CN112104414B

CN112104414B - Transmission medium detection method, device and storage medium

Info

Publication number: CN112104414B
Application number: CN202010790787.1A
Authority: CN
Inventors: 张鹏; 张翠红; 张建涛; 叶知隽
Original assignee: Accelink Technologies Co Ltd
Current assignee: Accelink Technologies Co Ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-03-11
Anticipated expiration: 2040-08-07
Also published as: CN112104414A

Abstract

The application discloses a transmission medium detection method, which comprises the following steps: a first analog-to-digital converter in the analog-to-digital converter group converts the received first test electrical signal into a first digital signal based on a first clock signal; a first sequence accumulator in a set of sequence accumulators generates a first accumulated signal in a set of accumulated signals based on the first digital signal; determining a performance of the transmission medium based on the set of accumulated signals; the phase of a clock signal corresponding to any analog-to-digital converter in the analog-to-digital converter group is different from the phase of a clock signal corresponding to other analog-to-digital converters in the analog-to-digital converter group; the application also discloses a transmission medium detection device and a storage medium, and the blind area detection index of the optical time domain reflectometer can be improved by the transmission medium detection method, the transmission medium detection device and the storage medium.

Description

Transmission medium detection method, device and storage medium

Technical Field

The present application relates to the field of optoelectronic signal processing technologies, and in particular, to a transmission medium detection method and apparatus, and a storage medium.

Background

An optical time-Domain Reflectometer (OTDR) is an important testing instrument in an optical fiber communication system, and an optical transmission module of the OTDR transmits a set optical pulse signal, and the reflected optical signal is converted by an optical receiving module according to the principle of backward fresnel reflection and rayleigh scattering, and then is subjected to data processing and analysis to obtain parameters such as average loss of a measured transmission medium. With the development of communication networks, the requirements of intelligent monitoring of optical fibers in the whole network come with the development of the optical fibers in the whole network, the requirements of access networks and the like on blind area indexes are more and more strict, and how to improve the blind area detection indexes of OTDR is a technical problem to be solved.

Disclosure of Invention

The embodiment of the application provides a medium transmission method, a medium transmission device and a storage medium, so that the blind area detection index of OTDR can be improved.

The technical scheme of the embodiment of the application is realized as follows:

in one aspect, an embodiment of the present application provides a transmission medium detection method, including:

a first analog-to-digital converter in the analog-to-digital converter group converts the received first test electrical signal into a first digital signal based on a first clock signal;

a first sequence accumulator in a set of sequence accumulators generates a first accumulated signal in a set of accumulated signals based on the first digital signal;

a filter and event calculator determining a performance of the transmission medium based on the set of accumulated signals;

the phase of the clock signal corresponding to any analog-to-digital converter in the analog-to-digital converter group is different from the phase of the clock signal corresponding to other analog-to-digital converters in the analog-to-digital converter group.

In the above solution, before the first analog-to-digital converter in the analog-to-digital converter group converts the received first test electrical signal into the first digital signal based on the first clock signal, the method further includes:

and performing photoelectric conversion and amplification on the test optical signal transmitted in the transmission medium to obtain a first test electrical signal.

In the foregoing solution, the generating a first accumulation signal by the first sequence accumulator based on the first digital signal includes:

and receiving all digital signals sent by the first analog-to-digital converter, and summing all the digital signals to generate the first accumulation signal.

In the above solution, after the first sequence accumulator in the group of sequence accumulators generates the first accumulated signal in the accumulated signal set based on the first digital signal, the method further includes:

a first sequence accumulator in the set of sequence accumulators sends the first accumulated signal to a first memory in a memory bank;

the first memory stores the first accumulated signal.

In the above solution, before the filtering and event calculator determines the performance of the transmission medium based on the accumulated signal set, the method further includes:

the filter and event calculator obtains the set of accumulated signals stored in the memory bank.

In the above solution, the acquiring, by the filtering and event calculator, the accumulated signal set stored in the memory bank includes:

the filtering and event calculator acquires accumulated signals stored in at least one memory based on a temporary address generated by an address generator for the at least one memory included in the memory group, and obtains the accumulated signal set.

In the above solution, the number of analog-to-digital converters included in the analog-to-digital converter group, the number of sequence accumulators included in the sequence accumulator group, and the number of memories included in the memory group are equal;

and/or the analog-to-digital converters included in the analog-to-digital converter group, the sequence accumulators included in the sequence accumulator group and the memories included in the memory group are in one-to-one correspondence.

In the above scheme, a phase of a clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of the analog-to-digital converters included in the analog-to-digital converter group.

In the foregoing solution, a phase of a clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of the analog-to-digital converters included in the analog-to-digital converter group, and includes:

the minimum value of the phase difference of the clock signals corresponding to any two analog-to-digital converters in the analog-to-digital converter group is 360 degrees/n;

wherein n is the number of analog-to-digital converters included in the analog-to-digital converter group.

