Optical fiber link automatic detection device and method

Abstract

The invention relates to the field of communication monitoring, and discloses an optical fiber link automatic detection device and method, and the device comprises a multi-light-source generation device and an optical power monitoring device. The multi-light-source generating device comprises an automatic temperature control circuit and an automatic light power control circuit which are used for controlling the temperature and power of light sources; the optical power monitoring equipment is electrically connected with the multi-light-source generating equipment, and is used for monitoring an optical signal sent by the multi-light-source generating equipment and decoding the optical signal so as to determine the corresponding relation of optical fibers at the two ends of the optical cable; the optical fiber link monitoring system has the functions of optical fiber fault screening and optical fiber troubleshooting, optical fiber faults or light attenuation can be judged according to a checking program set by the system, and the optical fiber link monitoring accuracy and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication monitoring, in particular to an optical fiber link automatic detection device and method. BACKGROUND

[0002] Traditional optical power testing is manually measured by plugging and unplugging, and the switching of optical fibers is continuously performed during the testing process, which seriously affects the accuracy of the test. Although the tester can tighten the optical connector to reduce the access loss, the access loss will be greatly different due to the repeated insertion and removal of the optical fiber, which directly reduces the accuracy of the test. SUMMARY

[0003] The present application aims to provide an optical fiber link automatic detection device and method to solve the technical problem of inaccurate and low-efficiency measurement of existing optical fiber link power measurement caused by manual measurement.

[0004] Specifically, the present application provides an optical fiber link automatic detection device, comprising: a multi-light source generating device and an optical power monitoring device; The multi-light source generating device comprises an automatic temperature control circuit and an automatic optical power control circuit for controlling the temperature and power of the light source. The optical power monitoring device is electrically connected to the multi-light source generating device and is used to monitor the state of the optical signal sent by the multi-light source generating device.

[0005] An optical fiber link automatic detection method based on the optical fiber link automatic detection device, comprising the following steps: S1, calibrating the optical fiber link automatic detection device with a standard light source to obtain a calibration result; S2, analyzing the combined measurement uncertainty of the calibration result; S3, introducing a temperature compensation mechanism based on the uncertainty and using a temperature compensation algorithm to compensate the measurement result.

[0006] The present application has the advantages of fiber fault screening and troubleshooting functions, can judge fiber faults or optical fading problems with a system-set verification program, can support measurement data report generation function after device measurement is completed, can support template import, label template import and export functions, and can automatically fill in test data according to the user-imported template, meeting the demand of on-site rapid testing and rapid report generation. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a simple schematic diagram of the device of the present application; Figure 2 is a schematic diagram of the automatic temperature control circuit. Figure 3 is an automatic optical power control circuit schematic diagram; Figure 4 is an optical-electric conversion circuit schematic diagram; Figure 5 is an analog signal processing circuit schematic diagram; Figure 6 is an MCU control circuit U3-A schematic diagram; Figure 7 is an MCU control circuit U3-B, C, D schematic diagram. DETAILED DESCRIPTION

[0008] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described below with reference to the drawings.

[0009] Before formally describing the present application, the scheme of the present application is first described generally for convenience of understanding.

[0010] Please refer to Figure 1 , the present application provides a kind of optical fiber link automatic detection device, comprising: Multi-light source generating device and optical power monitoring device; Multi-light source generating device includes: automatic temperature control circuit and automatic optical power control circuit, for controlling light source temperature and power; Optical power monitoring device is electrically connected with the multi-light source generating device, for monitoring the optical signal sent by multi-light source generating device, decodes it to determine the corresponding relationship of the optical fiber at both ends of optical cable.

[0011] It should be noted that the generating device and the monitoring device are specifically connected through optical cable, and in engineering application, multiple optical cables are laid at the same time, and the corresponding relationship of the optical cables at both ends cannot be determined when in use. The main function of the device is that the generating device generates encoded optical signals, and the monitoring device determines the corresponding relationship of the optical fibers at both ends of the optical cable by decoding the received optical signals to determine that the optical fiber connected to the receiving port of the device corresponds to the port connected to the generating device.

[0012] It should be noted that the automatic temperature control circuit transmits the temperature change information to the MCU control circuit through the temperature sensor, and the MCU control circuit changes the refrigerating capacity of the refrigerator by controlling the current of the refrigerator, so as to keep the temperature around the light emitting device constant.

