CN111510210A - Parallel optical receiving module optical power test system - Google Patents
Parallel optical receiving module optical power test system Download PDFInfo
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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Abstract
The invention discloses a parallel light receiving module optical power test system.A host controls the output of an attenuator and the switching of an optical switch group; collecting response current of each channel of the light receiving module to be calibrated and optical power of a reference channel; obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel; the method comprises the steps of fitting the response current of each channel of the light receiving module to be calibrated with the received light power of the corresponding channel to obtain the light power fitting curve of each channel of the light receiving module to be calibrated, obtaining the light power fitting curve coefficient of each channel of the light receiving module to be calibrated, completing the received light power calibration function of the light receiving module to be calibrated, greatly reducing artificially introduced errors, simultaneously calibrating the multiple channels, and solving the problems of long time consumption and low efficiency in the prior art for the light power calibration of the parallel light receiving module.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a parallel light receiving module optical power test system.
Background
At present, all parallel optical modules realize a digital monitoring function, wherein optical power drop is an important monitoring index in an optical link. However, the relation between the backlight current received by the multi-path parallel optical module and the optical power is influenced by factors such as coupling, the problems of inconsistency between channels and inconsistency among batches exist, and in order to ensure the accuracy of monitoring the optical power, calibration and optical power detection in a full temperature area/full power range need to be carried out on the monitored optical power of the parallel optical module before delivery.
The early emitted optical power can be calibrated and detected by adopting a multi-channel optical power meter to improve the production efficiency. However, the optical power value is measured by disconnecting the optical link when the input optical power is received, and the system error and the risk of human error are easily introduced by repeatedly plugging and unplugging the optical fiber, so that the defects of long time consumption, low efficiency and the like exist; or the backlight current is adjusted to change the light power value through the relation between the backlight current and the light power of the multipath parallel light emitting module, but the mode has the risk of introducing larger errors and has higher requirements on the parallel light emitting module.
Disclosure of Invention
The invention provides a parallel light receiving module optical power testing system, which solves the problems of long time consumption and low efficiency of parallel light receiving module optical power calibration in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a parallel light receiving module optical power test system comprises a host, a light source, an attenuator, an optical switch group and an optical power meter; the light source is connected with the input end of the attenuator, the output end of the attenuator is connected with the input channel of the optical switch group, one output channel of the optical switch group is selected as a reference channel, and the reference channel is connected with the optical power meter; the other output channels of the optical switch group are correspondingly connected with the channels of the optical receiving module to be calibrated;
the calibration process of the light receiving module to be calibrated includes:
(1) the host machine controls the output of the attenuator and the channel switching of the optical switch group;
(2) collecting response current of each channel of the light receiving module to be calibrated and optical power of a reference channel;
(3) obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel;
(4) and fitting the response current of each channel of the light receiving module to be calibrated with the received light power of the corresponding channel to obtain a light power fitting curve of each channel of the light receiving module to be calibrated, and obtaining the light power fitting curve coefficient of each channel of the light receiving module to be calibrated.
Further comprising a calibration optimization process after step (4), said calibration optimization process comprising the steps of:
judging whether a channel with the receiving optical power smaller than a set optical power threshold exists in the optical receiving module to be calibrated;
if yes, judging whether the channel has received light power with fitting error exceeding a set error threshold value;
if so, obtaining response current corresponding to the received light power of which the fitting error exceeds a set error threshold value in the channel, selecting a maximum value from the response current, taking the maximum value as a boundary point, controlling the attenuator to output different light signals again, collecting the response current of the channel of the light receiving module to be calibrated and the light power of the reference channel again, obtaining the received light power of the channel of the light receiving module to be calibrated again according to the compensation coefficients among the output channels of the optical switch group and the light power of the reference channel, and performing segment fitting on the obtained response current of the channel and the received light power to obtain a light power fitting curve of the channel and obtain a light power fitting curve coefficient of the channel.
Still further, after the step (4), a calibration optimization process is further included, and the calibration optimization process includes the following steps:
judging whether a channel with the receiving optical power smaller than a set optical power threshold exists in the optical receiving module to be calibrated;
if yes, judging the goodness of fit R of the optical power fitting curve of the channel2Whether the value is less than a set goodness threshold value;
if so, the response current corresponding to the set optical power threshold is taken as a demarcation point, the attenuator is controlled again to output different optical signals, the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are acquired again, the received optical power of the channel of the optical receiving module to be calibrated is acquired again according to the compensation coefficient among the output channels of the optical switch group and the optical power of the reference channel, the acquired response current of the channel and the received optical power are subjected to segment fitting to obtain an optical power fitting curve of the channel, and the optical power fitting curve coefficient of the channel is acquired.
