CN110617947A - Light source detection and correction system and method - Google Patents
Light source detection and correction system and method Download PDFInfo
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- CN110617947A CN110617947A CN201810979145.9A CN201810979145A CN110617947A CN 110617947 A CN110617947 A CN 110617947A CN 201810979145 A CN201810979145 A CN 201810979145A CN 110617947 A CN110617947 A CN 110617947A
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- 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
Abstract
The invention provides a light source detection and correction system and a method, comprising a coupler, a filter, a detector and a control module; the coupler transmits part of light emitted by the light source to the filter, the filter filters the part of light and transmits the part of light to the detector, the detector detects the light intensity of the part of light and transmits the detected light intensity value to the control module, and the control module judges whether the light source drifts according to the detected light intensity value and corrects the light source after judging that the light source drifts. The light source detection and correction system and the light source detection and correction method provided by the invention can find the drift condition of the light source in time, correct the drift condition in time and greatly reduce the cycle and complexity of light source drift correction.
Description
Technical Field
The present invention relates to the field of optical communication and quantum communication technologies, and in particular, to a light source detection and correction system and method.
Background
The laser injection locking technology is mostly applied to the technical field of optical communication and quantum communication, and is mainly used for improving the modulation bandwidth of a semiconductor laser and the bistable state, four-wave mixing and other nonlinear effects of the laser during strong injection locking.
In the technical field of Quantum communication, because a plurality of lasers in a QKD (Quantum Key Distribution) system have the problem of wavelength inconsistency and a single laser has the problem of poor light pulse quality, the QKD system has the problems of security holes and poor performance, and the injection locking technology can be adopted to well overcome the problem.
However, in practical applications, the laser often drifts due to the influence of factors such as temperature, etc., which affects the effect and quality of injection locking, and in the prior art, instruments such as a spectrometer are mostly adopted to perform debugging and correction on the laser again.
Disclosure of Invention
The present invention provides a light source detection and correction system and method, which can detect drift of a light source such as a laser in time and correct the drift in time.
In order to achieve the purpose, the invention provides the following technical scheme:
a light source detection and correction system comprises a coupler, a filter, a detector and a control module;
the coupler is used for transmitting part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter is used for filtering the part of the light rays and transmitting the part of the light rays to the detector; the bandwidth of the filter is matched with the spectral line width of the light source;
the detector is used for detecting the light intensity of the partial light and transmitting the detected light intensity value to the control module;
the control module is used for judging whether the light source drifts according to the detected light intensity value and correcting the light source after judging that the light source drifts.
Optionally, the control module determines whether the light source drifts according to the detected light intensity value, including determining whether the light intensity value is within a preset threshold range, if so, the light source does not drift, and if not, the light source drifts;
the control module corrects the light source by carrying out temperature fine adjustment on the light source, or carrying out time delay fine adjustment and temperature fine adjustment on the light source.
Optionally, the light source is an injection-locked light source comprising a master laser, a slave laser and a circulator;
the first end of the circulator is connected with the master laser, the second end of the circulator is connected with the slave laser, and the third end of the circulator is connected with the coupler;
the circulator is used for transmitting the laser emitted by the master laser to the slave laser so as to perform injection locking on the emitted laser of the slave laser;
the circulator is also used for transmitting the laser light emitted from the laser to the coupler, so that the coupler transmits part of the light in the laser light emitted from the laser to the filter.
Optionally, the detector is a single photon detector; the control module is an FPGA chip, an MCU or a micro CPU.
Optionally, a power detection circuit is further included;
the light intensity value detected by the detector is transmitted to the control module after being detected by the power detection circuit.
A light source detection and correction method is applied to the light source detection and correction system, and comprises the following steps:
the coupler transmits part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter filters the part of the light rays and transmits the part of the light rays to the detector;
the detector detects the light intensity of the partial light and transmits the detected light intensity value to the control module;
and the control module judges whether the light source drifts according to the detected light intensity value, and if so, the light source is corrected.
Optionally, the determining whether the light source drifts according to the detected light intensity value includes:
judging whether the light intensity value is within a preset threshold range;
if so, judging that the light source does not drift;
if not, determining that the light source drifts.
Optionally, the correcting the light source comprises:
carrying out temperature fine adjustment on the light source;
or carrying out time delay fine adjustment and temperature fine adjustment on the light source.
Optionally, performing temperature fine-tuning on the light source includes:
adjusting the temperature of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, continuously adjusting the temperature of the light source until the light source is judged not to have drifted according to the light intensity value detected by the detector;
if not, the correction flow is ended.
