CN114689275B - A device and method for measuring extinction ratio of an acousto-optic modulator - Google Patents
A device and method for measuring extinction ratio of an acousto-optic modulator Download PDFInfo
- Publication number
- CN114689275B CN114689275B CN202011598743.5A CN202011598743A CN114689275B CN 114689275 B CN114689275 B CN 114689275B CN 202011598743 A CN202011598743 A CN 202011598743A CN 114689275 B CN114689275 B CN 114689275B
- Authority
- CN
- China
- Prior art keywords
- aom
- acousto
- generating device
- extinction ratio
- optical pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
一种声光调制器消光比测量装置及方法，属于量子保密通信技术领域，解决如何准确地测量声光调制器消光比问题；设置测量装置信号源参数，信号源输出两路同步的电信号，分别作为脉冲激光器发光时间参考信号和AOM驱动器驱动时间参考信号，脉冲激光器产生高消光比的光脉冲信号作为参考光信号，光脉冲信号经过AOM调制之后输入到功率计进行功率测量，能够高精度测出声光调制器消光比，装置结构简单，成本低廉，操作简便，测量耗费时间较短，填补了这类技术方案空白；通过测得光脉冲基础光功率P0，再通过调节两路电信号延时，得到最小光功率P2，基础光功率P0与最小光功率P2比值即为声光调制器消光比，该方案简单有效，可实施性好且成本较低。
The invention discloses an acousto-optic modulator extinction ratio measuring device and method, belonging to the technical field of quantum secure communication, and solving the problem of how to accurately measure the extinction ratio of an acousto-optic modulator. The signal source parameters of the measuring device are set, and the signal source outputs two synchronous electrical signals, which are respectively used as a pulse laser light emission time reference signal and an AOM driver driving time reference signal. The pulse laser generates an optical pulse signal with a high extinction ratio as a reference optical signal. The optical pulse signal is modulated by the AOM and input into a power meter for power measurement. The extinction ratio of the acousto-optic modulator can be measured with high precision. The device has a simple structure, low cost, easy operation, and short measurement time, thus filling the blank of such technical solutions. The basic optical power P0 of the optical pulse is measured, and the minimum optical power P2 is obtained by adjusting the delay of the two electrical signals. The ratio of the basic optical power P0 to the minimum optical power P2 is the extinction ratio of the acousto-optic modulator. The solution is simple and effective, has good feasibility and low cost.
Description
Technical Field
The invention belongs to the technical field of quantum secret communication, and relates to an acousto-optic modulator extinction ratio measuring device and method.
Background
Phase Modulators (PM) and acousto-optic modulators (AOM) are two types of modulators commonly used in the optical arts. The principle of a phase modulator is to change the phase of an optical signal passing through the modulator by using the characteristic that an electro-optic crystal changes its refractive index under the action of an electric field. Phase modulators are generally considered to have strong polarization-dependent characteristics, and typically take the form of polarization maintaining fiber coupling during use to control the polarization of light passing through the phase modulator. Unlike phase modulators, the principle of acousto-optic modulators is the acousto-optic effect. When the driving electric signal is loaded on the acousto-optic modulator, an ultrasonic field is formed inside the acousto-optic crystal. When an incident light signal passes through the acousto-optic modulator, the light field and the ultrasonic field interact to generate diffraction, and the light intensity of emergent diffraction light changes along with the change of the intensity of the ultrasonic field. The acousto-optic modulator is usually in a single-mode pigtail coupling mode, and is generally considered to be irrelevant to the polarization characteristics of the modulated optical signal.
In the prior art, chinese patent utility model discloses an acousto-optic modulator optical power loss tester (CN 210719641U), and particularly discloses an acousto-optic modulator optical power loss tester which sequentially comprises a light source laser (1), a first optical fiber collimator (2), a first clamp (3), an acousto-optic device (4), a second clamp (5), a second optical fiber collimator (6) and a laser power meter (7) from left to right on the same horizontal line.
However, the technical solution of the patent does not mention how to measure the extinction ratio of the acousto-optic modulator, and a complete disclosure solution in the prior art is not yet obtained through document retrieval, so how to measure the extinction ratio of the acousto-optic modulator belongs to the technical blank.
Disclosure of Invention
The technical problem to be solved by the invention is how to accurately measure the extinction ratio of an acousto-optic modulator.