Further, the piecewise fitting refers to performing linear fitting respectively.
Further, the piecewise fitting means that one of the segments is subjected to linear fitting, and the other segment is subjected to quadratic polynomial fitting.
Further, step (4) is followed by a detection process, wherein the detection process comprises the following steps:
(5) the host machine controls the attenuator to output different optical signals;
(6) collecting the monitoring optical power of each channel of the optical receiving module to be calibrated and the optical power of a reference channel;
(7) obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel;
(8) judging whether a channel with a difference value between the monitored optical power and the received optical power not within a set difference value range exists in the optical receiving module to be calibrated; if yes, the channel is recalibrated or each channel of the optical receiving module to be calibrated is recalibrated.
Further, the calibration of the optical switch group is performed at set time intervals, and the calibration step includes the following steps:
the host controls the output of the attenuator;
measuring the power value of each output channel of the optical switch group by adopting a multi-channel optical power meter;
and obtaining and storing the compensation coefficient among the output channels of the optical switch group according to the power value of each output channel of the optical switch group.
Furthermore, the optical switch group comprises a reference optical switch and m 1 × N optical switches, wherein m is a positive integer larger than or equal to 1, N is a positive integer larger than or equal to 2, and N1 is a positive integer larger than or equal to 2;
an input channel of the reference optical switch is connected with an output end of the attenuator, one output channel of the reference optical switch is used as a reference channel to be connected with the optical power meter, and input channels of the m 1 × N optical switches are correspondingly connected with the other output channels of the reference optical switch;
if N is larger than or equal to the number N1 of the channels of the light receiving module to be calibrated, selecting N1 output channels of one 1 × N optical switch to be correspondingly connected with N1 channels of the light receiving module to be calibrated;
if N is less than the number N1 of the channels of the optical receiving module to be calibrated, N1/N is rounded up to obtain j, and N1 output channels of j 1 × N optical switches are selected to be correspondingly connected with N1 channels of the optical receiving module to be calibrated.
Further, the optical switch group is calibrated at set time intervals, and the calibration step comprises the following steps:
the host controls the output of the attenuator;
measuring power values of each output channel of the reference optical switch and each output channel of the m 1 × N optical switches by adopting a multi-channel optical power meter;
and obtaining and storing compensation coefficients among the output channels of the optical switch group according to the power values of the output channels of the reference optical switch and the output channels of the m 1 × N optical switches.
Further, the set error threshold is 60% of the allowable error.
Compared with the prior art, the invention has the advantages and positive effects that: in the optical power test system of the parallel optical receiving module, the host controls the output of the attenuator and the switching of the optical switch group; collecting response current of each channel of the light receiving module to be calibrated and optical power of a reference channel; obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel; the method comprises the steps of fitting the response current of each channel of the light receiving module to be calibrated with the received light power of the corresponding channel to obtain the light power fitting curve of each channel of the light receiving module to be calibrated, obtaining the light power fitting curve coefficient of each channel of the light receiving module to be calibrated, completing the received light power calibration function of the light receiving module to be calibrated, greatly reducing artificially introduced errors, simultaneously calibrating the multiple channels, and solving the problems of long time consumption and low efficiency in the prior art for the light power calibration of the parallel light receiving module.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a parallel optical receiving module optical power testing system according to the present invention;
FIG. 2 is a flowchart of one embodiment of a calibration process of the parallel optical receiving module optical power test system proposed in the present invention;
FIG. 3 is a flowchart of one embodiment of a calibration process and a detection process of the parallel optical receiving module optical power test system proposed by the present invention;
fig. 4 is a flowchart of another embodiment of the calibration process and the detection process of the parallel optical receiving module optical power testing system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The optical power test system of the parallel optical receiving module of the embodiment mainly includes a host, a light source, an attenuator, an optical switch group, an optical power meter, and the like, as shown in fig. 1. Host computer passing through I2C, communicating with a light receiving module to be calibrated; the host is respectively communicated with the attenuator and the optical switch group through the switch, and the communication between the host and the optical switch group and the attenuator is realized through TcpClient types; the host machine respectively controls the attenuator and the optical switch group; the host computer controls the optical power meter through the serial port.