Optionally, performing time delay fine tuning and temperature fine tuning on the light source, including:
adjusting the delay value of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, adjusting the temperature value of the light source, if the light source is still judged to have drift according to the light intensity value detected by the detector, adjusting the delay value of the light source, and circulating the steps until the light source is judged not to have drift according to the light intensity value detected by the detector;
if not, the correction flow is ended.
Compared with the prior art, the technical scheme provided by the invention has
The following advantages are provided:
the invention provides a light source detection and correction system and a light source detection and correction method.A coupler transmits part of light emitted by a light source to a filter, and the filter filters the part of light and transmits the part of light to a detector; the detector detects the light intensity of partial light, and transmits the detected light intensity value to the control module, and the control module judges whether the light source drifts according to the detected light intensity value, and corrects the light source after judging that the light source drifts. The light source detection and correction system and the light source detection and correction method provided by the invention can find the drift condition of the light source in time, correct the drift condition in time and greatly reduce the cycle and complexity of light source drift correction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a light source detection and correction system according to the present invention;
FIG. 2 is a schematic structural diagram of another light source detection and correction system according to the present invention;
fig. 3 is a flowchart of a light source detection and correction method provided by the present invention.
Detailed Description
As described in the background art, in practical applications, a laser often drifts due to the influence of a series of factors, which affects the effect and quality of injection locking, and in the prior art, instruments such as a spectrometer and the like are mostly used to debug and correct the laser again.
Based on this, the invention provides a light source detection and correction system to overcome the above problems in the prior art, comprising a coupler, a filter, a detector and a control module;
the coupler is used for transmitting part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter is used for filtering the part of the light rays and transmitting the part of the light rays to the detector; the bandwidth of the filter is matched with the spectral line width of the light source;
the detector is used for detecting the light intensity of the partial light and transmitting the detected light intensity value to the control module;
the control module is used for judging whether the light source drifts according to the detected light intensity value and correcting the light source after judging that the light source drifts.
The invention also provides a light source detection and correction method, which is applied to the light source detection and correction system and comprises the following steps:
the coupler transmits part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter filters the part of the light rays and transmits the part of the light rays to the detector;
the detector detects the light intensity of the partial light and transmits the detected light intensity value to the control module;
the control module judges whether the light source drifts according to the detected light intensity value and corrects the light source when the light source drifts.
The invention provides a light source detection and correction system and a light source detection and correction method.A coupler transmits part of light emitted by a light source to a filter, the filter filters the part of light and transmits the part of light to a detector, the detector detects the light intensity of the part of light and transmits the detected light intensity value to a control module, and the control module judges whether the light source drifts according to the detected light intensity value and corrects the light source after judging that the light source drifts. The light source detection and correction system and the light source detection and correction method provided by the invention can find the drift condition of the light source in time, correct the drift condition in time and greatly reduce the cycle and complexity of light source drift correction.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a light source detection and correction system, which is a closed-loop control system capable of performing online detection and feedback adjustment on a light source, as shown in fig. 1, and the light source detection and correction system provided by the embodiment of the present invention includes a coupler 20, a filter 21, a detector 22, and a control module 23.
It should be noted that the light source detection and correction system provided in the embodiment of the present invention is applied to an injection locking light source and a non-injection locking light source, where the non-injection locking light source may be a laser or a light emitting diode, and the present invention is not limited thereto.
The coupler 20 is used for transmitting part of light emitted by the light source 1 to the filter 21 so as to realize online detection of the light source 1; the filter 21 is used for filtering the part of the light rays and transmitting the part of the light rays to the detector 22; the detector 22 is used for detecting the light intensity of the partial light and transmitting the detected light intensity value to the control module 23; the control module 23 is configured to determine whether the light source 1 drifts according to the detected light intensity value, and correct the light source 1 after determining that the light source 1 drifts.
In this embodiment, the bandwidth of the filter 21 is matched with the spectral line width of the light source 1, because when the light source 1 drifts, the spectral line width of the light source 1 exceeds the pass band range of the filter 21, and the light intensity value detected by the detector 22 changes. Therefore, it can be determined whether the light source 1 has a drift phenomenon according to the change of the light intensity value detected by the detector 22.
Specifically, the step of determining whether the light source 1 drifts according to the detected light intensity value by the control module 23 includes: and judging whether the light intensity value is within a preset threshold range, if so, not drifting of the light source 1 occurs, and if not, drifting of the light source 1 occurs.
