Information measurement method, device and equipment

Abstract

The present invention provides an information measurement method, apparatus, and device, wherein the information measurement device includes: a light source, an intensity modulator, a mode converter, and a mode orientation polarization perturbator connected in sequence; a light detector connectable to the output end of the few-mode fiber to be measured; a computing unit connected to the light detector via a signal collector; the mode orientation polarization perturbator connectable to the input end of the few-mode fiber to be measured; the intensity modulator is also connected to a sine wave generator; the intensity modulator modulates the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode orientation polarization perturbator continuously perturbs the spatial orientation and polarization state combination of the degenerate modes traversing the optical signal; and the computing unit determines the signal broadening factor information of the few-mode fiber to be measured based on the signal collected by the signal collector. This solution solves the existing problem of being unable to accurately and simultaneously measure the differential mode delay and chromatic dispersion of the degenerate mode.

Description

Technical Field

[0001] The present invention relates to the field of information measurement technology, and in particular to an information measurement method, device and equipment. Background Art

[0002] With the continuous increase in network users and the emergence of new network data services, the demand for network capacity is growing. Because common optical multiplexing dimensions (such as time, wavelength, polarization, and multi-level modulation) are facing potential bottlenecks, current optical communication systems based on standard single-mode fiber are unable to meet the booming network capacity demand. However, the modes in few-mode fiber (FMF) have attracted widespread attention as a new optical multiplexing dimension. Ideally, the modes are mutually orthogonal and can be used as independent channels. By combining these modes with traditional time, wavelength, polarization, and multi-level modulation formats, the system's transmission capacity can be greatly increased. In the future, FMF will be widely used in key scenarios such as slicing packet networks (SPNs), optical transport networks (OTNs), passive optical networks (PONs), 5G fronthaul, and data center interconnects (DCIs). Therefore, studying and testing the mode-related parameters in FMF is crucial for monitoring system performance.

[0003] Specifically, due to weak guidance, the eigenvector modes supported by few-mode fiber can become degenerate. This means that eigenvector modes with similar effective refractive indices degenerate into a single degenerate mode. In mode-division multiplexing (MDM) fiber transmission systems, degenerate modes are typically used as channel units. This means that the eigenvector modes comprising the same degenerate mode carry the same signal in the fiber.

[0004] However, each eigenvector mode within the same degenerate mode still has slight differences in effective refractive index and propagation velocity, which accumulates delay during transmission. This in turn causes signal broadening and intersymbol interference (ISI), resulting in signal quality degradation and impacting network transmission performance. This phenomenon is called intra-degenerate-mode differential mode delay (IDM-DMD). IDM-DMD is a critical parameter affecting system performance and stability.

[0005] Furthermore, like the fundamental mode in conventional single-mode fiber, the degenerate modes in few-mode fiber also experience chromatic dispersion (CD) due to the material dispersion and waveguide dispersion of the fiber waveguide. This also accumulates delay during transmission, causing signal broadening. Therefore, the impairments caused by differential mode delay and chromatic dispersion within the degenerate modes are of the same type. Accurately measuring these two mode characteristic parameters simultaneously is crucial for evaluating the performance of mode-division transmission systems.

[0006] However, there is no solution in the prior art for simultaneously measuring the intra-degenerate mode differential mode delay and the degenerate mode chromatic dispersion, and it is impossible to accurately measure the intra-degenerate mode differential mode delay and the degenerate mode chromatic dispersion simultaneously. Summary of the Invention

[0007] The object of the present invention is to provide an information measurement method, apparatus and device to solve the problem in the prior art that it is impossible to accurately and simultaneously measure the differential mode delay and degenerate mode chromatic dispersion within the degenerate mode.

[0008] In order to solve the above technical problems, an embodiment of the present invention provides an information measuring device, including:

[0009] A light source, an intensity modulator, a mode converter, and a mode orientation polarization perturbator connected in sequence;

[0010] and, a light detector capable of being connected to the output end of the few-mode optical fiber to be measured;

[0011] and, a computing unit connected to the light detector via a signal collector;

[0012] The mode orientation polarization perturbator can be connected to the input end of the few-mode optical fiber to be tested; the intensity modulator is also connected to a sine wave generator; the intensity modulator modulates the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode orientation polarization perturbator continuously perturbs the spatial orientation and polarization state combination of the degenerate mode traversing the optical signal;

[0013] The calculation unit can determine the signal broadening factor information of the few-mode optical fiber to be tested according to the signal collected by the signal collector; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode.

[0014] An embodiment of the present invention further provides an information measurement method, which is applied to the above-mentioned information measurement device, and the method includes:

[0015] The intensity modulator is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal;

[0016] Using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator;

[0017] Utilizing the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sending the perturbed optical signal to the few-mode optical fiber to be tested;

[0018] Using a light detector, the optical signal passing through the few-mode optical fiber to be tested is converted into an electrical signal, and the electrical signal is transmitted to a signal collector;

[0019] The signal collector is used to convert the electrical signal into a digital signal, and transmit the digital signal to the computing unit;

[0020] The calculation unit is used to obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

[0021] Optionally, the degenerate mode intra-differential mode delay information includes: at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0022] Optionally, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min ;

[0023] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0024] Utilize the calculation unit, according to the maximum optical power P max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0025] Wherein, the formula 1 is:

[0026] The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0027] Optionally, obtaining, by the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal further includes:

[0028] Using the calculation unit, according to the intra-degenerate mode differential mode delay value, using Formula 2, obtain the intra-degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0029] Wherein, the formula 2 is:

[0030] The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0031] Optionally, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the calculation unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length max ;

[0032] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0033] Utilize the calculation unit, according to the digital signal size P0 and the maximum optical power P max , using Formula 3, obtaining the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0034] Wherein, the formula three is:

[0035] The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0036] An embodiment of the present invention further provides an information measurement device, which is applied to the above-mentioned information measurement device, and the device includes:

[0037] The first modulation module is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source using an intensity modulator to form a modulated optical signal;

[0038] A conversion and transmission module is used to convert the fundamental mode in the few-mode optical fiber to be tested into the degenerate mode to be tested by using a mode converter, and send the optical signal to the mode orientation polarization perturbator;

[0039] a disturbance sending module, configured to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal using the mode orientation polarization perturbator, and send the perturbed optical signal to the few-mode optical fiber to be tested;

[0040] A first conversion and transmission module is used to convert the optical signal passing through the few-mode optical fiber to be tested into an electrical signal using a light detector, and transmit the electrical signal to a signal collector;

[0041] a second conversion and transmission module, configured to convert the electrical signal into a digital signal using the signal collector, and transmit the digital signal to the computing unit;

[0042] The first processing module is configured to obtain, using the calculation unit and based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode.