On the other hand, an embodiment of the present application provides a transmission medium detection apparatus, including:

a set of analog-to-digital converters comprising a first analog-to-digital converter for converting a received first test electrical signal to a first digital signal based on a first clock signal;

a set of sequence accumulators including a first sequence accumulator for generating a first accumulated signal of a set of accumulated signals based on the first digital signal;

a filter and event calculator for determining a performance of the transmission medium based on the set of accumulated signals;

In the above scheme, the apparatus further comprises:

and the receiver is used for performing photoelectric conversion and amplification on the test optical signal transmitted in the transmission medium to obtain a first test electrical signal.

In the foregoing scheme, the first sequence accumulator is further configured to:

In the above scheme, the first sequence accumulator is further configured to send the first accumulation signal to a first memory in a memory group;

the apparatus also includes a first memory for storing the first accumulated signal.

In the foregoing solution, the filtering and event calculator is further configured to:

obtaining the accumulated set of signals stored in the memory bank prior to determining the performance of the transmission medium based on the accumulated set of signals.

and acquiring accumulated signals stored in at least one memory based on a temporary address generated by an address generator for the at least one memory included in the memory group to obtain the accumulated signal set.

According to the transmission medium detection method, the transmission medium detection device and the storage medium, different analog-to-digital converters are driven by clock signals with different phases, so that a plurality of analog-to-digital converters included in an analog-to-digital converter group can simultaneously and separately sample a test electric signal, and the purpose of improving distance resolution, namely blind area indexes is achieved; meanwhile, the sequence accumulators corresponding to different analog-to-digital converters and the memories corresponding to different analog-to-digital converters are used for accumulating and storing the electric signals sampled by different clock signals respectively, so that a plurality of low-frequency sampling modules can be equivalent to a high-frequency sampling module, the requirements of the analog-to-digital converters on the design and mass production consistency of a printed circuit board are reduced, and the aid is provided for commercialization.

Drawings

FIG. 1 is a schematic diagram of an optical fiber inspection apparatus according to the related art;

fig. 2 is a schematic view of an alternative flow chart of a transmission medium detection method according to an embodiment of the present application;

fig. 3 is a schematic view of another alternative flow chart of a transmission medium detection method according to an embodiment of the present application;

fig. 4 is a schematic diagram of an alternative structure of a transmission medium detection apparatus according to an embodiment of the present application;

fig. 5 is a schematic flow chart of yet another alternative transmission medium detection method provided in the embodiment of the present application;

fig. 6 is a schematic view of another alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application;

fig. 7 is a schematic diagram of yet another alternative flow chart of a transmission medium detection method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of yet another alternative transmission medium detection apparatus provided in an embodiment of the present application;

fig. 9 is a schematic diagram of still another alternative flow chart of a transmission medium detection method according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of yet another alternative transmission medium detection apparatus provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a further alternative transmission medium detection apparatus provided in an embodiment of the present application;

fig. 12 is a schematic view showing another operation of the optical fiber detecting apparatus according to the related art.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Under the premise of the rapid development of the communication field, the traditional communication lines (such as copper wires, cables, etc.) are gradually replaced by optical fibers, and the optical fibers have the advantages of small volume, light weight, high transmission rate, etc. Fiber optic networks have become an integral part of the communications field. However, problems with maintenance and inspection of the optical fiber itself also follow. The optical time domain reflectometer is an important testing instrument in an optical fiber communication system, a light emitting module of the optical time domain reflectometer emits a set optical pulse signal, the reflected optical signal is converted by a light receiving module according to the backward Fresnel reflection and Rayleigh scattering principles, and then data processing analysis is carried out to obtain parameters such as average loss of the measured optical fiber. The optical fiber link loss measuring device can measure the actual length and average loss of an optical fiber in an optical fiber communication system, and can detect, locate and measure many types of events on the optical fiber link, such as points with large loss formed by optical fiber fusion, connectors, bending and the like in the link. In the application of optical fiber communication, on one hand, in the application of practical engineering, the optical fiber communication system is used for on-site laying and later maintenance of a long-distance optical fiber communication system, and on the other hand, the optical time domain reflectometer can carry out on-line monitoring on the optical fiber communication network, quickly and accurately determine the position of an optical fiber fault point and ensure normal communication of the system.

FIG. 1 is a schematic diagram showing an operation of an optical fiber inspection apparatus according to the related art; fig. 12 is a schematic view showing another operation of the optical fiber detecting apparatus in the related art.

In fig. 1 or fig. 12, after receiving a user command, an analysis control unit in the OTDR device calculates the number N of pulses that need to be repeatedly sent according to the scanning time and the dynamic range requirement set by the user interface, and then, completes the working process as follows:

1) controlling a pulse generator to emit electric pulses, controlling a laser to generate optical pulses with narrow widths under the control of the electric pulses, injecting the optical pulses into a tested optical fiber through an optical coupling unit, transmitting the optical pulses in the optical fiber, returning backward scattered light from each point of the optical fiber to an injection end of the optical fiber, and reflecting the backward scattered light to a photoelectric conversion and signal conditioning unit through an optical fiber coupling unit;

2) the photoelectric conversion and signal conditioning unit has the function opposite to that of a laser, converts an optical signal into an analog electric signal, adjusts the analog electric signal into an ADC input working range, converts the analog electric signal into a digital signal through ADC sampling, receives the digital signal by a sequence accumulator, takes out data in a storage unit by the sequence accumulator, calculates the data, and then stores the data in the storage unit.

3) The analysis control unit repeats the operations of steps 1) and 2), which is equivalent to one reduction in the total number of times of N times when each operation is completed, and the process is repeated until the total number of times N is reached.

It is noted that, in the conventional method shown in fig. 1 or fig. 12, the clock signals of the digital circuits used in the transmitting and receiving portions of the dotted line are often the same frequency/phase.

However, in the practical process, the applicant finds that, along with the development of the communication network, the requirement of the intelligent monitoring of the optical fiber in the whole network comes along with the development of the communication network, and in the situation that the requirement on the blind area index is strict, such as the access network, the conventional structure of fig. 1 or fig. 12 encounters the following problem, in order to achieve the high blind area requirement, the frequency of the clock signal generated by the clock generator is very high, for example, 500MHz or more, and at such a high frequency, it is difficult to obtain the ADC device and the related PCB design of the appropriate index: or devices without such indicators; or the sampling bit number of the high-speed ADC device is too low, the index of the dynamic range needs to be sacrificed, and the application is limited; or the non-conventional products are difficult to buy; or is too expensive; or there are devices, but the PCB wiring requirements of the ADC are too high, and the PCBA signal quality design becomes an extreme challenge, and the target performance cannot be obtained in mass production or even in experimental products.

Based on the problems existing in the existing optical fiber detection method, the application provides a transmission medium detection method which can solve the technical problems and defects which cannot be solved in the prior art.

Fig. 2 is a schematic flow chart illustrating an alternative transmission medium detection method provided in an embodiment of the present application, and will be described according to various steps.

In step S101, a first analog-to-digital converter in the analog-to-digital converter group converts a received first test electrical signal into a first digital signal based on a first clock signal.

In some embodiments, a transmission medium detection apparatus (hereinafter referred to as an apparatus) includes an analog-to-digital converter group; the analog-to-digital converter group comprises at least one analog-to-digital converter; the first analog-to-digital converter is any one analog-to-digital converter in the analog-to-digital converter group. The number of analog-to-digital converters included in the group of analog-to-digital converters is a power of 2, such as 2, 4, 8, 16, etc. The transmission medium may include: twisted pair, coaxial cable, fiber optics, radio waves, infrared, microwave, or satellite, among others, are used to transmit optical or electrical signals.

In some embodiments, the first analog-to-digital converter converts the received first test electrical signal to a first digital signal based on a first clock signal, comprising: a first analog-to-digital converter samples the first test electrical signal based on a first clock signal, converting the first test electrical signal to a first digital signal. Further, the first clock signal includes: the device comprises a clock synthesis unit which sends a clock signal to the first analog-to-digital converter. The phases of the clock signals sent by the clock synthesis unit to different analog-to-digital converters are different. In this way, the group of analog-to-digital converters comprises analog-to-digital converters that can sample different phases of the test electrical signal.

In some embodiments, the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of analog-to-digital converters included in the analog-to-digital converter group. The minimum value of the phase difference of the clock signals corresponding to any two analog-to-digital converters in the analog-to-digital converter group is 360 degrees/n; wherein n is the number of analog-to-digital converters included in the analog-to-digital converter group. For example, in a case that the analog-to-digital converter group includes 2 analog-to-digital converters, where n is 2, the phase difference between the clock signals corresponding to the 2 analog-to-digital converters is 180 °, that is, the phase of the clock signal corresponding to one analog-to-digital converter is 0 °, and the phase of the clock signal corresponding to the other analog-to-digital converter is 180 °; or, in a case that the analog-to-digital converter group includes 4 analog-to-digital converters, n is 4, a minimum phase difference between the analog-to-digital converters is 90 °, and phase differences of the 4 analog-to-digital converters are respectively: 0 °, 90 °, 180 °, and 270 °.

In some embodiments, the first test electrical signal comprises: and the first test electrical signal is obtained after the test optical signal transmitted in the transmission medium is subjected to photoelectric conversion and amplification. Further, the performing of the photoelectric conversion and amplification of the test optical signal transmitted in the transmission medium includes: the test optical signal transmitted in the transmission medium is received by the photoelectric conversion and signal conditioning unit included in the device, the photoelectric conversion operation is executed, the test optical signal is converted into a test electrical signal, the test electrical signal is converted into a first test electrical signal by a first in-phase follower included in the in-phase follower group, and the first test electrical signal is transmitted to the first analog-to-digital converter.

In step S102, a first sequence accumulator in the set of sequence accumulators generates a first accumulated signal in the set of accumulated signals based on the first digital signal.

In some embodiments, the apparatus comprises a bank of sequence accumulators; the set of sequence accumulators includes at least one sequence accumulator; the first sequence accumulator is any one of the set of sequence accumulators.

In other embodiments, the apparatus further comprises a memory bank; the memory bank comprises at least one memory; the first memory is any one of the memory banks.

In still other embodiments, the number of analog-to-digital converters included in the analog-to-digital converter group, the number of in-phase followers included in the in-phase follower group, the number of sequence accumulators included in the sequence accumulator group, and the number of memories included in the memory group are equal; and/or the analog-to-digital converters included in the analog-to-digital converter group, the in-phase followers included in the in-phase follower group, the sequence accumulators included in the sequence accumulator group and the memories included in the memory group are in one-to-one correspondence. For example, a first digital signal output by the first analog-to-digital converter is only transmitted to the first sequence accumulator; the first sequence accumulator retrieves only first stored signals stored by the first memory and transmits only first accumulated signals to the first memory.

In some embodiments, the first sequence accumulator generating a first accumulated signal of the set of accumulated signals based on the first digital signal comprises: and the first sequence accumulator receives all digital signals sent by the first analog-to-digital converter, and sums all the digital signals to generate the first accumulated signal. In practical application, the apparatus sends q optical signals to the transmission medium, the first accumulator receives any one of the digital signals sent by the first analog-to-digital converter, and then performs summation processing with the digital signal before any one of the digital signals until a q-th digital signal is received, and accumulates the 1 st digital signal to the q-th digital signal to obtain a first accumulated signal.

In some embodiments, after the first sequence accumulator generates the first accumulated signal, the method further comprises: the first sequence accumulator sends the first accumulation signal to a first memory in a memory bank; the first memory stores the first accumulated signal. Wherein the accumulated signals stored between the memories included in the memory group are different.

Step S103, the filter and event calculator determines the performance of the transmission medium based on the accumulated signal set.

In some embodiments, the apparatus includes a filter and event calculator that determines a performance of the transmission medium based on the accumulated signal combination.

In some embodiments, the filtering and event calculator, in combination with the accumulated signal, determining the performance of the transmission medium comprises: the filtering and event calculator respectively filters accumulated signals stored in different memories in a memory group, and respectively determines the performance of the transmission medium based on the filtered curves; alternatively, the filter and event calculator schedules the set of accumulated signals stored by all of the memories from all of the memories included in the set of memories, filters the set of accumulated signals, and determines the performance of the transmission medium based on the filtered curve. The method for filtering the accumulated signal and determining the performance of the transmission medium based on the filtered curve is similar to that in the related art, and will not be described in detail herein.

In some embodiments, before the filter and event calculator determines the performance of the transmission medium based on the set of accumulated signals, the method further comprises: the filter and event calculator obtains the set of accumulated signals stored in the memory bank. The filter and event calculator obtaining the set of accumulated signals stored in the memory bank may include: the filter and event calculator schedules the set of accumulated signals stored by all memories included in the memory bank from all memories included in the memory bank; alternatively, the filtering and event calculator acquires the accumulated signal set stored in the memory group based on temporary addresses generated by an address generator for respective memories included in the memory group.

In some embodiments, said filter and event calculator schedules said set of memory-stored accumulated signals from all memories comprised by said memory bank, comprising: and the filtering and event calculator schedules all accumulated signals included in the accumulated signal group based on the memory serial number and the address serial number.

The filtering and event calculator may schedule an order of all accumulated signals included in the accumulated signal group based on the memory sequence number and the address sequence number, and may include: the address k of the mth memory is the nth x k + m addresses scheduled by the filtering and event calculator. Where n is the number of total memories included in the memory bank. For example, in the case where n is 2, the filtering and event calculator takes address 0 of the 1 st memory as the 1 st address; taking address 0 of the 2 nd memory as the 2 nd address; taking address 1 of the 1 st memory as a 3 rd address; taking address 1 of the 2 nd memory as a 4 th address; taking address 2 of the 1 st memory as a 5 th address; address 2 of the 2 nd memory is set as the 6 th address, and so on.

In still other embodiments, the filtering and event calculator retrieving the sets of accumulated signals stored in the memory banks based on temporary addresses generated by an address generator for respective memories included in the memory banks comprises: the address generator generating temporary addresses for respective memories included in the memory group; the filter and evener retrieves the set of accumulated signals stored in memory based on the temporary address.

The address generator generating temporary addresses for respective memories included in the memory group includes: and the address generator generates temporary addresses of all memories in the memory group based on the memory serial numbers and the address serial numbers, wherein the temporary address of the address k of the mth memory is n x k + m. For example, when n is 2, the temporary address of address 0 of the 1 st memory is the 1 st address; the temporary address of address 0 of the 2 nd memory is the 2 nd address; the temporary address of the address 1 of the 1 st memory is the 3 rd address; the temporary address of the address 1 of the 2 nd memory is the 4 th address; the temporary address of the address 2 of the 1 st memory is the 5 th address; the temporary address of address 2 of the 2 nd memory is the 6 th address, etc. Further, the filtering and event calculator sequentially obtains accumulated signals stored in each memory in the memory group from small to large based on the sequence number of the temporary address.

Thus, the address generator generates temporary addresses for the memories in the memory group, and the filtering and event calculator acquires data in the memory group; compared with the prior art in which addressing is performed sequentially from low to high, in the embodiment of the application, the filtering and event calculator performs round-robin incremental addressing in each storage unit included in the memory group based on the temporary address generated by the address generator, so that more data can be acquired, the resolution is further improved, and the blind area index is improved.

Therefore, according to the transmission medium detection method provided by the embodiment of the application, different analog-to-digital converters are driven by clock signals with different phases, so that a plurality of analog-to-digital converters included in the analog-to-digital converter group can simultaneously and separately sample a test electric signal in phases, and the purpose of improving distance resolution, namely a blind area index is achieved; meanwhile, the sequence accumulators corresponding to different analog-to-digital converters and the memories corresponding to different analog-to-digital converters are used for accumulating and storing the electric signals sampled by different clock signals respectively, so that a plurality of low-frequency sampling modules can be equivalent to a high-frequency sampling module, the requirements of the analog-to-digital conversion module on the design and mass production consistency of a printed circuit board are reduced, and the aid is provided for commercialization.

Fig. 3 is a schematic diagram illustrating another alternative flow chart of a transmission medium detection method provided in an embodiment of the present application; fig. 4 is a schematic diagram illustrating an alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application, which will be described with reference to fig. 3.

In step S201, the transmitter transmits a test light signal.

In some embodiments, the transmitter of the transmission medium detection apparatus includes: controlling the pulse generator, the laser and the optical coupling unit.

The control pulse generator sends an electric pulse to the laser; the laser generates a test optical signal based on the electrical pulse; the test optical signal is sent to a transmission medium to be tested through the optical coupling unit; the test optical signal propagates in the transmission medium to be tested, and backscattering of points included along the transmission medium returns to the input end of the transmission medium.

In some embodiments, controlling a pulse generator to send an electrical pulse to the laser based on a clock signal, the clock signal corresponding to a blind spot indicator; the clock signal is not subjected to frequency division processing, namely the clock signal comprises the frequencies of all phases; thus, the number of times of repeatedly sending pulses is ensured, and the index of the dynamic range of the OTDR is ensured. The dynamic range of the OTDR is defined as the difference, expressed in dB, between the energy of the initially backscattered light signal and the level that drops to a certain noise level. The receiving circuit with high sensitivity can more easily receive the interference of various types of noise, and for a stable noise source, a conventional filter such as FIR (finite impulse response), wavelet transform and the like can be well inhibited, but for the application of OTDR (optical time domain reflectometer), the noise has the special characteristic that in order to improve the signal-to-noise ratio, a method of transmitting optical pulses for multiple times, accumulating a return optical signal sequence for multiple times, calculating an arithmetic mean to obtain a waveform with higher signal-to-noise ratio, and then carrying out filtering or event extraction calculation application is generally adopted.

In step S202, the receiver receives the test optical signal.

In some embodiments, the receiver of the transmission medium detection apparatus includes: a photoelectric conversion and signal conditioning unit and an in-phase follower group. The in-phase follower group includes at least two in-phase followers, and in this embodiment, the example in which the in-phase follower group includes 2 in-phase followers is described. Accordingly, the number of analog-to-digital converters included in the analog-to-digital converter group, the number of in-phase followers included in the in-phase follower group, the number of sequence accumulators included in the sequence accumulator group, and the number of memories included in the memory group are equal, that is, in the present embodiment, the apparatus further includes 2 analog-to-digital converters, 2 sequence accumulators, and 2 memories.

In some embodiments, the test optical signal transmitted in the transmission medium is received by a photoelectric conversion and signal conditioning unit included in the apparatus, and is converted into a test electrical signal by performing a photoelectric conversion operation, and the test electrical signal is converted into a first test electrical signal and a second test electrical signal by a first in-phase follower and a second in-phase follower included in a set of in-phase followers, and is transmitted to the first analog-to-digital converter and the second analog-to-digital converter, respectively. The first test electrical signal is the same as or different from the second test electrical signal. The first test electrical signal being the same as the second test electrical signal may include: the amplification factors of the first in-phase follower and the second in-phase follower are the same; the first test electrical signal being different from the second test electrical signal may include: the first in-phase follower and the second in-phase follower have different amplification factors.

The first analog-to-digital converter and the second analog-to-digital converter have the same processing manner for the received test electrical signal, and in this embodiment, the first analog-to-digital converter is taken as an example for description.

In some embodiments, the first analog-to-digital converter converts the received first test electrical signal to a first digital signal based on a first clock signal, comprising: a first analog-to-digital converter samples the first test electrical signal based on a first clock signal, converting the first test electrical signal to a first digital signal. Further, the first clock signal includes: the device comprises a clock synthesis unit which sends a clock signal to the first analog-to-digital converter.

In some embodiments, the analog-to-digital converter group includes 2 analog-to-digital converters, and the phase difference between the clock signals of the 2 analog-to-digital converters is 180 °, that is, the phase of the clock signal corresponding to the first analog-to-digital converter is 0 ° and the phase of the clock signal corresponding to the second analog-to-digital converter is 180 °. Accordingly, a first analog-to-digital converter converts the first test electrical signal to a first digital signal at 0 ° phase; the second analog-to-digital converter converts the second test electrical signal to a second digital signal with a 180 ° phase. In this way, the group of analog-to-digital converters comprises analog-to-digital converters that can sample different phases of the test electrical signal.

In step S203, the sequence accumulator set generates an accumulation signal set based on the first digital signal and the second digital signal.

In some embodiments, the apparatus comprises a bank of sequence accumulators; the set of sequence accumulators includes a first column accumulator and a second sequence accumulator.

In other embodiments, the apparatus further comprises a memory bank; the memory bank includes a first memory and a second memory. The first sequence accumulator and the second sequence accumulator process the received digital signal in the same manner, and in this embodiment, the first sequence accumulator is taken as an example for description.

In some embodiments, the set of accumulation signals comprises a first accumulation signal generated by a first sequence accumulator and a second accumulation signal generated by a second sequence accumulator.

Step S204, based on the accumulated signal set, determining the performance of the transmission medium.

In some embodiments, the filtering and event calculator, in combination with the accumulated signal, determining the performance of the transmission medium comprises: the filtering and event calculator filters accumulated signals stored in different memories in a memory bank, respectively, and determines the performance of the transmission medium based on the filtered curves, respectively. The method for filtering the accumulated signal and determining the performance of the transmission medium based on the filtered curve is similar to that in the related art, and will not be described in detail herein.

The filtering and event calculator may schedule an order of all accumulated signals included in the accumulated signal group based on the memory sequence number and the address sequence number, and may include: the address k of the mth memory is the 2 x k + m addresses scheduled by the filtering and event calculator. For example, the filter and event calculator takes address 0 of the 1 st memory as the 1 st address; taking address 0 of the 2 nd memory as the 2 nd address; taking address 1 of the 1 st memory as a 3 rd address; taking address 1 of the 2 nd memory as a 4 th address; taking address 2 of the 1 st memory as a 5 th address; address 2 of the 2 nd memory is set as the 6 th address, and so on.

Fig. 5 is a schematic flow chart illustrating a further alternative transmission medium detection method provided in an embodiment of the present application; fig. 6 is a schematic diagram illustrating another alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application, which will be described with reference to fig. 5.

In step S401, the transmitter emits a test light signal.

In this embodiment, the specific process of step S401 is the same as step S201, and is not repeated here.

In step S402, the receiver receives the test optical signal.

In this embodiment, the specific process of step S402 is the same as step S202, and is not repeated here.

In step S403, the sequence accumulator bank generates an accumulation signal set based on the first digital signal and the second digital signal.

In this embodiment, the specific process of step S403 is the same as step S203, and is not repeated here.

In step S404, the address generator generates temporary addresses for the respective memories included in the memory group.

In some embodiments, the address generator generating the temporary address for each memory included in the memory bank comprises: and the address generator generates temporary addresses of all memories in the memory group based on the memory serial numbers and the address serial numbers, wherein the temporary address of the address k of the mth memory is n x k + m. For example, in the present embodiment, when n is 2, the temporary address of address 0 of the 1 st memory is the 1 st address; the temporary address of address 0 of the 2 nd memory is the 2 nd address; the temporary address of the address 1 of the 1 st memory is the 3 rd address; the temporary address of the address 1 of the 2 nd memory is the 4 th address; the temporary address of the address 2 of the 1 st memory is the 5 th address; the temporary address of address 2 of the 2 nd memory is the 6 th address, etc.

Step S405, determining the performance of the transmission medium based on the accumulated signal set.

In some embodiments, the filtering and event calculator, in combination with the accumulated signal, determining the performance of the transmission medium comprises: the filtering and event calculator acquires the accumulated signal set stored in the memory group based on temporary addresses generated by the address generator for the memories included in the memory group; the filtering and event calculator respectively filters accumulated signals stored in different memories in a memory group, and respectively determines the performance of the transmission medium based on the filtered curves; alternatively, the filter and event calculator schedules the set of accumulated signals stored by all of the memories from all of the memories included in the set of memories, filters the set of accumulated signals, and determines the performance of the transmission medium based on the filtered curve. The method for filtering the accumulated signal and determining the performance of the transmission medium based on the filtered curve is similar to that in the related art, and will not be described in detail herein.

In some embodiments, the filtering and event calculator, based on the temporary addresses generated by the address generator for the respective memories included in the memory bank, obtaining the set of accumulated signals stored in the memory bank comprises: the address generator generating temporary addresses for respective memories included in the memory group; the filter and evener retrieves the set of accumulated signals stored in memory based on the temporary address.

In some embodiments, the filtering and event calculator sequentially obtains accumulated signals stored in the respective memories in the memory group from small to large based on the sequence number of the temporary address.

Fig. 7 is a schematic diagram illustrating yet another alternative flow chart of a transmission medium detection method according to an embodiment of the present application; fig. 8 is a schematic diagram illustrating another alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application, which will be described with reference to fig. 7.

In step S301, the transmitter transmits a test light signal.

In this embodiment, the specific process of step S301 is the same as step S201, and is not repeated here.

In step S302, the receiver receives the test optical signal.

In some embodiments, the receiver of the transmission medium detection apparatus includes: a photoelectric conversion and signal conditioning unit and an in-phase follower group. The in-phase follower group includes at least two in-phase followers, and in this embodiment, an example in which the in-phase follower group includes 4 in-phase followers is described. Accordingly, the number of analog-to-digital converters included in the analog-to-digital converter group, the number of in-phase followers included in the in-phase follower group, the number of sequence accumulators included in the sequence accumulator group, and the number of memories included in the memory group are equal, that is, in the present embodiment, the apparatus further includes 4 analog-to-digital converters, 4 sequence accumulators, and 4 memories.

In some embodiments, after being received by the optical-to-electrical conversion and signal conditioning unit included in the apparatus, the test optical signal transmitted in the transmission medium is subjected to an optical-to-electrical conversion operation, and is converted into a test electrical signal, and the test electrical signal is converted into a first test electrical signal, a second test electrical signal, a third test electrical signal, and a fourth test electrical signal after being respectively subjected to a first in-phase follower, a second in-phase follower, a third in-phase follower, and a fourth in-phase follower included in an in-phase follower group, and is respectively transmitted to the first analog-to-digital converter, the second analog-to-digital converter, the third analog-to-digital converter, and the fourth analog-to-digital converter. The first test electrical signal, the second test electrical signal, the third test electrical signal, and the fourth test electrical signal are the same. The first analog-to-digital converter, the second analog-to-digital converter, the third analog-to-digital converter, and the fourth analog-to-digital converter have the same processing manner for the received test electrical signal, and in this embodiment, the first analog-to-digital converter is taken as an example for description.

In some embodiments, the clock synthesis unit is configured to perform two functions of frequency division and phase change, and output low frequency clock phase 0/low frequency clock phase 90/low frequency clock phase 180/low frequency clock phase 270 as a result of frequency division of the N _ ADC of the clock signal clk, the four output signals are in a same frequency fixed phase relationship, the phase of the low frequency clock phase 0 is 0 °, the phase of the low frequency clock phase 90 is 90 °, the phase of the low frequency clock phase 180 is 180 °, and the phase of the low frequency clock phase 270 is 270 °.

In some embodiments, the analog-to-digital converter group includes 4 analog-to-digital converters, the phase difference between the clock signals corresponding to the 4 analog-to-digital converters is 360 °/4 ═ 90 °, that is, the phase of the clock signal corresponding to the first analog-to-digital converter is 0 °, the phase of the clock signal corresponding to the second analog-to-digital converter is 90 °, the phase of the clock signal corresponding to the third analog-to-digital converter is 180 °, and the phase of the clock signal corresponding to the fourth analog-to-digital converter is 270 °. Accordingly, a first analog-to-digital converter converts the first test electrical signal to a first digital signal at 0 ° phase; the second analog-to-digital converter converts the second test electrical signal to a second digital signal at a 90 ° phase; said third analog-to-digital converter converting said third test electrical signal to a third digital signal at a 180 ° phase; the fourth analog-to-digital converter converts the fourth test electrical signal to a fourth digital signal at a 270 ° phase. In this way, the group of analog-to-digital converters comprises analog-to-digital converters that can sample different phases of the test electrical signal.

Particularly, a high-frequency analog-to-digital conversion chip is a current scarce product, but a low-frequency analog-to-digital conversion chip is common, for example, a 500Mhz/12bit ADC chip is a scarce product on the market in 2019, but a 125M/12bit ADC chip is common; the use of a plurality of low-frequency sampling analog-to-digital converters for sampling different phases of the test electrical signal can achieve the effect of one high-frequency sampling analog-to-digital converter, and the requirement on the design and volume production consistency of the printed circuit board is obviously lower than that of a high-speed product, thereby providing help for commercialization.