Optionally, the detector 22 in this embodiment of the present invention is a single photon detector that records light intensity values in a count manner. In the normal working stage of the light source 1, the single photon detector transmits a detected count value corresponding to the light intensity value of part of the light source 1 to the control module 23, the control module 23 judges whether the count value is within a preset threshold range, if the count value is within the preset threshold range, the light source 1 is in a normal state, no drift occurs, the single photon detector continues to detect the light intensity value of the light source 1, the control module 23 continues to judge, if the count value is not within the preset threshold range, the light source 1 is indicated to have the drift, and the control module 23 controls the light source 1 to stop working and corrects the light source 1.
Specifically, the control module 23 corrects the light source 1, including performing temperature fine adjustment on the light source 1, or performing delay fine adjustment and temperature fine adjustment on the light source 1. Of course, the invention is not limited thereto, and in other embodiments, the control module 23 may also perform the calibration on the light source 1 in other manners.
Optionally, the control module 23 performs temperature fine-tuning on the light source 1, including:
the control module 23 adjusts the temperature of the light source 1, such as increasing or decreasing the temperature value of the light source 1, and determines whether the light source 1 has drift according to the light intensity value detected by the detector 22; if the light source 1 has drift, the temperature of the light source 1 is continuously adjusted until the light source 1 is judged to have no drift according to the light intensity value detected by the detector 22, the correction process is ended, and the control module 23 controls the light source 1 to enter a normal working state; if there is no drift, the calibration process is ended, and the control module 23 controls the light source 1 to enter a normal working state.
Further, before the temperature of the light source 1 is continuously adjusted, the light intensity value currently detected by the detector 22 may be compared with the light intensity value detected last time, if the light intensity value currently detected is larger, the temperature value is further increased or decreased based on the current temperature, and if the light intensity value currently detected is smaller, the temperature value is further decreased or increased based on the current temperature, that is, the reverse debugging temperature value. Alternatively, the temperature value is 0.1 ℃ per increment or decrement.
Optionally, the control module 23 performs delay fine tuning and temperature fine tuning on the light source 1, including:
the control module 23 adjusts the delay value of the light source 1 and determines whether there is any drift in the light source 1 according to the light intensity value detected by the detector 22. If no drift exists, the correction process is ended. If drift exists, the temperature of the light source 1 is adjusted, if the drift of the light source 1 is still determined according to the light intensity value detected by the detector 22, the delay value of the light source 1 is adjusted, the process is circulated until the drift of the light source 1 is determined not to occur according to the light intensity value detected by the detector 22, the correction process is ended, and the control module 23 controls the light source 1 to enter a normal working state.
Specifically, the control module 23 adjusts the delay value of the light source 1, for example, increases or decreases the delay value of the light source 1, so that the delay values take values in a preset delay value range in sequence, if one of the delay values makes it possible to determine that the light source 1 does not drift according to the light intensity value detected by the detector 22, the calibration process is ended, if after taking values in the preset delay value range in sequence, it is still determined that the light source 1 drifts according to the light intensity value detected by the detector 22, the delay value corresponding to the light intensity threshold value closest to the light intensity value without drifting is selected as the delay value of the light source 1, and adjusts the temperature of the light source 1, for example, increases or decreases the temperature value of the light source 1, so that the temperature takes values in a preset temperature value range in sequence, if one of the temperature values makes it is determined that the light source 1 does not drift according to the light intensity value detected by the detector 22, the calibration, if the light source 1 is still determined to have drift according to the light intensity value detected by the detector 22, selecting the temperature value corresponding to the light intensity threshold value closest to the light intensity value without drift as the temperature of the light source 1, and adjusting the delay value of the light source 1 again, and repeating the steps until the light source 1 is determined not to have drift according to the light intensity value detected by the detector 22, ending the correction process, and controlling the light source 1 to enter a normal working state by the control module 23.
Further, in the process of sequentially taking values within the preset delay value range, before taking values again, the light intensity value currently detected by the detector 22 may be compared with the light intensity value detected last time, if the light intensity value currently detected is larger, the delay value is further increased or decreased based on the current delay value, and if the light intensity value currently detected is smaller, the delay value is further decreased or increased based on the current delay value, that is, the delay value is debugged reversely. Alternatively, the delay value is 11ps per increment or decrement.
Similarly, in the process of sequentially taking values within the preset temperature value range, before taking values again, the current detected light intensity value of the detector 22 may be compared with the last detected light intensity value, if the current detected light intensity value is larger, the temperature value is further increased or decreased based on the current temperature, and if the current detected light intensity value is smaller, the temperature value is further decreased or increased based on the current temperature, that is, the reverse debugging temperature value. Alternatively, the temperature value is 0.1 ℃ per increment or decrement.
Optionally, the light source detection and correction system provided in the embodiment of the present invention further includes a power detection circuit;
the light intensity value detected by the detector 22 is detected by the power detection circuit and then transmitted to the control module 23.
In one embodiment of the present invention, as shown in fig. 2, the light source 1 is an injection-locked light source that includes a master laser 10, a slave laser 11, and a circulator 12.
A first end 1 of a circulator 12 is connected with a master laser 10, a second end 2 of the circulator 12 is connected with a slave laser 11, and a third end 3 of the circulator 12 is connected with a coupler 20; the circulator 12 is used for transmitting the laser light emitted by the master laser 10 into the slave laser 11 so as to perform injection locking on the laser light emitted by the slave laser 11; the circulator 12 is also used for transmitting the laser light emitted from the laser 11 to the coupler 20, so that the coupler 20 transmits part of the light of the laser light emitted from the laser 11 to the filter 21.
In this embodiment, when the light source 1 is an injection locking light source, the filter 21 is a narrow-band filter, and includes fiber grating type filters such as temperature compensation gratings and phase shift gratings or other narrow-band filter function devices, and is not limited to fiber optics devices, but may also be filter devices such as space optics.
Further, coupler 20 is preferably a single mode coupler, although the invention is not limited in this regard. The control module 23 may be an FPGA (Field-Programmable Gate Array) chip or an MCU (micro controller Unit).
The light source detection and correction system provided by the embodiment of the invention is a process of actively detecting parameters of an injection locking light source in a QKD system, judging the online state performance of the light source according to the dynamic detection result of the parameters and carrying out self-stabilization processing on the light source. The specific process of detecting and correcting the injection locking light source comprises the following steps:
the control module 23 controls the main laser 10 and the slave laser 11 to enter a working state, the circulator 12 transmits laser emitted from the main laser 10 to the slave laser 11, injection locking is performed on the laser emitted from the slave laser 11, then, the circulator 12 transmits the laser emitted from the laser 11 to the coupler 20, the coupler 20 transmits part of light rays in the laser emitted from the laser 11 to the filter 21, and transmits the other part of light rays to the QKD optical path main transmission link, so that online detection can be performed on an injection locking light source without affecting the normal working state of the QKD system;
part of light emitted from the laser 11 passes through the filter 21 and is detected by the detector 22, data detected by the detector 22, namely, a light intensity value, is detected by the power detection circuit and then is uploaded to the control module 23, and the control module 23 judges whether the injection locking light source drifts or loses lock. If drift or lock loss occurs, the control module 23 reports an exception to the QKD system, terminates the flow operation related to the QKD system, and enters an exception stage, and in the exception stage, the control module 23 adjusts a delay value of the master laser 10 or the slave laser 11, and adjusts a temperature value of the master laser 10 to correct the injection-locked light source. If no drift or loss of lock occurs, coupler 20, filter 21, detector 22 and control module 23 continue to detect the injection-locked light source.
The control module 23 may adjust the delay value of the master laser 10 or the slave laser 11, if the value is sequentially taken within the preset delay value range and the light intensity value is still not within the preset threshold value range, the control module 23 may select the delay value closest to the threshold value as the delay value of the master laser 10 or the slave laser 11, then the control module 23 may adjust the temperature value of the master laser 10, and similarly, if the value is sequentially taken within the preset temperature value range and the light intensity value is still not within the preset threshold value range, the control module 23 may select the temperature value closest to the threshold value as the temperature value of the master laser 10, and then the control module 23 may adjust the delay value of the master laser 10 or the slave laser 11 again, and so on, until the detected light intensity value is still within the preset threshold value range.
In the embodiment of the present invention, the optical injection locking technology is adopted to greatly improve the optical pulse performance of the slave laser 11, so as to realize narrow-line-width output of the slave laser 11, and after part of the light output from the slave laser 11 enters the monitoring link through the coupler 20, the detection of the light intensity value is realized by using the narrow-band filter 21 and the detector 22.
The light source detection and correction system provided by the invention can find the drift condition of the light source in time, correct the drift condition in time and greatly reduce the cycle and complexity of the drift correction of the light source.
An embodiment of the present invention further provides a light source detection and correction method, which is applied to the light source detection and correction system provided in the above embodiment, as shown in fig. 3, and includes:
s301: the coupler transmits part of light emitted by the light source to the filter so as to realize the on-line detection of the light source;
s302: the filter filters the part of the light rays and transmits the part of the light rays to the detector;
s303: the detector detects the light intensity of the partial light and transmits the detected light intensity value to the control module;
s304: the control module judges whether the light source drifts according to the detected light intensity value, if so, the S305 is carried out, and if not, the S301 is carried out;
s305: and correcting the light source.
Wherein, judging whether the light source has drift according to the detected light intensity value comprises:
judging whether the light intensity value is within a preset threshold range;
if so, judging that the light source does not drift;
if not, determining that the light source drifts.
Optionally, the detector is a single photon detector that records light intensity values in a counting manner. In the normal working stage of the light source, the single photon detector transmits a detected counting value corresponding to the light intensity value of part of light of the light source to the control module, the control module judges whether the counting value is within a preset threshold range, if the counting value is within the preset threshold range, the light source state is normal, no drift occurs, the single photon detector continues to detect the light intensity value of the light source, the control module continues to judge, if the counting value is not within the preset threshold range, the light source is drifted, the control module controls the light source to stop working, and the light source is corrected.
Optionally, the correcting the light source comprises: carrying out temperature fine adjustment on the light source; or carrying out time delay fine adjustment and temperature fine adjustment on the light source.
Further, the temperature trimming of the light source includes:
adjusting the temperature of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, continuously adjusting the temperature of the light source until the light source is judged not to have drifted according to the light intensity value detected by the detector;
if not, the correction flow is ended.
Specifically, the control module adjusts the temperature of the light source, such as increasing or decreasing the temperature value of the light source, and judges whether the light source has drift according to the light intensity value detected by the detector; if the light source has drift, the temperature of the light source is continuously adjusted until the light source is judged to have no drift according to the light intensity value detected by the detector, the correction process is ended, and the control module controls the light source to enter a normal working state; if no drift exists, the correction process is ended, and the control module controls the light source to enter a normal working state.
Further, before the temperature of the light source is continuously adjusted, the light intensity value currently detected by the detector can be compared with the light intensity value detected last time, if the light intensity value currently detected is large, the temperature value is further increased or decreased on the basis of the current temperature, and if the light intensity value currently detected is small, the temperature value is further decreased or increased on the basis of the current temperature, namely the reverse debugging temperature value. Alternatively, the temperature value is 0.1 ℃ per increment or decrement.
Further, the fine tuning of the delay and the fine tuning of the temperature of the light source include:
adjusting the delay value of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, adjusting the temperature of the light source, if the light source is still judged to have drift according to the light intensity value detected by the detector, adjusting the delay value of the light source, and circulating the steps until the light source is judged not to have drift according to the light intensity value detected by the detector;
if not, the correction flow is ended.
Specifically, the delay values of the light source are adjusted, for example, the delay values of the light source are increased or decreased, so that the delay values take values in sequence in a preset delay value range, if one of the delay values makes it possible to determine that the light source does not drift according to the light intensity value detected by the detector, the correction process is ended, if the values take values in sequence in the preset delay value range, and it is still determined that the light source has drift according to the light intensity value detected by the detector, the delay value corresponding to the light intensity threshold value closest to the light intensity value without drift is selected as the delay value of the light source, and the temperature of the light source is adjusted, for example, the temperature value of the light source is increased or decreased, so that the temperature takes values in sequence in the preset temperature value range, if one of the temperature values makes it is determined that the light source does not drift according to the light intensity value detected by the, and if the light source is still judged to have drift according to the light intensity value detected by the detector, selecting the temperature value corresponding to the light intensity value threshold value which is closest to the light intensity value without drift as the temperature of the light source, adjusting the delay value of the light source again, circulating the steps until the light intensity value detected by the detector is judged that the light source does not have drift, ending the correction process, and controlling the light source to enter a normal working state.
That is to say, when the light source is subjected to delay fine adjustment and temperature fine adjustment, the light source may be subjected to delay fine adjustment first, if the delay adjustment is unsuccessful, that is, the adjusted light intensity value is still not within the preset threshold range, the delay value of the light source is set to the delay value closest to the threshold, and the temperature fine adjustment is performed, if the temperature adjustment is unsuccessful, the temperature value of the light source is set to the temperature value closest to the threshold, and the delay fine adjustment is performed, and the above steps are repeated until the adjusted light intensity value is within the preset threshold range.
Further, in the process of sequentially taking values within the preset delay value range, before taking values again, the light intensity value currently detected by the detector may be compared with the light intensity value detected last time, if the light intensity value currently detected is large, the delay value is further increased or decreased on the basis of the current delay value, and if the light intensity value currently detected is small, the delay value is further decreased or increased on the basis of the current delay value, that is, the delay value is debugged reversely. Alternatively, the delay value is 11ps per increment or decrement.
Similarly, in the process of sequentially taking values within the preset temperature value range, before taking values again, the current detected light intensity value of the detector 22 may be compared with the last detected light intensity value, if the current detected light intensity value is larger, the temperature value is further increased or decreased based on the current temperature, and if the current detected light intensity value is smaller, the temperature value is further decreased or increased based on the current temperature, that is, the reverse debugging temperature value. Alternatively, the temperature value is 0.1 ℃ per increment or decrement.
The light source detection and correction method provided by the invention can find the drift condition of the light source in time, correct the drift condition in time and greatly reduce the cycle and complexity of the drift correction of the light source.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The light source detection and correction system is characterized by comprising a coupler, a filter, a detector and a control module;
the coupler is used for transmitting part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter is used for filtering the part of the light rays and transmitting the part of the light rays to the detector; the bandwidth of the filter is matched with the spectral line width of the light source;
the detector is used for detecting the light intensity of the partial light and transmitting the detected light intensity value to the control module;
the control module is used for judging whether the light source drifts according to the detected light intensity value and correcting the light source after judging that the light source drifts.
2. The system of claim 1, wherein the control module determines whether the light source drifts according to the detected light intensity value comprises determining whether the light intensity value is within a preset threshold range, if so, the light source does not drift, and if not, the light source drifts;
the control module corrects the light source by carrying out temperature fine adjustment on the light source, or carrying out time delay fine adjustment and temperature fine adjustment on the light source.
3. The system of claim 1 or 2, wherein the light source is an injection-locked light source comprising a master laser, a slave laser, and a circulator;
the first end of the circulator is connected with the master laser, the second end of the circulator is connected with the slave laser, and the third end of the circulator is connected with the coupler;
the circulator is used for transmitting the laser emitted by the master laser to the slave laser so as to perform injection locking on the emitted laser of the slave laser;
the circulator is also used for transmitting the laser light emitted from the laser to the coupler, so that the coupler transmits part of the light in the laser light emitted from the laser to the filter.
4. The system of claim 1, wherein the detector is a single photon detector; the control module is an FPGA chip, an MCU or a micro CPU.
5. The system of claim 1, further comprising a power detection circuit;
the light intensity value detected by the detector is transmitted to the control module after being detected by the power detection circuit.
6. A light source detection and correction method is applied to the light source detection and correction system of any one of claims 1 to 5, and comprises the following steps:
the coupler transmits part of light emitted by the light source to the filter so as to realize online detection of the light source;
the filter filters the part of the light rays and transmits the part of the light rays to the detector;
the detector detects the light intensity of the partial light and transmits the detected light intensity value to the control module;
and the control module judges whether the light source drifts according to the detected light intensity value, and if so, the light source is corrected.
7. The method of claim 6, wherein determining whether the light source drifts based on the detected light intensity value comprises:
judging whether the light intensity value is within a preset threshold range;
if so, judging that the light source does not drift;
if not, determining that the light source drifts.
8. The method of claim 6 or 7, wherein correcting the light source comprises:
carrying out temperature fine adjustment on the light source;
or carrying out time delay fine adjustment and temperature fine adjustment on the light source.
9. The method of claim 8, wherein temperature trimming the light source comprises:
adjusting the temperature of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, continuously adjusting the temperature of the light source until the light source is judged not to have drifted according to the light intensity value detected by the detector;
if not, the correction flow is ended.
10. The method of claim 8, wherein the performing delay fine tuning and temperature fine tuning on the light source comprises:
adjusting the delay value of the light source, and judging whether the light source drifts according to the light intensity value detected by the detector;
if so, adjusting the temperature of the light source, if the light source is still judged to have drift according to the light intensity value detected by the detector, adjusting the delay value of the light source, and circulating the steps until the light source is judged not to have drift according to the light intensity value detected by the detector;
if not, the correction flow is ended.
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