[0043] Optionally, the degenerate mode intra-differential mode delay information includes: at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0044] Optionally, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min ;

[0045] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0046] Utilize the calculation unit, according to the maximum optical power P max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0047] Wherein, the formula 1 is:

[0048] The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0049] Optionally, obtaining, by the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal further includes:

[0050] Using the calculation unit, according to the intra-degenerate mode differential mode delay value, using Formula 2, obtain the intra-degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0051] Wherein, the formula 2 is:

[0052] The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0053] Optionally, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the calculation unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length max ;

[0054] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0055] Utilize the calculation unit, according to the digital signal size P0 and the maximum optical power P max , using Formula 3, obtaining the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0056] Wherein, the formula three is:

[0057] The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0058] An embodiment of the present invention further provides an information measuring device, comprising the components included in the above-mentioned information measuring device, the device further comprising: a processor and a transceiver;

[0059] The processor is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source using an intensity modulator to form a modulated optical signal;

[0060] Using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator;

[0061] Utilizing the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sending the perturbed optical signal to the few-mode optical fiber to be tested;

[0062] Using a light detector, the optical signal passing through the few-mode optical fiber to be tested is converted into an electrical signal, and the electrical signal is transmitted to a signal collector;

[0063] The signal collector is used to convert the electrical signal into a digital signal, and transmit the digital signal to the computing unit;

[0064] The calculation unit is used to obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

[0065] Optionally, the degenerate mode intra-differential mode delay information includes: at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0066] Optionally, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min ;

[0067] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0068] Utilize the calculation unit, according to the maximum optical power P max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0069] Wherein, the formula 1 is:

[0070] The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0071] Optionally, obtaining, by the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal further includes:

[0072] Using the calculation unit, according to the intra-degenerate mode differential mode delay value, using Formula 2, obtain the intra-degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0073] Wherein, the formula 2 is:

[0074] The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0075] Optionally, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the calculation unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length max ;

[0076] The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes:

[0077] Utilize the calculation unit, according to the digital signal size P0 and the maximum optical power P max , using Formula 3, obtaining the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested;

[0078] Wherein, the formula three is:

[0079] The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0080] An embodiment of the present invention further provides an information measurement device, comprising a memory, a processor, and a program stored in the memory and executable on the processor; the processor implements the above-mentioned information measurement method when executing the program.

[0081] An embodiment of the present invention further provides a readable storage medium on which a program is stored. When the program is executed by a processor, the steps in the above-mentioned information measurement method are implemented.

[0082] The beneficial effects of the above technical solution of the present invention are as follows:

[0083] In the above scheme, the information measuring device is provided with a light source, an intensity modulator, a mode converter and a mode orientation polarization perturbator connected in sequence; and a light detector that can be connected to the output end of the few-mode optical fiber to be measured; and a computing unit connected to the light detector through a signal collector; wherein the mode orientation polarization perturbator can be connected to the input end of the few-mode optical fiber to be measured; the intensity modulator is also connected to a sine wave generator; the intensity modulator modulates the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode orientation polarization perturbator continuously perturbs the spatial orientation and polarization state combination of the degenerate mode of the optical signal; the computing unit The unit can determine the signal broadening factor information of the few-mode optical fiber to be tested based on the signal collected by the signal collector; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information; it can realize simple, fast and accurate joint measurement of two mode characteristic parameters: differential mode delay within the degenerate mode and degenerate mode chromatic dispersion; in addition, this solution can reduce the number of times the few-mode optical fiber is disassembled and assembled, and debugging is simple. The differential mode delay within the measured degenerate mode, its coefficient and degenerate mode chromatic dispersion can be obtained through one debugging, which greatly reduces the workload and has a high degree of automation; it effectively solves the problem in the existing technology that it is impossible to accurately and simultaneously measure the differential mode delay within the degenerate mode and the degenerate mode chromatic dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1 Schematic diagram of the structure of the information measurement device according to an embodiment of the present invention Figure 1 ;

[0085] Figure 2 This is a flow chart of an information measurement method according to an embodiment of the present invention;

[0086] Figure 3 The specific implementation structure of the information measurement device of the embodiment of the present invention is shown as follows Figure 1 ;

[0087] Figure 4 The specific implementation structure of the information measurement device of the embodiment of the present invention is shown as follows Figure 2 ;

[0088] Figure 5 This is a schematic structural diagram of an information measurement device according to an embodiment of the present invention;

[0089] Figure 6 Schematic diagram of the structure of the information measurement device according to an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0090] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0091] The present invention aims to solve the problem that the existing technology cannot accurately measure the differential mode delay and degenerate mode chromatic dispersion in the degenerate mode at the same time, and provides an information measurement device, such as Figure 1 Shown, including:

[0092] A light source 1, an intensity modulator 2, a mode converter 3 and a mode orientation polarization perturbator 4 connected in sequence;

[0093] and, a light detector 6 capable of being connected to the output end of the few-mode optical fiber 5 to be tested;

[0094] and a computing unit 8 connected to the light detector 6 via a signal collector 7;

[0095] The mode orientation polarization perturbator 4 can be connected to the input end of the few-mode optical fiber 8 to be tested; the intensity modulator 2 is also connected to the sine wave generator 9; the intensity modulator 2 modulates the sinusoidal radio frequency signal generated by the sine wave generator 9 onto the linearly polarized laser emitted by the light source 1 to form a modulated optical signal; the mode orientation polarization perturbator 4 continuously perturbs the spatial orientation and polarization state combination of the degenerate mode traversing the optical signal;

[0096] The calculation unit 8 can determine the signal broadening factor information of the few-mode optical fiber 8 to be tested based on the signal collected by the signal collector 7; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode.

[0097] The few-mode optical fiber to be tested may also be referred to as the tested few-mode optical fiber, which is not limited here.