The light source is connected with the input end of the attenuator, the output end of the attenuator is connected with the input channel of the optical switch group, one output channel of the optical switch group is selected as a reference channel, and the reference channel is connected with the optical power meter; the other output channels of the optical switch group are correspondingly connected with the channels of the optical receiving module to be calibrated. The attenuator attenuates light emitted by the light source to obtain the full power range of the optical module, outputs optical signals to the optical switch group, and transmits the optical signals to the optical power meter and the optical receiving module to be calibrated through the optical switch group. In the present embodiment, it is assumed that the light receiving module to be calibrated includes N1 channels, and N1 is an integer greater than 1. The N1 channels of the light receiving module to be calibrated are correspondingly connected with the N1 output channels of the optical switch group one by one.
The calibration process of the light receiving module to be calibrated of the present embodiment includes the following steps, as shown in fig. 2.
Firstly, the interconnection of network ports of all devices of the system is completed, the optical power meter is connected with a host through a serial port, and the optical receiving module to be calibrated passes through I2C, connecting with a host; then the system starts and loads the compensation coefficient files among all output channels in the optical switch group; the following steps are performed.
Step S1: the host machine controls the output of the attenuator and the switching of the channels of the optical switch group.
The host controls the attenuation value of the attenuator according to a plurality of optical power points which need to be calibrated, thereby controlling the output of the attenuator.
The host machine controls the switching of the channels of the optical switch group, the optical switch group switches the optical path of the received optical signal according to the received control signal of the host machine, and the optical switch group sequentially provides optical signals for the N1 channels of the optical receiving module to be calibrated.
Step S2: and collecting the response current of each channel of the light receiving module to be calibrated and the optical power of the reference channel, and uploading the response current and the optical power to the host. The optical power of the reference channel is collected by an optical power meter and uploaded to the host.
Step S3: and the host acquires the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among the output channels of the optical switch group and the optical power of the reference channel.
The compensation coefficients between the output channels of the optical switch group are preset and stored. The received optical power of each channel of the optical receiving module to be calibrated is approximately equal to the optical power of the output channel of the corresponding connected optical switch group, so that the received optical power of each channel of the optical receiving module to be calibrated can be calculated according to the compensation coefficient among the output channels of the optical switch group and the optical power of the reference channel.
Step S4: the host machine fits the response current of each channel of the light receiving module to be calibrated with the receiving light power of the corresponding channel to obtain a light power fitting curve of each channel of the light receiving module to be calibrated, obtains the light power fitting curve coefficient of each channel of the light receiving module to be calibrated, and stores and writes the light power fitting curve coefficient into the light receiving module to be calibrated to finish the calibration process.
In this embodiment, the host starts multi-thread task processing, one thread collects the optical power of a reference channel in real time, calculates the received optical power of all channels according to a compensation coefficient, switches the optical switch group to collect the response current of each channel, and fits the response current and the received optical power to obtain a fit curve and a coefficient thereof; and the other thread stores data in real time, so that the data tracing processing at the later stage is facilitated.
The calibration process may calibrate each channel of the optical receiving module, or may calibrate each channel individually for each individual channel.
The main fitting relation between the response current and the received optical power is determined according to the performance of the optical receiving module, the fitting relation may change near high sensitivity, and whether the fitting direction is a piecewise linear relation or a piecewise ascending order can be preset. Therefore, in order to improve the accuracy of the fitted curve coefficients, a calibration optimization process is further included after step S4, and the calibration optimization process includes the following steps, as shown in fig. 3.
S411: the host machine judges whether the receiving optical power of the optical receiving module to be calibrated is smaller than a set optical power threshold value P0The channel of (2). In the present embodiment, the optical power threshold P is set0Was-12 dBm.
If yes, the received optical power in the optical receiving module to be calibrated is smaller than the set optical power threshold value P0S412 is performed.
S412: the host judges whether the channel has received optical power with fitting error exceeding a set error threshold. In the present embodiment, the error threshold is set to 60% of the allowable error. If the allowable error is 1dB, the error threshold is set to 0.6 dB.
If yes, S413 is performed.