The invention solves the technical problems through the following technical scheme:
An acousto-optic modulator extinction ratio measuring device comprises a control signal generating device, an optical pulse signal generating device, an AOM driver, an AOM and a power meter, wherein two output ends of the control signal generating device are respectively connected with input ends of the optical pulse signal generating device and the AOM driver, the output end of the optical pulse signal generating device is connected to the AOM, the output end of the AOM driver is also connected to the AOM, the output end of the AOM is connected to the power meter, a measuring light path of the extinction ratio of the acousto-optic modulator is that parameters of the control signal generating device are set, the control signal generating device outputs two synchronous electric signals which are respectively used as a light emitting time reference signal of the optical pulse signal generating device and a driving time reference signal of the AOM driver, the optical pulse signal generating device generates an optical pulse signal serving as a reference optical signal, and the optical pulse signal is input to the power meter for power measurement after being modulated by the AOM.
The invention relates to an acousto-optic modulator extinction ratio measuring device, wherein a measuring light path of an acousto-optic modulator extinction ratio is characterized in that parameters of a signal source are set, the signal source outputs two paths of synchronous electric signals which are respectively used as a light emitting time reference signal of a pulse laser and a driving time reference signal of an AOM driver, the pulse laser generates an optical pulse signal with high extinction ratio as a reference optical signal, the optical pulse signal is input into a power meter for power measurement after being subjected to AOM modulation, the extinction ratio of the acousto-optic modulator can be measured with high precision, the device has simple structure and low cost, is easy and convenient to operate, and the measuring time is short, thereby filling the blank of the technical scheme.
As a further improvement of the technical scheme of the invention, the control signal generating device outputs a first electric signal of two paths of synchronous electric signals to be sent to the optical pulse signal generating device, the optical pulse signal generating device is controlled to output an optical pulse signal, the AOM is controlled to be not operated, the basic optical power P0 of the optical pulse signal is measured by using the power meter, a second electric signal is sent to the AOM driver, the AOM is controlled to operate, the relative time delay of the first electric signal and the second electric signal is gradually changed, the minimum optical power P2 measured by the power meter is found, and the extinction ratio of the AOM is calculated to be P0/P2.
As a further improvement of the technical scheme of the invention, the luminous frequency of the optical pulse signal generating device is not higher than the modulation frequency of the AOM.
As a further improvement of the technical scheme of the invention, the light emitting period of the optical pulse signal generating device is an integer multiple of the modulation period of the AOM.
As a further improvement of the technical scheme of the invention, the optical pulse signal generating device is a pulse laser.
As a further improvement of the technical scheme of the invention, the optical pulse signal generating device uses a continuous photointerruption method to generate the required optical pulse signal.
As a further improvement of the technical scheme of the invention, the device for generating the required optical pulse signals by using the continuous photointerruption method is a modulator with an intensity modulation function.
As a further improvement of the technical scheme of the invention, the modulator with the intensity modulation function is an intensity modulator or an electroabsorption modulator.
As a further improvement of the technical scheme of the invention, the control signal generating device and the power meter are controlled by an upper computer.
As a further improvement of the technical scheme of the invention, the control signal generating device adopts any one of a signal source, a signal generator, an arbitrary function generator or a control circuit board.
As a further improvement of the technical scheme of the invention, the parameters of the control signal generating device comprise waveform, frequency, amplitude, bandwidth, time delay and duty ratio of the output signal.
The measuring method adopting the acousto-optic modulator extinction ratio measuring device comprises the following steps:
step S1, setting parameters of a control signal generating device through a control panel of the control signal generating device or an upper computer, outputting an electric signal 1 to an optical pulse signal generating device, and controlling the optical pulse signal generating device to output an optical pulse signal;
step S2, setting the AOM to be inoperative, and measuring the power P0 of the optical pulse signal by using a power meter;
Step S3, setting parameters of a control signal generating device through a control panel of the control signal generating device, and outputting an electric signal 2 to an AOM driver by the control signal generating device;
s4, controlling the AOM to work, and measuring the power P1 of the optical pulse signal by using a power meter;
step S5, gradually changing the relative delay of the electric signal 1 and the electric signal 2, and finding out the minimum power P2 of the power P1 of the optical pulse signal;
and S6, calculating the extinction ratio of the AOM to be P0/P2, namely the extinction ratio of the acousto-optic modulator.
As a further improvement of the technical scheme, the step S6 further comprises the step S7 of returning to the step S4 after changing the output voltage of the AOM driver until the set number of times of the output voltage of the different AOM driver is reached, and ending the measurement.
According to the measuring method of the extinction ratio of the acousto-optic modulator, the minimum optical power P2 is obtained by measuring the basic optical power P0 of the optical pulse and adjusting the time delay of two paths of electric signals, and the ratio of the basic optical power P0 to the minimum optical power P2 is the extinction ratio of the acousto-optic modulator.