[0013] Please refer to Figure 2 , Figure 2 is the schematic diagram of the automatic temperature control circuit of the present application; The automatic temperature control circuit (ATC) includes resistors R1-R5, operational amplifier U2-A, triode Q3 and temperature sensor; One end of the resistor R2 and the resistor R4 is connected with the power supply end V1, the other end of the resistor R4 is electrically connected with the non-inverting input terminal of the operational amplifier U2-A, one end of the resistor R5; the other end of the resistor R2 is electrically connected with the inverting input terminal of the operational amplifier U2-A, one end of the resistor R3, one end of the resistor R1; the other end of the resistor R1 is electrically connected with the output terminal of the operational amplifier U2-A, the base of the transistor Q3; the collector of the transistor Q3 is connected with the power supply end V2; the emitter of the transistor Q3 is electrically connected with one end of the temperature sensor; the other end of the temperature sensor is connected with the refrigerator; the other end of the resistor R5 is connected with the ground, the other end of the resistor R3 is connected with the ground.

[0014] Please refer to Figure 3 , Figure 3 It is the schematic diagram of the automatic optical power control circuit of the application; It should be noted that the automatic optical power control circuit monitors the back light of the light emitting device, determines the light power output of the light emitting device through the back light power, and feeds back to the output end of the driving circuit to control the transmission light power.

[0015] The functional modules of the above-mentioned automatic optical power control circuit (APC) can be realized by the following specific components: The back light detector unit corresponds to the light emitting device D2, and is used for receiving the back light emitted by the laser D1; The sampling circuit unit is mainly composed of a filter amplification circuit composed of the capacitor C1, the resistor R7 and the operational amplifier U1-A, and is used for sampling and preliminarily processing the back light signal; The analog-digital conversion and counting unit is mainly realized by the external MCU control circuit (not completely shown in the figure) Figure 3 , receives the analog signal output by the operational amplifier U1-A and performs analog-digital conversion and counting; The digital-analog conversion and bias current output unit is mainly composed of the operational amplifiers U3-A and U4-A, the transistor Q4, the resistors R8 and R9, and is used for outputting the analog signal for controlling the bias current of the laser; The laser unit corresponds to the light emitting device D1, and is the main body of the laser emission.

[0016] The BEN control signal (burst enable signal) is provided by the external MCU, and is used for controlling the output timing of the bias current.

[0017] It should be noted that the automatic optical power control circuit (APC) comprises: the light emitting devices D1-D2, the transistors Q1, Q2 and Q4, the resistors R6-R9, the capacitors C1-C2, the operational amplifiers U1-A, U3-A and U4-A; The base of the triode Q1 is connected with the power supply terminal +V1, the collector is connected with GND, and the emitter is connected with one end of the resistor R6 and the emitter of the triode Q2; the base of the triode Q2 is electrically connected with the power supply terminal +V2, the collector is electrically connected with the collector of the triode Q4 and the anode of the light emitting device D1; the cathode of the light emitting device D1 is connected with GND, and the other end of the resistor R6 is connected with -V2; The anode of the light emitting device D2 is electrically connected with one end of the capacitor C1, one end of the resistor R7 and the inverting terminal of the operational amplifier U1-A; the cathode of the light emitting device D2 is electrically connected with the other end of the capacitor C1 and the non-inverting terminal of the operational amplifier U1-A; the other end of the resistor R7 is connected with the output terminal of the operational amplifier U1-A; the output terminal of the operational amplifier U1-A is electrically connected with one end of the capacitor C2 and the inverting terminal of the operational amplifier U4-A; the non-inverting terminal of the operational amplifier U4-A is electrically connected with one end of the resistor R8 and the output terminal of the operational amplifier U3-A; the output terminal of the operational amplifier U4-A is electrically connected with the base of the triode Q4; the emitter of the triode Q4 is electrically connected with one end of the resistor R9; the other end of the resistor R9 is connected with -V1; the other end of the resistor R8 is electrically connected with the inverting terminal of the operational amplifier and is commonly connected with VIN; the non-inverting terminal of the operational amplifier U3-A is connected with +5V power supply.

[0018] The automatic optical power control circuit (APC) structure is designed, which comprises a back light detector unit, a sampling circuit unit connected with the output terminal of the back light detector unit, an analog-digital conversion and counting unit connected with the output terminal of the sampling circuit unit, a digital-analog conversion and bias current output unit connected with the output terminal of the analog-digital conversion and counting unit, and a laser unit connected with the output terminal of the digital-analog conversion and bias current output unit; a signal is input into the analog-digital conversion and counting unit, and a BEN control signal (i.e. a burst signal) is simultaneously input into the analog-digital conversion and counting unit.

[0019] The working principle of the automatic optical power control circuit is that the back light detector detects the light signal emitted by the laser, converts the light signal into a voltage signal through a sampling and filtering circuit, converts the voltage signal into a digital signal through an A / D conversion, compares the digital signal with a set value, re-sets the bias current register according to the comparison result, saves the value at the end of the burst signal, and outputs the saved bias current at the beginning of the next burst packet. When the light power emitted by the laser changes, the back light detector detects the change, and the automatic optical power control circuit adjusts the bias current value according to the above-mentioned mode again, thereby forming a digital feedback loop.

[0020] In the continuous emission mode, when the bias current value needs to be adjusted, the MCU control circuit updates the counter value at the APC clock edge and adjusts the output current value. In this mode, the MCU control circuit updates the counter value at the rising edge of the APC clock, and when the burst pulse ends, the counter stops updating and stores the adjusted output current value in the register. When the next burst signal starts, the bias current value is the stored value in the register. When the control circuit updates the bias current at the rising edge of the APC clock while the burst signal is off, the control circuit stores the unconverted error value in the register. When the automatic optical power control circuit works in the continuous mode, the bias current gradually approaches the set value.

[0021] It should be noted that the optical power monitoring device comprises an optical-electric conversion circuit, an analog signal processing circuit and an MCU control circuit.

[0022] The optical-electric conversion circuit demodulates and converts the optical signal generated from the multi-light source generating device to obtain an electric signal; the analog signal processing circuit amplifies and samples the electric signal; and the MCU control circuit calculates and decodes the data in the optical signal based on the sampling data for monitoring.

[0023] It should be noted that the optical-electric conversion circuit and the analog signal processing circuit respectively adopt an optical-electric conversion chip and an analog-digital conversion chip to complete the corresponding functions.

[0024] Please refer to Figure 4 , Figure 4 is a schematic diagram of the optical-electric conversion circuit, which adopts a chip SN74LV4051A to complete the corresponding function. Please refer to Figure 5 , Figure 5 is a schematic diagram of the analog signal processing circuit, which adopts a chip ADS1242 to complete the corresponding function.

[0025] Please refer to Figure 6 and Figure 7 , Figure 6 and Figure 7 are schematic diagrams of the MCU control circuit.

[0026] An optical fiber link automatic detection method based on the optical fiber link automatic detection device, comprising the following steps: S1, calibrating the optical fiber link automatic detection device with a standard light source to obtain a calibration result; Specifically comprising: Using a standard optical power meter and a standard light source, calibrating the power of each wavelength optical signal output by the multi-light source generating device; Receiving the standard optical signal through the optical power monitoring device and recording the original AD value of each channel; A light power-AD value correspondence table is established and stored in the MCU control circuit to complete calibration.

[0027] S2, analyze the combined measurement uncertainty of the calibration result; Specifically, it includes: Based on multiple calibration data, the measurement repeatability, linear error, temperature drift and other uncertainty components of each wavelength point are calculated; Synthesize each component to get the total measurement uncertainty, and set the confidence interval threshold of the light power measurement.

[0028] S3, based on the uncertainty, introduce a temperature compensation mechanism, and use a temperature compensation algorithm to compensate the measurement result.

[0029] Specifically, it includes: Real-time monitoring of ambient temperature and light emitting device temperature through a temperature sensor; According to the preset temperature-light power drift model (such as a polynomial fitting model), the measured light power value is compensated in real time; The temperature-light power model is established by multi-temperature point testing during the calibration stage and stored in the MCU; Finally, the light power measurement result compensated by temperature and uncertainty is output, improving the measurement accuracy.

[0030] It should be noted that the present application further realizes the functions of signal acquisition, processing, display and storage through software development. This part of the function is not the core content of the present application, and will not be repeated here.

[0031] The beneficial effects of the present application are: it has the functions of optical fiber fault screening and optical fiber fault troubleshooting, can judge the optical fiber fault or optical attenuation problem with the system set verification program, can support the measurement data report generation function after the device measurement is completed, can support the template import, label template import and export functions, and can automatically fill in the test data according to the template imported by the user, meeting the needs of on-site rapid testing and rapid report generation.

[0032] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An automatic fiber optic link detection device, characterized in that: include: Multi-source light source generating equipment and optical power monitoring equipment; The multi-source light source generating device includes: an automatic temperature control circuit and an automatic optical power control circuit, used to control the temperature and power of the light source; The optical power monitoring device is electrically connected to the multi-source light-generating device and is used to monitor the optical signals sent by the multi-source light-generating device and decode them to determine the correspondence between the optical fibers at both ends of the optical cable.