S413: obtaining the response current corresponding to the received optical power of which the fitting error exceeds a set error threshold value in the channel, and selecting the maximum RSSI0With maximum RSSI0Is the demarcation point. Since there may be more received optical powers in the channel for which the fitting error exceeds the set error threshold, there are more corresponding response currents, and a maximum value needs to be selected from these response currents as a demarcation point. Selecting demarcation point RSSI0Then, the attenuator is controlled again to output different optical signals, and the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are collected again (by RSSI)0Collecting a plurality of data points for each section of the demarcation point), obtaining the receiving light power of the channel of the light receiving module to be calibrated again according to the compensation coefficient among the output channels of the optical switch group and the light power of the reference channel, and then obtaining the maximum RSSI (received signal strength indicator) of the channel of the light receiving module to be calibrated0And performing segmented fitting on the obtained response current of the channel and the received light power for the demarcation point to obtain a light power fitting curve of the channel, and obtaining and storing a light power fitting curve coefficient of the channel.
If the fitting error of the optical power fitting curve obtained after the piecewise fitting still exceeds the set error threshold, the system stops the calibration optimization and gives prompt information, one or more demarcation points are required to be manually appointed, the attenuator is controlled again to output different optical signals, the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are collected again (a plurality of data points are collected in each segment), the receiving optical power of the channel of the optical receiving module to be calibrated is obtained again according to the compensation coefficients among the output channels of the optical switch group and the optical power of the reference channel, then the response current and the receiving optical power of the channel obtained again are subjected to the piecewise fitting again through the manually appointed demarcation points, the optical power fitting curve coefficient of the channel is obtained, and the optical power fitting curve coefficient of the channel is stored. If the fitting error of the optical power fitting curve obtained after the piecewise fitting still exceeds the set error threshold, manually appointing the demarcation point again, repeatedly acquiring data for piecewise fitting, and if the demarcation point is manually appointed for 3 times, the fitting error of the optical power fitting curve obtained after the piecewise fitting still exceeds the set error threshold, exiting the calibration optimization process and giving an optical power repair prompt of the optical module.
Through the steps S411 to S413, the fitting curve coefficient is optimized to obtain the optimized optical power fitting curve coefficient, so that the optimal fitting curve coefficient in the full power range can be obtained. The subsequent detection processes of S5 to S8 may be performed only when the fitting errors of all the channels of the light receiving module do not exceed the set error threshold.
In the present embodiment, the error threshold is set to 60% of the allowable error. If the set error threshold is too large, the fitting curve coefficient is not effectively optimized, and the accuracy is low; if the set error threshold is too small, the fitting is excessive, and the resource waste is caused. Therefore, the value is selected by setting an error threshold, so that an accurate fitting curve coefficient can be obtained, and waste of memory resources is avoided.
Assuming that the primary fit relationship is a linear relationship (first order curve relationship), the direction of the adaptive fit is a segment of the two linear relationships. As a preferred design of this embodiment, the piecewise fitting refers to performing linear fitting (first-order curve fitting) respectively, the fitting process is simple, and a relatively accurate fitting curve coefficient can be obtained, using RSSI0The piecewise function fitted to the cut-off point is as follows, where x is the response current.
If the number of the segments is more than 2, the 1 st demarcation point is RSSI0The 2 nd demarcation point is (RSSI)min+RSSI0)/2，RSSIminIs the minimum value of the response current of the channel collected. I.e. in [ RSSImin,RSSI0]And determining other demarcation points in the interval by adopting a bisection method.
Assuming that the main fitting relationship is a linear relationship (a first-order curve relationship), and the direction of the adaptive fitting is ascending (ascending from the first-order curve relationship to a second-order curve relationship), as another preferred design scheme of this embodiment, the piecewise fitting means that one of the segments is subjected to linear fitting (first-order curve fitting), and the other segment is subjected to second-order polynomial fitting (second-order curve fitting), so that a relatively accurate fitting curve coefficient can be obtained. By RSSI0The piecewise function fitted to the cut-off point is as follows, where x is the response current.
As another preferred design of this embodiment, in order to improve the accuracy of the coefficients of the fitted curve, the calibration optimization process includes the following steps, which are shown in fig. 4.
S421: the host machine judges whether the receiving optical power of the optical receiving module to be calibrated is smaller than a set optical power threshold value P0The channel of (2). In the present embodiment, the optical power threshold P is set0Was-12 dBm.
If yes, the received optical power in the optical receiving module to be calibrated is smaller than the set optical power threshold value P0S422 is performed.
S422: the host judges the goodness of fit R of the optical power fitting curve of the channel2Whether it is less than a set goodness threshold. In the present embodiment, the goodness threshold is set to 0.98.
If yes, go to S423.
S423: to set the optical power threshold P0Corresponding response current RSSI1For the demarcation point, the attenuator is controlled again to output different optical signals, and the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are collected again (by RSSI)1Collecting a plurality of data points for each section of the demarcation point), and obtaining the receiving light power of the channel of the light receiving module to be calibrated again according to the compensation coefficient among the output channels of the optical switch group and the light power of the reference channelRate, then in RSSI1And performing segmented fitting on the obtained response current of the channel and the received light power for the demarcation point to obtain a light power fitting curve of the channel, and obtaining and storing a light power fitting curve coefficient of the channel.
If the goodness of fit R of the optical power fitting curve obtained after the piecewise fitting2If the value is still less than the set goodness threshold, the system stops the calibration optimization and gives prompt information, the attenuator is required to be manually appointed to output different optical signals, the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are collected again (a plurality of data points are collected in each section), the receiving optical power of the channel of the optical receiving module to be calibrated is obtained again according to the compensation coefficients among the output channels of the optical switch group and the optical power of the reference channel, then the newly obtained response current of the channel and the receiving optical power are subjected to section fitting again by the manually appointed demarcation point to obtain an optical power fitting curve of the channel, and the optical power fitting curve coefficient of the channel is obtained and stored. If the goodness of fit R of the optical power fitting curve obtained after the piecewise fitting is carried out2And if the measured value is still less than the set goodness threshold value, the calibration optimization process is exited, and the optical power repair prompt of the optical module is given.
Through the steps S421 to S423, the fitting curve coefficient is optimized to obtain the optimized optical power fitting curve coefficient, so that the optimal fitting curve coefficient in the full power range can be obtained. Goodness of fit R only if all channels of the light receiving module2If the measured value is not less than the set goodness threshold, the subsequent detection processes from S5 to S8 may be performed.
Assuming that the primary fit relationship is a linear relationship (first order curve relationship), the direction of the adaptive fit is a segment of the two linear relationships. As a preferred design of this embodiment, the piecewise fitting refers to performing linear fitting (first-order curve fitting) respectively, the fitting process is simple, and a relatively accurate fitting curve coefficient can be obtained, using RSSI1The piecewise function fitted to the cut-off point is as follows, where x is the response current.
Assuming that the main fitting relationship is a linear relationship (a first-order curve relationship), and the direction of the adaptive fitting is ascending (ascending from the first-order curve relationship to a second-order curve relationship), as another preferred design scheme of this embodiment, the piecewise fitting means that one of the segments is subjected to linear fitting (first-order curve fitting), and the other segment is subjected to second-order polynomial fitting (second-order curve fitting), so that a relatively accurate fitting curve coefficient can be obtained. By RSSI1The piecewise function fitted to the cut-off point is as follows, where x is the response current.
In the optical power test system of the parallel optical receiving module of the embodiment, the host controls the output of the attenuator and the switching of the optical switch group; collecting response current of each channel of the light receiving module to be calibrated and optical power of a reference channel; obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel; the method comprises the steps of fitting the response current of each channel of the light receiving module to be calibrated with the received light power of the corresponding channel to obtain the light power fitting curve of each channel of the light receiving module to be calibrated, obtaining the light power fitting curve coefficient of each channel of the light receiving module to be calibrated, completing the received light power calibration function of the light receiving module to be calibrated, greatly reducing human introduced errors, calibrating multiple channels simultaneously, and being short in time consumption, high in efficiency and high in accuracy.
After the calibration of the light receiving module to be calibrated, in order to verify the calibrated light receiving module, the light receiving module to be calibrated needs to be detected, so that the embodiment further includes a detection process of the light receiving module after S4 (calibration process) or after S413 and S423 (calibration optimization process), and the detection process includes the following steps, as shown in fig. 3 and fig. 4.
Firstly, the interconnection of network ports of all devices of the system is completed, the optical power meter is connected with a host through a serial port, and the optical receiving module to be calibrated passes through I2C, connecting with a host; then loading compensation coefficients among all output channels in the optical switch group; the following steps are performed.
Step S5: the host computer controls the attenuator to output a different optical signal so that the output of the attenuator is different from the output of the attenuator in step S1.
In this step, the host machine controls the attenuation value of the attenuator according to the plurality of detection optical power points, thereby controlling the output of the attenuator. Since the detected optical power point in this step is different from the calibration optical power point in S1, the output of the attenuator in this step is different from the output of the attenuator in S1.
Step S6: and collecting the monitoring optical power of each channel of the optical receiving module to be calibrated and the optical power of the reference channel, and uploading the optical powers to the host.
Step S7: and the host acquires the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among the output channels of the optical switch group and the optical power of the reference channel.
Step S8: the host machine judges whether the light receiving module to be calibrated has a channel of which the difference value between the monitored light power and the received light power is not in the set difference value range.
If yes, judging that the channel is unqualified, sending out warning information, adding 1 to the cycle number C, if C exceeds the set number (such as 5), directly quitting the detection process, giving a quit prompt, and resetting the cycle number C; if the cycle number C does not exceed the set number, returning to the step S1, and recalibrating each channel of the light receiving module to be calibrated; or recalibrate only to that channel.
If not, the channels are qualified, the detection is judged to be qualified, and the cycle number C is reset.
Through steps S5 to S8, the light receiving module to be calibrated is detected, and if the detection is not qualified, the unqualified channel is recalibrated, or each channel of the whole light receiving module to be calibrated is recalibrated, so as to further improve the reliability and accuracy of the calibration process.
In order to ensure that the system is monitored accurately, the equipment in the system needs to be calibrated after being used for the first time or after being used for a period of time, wherein the most important is the calibration of the optical switch group. The multichannel optical power meter is adopted to complete multichannel calibration of the optical switch group at one time, obtain compensation coefficients among all output channels in a full power range, and write the compensation coefficients into a compensation coefficient file for storage, so that loading after software is started is facilitated.
In this embodiment, the optical switch set is calibrated at set intervals to obtain an accurate compensation coefficient, and the calibration step of the optical switch set mainly includes the following steps:
(1) the host controls the output of the attenuator.
(2) And a multi-channel optical power meter is adopted to measure the power value of each output channel of the optical switch group respectively.
(3) And obtaining the compensation coefficients among the output channels of the optical switch group according to the power values of the output channels of the optical switch group, and storing the compensation coefficients to a compensation coefficient file, so that the later test system can be loaded conveniently during working.
The power values of all output channels of the optical switch group have a linear relation, and the compensation coefficient among all output channels can be calculated according to the power values of all output channels. Assuming that the optical switch group has M output channels, the power values of the output channels detected by the multi-channel optical power meter are P1, P2, P3, … … and PM, respectively. Optionally selecting one of the output channels as a reference channel; for example, the 1 st output channel is selected as the reference channel.
The power value of the 1 st output channel is P1;
the power value P2 of the 2 nd output channel is d 1P 1+ E1;
the power value P3 of the 3 rd output channel is d2 × P1+ E2;
the power value P4 of the 4 th output channel is d 3P 1+ E3;
……
the power value of the Mth output channel is PM & ltdm-1 & gtP 1+ Em-1.
The power values of the 2 nd to M th output channels are linear functions of P1, respectively. The compensation coefficients between the 2 nd to M th output channels and the 1 st output channel include the first order coefficient and the constant term coefficient of the above-described first order function. d1, d2, d3, … … dm-1, E1, E2, E3, … … and Em-1 are constants, and d1, d2, d3, … … dm-1, E1, E2, E3, … … and Em-1 are compensation coefficients between the 2 nd to M th output channels and the 1 st output channel. Similarly, the compensation coefficient between each output channel of the optical switch group can be calculated. Therefore, when the power value of one output channel is known, the power values of other output channels can be calculated according to the compensation coefficients among the output channels.
The 1 × N multi-channel optical switch can realize the output of the corresponding N channel of the 1-channel input, connects a plurality of optical fibers to the optical receiving module, controls the switching sequence of the optical switch through a computer, realizes the monitoring and the detection of the multi-channel parallel optical receiving module, and transmits the result back to the host.
In this embodiment, the optical switch group includes a reference optical switch and m 1 × N optical switches, where a 1 × N optical switch means that the optical switch has one input channel and N output channels, the reference optical switch also has 1 input channel and N output channels, m is a positive integer greater than or equal to 1, N is a positive integer greater than or equal to 2, and N1 is a positive integer greater than or equal to 2.
The input channel of the reference optical switch is connected with the output end of the attenuator, one output channel of the reference optical switch is used as a reference channel to be connected with the optical power meter, and the input channels of the m 1 × N optical switches are correspondingly connected with the other output channels of the reference optical switch.
And determining the number of the selected optical switches according to the number of the channels of the optical receiving module to be calibrated.
If N is greater than or equal to the number N1 of channels of the optical receiver module to be calibrated, one 1 × N optical switch can meet the requirement, and therefore, N1 output channels of one 1 × N optical switch are selected to be correspondingly connected with N1 channels of the optical receiver module to be calibrated, for example, N is 50, N1 is 48, and 48 output channels of the 1 × N optical switch are correspondingly connected with 48 channels of the optical receiver module to be calibrated.
If N < the number of channels N1 of the optical receiving module to be calibrated, N1/N is rounded up to obtain j, N1 output channels of j 1 × N optical switches are selected to correspond to N1 channels connected to the optical receiving module to be calibrated, for example, N10, N1 48, j 5, 48 output channels of 5 1 × N optical switches are selected to correspond to 48 channels connected to the optical receiving module to be calibrated, if N1/N is divisible, N1/N j is selected, for example, if N12, N1 48, j 4, 48 output channels of 41 × N optical switches are selected to correspond to 48 channels connected to the optical receiving module to be calibrated.
The optical switch group can be used for expanding the optical power calibration and detection of more channels by interconnecting a plurality of 1 × N optical switches, and the number of the channels can be expanded by adopting the design, so that the application range of the optical switch group is wide.
In this embodiment, the calibration of the reference optical switch and the m 1 × N optical switches is performed at set time intervals to obtain an accurate compensation coefficient, and the calibration step of the optical switch group mainly includes the following steps:
(1) the host controls the output of the attenuator.
(2) And a multi-channel optical power meter is adopted to respectively measure the power value of each output channel of the reference optical switch and the power value of each output channel of the m 1 × N optical switches.
(3) And obtaining compensation coefficients among the output channels of the optical switch group according to the power values of the output channels of the reference optical switch and the power values of the output channels of the m 1 × N optical switches, and storing the compensation coefficients to a compensation coefficient file, so that the later-stage test system can be loaded during working.
And selecting one output channel of the reference optical switch as a reference channel, wherein the power value of the reference channel is P11, the power values of the other output channels of the reference optical switch and the output channels of the m 1 × N optical switches are linear functions of P11, and the linear term coefficient and the constant term coefficient of the linear function are compensation coefficients between the other output channels of the reference optical switch and the output channels of the m 1 × N optical switches and the reference channel.
The parallel optical receiving module optical power test system of the embodiment reduces human errors and plugging errors, can simultaneously calibrate and detect multiple channels of the optical receiving module to be calibrated, and improves the production efficiency.
The multiple devices of the embodiment are interconnected through the switch, wherein the key is the optical switch group, the introduction of the optical switch group solves the problem that the system is huge and complicated due to the introduction of multiple attenuators, and meanwhile, the expansion of the optical switch group can realize the one-time calibration of more channels, so that the production efficiency is obviously improved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A parallel optical receiving module optical power test system is characterized in that: the system comprises a host, a light source, an attenuator, an optical switch group and an optical power meter;
the light source is connected with the input end of the attenuator, the output end of the attenuator is connected with the input channel of the optical switch group, one output channel of the optical switch group is selected as a reference channel, and the reference channel is connected with the optical power meter; the other output channels of the optical switch group are correspondingly connected with the channels of the optical receiving module to be calibrated;
the calibration process of the light receiving module to be calibrated includes:
(1) the host machine controls the output of the attenuator and the channel switching of the optical switch group;
(2) collecting response current of each channel of the light receiving module to be calibrated and optical power of a reference channel;
(3) obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel;
(4) and fitting the response current of each channel of the light receiving module to be calibrated with the received light power of the corresponding channel to obtain a light power fitting curve of each channel of the light receiving module to be calibrated, and obtaining the light power fitting curve coefficient of each channel of the light receiving module to be calibrated.