The invention has the advantages that:
(1) The invention relates to an acousto-optic modulator extinction ratio measuring device, wherein a measuring light path of an acousto-optic modulator extinction ratio is characterized in that parameters of a signal source are set, the signal source outputs two paths of synchronous electric signals which are respectively used as a light emitting time reference signal of a pulse laser and a driving time reference signal of an AOM driver, the pulse laser generates an optical pulse signal with high extinction ratio as a reference optical signal, the optical pulse signal is input into a power meter for power measurement after being subjected to AOM modulation, the extinction ratio of the acousto-optic modulator can be measured with high precision, the device has simple structure and low cost, is easy and convenient to operate, and the measuring time is short, thereby filling the blank of the technical scheme.
(2) According to the measuring method of the extinction ratio of the acousto-optic modulator, the minimum optical power P2 is obtained by measuring the basic optical power P0 of the optical pulse and adjusting the time delay of two paths of electric signals, and the ratio of the basic optical power P0 to the minimum optical power P2 is the extinction ratio of the acousto-optic modulator.
Drawings
FIG. 1 is a block diagram of an acousto-optic modulator extinction ratio measurement apparatus according to a first embodiment of the invention;
FIG. 2 is a flow chart of an acousto-optic modulator extinction ratio measurement method according to a second embodiment of the invention;
fig. 3 is a block diagram of a prior art acousto-optic modulator optical power loss tester.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. 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.
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments:
Example 1
As shown in figure 1, the device for measuring the extinction ratio of the acousto-optic modulator comprises a signal source, a pulse laser, an AOM driver, an AOM and a power meter, wherein two output ends of the signal source are respectively connected with input ends of the pulse laser and the AOM driver, the output end of the pulse laser is connected to the AOM, the output end of the AOM driver is also connected to the AOM, and the output end of the AOM is connected to the power meter.
The extinction ratio measuring light path of the acousto-optic modulator is as follows, a pulse laser is used for outputting light pulses with high extinction ratio as a reference light signal. The optical pulse is input into a high-precision power meter for power measurement after being subjected to AOM modulation. Two synchronous electric signals are output by using one signal source and are respectively used as a light emitting time reference signal of a pulse laser and a driving time reference signal of an AOM driver.
Firstly, setting parameters of a signal source, such as waveform, frequency, amplitude, bandwidth, time delay, duty ratio and the like of an output signal through a signal source control panel or an upper computer, outputting an electric signal 1 to a pulse laser by the signal source, controlling the pulse laser to output an optical pulse signal, setting an AOM to be inoperative, measuring the power P0 of the optical pulse signal by using a power meter, secondly, setting parameters of the signal source, such as waveform, frequency, amplitude, bandwidth, time delay, duty ratio and the like of the output signal through the signal source control panel or the upper computer, outputting an electric signal 2 to an AOM driver by the signal source, controlling the AOM to work, measuring the power P1 of the optical pulse signal by using the power meter, then gradually changing the relative time delay of the electric signal 1 and the electric signal 2, finding out the minimum power P2 of the power P1 of the optical pulse signal, and finally, calculating the extinction ratio P0/P2 of the AOM, wherein the power can be directly subtracted when dBm is taken as a unit.
Note that here the emission frequency of the pulsed laser cannot in principle be higher than the modulation frequency of the AOM, otherwise the measurement result is inaccurate. And the emission period of the pulsed laser should be an integer multiple of the modulation period of the AOM.
By using the method, the output voltage of the AOM driver is changed, and the extinction ratio of the AOM under different driving voltages can be conveniently measured.
If the signal source and the power meter are controlled by the upper computer, the control of relative delay and the power reading are realized, then the scheme can be utilized to realize automatic measurement and result recording, the cost can be further reduced, and the testing efficiency and the testing precision are improved.
Note that the optical pulse signal here may also be generated by other means, such as generating the required optical pulse by using a method of continuous photointerruption, such as by a modulator having an intensity modulation function, including an intensity modulator, an electroabsorption modulator, or the like.
Note that the signal source may also be implemented in other ways, such as a signal generator, an arbitrary function generator, a control circuit board, etc.
Example two
As shown in fig. 2, the specific steps of the method for measuring the extinction ratio by using the acousto-optic modulator according to the first embodiment are as follows:
Step S1, setting parameters of a signal source, such as waveform, frequency, amplitude, bandwidth, time delay, duty ratio and the like of an output signal through a signal source control panel or an upper computer, outputting an electric signal 1 to a pulse laser, and controlling the pulse laser to output an optical pulse signal;
step S2, setting the AOM to be inoperative, and measuring the power P0 of the optical pulse signal by using a power meter;
Step S3, setting parameters of a signal source, such as waveform, frequency, amplitude, bandwidth, time delay, duty ratio and the like of an output signal through a signal source control panel or an upper computer, and outputting an electric signal 2 to an AOM driver by the signal source;
s4, controlling the AOM to work, and measuring the power P1 of the optical pulse signal by using a power meter;
step S5, gradually changing the relative delay of the electric signal 1 and the electric signal 2, and finding out the minimum power P2 of the power P1 of the optical pulse signal;
s6, calculating the extinction ratio of the AOM to be P0/P2, wherein the extinction ratio of the acousto-optic modulator can be directly subtracted when the power is in dBm;
The method can also comprise the following steps:
And S7, after changing the output voltage of the AOM driver, returning to the step S4 until the set times of the output voltage of different AOM drivers are reached, and ending the measurement, so that the extinction ratio of the AOM under different driving voltages is conveniently measured by changing the output voltage of the AOM driver.