[0098] The information measuring device provided by the embodiment of the present invention is provided with a light source, an intensity modulator, a mode converter and a mode orientation polarization perturbator connected in sequence; and a light detector that can be connected to the output end of the few-mode optical fiber to be measured; and a computing unit connected to the light detector through a signal collector; wherein the mode orientation polarization perturbator can be connected to the input end of the few-mode optical fiber to be measured; the intensity modulator is also connected to a sine wave generator; the intensity modulator modulates the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode orientation polarization perturbator continuously perturbs the spatial orientation and polarization state combination of the degenerate mode of the optical signal; the computing unit The calculation unit can determine the signal broadening factor information of the measured few-mode optical fiber based on the signal collected by the signal collector; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information; it can realize simple, fast and accurate joint measurement of two mode characteristic parameters: differential mode delay within the degenerate mode and degenerate mode chromatic dispersion; in addition, this solution can reduce the number of times the few-mode optical fiber is disassembled and assembled, and the debugging is simple. The differential mode delay within the measured degenerate mode, its coefficient and degenerate mode chromatic dispersion can be obtained in one debugging, which greatly reduces the workload and has a high degree of automation; it well solves the problem in the prior art that the differential mode delay within the degenerate mode and the degenerate mode chromatic dispersion cannot be accurately measured simultaneously.

[0099] The embodiment of the present invention also provides an information measurement method, which is applied to the above-mentioned information measurement device, such as Figure 2 As shown, the method includes:

[0100] Step 21: Using an intensity modulator, the sine wave radio frequency signal generated by the sine wave generator is modulated onto the linearly polarized laser light emitted by the light source to form a modulated optical signal;

[0101] Step 22: using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator;

[0102] Step 23: continuously perturbing the spatial orientation and polarization state combination of the degenerate modes of the optical signal by using the mode orientation polarization perturbator, and sending the perturbed optical signal to the few-mode optical fiber to be tested;

[0103] Step 24: using a light detector to convert the optical signal passing through the few-mode optical fiber to be tested into an electrical signal, and transmitting the electrical signal to a signal collector;

[0104] Step 25: using the signal collector to convert the electrical signal into a digital signal and transmit it to a computing unit;

[0105] Step 26: Using the calculation unit, obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

[0106] The information measurement method provided by the embodiment of the present invention uses an intensity modulator to modulate the sinusoidal wave radio frequency signal generated by the sinusoidal wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; uses a mode converter to convert the fundamental mode in the few-mode optical fiber to be measured into the degenerate mode to be measured, and sends the optical signal to a mode orientation polarization perturbator; uses the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sends the perturbed optical signal to the few-mode optical fiber to be measured; uses an optical detector to convert the optical signal passing through the few-mode optical fiber to be measured into an electrical signal, and transmits it to a signal collector; uses the signal collector to convert the electrical signal into a digital signal, and transmits it to a computing unit; uses the The calculation unit obtains, based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information. This solution can achieve simple, rapid, and accurate joint measurement of two mode characteristic parameters: differential mode delay within the degenerate mode and degenerate mode chromatic dispersion. In addition, this solution can reduce the number of times the few-mode optical fiber is disassembled and assembled, and debugging is simple. The differential mode delay within the measured degenerate mode, its coefficient, and degenerate mode chromatic dispersion can be obtained in a single debugging, which greatly reduces the workload and has a high degree of automation. This solution effectively solves the problem in the prior art of being unable to accurately and simultaneously measure differential mode delay and degenerate mode chromatic dispersion within the degenerate mode.

[0107] The intra-degenerate mode differential mode delay information includes at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0108] In the embodiment of the present invention, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the maximum optical power P max and the minimum optical power P min , using Formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein, Formula 1 is: The Δτ IDM-DMDrepresents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0109] The first duration may be greater than 30 seconds.

[0110] In an embodiment of the present invention, the step of obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested based on the digital signal further includes: obtaining, using the calculation unit, the differential mode delay value within the degenerate mode, and formula 2 to obtain the differential mode delay coefficient within the degenerate mode of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0111] In an embodiment of the present invention, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the computing unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length. max The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the digital signal size P0 and the maximum optical power P max , using Formula 3, the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested is obtained; wherein, Formula 3 is: The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0112] The first duration may be greater than 30 seconds.

[0113] The following describes an information measurement device and an information measurement method provided in an embodiment of the present invention by way of example. The information measurement device may also be referred to as an information measurement apparatus, and the following description will be based on the information measurement apparatus.

[0114] In response to the above technical problems, embodiments of the present invention provide an information measurement device and method, which can be specifically implemented as a joint measurement device and method for differential mode delay within a degenerate mode and degenerate mode chromatic dispersion in a few-mode optical fiber. The device and method can simply and accurately measure two mode characteristic parameters, differential mode delay within a degenerate mode and degenerate mode chromatic dispersion. The device has the advantages of simplicity, wide dynamic range, fast measurement speed, and accurate measurement. It can solve the current problem of being unable to simultaneously measure differential mode delay within a degenerate mode and degenerate mode chromatic dispersion.

[0115] Specifically, the solution provided by the embodiment of the present invention relates to:

[0116] (1) A joint measurement device for intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion, comprising a light source, an intensity modulator, a sine wave generator, a mode converter, a mode orientation polarization perturbator, a light detector, a signal collector, and a computing unit;

[0117] (2) A method for jointly measuring intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in a few-mode optical fiber using the above-mentioned apparatus for jointly measuring intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion.

[0118] like Figure 3As shown, the degenerate mode intra-differential mode delay and degenerate mode chromatic dispersion joint measurement device: the light source, intensity modulator, mode converter, mode orientation polarization perturbator and light detector are arranged in sequence on the optical path; the sine wave generator is electrically connected to the intensity modulator; the signal collector is electrically connected to the light detector; the calculation unit is connected to the digital signal of the signal collector; the light source is used to generate linearly polarized laser; the sine wave generator is used to generate a sine wave radio frequency signal of a specific frequency; the intensity modulator is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode converter is used to convert the fundamental mode in the single-mode optical fiber into a specific degenerate mode (corresponding to the degenerate mode) in the few-mode optical fiber to be measured. The above-mentioned degenerate mode to be measured), specifically, there are multiple degenerate modes in the few-mode optical fiber, and the role of the mode converter is to excite a specific degenerate mode among them, and this degenerate mode is the mode to be measured; the mode orientation polarization perturbator is used to continuously and rapidly perturb the spatial orientation and polarization state combination of the degenerate mode (that is, to perturb the optical signal so that its degenerate mode spatial orientation and polarization state combination are traversed); the optical detector is used to convert the optical signal into an electrical signal; the signal collector is used to collect the electrical signal as a digital signal; the computing unit is used to obtain the digital signal collected by the signal collector, and calculate the degenerate mode intra-differential mode delay (corresponding to the above-mentioned degenerate mode intra-differential mode delay information) and degenerate mode chromatic dispersion of the degenerate mode to be measured in the few-mode optical fiber to be measured. It is hereby explained that the mode converter used in this solution can purely excite the specific degenerate mode to be measured in the few-mode optical fiber, and can simultaneously realize the measurement of its intra-mode differential mode delay and chromatic dispersion.

[0119] Optionally, the device for jointly measuring intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion has an adjustable light source operating wavelength, spectral width, and laser power, and is used to provide narrow-spectrum continuous laser light. The light source operating wavelength range can be continuously adjustable between 850-1650nm, the laser linewidth is less than 5MHz, and the laser power is continuously adjustable between 0-1W; its intensity modulator can be a lithium niobate modulator, a silicon-based modulator, an indium phosphide modulator, or other types of light intensity modulators; its sine wave generator can be a radio frequency source, an arbitrary waveform generator (AWG), a waveform generator based on a field programmable gate array (FPGA), or a waveform generator based on an application specific integrated circuit (ASIC). The invention relates to a waveform generator of an ASIC (Application Specific Integrated Circuit), wherein the frequency and amplitude of the waveform generator are adjustable; the mode converter thereof can be one or more of an optical fiber mode selective coupler made by a fused taper method, an optical fiber mode selective coupler made by a side polishing method, a mode selective coupler based on a silicate glass substrate made by a 3D laser direct writing method, a planar optical waveguide mode selective coupler, a long period fiber grating mode converter, a mechanical phase plate mode converter, a mode converter based on a spatial light modulator, a multi-plane optical converter, and a photon lantern; the mode orientation polarization perturbator can be a mechanical mode orientation polarization perturbator, a manual mode orientation polarization perturbator, or any other device that can realize high-frequency perturbation traversal of the degenerate mode orientation and polarization state; the optical detector can be an optical detector based on a PIN photodiode or an optical detector based on an avalanche photodiode; the signal collector can be a real-time oscilloscope, a real-time electrical signal collector based on a field programmable gate array (FPGA), or an application specific integrated circuit (ASIC). A real-time electrical signal collector (ASIC) is provided. The computing unit is configured to acquire a time-domain digital signal of the optical signal under test and, based thereon, calculate the degenerate mode intra-differential mode delay, the degenerate mode intra-differential mode delay coefficient, and the degenerate mode chromatic dispersion coefficient. The time-domain digital signal acquired by the computing unit is obtained from a signal collector, which generates the time-domain digital signal of the optical signal under test.

[0120] The method for jointly measuring intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion using the above-mentioned device for jointly measuring intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in a few-mode optical fiber involves the following steps:

[0121] 1) Selecting a measured few-mode fiber of length L (corresponding to the above-mentioned few-mode fiber to be tested), placing it between the mode orientation polarization perturbator and the photodetector of the joint measurement device for intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in the above-mentioned few-mode fiber, adjusting the optical path, and measuring the optical power OP after passing through the mode converter, the mode orientation polarization perturbator, and the measured few-mode fiber;

[0122] 2) placing the joint measurement device for intra-degenerate-mode differential mode delay and degenerate-mode chromatic dispersion in the few-mode optical fiber in a corresponding measurement state (for example, setting the output operating wavelength, output power, and frequency of the sine wave of the light source; turning on a mode orientation polarization perturbator, etc.), and returning the measured intra-degenerate-mode differential mode delay, intra-degenerate-mode differential mode delay coefficient, and degenerate-mode chromatic dispersion coefficient of each degenerate mode in the measured few-mode optical fiber.

[0123] In the method for jointly measuring differential mode delay and chromatic dispersion of degenerate modes in a few-mode optical fiber, the length L of the measured few-mode optical fiber is between 0 and 100 km.

[0124] The above step 2) may specifically include the following steps:

[0125] a) placing a mode converter corresponding to the measured degenerate mode in the working optical path of the joint measurement device for differential mode delay and degenerate mode chromatic dispersion in the degenerate mode in the few-mode optical fiber, adjusting the output working wavelength λ and output power of the light source to a preset working wavelength and preset output power, setting the frequency of the sine wave to f (corresponding to the frequency of the sine wave generated by the above-mentioned sine wave generator), and turning on the mode toward the polarization perturbator; wherein the measured degenerate mode corresponds to the above-mentioned degenerate mode to be measured.

[0126] b) The signal collector collects a time domain electrical signal for a certain time length (corresponding to the first time length mentioned above), which should be greater than 30s, and obtains the degenerate mode intra-differential mode delay and the degenerate mode intra-differential mode delay coefficient of the measured degenerate mode in the measured few-mode optical fiber at the preset working wavelength calculated by the calculation unit; the specific calculation process is as follows: the calculation unit analyzes the collected digital signal and records the maximum value P of the digital signal max (corresponding to the maximum optical power and the minimum optical power P) min (corresponding to the above minimum optical power), at the operating wavelength λ, the differential mode delay Δτ within the measured degenerate mode in the measured few-mode fiber IDM-DMD The calculation formula (corresponding to the above formula 1) is:

[0127]

[0128] Where arccos is the inverse cosine function. The differential mode delay coefficient C in the measured degenerate mode in the measured few-mode fiber IDM-DMDThe calculation formula (corresponding to the above formula 2) is:

[0129]

[0130] c) Obtaining the degenerate mode chromatic dispersion coefficient of the measured few-mode fiber at the preset operating wavelength calculated by the calculation unit. The specific calculation process is as follows: searching a lookup table of digital signal sizes corresponding to optical signals of different powers passing through the optical detector on the calculation unit, determining the digital signal size P0 corresponding to OP. At the operating wavelength λ, the calculation formula for the measured degenerate mode chromatic dispersion coefficient of the measured few-mode fiber (corresponding to the above formula 3) is:

[0131]

[0132] Where c is the speed of light in vacuum. The lookup table may be pre-stored.

[0133] The following is a specific example of this solution.

[0134] The device for jointly measuring differential mode delay and degenerate mode chromatic dispersion in a few-mode optical fiber of the present invention can be specifically described as follows: Figure 4 As shown in the schematic diagram of the joint measurement device for differential mode delay and chromatic dispersion within a degenerate mode in a few-mode optical fiber, the device includes a light source, an intensity modulator, a mode converter, a mode orientation polarization perturbator, and a light detector, which are sequentially arranged along the optical path, as well as a sine wave generator electrically connected to the intensity modulator, a signal collector electrically connected to the light detector, and a computing unit digitally connected to the signal collector.

[0135] The working wavelength of the light source is adjustable, such as Figure 4 As shown, it includes a narrow-linewidth continuous laser light source and a polarization-maintaining single-mode optical fiber (the polarization-maintaining single-mode optical fiber will be directly connected to the intensity modulator as a connection line, which belongs to the internal structure of the light source. The light source includes a narrow-linewidth continuous laser light source and a polarization-maintaining single-mode optical fiber, which can be understood as a narrow-linewidth continuous laser light source with polarization-maintaining output); the narrow-linewidth continuous laser light source is used to provide linearly polarized narrow-linewidth continuous laser, the operating wavelength range can be between 850-1650nm, the continuously adjustable laser linewidth is less than 5MHz, and the laser power is continuously adjustable between 0-1W; the polarization-maintaining single-mode optical fiber transmits the linearly polarized light output by the narrow-linewidth continuous laser light source and forms a fundamental mode, and its output end is used to output light to the intensity modulator, and the output end can optionally be provided with a connector; the polarization-maintaining single-mode optical fiber is a bare optical fiber or a jumper.

[0136] The sine wave generator is used to generate a sine wave radio frequency signal, and can be optionally an adjustable radio frequency source. Its output end is used to output an electrical signal to the intensity modulator, and can be optionally an radio frequency connector.

[0137] The intensity modulator is used to modulate the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal, and can be optionally a lithium niobate modulator; its optical input end is used for light input and can be optionally connected to the light source; its optical output end is used to output light to the mode converter, and can optionally have a connector at the optical input and output ends; its electrical input end is used for electrical signal input and can be optionally connected to the sine wave generator.

[0138] The mode converter is used to convert the fundamental mode in the single-mode optical fiber into a specific degenerate mode in the few-mode optical fiber to be tested, and optionally both its input and output ends have optical fiber connectors based on jumpers.

[0139] The mode orientation polarization perturbator is used for continuously and at high frequency perturbing the spatial orientation and polarization state combination of the traversal degenerate mode, and optionally both the input and output ends thereof have optical fiber connectors based on jumpers.

[0140] The optical detector is used to convert optical signals into electrical signals. Its optical input end has an optical fiber connector based on a jumper, and its electrical output end is optionally connected to a time domain electrical signal acquisition unit. The optional electrical output end is a radio frequency connector.

[0141] The signal collector is used to collect electrical signals into digital signals, and can be a real-time oscilloscope.

[0142] The calculation unit is used to obtain the digital signal collected by the signal collector and calculate the degenerate mode intra-differential mode delay (corresponding to the above-mentioned degenerate mode intra-differential mode delay information) and degenerate mode chromatic dispersion of the measured degenerate mode in the measured few-mode optical fiber.

[0143] The joint measurement method of intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in a few-mode optical fiber using the above device may specifically include the following steps:

[0144] 1) Selecting a measured few-mode fiber of length L (corresponding to the above-mentioned few-mode fiber to be tested), placing it between the mode orientation polarization perturbator and the photodetector of the joint measurement device for intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in the above-mentioned few-mode fiber, adjusting the optical path, and measuring the optical power OP after passing through the mode converter, the mode orientation polarization perturbator, and the measured few-mode fiber;

[0145] The tested few-mode fiber takes the annular six-mode fiber as an example: supports LP 01 LP 11 LP 21 LP 02 LP 31 LP 12 There are six degenerate modes, among which LP 01 and LP 02The mode is a circularly symmetric degenerate mode, LP 11 LP 21 LP 31 and LP 12 It is a non-circularly symmetric degenerate mode; the length L of the measured optical fiber is 100 km, and its input and output ends are provided with connectors.

[0146] 2) placing the joint measurement device for intra-degenerate-mode differential mode delay and degenerate-mode chromatic dispersion in the few-mode optical fiber in a corresponding measurement state, and returning the measured intra-degenerate-mode differential mode delay, intra-degenerate-mode differential mode delay coefficient, and degenerate-mode chromatic dispersion coefficient of each degenerate mode in the measured few-mode optical fiber.

[0147] In the method for jointly measuring differential mode delay and chromatic dispersion of degenerate modes in a few-mode optical fiber, the length L of the measured few-mode optical fiber is between 0 and 100 km.

[0148] Step 2) in this example may specifically include the following steps:

[0149] a) placing a mode converter corresponding to the measured degenerate mode in the working optical path of the device for jointly measuring the differential mode delay and chromatic dispersion of the degenerate mode in the few-mode fiber, adjusting the output operating wavelength λ of the light source to 1550 nm, the output power to 13 dBm, setting the frequency f of the sine wave to 10 GHz, and turning on the mode toward the polarization perturbator;

[0150] b) The signal collector collects a time domain electrical signal for 1 minute, and obtains the intra-degenerate mode differential mode delay and the intra-degenerate mode differential mode delay coefficient of the measured degenerate mode in the measured few-mode optical fiber at the preset working wavelength calculated by the calculation unit; the specific calculation process is as follows: the calculation unit analyzes the collected digital signal and records the maximum value P of the digital signal max and the minimum value P min , at the operating wavelength λ, the differential mode delay Δτ within the measured degenerate mode in the measured few-mode fiber IDM-DMD The calculation formula is:

[0151]

[0152] Where arccos is the inverse cosine function. The differential mode delay coefficient C in the measured degenerate mode in the measured few-mode fiber IDM-DMD The calculation formula is:

[0153]

[0154] c) Obtaining the degenerate mode chromatic dispersion coefficient of the measured few-mode fiber at the preset operating wavelength calculated by the calculation unit. The specific calculation process is as follows: searching a lookup table of the magnitudes of digital signals corresponding to different power optical signals passing through the optical detector on the calculation unit, determining the magnitude P0 of the digital signal corresponding to OP. At the operating wavelength λ, the calculation formula for the measured degenerate mode chromatic dispersion coefficient of the measured few-mode fiber is:

[0155]

[0156] where c is the speed of light in a vacuum.

[0157] The test results are shown in Table 1. 01 The differential mode delay in the circularly symmetric degenerate mode after the mode is transmitted through 100km of circular six-mode fiber is 1.2ps, and the differential mode delay coefficient in the circularly symmetric degenerate mode is 0.12ps / km. 1 / 2 LP 11 The differential mode delay in the non-circularly symmetric degenerate mode after the mode is transmitted through a 100km circular six-mode optical fiber is 32.3ps, and the differential mode delay coefficient in the non-circularly symmetric degenerate mode is 3.23ps / km. 1 / 2 LP 21 The differential mode delay in the circularly symmetric degenerate mode after the mode is transmitted through 100 km of circular six-mode fiber is 37.4 ps, and the differential mode delay coefficient in the non-circularly symmetric degenerate mode is 3.74 ps / km. 1 / 2 LP 02 The differential mode delay in the circularly symmetric degenerate mode after the mode is transmitted through 100km of circular six-mode fiber is 1.4ps, and the differential mode delay coefficient in the circularly symmetric degenerate mode is 0.14ps / km. 1 / 2 LP 31 The differential mode delay in the non-circularly symmetric degenerate mode after the mode is transmitted through a 100km circular six-mode optical fiber is 41.4ps, and the differential mode delay coefficient in the non-circularly symmetric degenerate mode is 4.14ps / km. 1 / 2 LP 12 The differential mode delay in the non-circularly symmetric degenerate mode after the mode is transmitted through a 100km ring six-mode fiber is 55.3ps, and the differential mode delay coefficient in the non-circularly symmetric degenerate mode is 5.53ps / km. 1 / 2 .

[0158] Table 1 Measured differential mode delay and coefficients within the degenerate mode

[0159]

[0160] As shown in Table 2, the measured LP 01 The chromatic dispersion coefficient of the degenerate mode is 20.0ps / nm / km; LP 11The chromatic dispersion coefficient of the degenerate mode is 23.0ps / nm / km; LP 21 The chromatic dispersion coefficient of the degenerate mode is 23.8ps / nm / km; LP 02 The chromatic dispersion coefficient of the degenerate mode is 20.0ps / nm / km; LP 31 The chromatic dispersion coefficient of the degenerate mode is 24.1ps / nm / km; LP 12 The modal chromatic dispersion coefficient of the degenerate mode is 25.1 ps / nm / km.

[0161] Table 2 Measured degenerate mode chromatic dispersion coefficient

[0162]

[0163] As can be seen from the above, the solutions provided by the embodiments of the present invention involve:

[0164] (1) A device for jointly measuring differential mode delay and degenerate mode chromatic dispersion in a degenerate mode in a few-mode optical fiber, comprising a light source, an intensity modulator, a sine wave generator, a mode converter, a mode orientation polarization perturbator, a light detector, a signal collector, and a computing unit;

[0165] Among them, a time domain signal is generated by a sine wave generator, and the signal is collected by a light detector or the like.

[0166] (2) The measurement method corresponding to the device in (1);

[0167] This solution mainly generates a time domain signal through a sine wave generator, and then simultaneously measures the intra-mode differential mode delay and degenerate mode chromatic dispersion.

[0168] It is noted here that since both the intra-degenerate mode differential mode delay and the degenerate mode chromatic dispersion parameters ultimately manifest as signal broadening, the joint measurement of these two parameters in this solution can more accurately obtain the measurement results of these two parameters.

[0169] In summary, the beneficial effects of this solution are:

[0170] 1) The joint measurement device for differential mode delay and degenerate mode chromatic dispersion within a degenerate mode in a few-mode optical fiber provided by this solution realizes the detection of degenerate modes through the selection and design of a light source, an intensity modulator, a sine wave generator, a mode converter, a mode orientation polarization perturbator, a light detector, a signal collector, and a computing unit. It is simple, reliable, and highly integrated, and can conveniently and accurately perform joint measurement of differential mode delay and degenerate mode chromatic dispersion within a degenerate mode, solving the current problem of being unable to simultaneously measure differential mode delay and degenerate mode chromatic dispersion within a degenerate mode.

[0171] 2) The present invention provides a device for jointly measuring differential mode delay and degenerate mode chromatic dispersion within a degenerate mode in a few-mode optical fiber, and a method for jointly measuring differential mode delay and degenerate mode chromatic dispersion within a degenerate mode in a few-mode optical fiber based on the device, which have the advantages of fast measurement speed, large measurement dynamic range, and accurate measurement.

[0172] 3) The joint measurement method for intra-degenerate mode differential mode delay and degenerate mode chromatic dispersion in few-mode fiber provided by this solution can reduce the number of times the few-mode fiber is disassembled and assembled, and is simple to debug. The intra-degenerate mode differential mode delay, its coefficient, and degenerate mode chromatic dispersion can be obtained in a single debugging, which greatly reduces the workload and has a high degree of automation.

[0173] It is explained here that the few-mode fiber mentioned above refers to an optical fiber that supports multiple waveguide modes; the degenerate mode refers to a mode composed of eigenvector modes with similar effective refractive indices; the differential mode delay within the degenerate mode refers to the delay accumulated during the transmission process due to the slight difference in effective refractive index and propagation speed between the eigenvector modes within the same degenerate mode.

[0174] The embodiment of the present invention further provides an information measurement device, which is applied to the above-mentioned information measurement device, such as Figure 5 As shown, the device includes:

[0175] The first modulation module 51 is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source using an intensity modulator to form a modulated optical signal;

[0176] a conversion and transmission module 52, configured to convert the fundamental mode in the few-mode optical fiber to be tested into the degenerate mode to be tested using a mode converter, and to transmit the optical signal to the mode orientation polarization perturbator;

[0177] a disturbance sending module 53, configured to continuously perturb the spatial orientation and polarization state combination of the degenerate modes of the optical signal using the mode orientation polarization perturbator, and send the perturbed optical signal to the few-mode optical fiber to be tested;

[0178] A first conversion and transmission module 54 is configured to convert the optical signal passing through the few-mode optical fiber to be tested into an electrical signal using a light detector, and transmit the electrical signal to a signal collector;

[0179] A second conversion and transmission module 55 is used to convert the electrical signal into a digital signal using the signal collector and transmit the digital signal to the computing unit;

[0180] The first processing module 56 is configured to obtain, using the calculation unit and based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode.

[0181] The information measurement device provided by the embodiment of the present invention uses an intensity modulator to modulate the sinusoidal wave radio frequency signal generated by the sinusoidal wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; uses a mode converter to convert the fundamental mode in the few-mode optical fiber to be measured into the degenerate mode to be measured, and sends the optical signal to a mode orientation polarization perturbator; uses the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sends the perturbed optical signal to the few-mode optical fiber to be measured; uses an optical detector to convert the optical signal passing through the few-mode optical fiber to be measured into an electrical signal, and transmits it to a signal collector; uses the signal collector to convert the electrical signal into a digital signal, and transmits it to a computing unit; uses the The calculation unit obtains, based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information. This solution can achieve simple, rapid, and accurate joint measurement of two mode characteristic parameters: differential mode delay within the degenerate mode and degenerate mode chromatic dispersion. In addition, this solution can reduce the number of times the few-mode optical fiber is disassembled and assembled, and debugging is simple. The differential mode delay within the measured degenerate mode, its coefficient, and degenerate mode chromatic dispersion can be obtained in a single debugging, which greatly reduces the workload and has a high degree of automation. This solution effectively solves the problem in the prior art of being unable to accurately and simultaneously measure differential mode delay and degenerate mode chromatic dispersion within the degenerate mode.

[0182] The intra-degenerate mode differential mode delay information includes at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0183] In the embodiment of the present invention, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the maximum optical power P max and the minimum optical power P min , using Formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein, Formula 1 is: The Δτ IDM-DMDrepresents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0184] In an embodiment of the present invention, the step of obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested based on the digital signal further includes: obtaining, using the calculation unit, the differential mode delay value within the degenerate mode, and formula 2 to obtain the differential mode delay coefficient within the degenerate mode of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0185] In an embodiment of the present invention, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the computing unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length. max The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the digital signal size P0 and the maximum optical power P max , using Formula 3, the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested is obtained; wherein, Formula 3 is: The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0186] Among them, the implementation embodiments of the above-mentioned information measurement method are all applicable to the embodiments of the information measurement device and can achieve the same technical effects.

[0187] The embodiment of the present invention further provides an information measuring device, including the components included in the above-mentioned information measuring device, such as Figure 6 As shown, the device further includes: a processor 61 and a transceiver 62;

[0188] The processor 61 is configured to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser light emitted by the light source using an intensity modulator to form a modulated optical signal;

[0189] Using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator;

[0190] Utilizing the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sending the perturbed optical signal to the few-mode optical fiber to be tested;

[0191] Using a light detector, the optical signal passing through the few-mode optical fiber to be tested is converted into an electrical signal, and the electrical signal is transmitted to a signal collector;

[0192] The signal collector is used to convert the electrical signal into a digital signal, and transmit the digital signal to the computing unit;

[0193] The calculation unit is used to obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

[0194] The information measuring device provided by the embodiment of the present invention uses an intensity modulator to modulate the sinusoidal wave radio frequency signal generated by the sinusoidal wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; uses a mode converter to convert the fundamental mode in the few-mode optical fiber to be measured into the degenerate mode to be measured, and sends the optical signal to a mode orientation polarization perturbator; uses the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sends the perturbed optical signal to the few-mode optical fiber to be measured; uses an optical detector to convert the optical signal passing through the few-mode optical fiber to be measured into an electrical signal, and transmits it to a signal collector; uses the signal collector to convert the electrical signal into a digital signal, and transmits it to a computing unit; uses the The calculation unit obtains, based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information. This solution can achieve simple, rapid, and accurate joint measurement of two mode characteristic parameters: differential mode delay within the degenerate mode and degenerate mode chromatic dispersion. In addition, this solution can reduce the number of times the few-mode optical fiber is disassembled and assembled, and debugging is simple. The differential mode delay within the measured degenerate mode, its coefficient, and degenerate mode chromatic dispersion can be obtained in a single debugging, which greatly reduces the workload and has a high degree of automation. This solution effectively solves the problem in the prior art of being unable to accurately and simultaneously measure differential mode delay and degenerate mode chromatic dispersion within the degenerate mode.

[0195] The intra-degenerate mode differential mode delay information includes at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

[0196] In the embodiment of the present invention, the digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the maximum optical power P max and the minimum optical power P min , using Formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein, Formula 1 is: The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

[0197] In an embodiment of the present invention, the step of obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested based on the digital signal further includes: obtaining, using the calculation unit, the differential mode delay value within the degenerate mode, and formula 2 to obtain the differential mode delay coefficient within the degenerate mode of the few-mode optical fiber to be tested in the degenerate mode to be tested; wherein formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

[0198] In an embodiment of the present invention, the digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the computing unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length. max The calculation unit is used to obtain the signal broadening factor information of the few-mode optical fiber to be tested under the degenerate mode to be tested according to the digital signal, including: using the calculation unit according to the digital signal size P0 and the maximum optical power P max , using Formula 3, the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested is obtained; wherein, Formula 3 is: The D CDrepresents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

[0199] Among them, the implementation embodiments of the above-mentioned information measurement method are all applicable to the embodiments of the information measurement device and can achieve the same technical effects.

[0200] An embodiment of the present invention further provides an information measurement device, comprising a memory, a processor, and a program stored in the memory and executable on the processor; the processor implements the above-mentioned information measurement method when executing the program.

[0201] Among them, the implementation embodiments of the above-mentioned information measurement method are all applicable to the embodiments of the information measurement device and can achieve the same technical effects.

[0202] An embodiment of the present invention further provides a readable storage medium on which a program is stored. When the program is executed by a processor, the steps in the above-mentioned information measurement method are implemented.

[0203] Among them, the implementation embodiments of the above-mentioned information measurement method are all applicable to the embodiments of the readable storage medium and can also achieve the same technical effects.

[0204] It should be noted that many functional components described in this specification are referred to as modules in order to more particularly emphasize the independence of their implementation methods.

[0205] In embodiments of the present invention, modules can be implemented in software so that they can be executed by various types of processors. For example, an identified executable code module can include one or more physical or logical blocks of computer instructions, for example, which can be constructed as objects, procedures, or functions. Nevertheless, the executable code of the identified module does not need to be physically located together, but can include different instructions stored in different locations, which, when logically combined together, constitute the module and achieve the specified purpose of the module.

[0206] In fact, executable code module can be a single instruction or many instructions, and can even be distributed on a plurality of different code segments, distributed in the middle of different programs, and distributed across a plurality of memory devices.Similarly, operating data can be identified in the module, and can be implemented and organized in the data structure of any appropriate type according to any appropriate form.Described operating data can be collected as a single data set, or can be distributed in different locations (including on different storage devices), and can only be present on a system or network as an electronic signal at least in part.

[0207] When a module can be implemented using software, given the current state of hardware technology, those skilled in the art can build corresponding hardware circuits to implement the corresponding functions of the module, regardless of cost. The hardware circuits may include conventional very large scale integration (VLSI) circuits or gate arrays, as well as existing semiconductors such as logic chips and transistors, or other discrete components. Modules may also be implemented using programmable hardware devices, such as field programmable gate arrays, programmable array logic, or programmable logic devices.