2. The system of claim 1, wherein: a calibration optimization process is also included after step (4), the calibration optimization process including the steps of:
judging whether a channel with the receiving optical power smaller than a set optical power threshold exists in the optical receiving module to be calibrated;
if yes, judging whether the channel has received light power with fitting error exceeding a set error threshold value;
if so, obtaining response current corresponding to the received light power of which the fitting error exceeds a set error threshold value in the channel, selecting a maximum value from the response current, taking the maximum value as a boundary point, controlling the attenuator to output different light signals again, collecting the response current of the channel of the light receiving module to be calibrated and the light power of the reference channel again, obtaining the received light power of the channel of the light receiving module to be calibrated again according to the compensation coefficients among the output channels of the optical switch group and the light power of the reference channel, and performing segment fitting on the obtained response current of the channel and the received light power to obtain a light power fitting curve of the channel and obtain a light power fitting curve coefficient of the channel.
3. The system of claim 1, wherein: a calibration optimization process is also included after step (4), the calibration optimization process including the steps of:
judging whether a channel with the receiving optical power smaller than a set optical power threshold exists in the optical receiving module to be calibrated;
if yes, judging the goodness of fit R of the optical power fitting curve of the channel2Whether the value is less than a set goodness threshold value;
if so, the response current corresponding to the set optical power threshold is taken as a demarcation point, the attenuator is controlled again to output different optical signals, the response current of the channel of the optical receiving module to be calibrated and the optical power of the reference channel are acquired again, the received optical power of the channel of the optical receiving module to be calibrated is acquired again according to the compensation coefficient among the output channels of the optical switch group and the optical power of the reference channel, the acquired response current of the channel and the received optical power are subjected to segment fitting to obtain an optical power fitting curve of the channel, and the optical power fitting curve coefficient of the channel is acquired.
4. A system according to claim 2 or 3, characterized in that: the piecewise fitting refers to performing linear fitting respectively.
5. A system according to claim 2 or 3, characterized in that: the piecewise fitting refers to linear fitting of one segment and quadratic polynomial fitting of the other segment.
6. The system of claim 1, wherein: a detection process is further included after the step (4), and the detection process comprises the following steps:
(5) the host machine controls the attenuator to output different optical signals;
(6) collecting the monitoring optical power of each channel of the optical receiving module to be calibrated and the optical power of a reference channel;
(7) obtaining the receiving optical power of each channel of the optical receiving module to be calibrated according to the compensation coefficient among each output channel of the optical switch group and the optical power of the reference channel;
(8) judging whether a channel with a difference value between the monitored optical power and the received optical power not within a set difference value range exists in the optical receiving module to be calibrated; if yes, the channel is recalibrated or each channel of the optical receiving module to be calibrated is recalibrated.
7. The system of claim 1, wherein: calibrating the optical switch group at set time intervals, wherein the calibrating step comprises the following steps:
the host controls the output of the attenuator;
measuring the power value of each output channel of the optical switch group by adopting a multi-channel optical power meter;
and obtaining and storing the compensation coefficient among the output channels of the optical switch group according to the power value of each output channel of the optical switch group.
8. The system of claim 1, wherein the set of optical switches comprises a reference optical switch, m 1 × N optical switches, m being a positive integer greater than or equal to 1, N being a positive integer greater than or equal to 2, N1 being a positive integer greater than or equal to 2;
an input channel of the reference optical switch is connected with an output end of the attenuator, one output channel of the reference optical switch is used as a reference channel to be connected with the optical power meter, and input channels of the m 1 × N optical switches are correspondingly connected with the other output channels of the reference optical switch;
if N is larger than or equal to the number N1 of the channels of the light receiving module to be calibrated, selecting N1 output channels of one 1 × N optical switch to be correspondingly connected with N1 channels of the light receiving module to be calibrated;
if N is less than the number N1 of the channels of the optical receiving module to be calibrated, N1/N is rounded up to obtain j, and N1 output channels of j 1 × N optical switches are selected to be correspondingly connected with N1 channels of the optical receiving module to be calibrated.
9. The system of claim 8, wherein: calibrating the optical switch group at set time intervals, wherein the calibrating step comprises the following steps:
the host controls the output of the attenuator;
measuring power values of each output channel of the reference optical switch and each output channel of the m 1 × N optical switches by adopting a multi-channel optical power meter;
and obtaining and storing compensation coefficients among the output channels of the optical switch group according to the power values of the output channels of the reference optical switch and the output channels of the m 1 × N optical switches.
10. A system according to claim 2 or 3, characterized in that: the set error threshold is 60% of the allowable error.
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