The foregoing embodiments are merely for illustrating the technical solution of the present invention, but not for limiting the same, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solution of the embodiments of the present invention in essence.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011598743.5A CN114689275B (en) | 2020-12-29 | 2020-12-29 | A device and method for measuring extinction ratio of an acousto-optic modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011598743.5A CN114689275B (en) | 2020-12-29 | 2020-12-29 | A device and method for measuring extinction ratio of an acousto-optic modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114689275A CN114689275A (en) | 2022-07-01 |
| CN114689275B true CN114689275B (en) | 2025-05-16 |
Family
ID=82131434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011598743.5A Active CN114689275B (en) | 2020-12-29 | 2020-12-29 | A device and method for measuring extinction ratio of an acousto-optic modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114689275B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414512A (en) * | 2013-08-27 | 2013-11-27 | 华南师范大学 | Extinction ratio measuring method and system |
| CN109270711A (en) * | 2018-12-07 | 2019-01-25 | 南京牧镭激光科技有限公司 | Driving device and execution system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07325011A (en) * | 1994-05-31 | 1995-12-12 | Ando Electric Co Ltd | Extinction ratio measuring apparatus |
| JP2013114065A (en) * | 2011-11-29 | 2013-06-10 | Sumitomo Osaka Cement Co Ltd | Short pulse light generating device and bias voltage evaluation method for optical modulator |
| CN209495833U (en) * | 2019-07-29 | 2019-10-15 | 北京中创为南京量子通信技术有限公司 | A kind of light intensity modulator detection device |
-
2020
- 2020-12-29 CN CN202011598743.5A patent/CN114689275B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414512A (en) * | 2013-08-27 | 2013-11-27 | 华南师范大学 | Extinction ratio measuring method and system |
| CN109270711A (en) * | 2018-12-07 | 2019-01-25 | 南京牧镭激光科技有限公司 | Driving device and execution system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114689275A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101839698B (en) | BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof | |
| US6469514B2 (en) | Timing calibration apparatus and method in a semiconductor integrated circuit tester | |
| US11143558B2 (en) | Method and system for measuring transient time width of ultrashort pulse | |
| US6178001B1 (en) | Method and apparatus for optical frequency modulation characterization of laser sources | |
| CN108956544B (en) | Automatic detection system and method for transverse relaxation time of atoms | |
| CN105572915B (en) | A kind of electrooptic modulator light pulse reshaping apparatus and shaping methods for introducing reference light | |
| CN111912516A (en) | Phase-synchronized optical fiber distributed vibration measurement device, driver and method | |
| CN110411715B (en) | Device and method for determining half-wave voltage of AMZI phase modulator | |
| CN114689275B (en) | A device and method for measuring extinction ratio of an acousto-optic modulator | |
| CN216721333U (en) | System for measuring half-wave voltage of lithium niobate phase modulator | |
| CN204758000U (en) | A pulse light signal generating device for distributed optical fiber sensing system | |
| EP4489329A1 (en) | Apparatus and method for measuring chirp in fiber optical transmitters | |
| CN205484522U (en) | Phase modulator half -wave voltage measurement system | |
| CN108594627A (en) | A method for obtaining delay time of functional optical device | |
| CN212254333U (en) | Phase synchronization optical fiber distributed vibration measuring device and driver | |
| CN105865656B (en) | A kind of high s/n ratio inhibits the single-ended RBOTDA sensor-based systems of non-local effect | |
| CN205680924U (en) | A single-frequency pulsed all-fiber laser based on self-phase modulation precompensation | |
| CN111988135B (en) | Time domain calibration device and method for optical pulse and electric pulse | |
| KR20120081545A (en) | Optical signal output apparatus, electrical signal output apparatus, and test apparatus | |
| US7953320B2 (en) | Systems and methods for determining an AC/DC cross-calibration coefficient | |
| CN210571295U (en) | Device for measuring SOA line width enhancement factor of semiconductor optical amplifier | |
| CN205231456U (en) | Pulsed light source | |
| CN113224640B (en) | Drive circuit of laser and drive method thereof | |
| JP4732156B2 (en) | Polarization direction conversion apparatus and polarization direction conversion method | |
| KR100499115B1 (en) | An apparatus for measuring a transient chirp of a optical modulator and a method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |