, referring to fig. 2, the optical power transmission mode of integrating sphere and optical fiber bundle adopts a small size device, flexible disassembly and assembly, and the optical fiber bundle is a wire, and has the characteristics of softness, extension and the like, so that the optical signal transmission becomes more flexible and convenient.
In some embodiments of the present invention, the sampling module 150 includes a photodetector 151, a transimpedance amplifier 152, a high-speed pulse signal processing circuit 153, a high-speed ADC sampling circuit 154, and a bias voltage source 155;
the photoelectric detector 151 is respectively connected with the bias voltage source 155, the optical signal transmission module 130 and the transimpedance amplifier 152, the transimpedance amplifier 152 is connected with the high-speed pulse signal processing circuit 153, the high-speed pulse signal processing circuit 153 is connected with the high-speed ADC sampling circuit 154, the high-speed ADC sampling circuit 154 is connected with the control module 140, and the bias voltage source 155 is connected with the control module 140;
the bias voltage source 155 is configured to generate a low noise bias voltage according to the bias voltage control signal sent by the control module 140 and output the low noise bias voltage to the photodetector 151;
the photodetector 151 is configured to receive the high-speed pulse optical power signal, and convert the high-speed pulse optical power signal into a high-speed pulse current signal and output the high-speed pulse current signal to the transimpedance amplifier 152;
the transimpedance amplifier 152 is configured to convert the high-speed pulse current signal into a high-speed pulse voltage signal and output the high-speed pulse voltage signal to the high-speed pulse signal processing circuit 153;
the high-speed pulse signal processing circuit 153 is configured to process the high-speed pulse voltage signal and output the processed high-speed pulse voltage signal to the high-speed ADC sampling circuit 154;
the high-speed ADC sampling circuit 154 is configured to convert the processed high-speed pulse voltage signal into an optical power digital signal and output the optical power digital signal to the control module 140.
It should be noted that, in this embodiment, the connection between the photodetector 151 and the transimpedance amplifier 152 is usually a coaxial cable, and the coaxial cable itself has a certain distributed capacitance, and in the process of amplifying the high-speed pulse current signal by the transimpedance amplifier 152, the bandwidth and the gain of the transimpedance amplifier 152 are affected by the input capacitance, while in the embodiment of the invention, the photodetector 151 and the transimpedance amplifier 152 are interconnected together by the combination of the integrating sphere and the optical fiber bundle by the shortest distance, so that the input capacitance of the transimpedance amplifier 152 can be effectively reduced, the transmission of the electrical signal by using the coaxial cable is avoided, the bandwidth and the gain of the transimpedance amplifier 152 can be effectively improved, the noise signal is reduced, and the signal-to-noise ratio of the optical power signal is improved.
In some embodiments of the present invention, the voltage detection module 120 is a voltmeter.
On the other hand, the invention also provides a narrow pulse optical power measurement method, which is applied to the narrow pulse optical power measurement system, referring to fig. 3, fig. 3 is a schematic flow chart of an embodiment of the narrow pulse optical power measurement method provided by the invention, and the method comprises the following steps:
s301, generating an enabling signal and a bias voltage control signal through a control module according to a test requirement;
s302, controlling a pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be tested according to the enabling signal so as to drive the laser to be tested to generate a high-speed pulse optical power signal;
s303, transmitting the high-speed pulse optical power signal to a sampling module through an optical signal transmission module;
s304, controlling the sampling module to sample the high-speed pulse optical power signal according to the bias voltage control signal, and converting the sampled signal into an optical power digital signal;
s305, detecting the voltage of the laser to be detected through a voltage detection module to obtain voltage data;
s306, drawing a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal, and displaying the V-I characteristic curve and the P-I characteristic curve through a display device;
compared with the prior art: the invention provides a narrow pulse optical power measuring method, which comprises the steps of sending an enabling signal to a pulse constant current source module through a control module, controlling the pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be measured so as to drive the laser to be measured to generate a high-speed pulse optical power signal, transmitting the high-speed pulse optical power signal to a sampling module through an optical signal transmission module, sampling the high-speed pulse optical power signal based on the sampling module, converting the sampled signal into an optical power digital signal and outputting the optical power digital signal to a display device, and drawing a V-I characteristic curve and a P-I characteristic curve according to the high-speed current pulse, voltage data and the optical power digital signal by the display device and displaying the V-I characteristic curve and the P-I characteristic curve; according to the invention, the laser is subjected to optical power test by outputting the high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio, so that the peak optical power of the laser to be tested can be rapidly measured without considering the influence of temperature on the laser.
In some embodiments of the present invention, step S303 includes:
transmitting the high-speed pulse optical power signal to the sampling module through an integrating sphere and an optical fiber bundle;
the high-speed pulse optical power signal is transmitted as high-speed narrow pulse peak optical power.
It can be understood that the embodiment of the invention realizes the transmission and measurement of the high-speed narrow pulse peak value optical power by replacing the traditional direct current source with the program-controlled high-speed narrow pulse constant current source module and adopting the combination of the integrating sphere and the optical fiber bundle for optical power signal transmission.
It should be noted that: the embodiment or the specific implementation manner of the narrow pulse optical power measurement method of the present invention may refer to the embodiment of the narrow pulse optical power measurement system, and will not be described herein.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The system is characterized by comprising a high-speed pulse optical power sampling device and a display device, wherein the high-speed pulse optical power sampling device comprises a pulse constant current source module, a voltage detection module, an optical signal transmission module, a control module and a sampling module;
the control module is respectively connected with the display device, the pulse constant current source module and the sampling module, the pulse constant current source module is connected with the optical signal transmission module, and the optical signal transmission module is connected with the sampling module;
the control module is used for sending an enabling signal to the pulse constant current source module and sending a bias voltage control signal to the sampling module according to the test requirement;
the pulse constant current source module is used for outputting high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be tested according to the enabling signal so as to drive the laser to be tested to generate a high-speed pulse optical power signal;
the optical signal transmission module is used for transmitting the high-speed pulse optical power signal to the sampling module;
the sampling module is used for sampling the high-speed pulse optical power signal according to the bias voltage control signal, converting the sampled signal into an optical power digital signal and outputting the optical power digital signal to the control module;
the voltage detection module is used for detecting the voltage of the laser to be detected, obtaining voltage data and sending the voltage data to the control module;
the control module is also used for transmitting the optical power digital signal, the voltage data and the pulse current to the display device;
the display device is used for drawing and displaying a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal;
the optical signal transmission module comprises an integrating sphere and an optical fiber bundle consisting of a ceramic ferrule, a nut and a single-buckle tube, wherein the ceramic ferrule is formed by arranging a plurality of optical fiber monofilaments in a layered manner according to a corresponding sequence, and the sampling module comprises a photoelectric detector, a transimpedance amplifier, a high-speed pulse signal processing circuit, a high-speed ADC sampling circuit and a bias voltage source;
the integrating sphere is used for receiving the high-speed pulse optical power signal and carrying out diffuse reflection attenuation on the high-speed pulse optical power signal;
the optical fiber bundle is used for transmitting the high-speed pulse optical power signal subjected to diffuse reflection attenuation to the sampling module.
2. The narrow pulse optical power measurement system of claim 1, wherein the integrating sphere is comprised of two hemispheres, including an optical input port and an optical output port;
the laser to be tested is provided with the light inlet, the optical fiber bundle is arranged at the light outlet, and the inner wall of the integrating sphere is coated with the diffusion layer.
3. The narrow pulse optical power measurement system of claim 2, wherein the diffusing layer is white matte barium sulfate.
4. The narrow pulse optical power measurement system according to claim 3, wherein the single-buckle tube is wrapped outside the ferrule, the ferrule is connected with the light outlet of the integrating sphere through a connector and the nut, and the ferrule is connected with the sampling module through the nut.
5. The narrow pulse optical power measurement system of claim 4, wherein the photodetector is connected to the bias voltage source, the optical signal transmission module, and the transimpedance amplifier, the transimpedance amplifier is connected to the high-speed pulse signal processing circuit, the high-speed pulse signal processing circuit is connected to the high-speed ADC sampling circuit, the high-speed ADC sampling circuit is connected to the control module, and the bias voltage source is connected to the control module;
the bias voltage source is used for generating low-noise bias voltage according to the bias voltage control signal sent by the control module and outputting the low-noise bias voltage to the photoelectric detector;
the photoelectric detector is used for receiving the high-speed pulse optical power signal, is driven by the low-noise bias voltage, converts the high-speed pulse optical power signal into a high-speed pulse current signal and outputs the high-speed pulse current signal to the transimpedance amplifier;
the transimpedance amplifier is used for converting the high-speed pulse current signal into a high-speed pulse voltage signal and outputting the high-speed pulse voltage signal to the high-speed pulse signal processing circuit;
the high-speed pulse signal processing circuit is used for processing the high-speed pulse voltage signal and outputting the processed high-speed pulse voltage signal to the high-speed ADC sampling circuit;
the high-speed ADC sampling circuit is used for converting the processed high-speed pulse voltage signal into an optical power digital signal and outputting the optical power digital signal to the control module.
6. The narrow pulse optical power measurement system of claim 1, wherein the voltage detection module is a voltmeter.
7. A narrow pulse optical power measurement method applied to the narrow pulse optical power measurement system according to any one of claims 1 to 6, characterized in that the method comprises:
generating an enabling signal and a bias voltage control signal through a control module according to the test requirement;
according to the enabling signal, controlling a pulse constant current source module to output high-speed narrow pulse current with adjustable amplitude and adjustable duty ratio to a laser to be tested so as to drive the laser to be tested to generate a high-speed pulse optical power signal;
transmitting the high-speed pulse optical power signal to a sampling module through an optical signal transmission module;
controlling the sampling module to sample the high-speed pulse optical power signal according to the bias voltage control signal, and converting the sampled signal into an optical power digital signal;
detecting the voltage of the laser to be detected through a voltage detection module to obtain voltage data;
and drawing a V-I characteristic curve and a P-I characteristic curve according to the pulse current, the voltage data and the optical power digital signal, and displaying the V-I characteristic curve and the P-I characteristic curve through a display device.
8. The method of claim 7, wherein transmitting the high-speed pulsed optical power signal to the sampling module via the optical signal transmission module comprises:
transmitting the high-speed pulse optical power signal to the sampling module through an integrating sphere and an optical fiber bundle;
the high-speed pulse optical power signal is transmitted as high-speed narrow pulse peak optical power.
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