System and method for measuring optical path consistency of data signal wavelength conversion module

Abstract

The invention relates to the technical field of optical fiber communication, in particular to an optical path consistency measuring system and method for a data signal wavelength conversion module, and the method comprises the steps: measuring the delay value of a measured channel through setting the test frequency of an FPGA module, the wavelength parameter of an adjustable wavelength optical module, the parameter of a 1: 2 optical splitter, and the parameters of a 1: 4 optical switch I and a 1: 4 optical switch II; the method is suitable for measuring the optical path consistency of the data signal OEO wavelength conversion module, the delay measurement range is 70ps-40ns, the measurement precision error is less than or equal to 5%, the control of the optical path delay consistency is ensured, the setting is simple, and the maintainability is good. Therefore, the problem that an existing measurement method cannot meet the optical path delay consistency of optical wavelength conversion is solved.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication technology, and in particular to a system and method for measuring the optical path consistency of a data signal wavelength conversion module. Background Art

[0002] In some distributed multi-communication node data optical transmission systems such as antenna arrays, users consider maintenance and standardization. The optical transmission of multiple data signals in the front and back end devices of the antenna array are designed to be the same optical wavelength. Due to the limitation of the number of optical fiber channels between the antenna array and the lower transmission link (such as smooth ring, etc.), it is necessary to add wavelength conversion and wavelength division multiplexing equipment between the user's sending and receiving devices to multiplex the user's multiple optical signals of the same wavelength into the same optical fiber for transmission. At the same time, it is necessary to maintain the consistency of channel transmission delay required by the user's antenna array. The wavelength conversion equipment has circuits, wavelength division multiplexers and interconnected optical fibers. Due to process reasons, the parameters produced by processing cannot be exactly the same.

[0003] At present, the instruments for testing the delay of data optical transmission systems mainly include data analyzers, etc., which are mostly for standard transmission equipment, while instruments such as optical vector test equipment are for passive optical links or links that only pass through optical amplifiers. The above equipment is not applicable to multi-channel wavelength division multiplexing equipment of OEO. It is necessary to design a data signal light wavelength conversion optical path consistency measurement system and method. Summary of the invention

[0004] The object of the present invention is to provide a data signal wavelength conversion module optical path consistency measurement system and method, aiming to solve the problem that the existing measurement method cannot meet the optical wavelength conversion optical path delay consistency.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a data signal wavelength conversion module optical path consistency measurement system, comprising a high-stability crystal oscillator module, an FPGA module, a clock fan-out module, an adjustable wavelength optical module, a 1:2 optical splitter, a 1:4 optical switch 1, a 1:4 optical switch 2, a 4-channel optical interface 1, a 4-channel optical interface 2, an optical receiving module, a delay measurement module, a 100M Ethernet module and a display module;

[0006] The FPGA module is respectively connected to a high-stable crystal oscillator module, a clock fan-out module, an adjustable wavelength optical module, a 1:4 optical switch 1 and a 1:4 optical switch 2, an optical receiving module, a delay measurement module, a 100M Ethernet module and a display module; the clock fan-out module is respectively connected to the FPGA module and the adjustable wavelength optical module; the adjustable wavelength optical module is connected to the clock fan-out module and a 1:2 optical splitter; the 1:2 optical splitter is connected to the adjustable wavelength optical module, the 1:4 optical switch 1 and the optical receiving module; the 1:4 optical switch 1 is respectively connected to the 1:2 optical splitter and a 4-channel optical interface 1; the 1:4 optical switch 2 is respectively connected to the optical receiving module and a 4-channel optical interface 2; the optical receiving module is respectively connected to the delay measurement module and the FPGA module and the 1:2 optical splitter; the delay measurement module is respectively connected to the FPGA module and the optical receiving module; the 100M Ethernet module and the display module are connected to the FPGA module.

[0007] The high stability crystal oscillator module has a frequency of 10 MHZ and a temperature stability of ±1×10 -9 / ℃, operating temperature: -20℃~+60℃.

[0008] Among them, the main chip of the FPGA module is XC7K325T-2FFG900, which can output 10MHz / 50MHz / 250MHz / 1000MHz test signals.

[0009] The main chip of the clock fan-out module is ADCLK946, and the maximum operating frequency is 4.8 GHz.

[0010] The adjustable wavelength optical module is a single-mode light with a wavelength range of 1528nm to 1563nm, a channel wavelength that complies with the ITU-T standard, a channel spacing of 50GHz, an output power of 0dBm±0.250dBm, and a rate of 10Mb / s to 2.5Gb / s.

[0011] The 1:2 optical splitter is a tapered splitter with a splitting ratio of 30% and 70%, an insertion loss of 6dB and 0.6dB, an input and output 1 optical fiber length of 20cm±0.1cm, and an output 2 optical fiber length of 80cm±0.1cm.

[0012] The 1:4 optical switch 1 and the 1:4 optical switch 2 are MEMS optical switches with a switching rate of 10 ms, an insertion loss of ≤1 dB, and an input and output optical fiber length of 20 cm±0.1 cm.

[0013] The optical receiving module has a rate of 10Mb / s to 2.5Gb / s, an input saturated optical power ≥-3dBm, a receiving sensitivity ≤-24dBm@10Gb / s, an operating temperature of -40°C to +85°C, and a double receiving electrical signal output delay consistency of ≤10ps when the same optical input is used.

[0014] Among them, the main chips of the delay measurement module are AD8302 (monolithic integrated circuit for RF / IF amplitude and phase measurement) and GD32F450 (MCU), the operating frequency of AD8302 is 10MHz~2.7GHz, the optimal phase measurement range is 25 degrees~155 degrees, the phase error is ≤0.5 degrees, the delay measurement range of the delay measurement module is 70ps~40ns, and the measurement accuracy error is ≤5%.

[0015] In a second aspect, a method for measuring the optical path consistency of a data signal wavelength conversion module is provided, which is used in the optical path consistency measurement system for the data signal wavelength conversion module described in the first aspect, and comprises the following steps:

[0016] Fiber access optical interface;

[0017] Set the wavelength of the tunable wavelength optical module;

[0018] The optical switch connects channel 1;

[0019] Convert clock signal to optical signal;

[0020] Measure the phase difference to calculate the delay;

[0021] Adjust the test signal frequency;

[0022] Multi-channel cycle test;

[0023] Displays the reported test results.

[0024] The present invention discloses a data signal wavelength conversion module optical path consistency measurement system, comprising a high-stability crystal oscillator module, an FPGA module, a clock fan-out module, an adjustable wavelength optical module, a 1:2 optical splitter, a 1:4 optical switch 1, a 1:4 optical switch 2, a 4-channel optical interface 1, a 4-channel optical interface 2, an optical receiving module, a delay measurement module, a 100M Ethernet module and a display module; the FPGA module is respectively connected to the high-stability crystal oscillator module, the clock fan-out module, the adjustable wavelength optical module, the 1:4 optical switch 1 and the 1:4 optical switch 2, the optical receiving module, the delay measurement module, the 100M Ethernet module and the display module; the clock fan-out module is respectively connected to the FPGA module The GA module is connected to the adjustable wavelength optical module; the adjustable wavelength optical module is connected to the clock fan-out module and the 1:2 optical splitter; the 1:2 optical splitter is connected to the adjustable wavelength optical module, the 1:4 optical switch 1, and the optical receiving module; the 1:4 optical switch 1 is respectively connected to the 1:2 optical splitter and the 4-channel optical interface 1; the 1:4 optical switch 2 is respectively connected to the optical receiving module and the 4-channel optical interface 2; the optical receiving module is respectively connected to the delay measurement module and the FPGA module and the 1:2 optical splitter; the delay measurement module is respectively connected to the FPGA module and the optical receiving module; the 100M Ethernet module and the display module are connected to the FPGA module. The present invention sets the FPGA module test frequency, the wavelength parameters of the adjustable wavelength optical mode, the 1:2 optical splitter parameters, the 1:4 optical switch one and the 1:4 optical switch two parameters, measures the delay value of the measured channel, and then automatically adjusts to a suitable measurement frequency for accurate measurement according to the measured value. The present invention is suitable for the optical path consistency measurement of the data signal OEO wavelength conversion module, the delay measurement range is 70ps to 40ns, the measurement accuracy error is ≤5%, and the control of the optical path delay consistency is guaranteed. The setting is simple and the maintainability is good. Thus, the problem that the existing measurement method cannot meet the optical wavelength conversion optical path delay consistency is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The present invention provides a data signal wavelength conversion module optical path consistency measurement system and method.

[0027] Figure 2 The present invention provides a flow chart of a method for measuring the optical path consistency of a data signal wavelength conversion module.

[0028] 1-high stability crystal oscillator module, 2-FPGA module, 3-clock fan-out module, 4-adjustable wavelength optical module, 5-1:2 optical splitter, 6-1:4 optical switch 1, 7-1:4 optical switch 2, 8-4 channel optical interface 1, 9-4 channel optical interface 2, 10-optical receiving module, 11-delay measurement module, 12-100M Ethernet module, 13-display module. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] See also Figure 1 In a first aspect, the present invention provides a data signal wavelength conversion module optical path consistency measurement system, including a high-stability crystal oscillator module 1, an FPGA module 2, a clock fan-out module 3, an adjustable wavelength optical module 4, a 1:2 optical splitter 5, a 1:4 optical switch 1 6, a 1:4 optical switch 2 7, a 4-channel optical interface 1 8, a 4-channel optical interface 2 9, an optical receiving module 10, a delay measurement module 11, a 100M Ethernet module 12 and a display module 13;

[0031] The FPGA module 2 is respectively connected to the high-stability crystal oscillator module 1, the clock fan-out module 3, the adjustable wavelength optical module 4, the 1:4 optical switch 1 6 and the 1:4 optical switch 2 7, the optical receiving module 10, the delay measurement module 11, the 100M Ethernet module 12 and the display module 13; the clock fan-out module 3 is respectively connected to the FPGA module 2 and the adjustable wavelength optical module 4; the adjustable wavelength optical module 4 is connected to the clock fan-out module 3 and the 1:2 optical splitter 5; the 1:2 optical splitter 5 is connected to the adjustable wavelength optical module 4 and the 1:4 optical switch The switch 16 is connected to the optical receiving module 10; the 1:4 optical switch 16 is respectively connected to the 1:2 optical splitter 5 and the 4-channel optical interface 18; the 1:4 optical switch 27 is respectively connected to the optical receiving module 10 and the 4-channel optical interface 29; the optical receiving module 10 is respectively connected to the delay measurement module 11 and the FPGA module 2 and the 1:2 optical splitter 5; the delay measurement module 11 is respectively connected to the FPGA module 2 and the optical receiving module 10; the 100M Ethernet module 12 and the display module 13 are connected to the FPGA module 2.

[0032] The high-stability crystal oscillator module 1 has a frequency of 10 MHZ and a temperature stability of ±1×10 -9 / ℃, operating temperature: -20℃~+60℃.

[0033] The main chip of the FPGA module 2 is XC7K325T-2FFG900, which can output 10MHz / 50MHz / 250MHz / 1000MHz test signals.

[0034] The main chip of the clock fan-out module 3 is ADCLK946, and the maximum operating frequency is 4.8 GHz.

[0035] The adjustable wavelength optical module 4 is single-mode light with a wavelength range of 1528nm to 1563nm, a channel wavelength that complies with the ITU-T standard, a channel spacing of 50GHz, an output power of 0dBm±0.250dBm, and a rate of 10Mb / s to 2.5Gb / s.

[0036] The 1:2 optical splitter 5 is a tapered splitter with a splitting ratio of 30% and 70%, an insertion loss of 6dB and 0.6dB, an input and output 1 optical fiber length of 20cm±0.1cm, and an output 2 optical fiber length of 80cm±0.1cm.

[0037] The 1:4 optical switch 1 6 and the 1:4 optical switch 2 7 are MEMS optical switches with a switching rate of 10 ms, an insertion loss of ≤1 dB, and an input and output optical fiber length of 20 cm±0.1 cm.

[0038] The optical receiving module 10 is a dual-receiving optical module with a rate of 10Mb / s to 2.5Gb / s, an input saturated optical power ≥-3dBm, a receiving sensitivity ≤-24dBm@10Gb / s, an operating temperature of -40°C to +85°C, and a dual-receiving electrical signal output delay consistency of ≤10ps when the same optical input is used.

[0039] The main chips of the delay measurement module 11 are AD8302 (monolithic integrated circuit for RF / IF amplitude and phase measurement) and GD32F450 (MCU). The operating frequency of AD8302 is 10MHz~2.7GHz, the optimal phase measurement range is 25 degrees~155 degrees, and the phase error is ≤0.5 degrees. The delay measurement range of the delay measurement module 11 is 70ps~40ns, and the measurement accuracy error is ≤5%.

[0040] In this embodiment, the present invention sets the test frequency of the FPGA module 2, the wavelength parameters of the adjustable wavelength optical mode, the parameters of the 1:2 optical splitter 5, the parameters of the 1:4 optical switch 1 6 and the 1:4 optical switch 2 7, measures the delay value of the measured channel, and then automatically adjusts to a suitable measurement frequency for accurate measurement according to the measured value, which is suitable for the optical path consistency measurement of the data signal OEO wavelength conversion module, the delay measurement range is 70ps to 40ns, the measurement accuracy error is ≤5%, and the control of the optical path delay consistency is guaranteed, the setting is simple, and the maintainability is good. Thus, the problem that the existing measurement method cannot meet the optical wavelength conversion optical path delay consistency is solved.

[0041] See also Figure 2 In a second aspect, a method for measuring the optical path consistency of a data signal wavelength conversion module is provided, which is used in the optical path consistency measurement system of the data signal wavelength conversion module described in the first aspect, and comprises the following steps:

[0042] S1 fiber access optical interface;

[0043] Specifically, the optical fiber at the input end of the OEO wavelength conversion module of the tested user's data signal is connected to the 4-channel optical interface 1 8 in the required order, and the optical fiber at the output end is connected to the 4-channel optical interface 2 9 in the required order.

[0044] S2 sets the wavelength of the tunable wavelength optical module 4;

[0045] Specifically, the host computer sets the FPGA module 2 to output a control level to control the wavelength of the adjustable wavelength optical module 4 to be the working wavelength of the wavelength conversion module according to the working wavelength of the wavelength conversion module of the user data signal.

[0046] The S3 optical switch connects channel 1;

[0047] Specifically, the FPGA module 2 outputs a control signal to control the 4:1 optical switch to connect the first channel.

[0048] S4 clock signal converted to optical signal;

[0049] Specifically, the FPGA module 2 sends a 10MHz high-stability, low-jitter square wave to the clock fan-out module 3; the clock fan-out module 3 outputs to the adjustable wavelength optical module 4, the adjustable wavelength optical module 4 converts the input 10MHz signal into an optical signal, and divides it into two outputs through the 1:2 optical splitter 5, the optical fiber 1 output is output to the user data signal wavelength conversion module through the 4:1 optical switch 1, the data signal wavelength conversion module output is input to the 4:1 optical switch 2, and after the switch, it is connected to the channel 2 of the optical receiving module 10, and the optical fiber 2 of the 1:2 optical splitter 5 is connected to the channel 1 of the optical receiving module 10; the optical receiving module 10 converts the two input optical signals into electrical signals and then inputs them into the delay measurement module 11 to measure the phase difference between the two.

[0050] S5 measures the phase difference and calculates the delay;

[0051] Specifically, the delay measurement module 11 measures the phase difference of the input 2 10MHz and outputs an analog voltage signal, which is converted into a data signal by the ADC circuit of the GD32F450 (MCU), and calculates the phase difference value, and determines whether the phase difference falls within the range of 25 degrees to 155 degrees with a smaller measurement error. For example, according to the test frequency 10MHz period 100ns issued by the FPGA module 2, the delay value is calculated. Example 1, if the measured phase difference is 30 degrees, the delay value = 30 degrees * 100ns / 360 degrees = 8.33ns, and the accuracy error is 0.5 degrees, which is approximately equal to 0.14ns. Example 2, if the measured phase difference is 150 degrees, the delay value = 150 degrees * 100ns / 360 degrees = 41.7ns, and the accuracy error is also 0.5 degrees, which is approximately equal to 0.14ns. For example 3, if the measured phase difference is 5 degrees, the delay value = 5 degrees * 100ns / 360 degrees = 1.39ns, and the accuracy error is also 6 degrees, which is approximately equal to 1.67ns.

[0052] S6 adjusts the test signal frequency;

[0053] Specifically, if S5 measures a phase difference within the range of 25 to 155 degrees, the result is saved, and then step S7 is performed; if the phase difference is ≤25 degrees, the FPGA module 2 sends a 50 MHz test signal for testing; if the phase difference is within the range of 25 to 155 degrees, the result is saved, and then step S7 is performed; if the phase difference is ≤25 degrees, the FPGA module 2 sends a 250 MHz test signal for testing; if the phase difference is within the range of 25 to 155 degrees, the result is saved, and then step S7 is performed; if the phase difference is ≤25 degrees, the FPGA module 2 sends a 1000 MHz test signal for testing; if the phase difference is within the range of 25 to 155 degrees, the result is saved; if it is not within this range, it is judged as out of range and displayed, and then step S7 is performed.

[0054] S7 multi-channel cycle test;

[0055] Specifically, the FPGA module 2 outputs a switching command to the 4:1 optical switch 1 6 and the 4:1 optical switch 2 7, switches to the next channel, and then tests the channel according to steps S4 to S6. After the test, it switches to the next channel until all channel tests are completed.

[0056] S8 displays the reported test results.

[0057] Specifically, the difference between the delay value of each channel and the set required value is calculated and displayed, the average value of all channels is calculated and displayed, and the maximum and minimum values ​​of all channels are calculated and displayed; and reported through the 100M network.

[0058] The delay measurement range of each measurement frequency is: the delay measurement range of 10MHz measurement frequency is 6.95ns~43ns, the delay measurement range of 50MHz measurement frequency is 1.39ns~8.61ns, the delay measurement range of 250MHz measurement frequency is 280ps~1.73ns, and the delay measurement range of 1000MHz measurement frequency is 69ps~430ps.

[0059] What is disclosed above is only a preferred embodiment of a data signal wavelength conversion module optical path consistency measurement system and method of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. A data signal wavelength conversion module optical path consistency measurement system, characterized in that :include Including high-stable crystal oscillator module, FPGA module, clock fan-out module, adjustable wavelength optical module, 1:2 optical splitter, 1:4 optical switch 1, 1:4 optical switch 2, 4-channel optical interface 1, 4-channel optical interface 2, optical receiving module, delay measurement module, 100M Ethernet module and display module; The FPGA module is respectively connected to a high-stable crystal oscillator module, a clock fan-out module, an adjustable wavelength optical module, a 1:4 optical switch 1 and a 1:4 optical switch 2, an optical receiving module, a delay measurement module, a 100M Ethernet module and a display module; the clock fan-out module is respectively connected to the FPGA module and the adjustable wavelength optical module; the adjustable wavelength optical module is connected to the clock fan-out module and a 1:2 optical splitter; the 1:2 optical splitter is connected to the adjustable wavelength optical module, the 1:4 optical switch 1 and the optical receiving module; the 1:4 optical switch 1 is respectively connected to the 1:2 optical splitter and a 4-channel optical interface 1; the 1:4 optical switch 2 is respectively connected to the optical receiving module and a 4-channel optical interface 2; the optical receiving module is respectively connected to the delay measurement module and the FPGA module and the 1:2 optical splitter; the delay measurement module is respectively connected to the FPGA module and the optical receiving module; the 100M Ethernet module and the display module are connected to the FPGA module.

2. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The high-stability crystal oscillator module has a frequency of 10MHZ and a temperature stability of ±1×10 -9 / ℃, operating temperature: -20℃~+60℃.

3. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The main chip of the FPGA module is XC7K325T-2FFG900, which can output 10MHz / 50MHz / 250MHz / 1000MHz test signals.

4. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The main chip of the clock fan-out module is ADCLK946, and the maximum operating frequency is 4.8 GHz.

5. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The adjustable wavelength optical module is single-mode light with a wavelength range of 1528nm to 1563nm, a channel wavelength that complies with the ITU-T standard, a channel spacing of 50GHz, an output power of 0dBm±0.250dBm, and a rate of 10Mb / s to 2.5Gb / s.

6. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The 1:2 optical splitter is a tapered splitter with a splitting ratio of 30% and 70%, an insertion loss of 6dB and 0.6dB, an input and output 1 optical fiber length of 20cm±0.1cm, and an output 2 optical fiber length of 80cm±0.1cm.

7. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The 1:4 optical switch 1 and the 1:4 optical switch 2 are MEMS optical switches with a switching rate of 10 ms, an insertion loss of ≤1 dB, and an input and output optical fiber length of 20 cm±0.1 cm.

8. The optical path consistency measurement system of a data signal wavelength conversion module according to claim 1, characterized in that : The optical receiving module has a rate of 10Mb / s to 2.5Gb / s, an input saturated optical power ≥-3dBm, a receiving sensitivity ≤-24dBm@10Gb / s, an operating temperature of -40°C to +85°C, and a double receiving electrical signal output delay consistency of ≤10ps when the same optical input is used.

9. A data signal wavelength conversion module optical path consistency measurement system as claimed in claim 1, characterized in that : The main chips of the delay measurement module are AD8302 (monolithic integrated circuit for RF / IF amplitude and phase measurement) and GD32F450 (MCU). The operating frequency of AD8302 is 10MHz to 2.7GHz, the optimal phase measurement range is 25 degrees to 155 degrees, the phase error is ≤0.5 degrees, the delay measurement range of the delay measurement module is 70ps to 40ns, and the measurement accuracy error is ≤5%.

10. A method for measuring the optical path consistency of a data signal wavelength conversion module, used in the optical path consistency measurement system of a data signal wavelength conversion module according to any one of claims 1 to 9, characterized in that : Includes the following steps: Fiber access optical interface; Set the wavelength of the tunable wavelength optical module; The optical switch connects channel 1; Convert clock signal to optical signal; Measure the phase difference to calculate the delay; Adjust the test signal frequency; Multi-channel cycle test; Displays the reported test results.

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