[0208] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An information measuring device, characterized in that: include: A light source, an intensity modulator, a mode converter, and a mode orientation polarization perturbator connected in sequence; and, a light detector capable of being connected to the output end of the few-mode optical fiber to be measured; and, a computing unit connected to the light detector via a signal collector; The mode orientation polarization perturbator can be connected to the input end of the few-mode optical fiber to be tested; the intensity modulator is also connected to a sine wave generator; the intensity modulator modulates the sinusoidal radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; the mode orientation polarization perturbator continuously perturbs the spatial orientation and polarization state combination of the degenerate mode traversing the optical signal; The calculation unit can determine the signal broadening factor information of the few-mode optical fiber to be tested according to the signal collected by the signal collector; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode; The intra-degenerate mode differential mode delay information includes: at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient; the calculation unit is capable of determining the signal broadening factor information of the few-mode optical fiber to be tested based on the signal collected by the signal collector, including: The calculation unit calculates the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period. max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; And / or, the calculation unit obtains the degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested using Formula 2 according to the degenerate mode intra-differential mode delay value; Wherein, the formula 1 is: The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the ratio of pi; f represents the frequency of the sine wave generated by the sine wave generator; Wherein, the formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

2. An information measurement method, applied to the information measurement device according to claim 1, characterized in that: The method comprises: The intensity modulator is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source to form a modulated optical signal; Using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator; Utilizing the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sending the perturbed optical signal to the few-mode optical fiber to be tested; Using a light detector, the optical signal passing through the few-mode optical fiber to be tested is converted into an electrical signal, and the electrical signal is transmitted to a signal collector; The signal collector is used to convert the electrical signal into a digital signal, and transmit the digital signal to the computing unit; The calculation unit is used to obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

3. The information measurement method according to claim 2, characterized in that: The intra-degenerate mode differential mode delay information includes at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

4. The information measurement method according to claim 2, wherein: The digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min ; The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes: Utilize the calculation unit, according to the maximum optical power P max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula 1 is: The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

5. The information measurement method according to claim 4, characterized in that: The obtaining, by the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal further includes: Using the calculation unit, according to the intra-degenerate mode differential mode delay value, using Formula 2, obtain the intra-degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

6. The information measurement method according to claim 2, characterized in that: The digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the calculation unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length. max ; The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes: Utilize the calculation unit, according to the digital signal size P0 and the maximum optical power P max , using Formula 3, obtaining the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula three is: The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

7. An information measuring device, applied to the information measuring apparatus according to claim 1, characterized in that: The device comprises: The first modulation module is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source using an intensity modulator to form a modulated optical signal; A conversion and transmission module is used to convert the fundamental mode in the few-mode optical fiber to be tested into the degenerate mode to be tested by using a mode converter, and send the optical signal to the mode orientation polarization perturbator; a disturbance sending module, configured to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal using the mode orientation polarization perturbator, and send the perturbed optical signal to the few-mode optical fiber to be tested; A first conversion and transmission module is used to convert the optical signal passing through the few-mode optical fiber to be tested into an electrical signal using a light detector, and transmit the electrical signal to a signal collector; a second conversion and transmission module, configured to convert the electrical signal into a digital signal using the signal collector, and transmit the digital signal to the computing unit; The first processing module is configured to obtain, using the calculation unit and based on the digital signal, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested; the signal broadening factor information includes: differential mode delay information within the degenerate mode and chromatic dispersion information of the degenerate mode.

8. The information measuring device according to claim 7, characterized in that: The intra-degenerate mode differential mode delay information includes at least one of a degenerate mode intra-differential mode delay value and a degenerate mode intra-differential mode delay coefficient.

9. The information measuring device according to claim 7, characterized in that The digital signal includes: the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time period max and the minimum optical power P min ; The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes: Utilize the calculation unit, according to the maximum optical power P max and the minimum optical power P min , using formula 1, obtain the differential mode delay value of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula 1 is: The Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; π represents the circumference of a circle; and f represents the frequency of the sine wave generated by the sine wave generator.

10. The information measuring device according to claim 9, characterized in that The obtaining, by the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal further includes: Using the calculation unit, according to the intra-degenerate mode differential mode delay value, using Formula 2, obtain the intra-degenerate mode differential mode delay coefficient of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula 2 is: The C IDM-DMD represents the differential mode delay coefficient in the degenerate mode; the Δτ IDM-DMD represents the differential mode delay value in the degenerate mode; and L represents the length of the few-mode optical fiber to be tested.

11. The information measuring device according to claim 7, characterized in that: The digital signal includes: the digital signal size P0 corresponding to the optical power OP after passing through the mode converter, the mode orientation polarization perturbator and the few-mode optical fiber to be measured and after passing through the optical detector on the calculation unit; and the maximum optical power P corresponding to the time domain electrical signal collected by the signal collector within the first time length. max ; The obtaining, using the calculation unit, signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal includes: Utilize the calculation unit, according to the digital signal size P0 and the maximum optical power P max , using Formula 3, obtaining the degenerate mode chromatic dispersion coefficient in the degenerate mode chromatic dispersion information of the few-mode optical fiber to be tested in the degenerate mode to be tested; Wherein, the formula three is: The D CD represents the degenerate mode chromatic dispersion coefficient; c represents the speed of light in vacuum; π represents the circumference of a circle; L represents the length of the few-mode fiber to be tested; λ represents the output operating wavelength of the light source; and f represents the frequency of the sine wave generated by the sine wave generator.

12. An information measuring device comprising the components of the information measuring device according to claim 1, characterized in that: The device further comprises: a processor and a transceiver; The processor is used to modulate the sine wave radio frequency signal generated by the sine wave generator onto the linearly polarized laser emitted by the light source using an intensity modulator to form a modulated optical signal; Using a mode converter to convert the fundamental mode in the few-mode optical fiber to be tested into a degenerate mode to be tested, and sending the optical signal to a mode orientation polarization perturbator; Utilizing the mode orientation polarization perturbator to continuously perturb the spatial orientation and polarization state combination of the degenerate mode of the optical signal, and sending the perturbed optical signal to the few-mode optical fiber to be tested; Using a light detector, the optical signal passing through the few-mode optical fiber to be tested is converted into an electrical signal, and the electrical signal is transmitted to a signal collector; The signal collector is used to convert the electrical signal into a digital signal, and transmit the digital signal to the computing unit; The calculation unit is used to obtain signal broadening factor information of the few-mode optical fiber to be tested in the degenerate mode to be tested according to the digital signal; the signal broadening factor information includes: differential mode delay information within the degenerate mode and degenerate mode chromatic dispersion information.

13. An information measuring device comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the information measuring method according to any one of claims 2 to 6 is implemented.

14. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the steps of the information measuring method according to any one of claims 2 to 6 are realized.

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