2. The automatic fiber optic link detection device as described in claim 1, characterized in that: The automatic temperature control circuit transmits temperature change information to the MCU control circuit through a temperature sensor. The MCU control circuit then controls the current of the cooler to change its cooling capacity, thereby maintaining a constant temperature around the light-emitting device.

3. The automatic fiber optic link detection device as described in claim 2, characterized in that: The automatic temperature control circuit includes: resistors R1-R5, operational amplifier U2-A, transistor Q3, and temperature sensor; One end of resistors R2 and R4 is connected to power supply terminal V1. The other end of resistor R4 is electrically connected to the non-inverting input of operational amplifier U2-A and one end of resistor R5. The other end of resistor R2 is electrically connected to the inverting input of operational amplifier U2-A, one end of resistor R3, and one end of resistor R1. The other end of resistor R1 is electrically connected to the output terminal of operational amplifier U2-A and the base of transistor Q3. The collector of transistor Q3 is connected to power supply terminal V2. The emitter of transistor Q3 is electrically connected to one end of the cooler. The other end of resistor R5 is grounded, and the other ends of resistor R3 and the cooler are grounded.

4. The automatic fiber optic link detection device as described in claim 1, characterized in that: The automatic optical power control circuit monitors the backlight of the light-emitting device, determines the output optical power of the light-emitting device by the backlight power, and feeds it back to the output of the drive circuit to control the transmitted optical power.

5. The automatic fiber optic link detection device as described in claim 4, characterized in that: The automatic optical power control circuit includes: light-emitting devices D1-D2, transistors Q1, Q2, Q4, resistors R6-R9, capacitors C1-C2, and operational amplifiers U1-A, U3-A, and U4-A; The base of transistor Q1 is connected to the power supply terminal +V1, the collector is connected to GND, and the emitter is connected to one end of resistor R6 and the emitter of transistor Q2. The base of transistor Q2 is electrically connected to the power supply terminal +V2, the collector is connected to the collector of transistor Q4, and the positive terminal of light-emitting device D1 is electrically connected. The negative terminal of light-emitting device D1 is connected to GND, and the other end of resistor R6 is connected to -V2. The positive terminal of LED D2 is electrically connected to one end of capacitor C1, one end of resistor R7, and the inverting terminal of operational amplifier U1-A; the negative terminal of LED D2 is electrically connected to the other end of capacitor C1 and the non-inverting terminal of operational amplifier U1-A; the other end of resistor R7 is connected to the output terminal of operational amplifier U1-A; the output terminal of operational amplifier U1-A is electrically connected to one end of capacitor C2 and the inverting terminal of operational amplifier U4-A; the non-inverting terminal of operational amplifier U4-A is electrically connected to one end of resistor R8 and the output terminal of operational amplifier U3-A; the output terminal of operational amplifier U4-A is electrically connected to the base of transistor Q4; the emitter of transistor Q4 is electrically connected to one end of resistor R9; the other end of resistor R9 is connected to -V1; the other end of resistor R8 is electrically connected to the inverting terminal of operational amplifier U4, and both are connected to VIN; the non-inverting terminal of operational amplifier U3-A is connected to a +5V power supply.

6. The automatic fiber optic link detection device as described in claim 1, characterized in that: The optical power monitoring device includes: a photoelectric conversion circuit, an analog signal processing circuit, and an MCU control circuit.

7. The automatic fiber optic link detection device as described in claim 6, characterized in that: The photoelectric conversion circuit demodulates and converts the optical signal generated by the multi-source light source device into an electrical signal; The analog signal processing circuit amplifies the electrical signal and then samples it; the MCU control circuit calculates and decodes the data in the optical signal for monitoring.

8. The automatic fiber optic link detection device as described in claim 7, characterized in that: The photoelectric conversion circuit and the analog signal processing circuit respectively use photoelectric conversion chips and analog-to-digital conversion chips to perform their respective functions.

9. An automatic fiber optic link detection method, implemented based on the automatic fiber optic link detection device as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. The automatic fiber optic link detection device is calibrated using a standard light source to obtain the calibration results; S2. Analyze the combined measurement uncertainty of the calibration results; S3. Based on the uncertainty, a temperature compensation mechanism is introduced, and a temperature compensation algorithm is used to compensate the measurement results.

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