In step S303, the sequence accumulator set generates an accumulation signal set based on the first digital signal, the second digital signal, the third digital signal and the fourth digital signal.

In some embodiments, the apparatus comprises a bank of sequence accumulators; the sequence accumulator group comprises a first sequence accumulator, a second sequence accumulator, a third sequence accumulator and a fourth sequence accumulator.

In other embodiments, the apparatus further comprises a memory bank; the memory bank includes a first memory and a second memory. The first sequence accumulator, the second sequence accumulator, the third sequence accumulator and the fourth sequence accumulator process the received digital signals in the same manner.

In some embodiments, the set of accumulation signals comprises a first accumulation signal generated by a first sequence accumulator, a second accumulation signal generated by a second sequence accumulator, a third accumulation signal generated by a third sequence accumulator, and a fourth accumulation signal generated by a fourth sequence accumulator.

Step S304, based on the accumulated signal set, determining the performance of the transmission medium.

In some embodiments, before the filter and event calculator determines the performance of the transmission medium based on the set of accumulated signals, the method further comprises: the filter and event calculator obtains the set of accumulated signals stored in the memory bank. The filter and event calculator obtaining the set of accumulated signals stored in the memory bank may include: the filter and event calculator schedules the set of accumulated signals stored by all of the memories included in the memory bank from all of the memories included in the memory bank.

The filtering and event calculator may schedule an order of all accumulated signals included in the accumulated signal group based on the memory sequence number and the address sequence number, and may include: the address k of the mth memory is the 4 th x k + m addresses scheduled by the filtering and event calculator, and the address 0 of the 1 st memory is the 1 st address of the filtering and event calculator; taking address 0 of the 2 nd memory as the 2 nd address; taking address 0 of the 3 rd memory as a 3 rd address; taking address 0 of the 4 th memory as a 4 th address; taking address 1 of the 1 st memory as a 5 th address; address 1 of the 2 nd memory is set as the 6 th address, and so on.

Therefore, the transmission medium detection method provided by the embodiment of the application reserves the structure of the transmitting part of a typical OTDR, improves the receiving part to generate a clock signal to be subjected to frequency division to obtain n fixed phase difference clocks, the phase difference values are equal in pairs in sequence, each clock signal is respectively used for driving the corresponding analog-to-digital converters, namely the analog-to-digital converters are used for sampling the same time division phase of the received signal subjected to photoelectric conversion, the phase change achieves the purpose of improving the distance resolution, namely the blind area index, and meanwhile, the important index of the OTDR in the low dynamic range is ensured not to be degraded. The receiving part uses a sequence accumulator group, a clock synthesis unit, an analog-to-digital converter group, a memory group and an in-phase follower group. In addition, the addressing mode of the filtering and event calculator is optimized correspondingly.

Fig. 9 is a schematic diagram illustrating still another alternative flow of a transmission medium detection method according to an embodiment of the present application; fig. 10 is a schematic diagram illustrating still another alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application, which will be described with reference to fig. 9.

In step S501, the transmitter transmits a test light signal.

In this embodiment, the specific process of step S501 is the same as step S301, and is not repeated here.

Step S502, the receiver receives the test optical signal.

In this embodiment, the specific process of step S502 is the same as step S302, and is not repeated here.

In step S503, the sequence accumulator group generates an accumulation signal set based on the first digital signal, the second digital signal, the third digital signal and the fourth digital signal.

In this embodiment, the specific process of step S503 is the same as step S303, and is not repeated here.

In step S504, the address generator generates temporary addresses for the respective memories included in the memory group.

In some embodiments, the address generator generating the temporary address for each memory included in the memory bank comprises: the address generator generates temporary addresses of all memories in the memory group based on the memory serial numbers and the address serial numbers, the address k of the mth memory is the 4 x k + m addresses scheduled by the filtering and event calculator, and the address 0 of the 1 st memory is used as the 1 st address by the filtering and event calculator; taking address 0 of the 2 nd memory as the 2 nd address; taking address 0 of the 3 rd memory as a 3 rd address; taking address 0 of the 4 th memory as a 4 th address; taking address 1 of the 1 st memory as a 5 th address; address 1 of the 2 nd memory is set as the 6 th address, and so on.

Step S505, determining the performance of the transmission medium based on the accumulated signal set.

Fig. 11 is a schematic diagram illustrating still another alternative structure of a transmission medium detection apparatus provided in an embodiment of the present application, which will be described according to various parts.

In some embodiments, the transmission medium detection apparatus 500 includes: an analog-to-digital converter bank 501, a sequence accumulator bank 502 and a filter and event calculator 503.

The group of analog-to-digital converters 501 comprises a first analog-to-digital converter 5011, wherein the first analog-to-digital converter 5011 is used for converting a received first test electrical signal into a first digital signal based on a first clock signal; the analog-to-digital converter group includes a first analog-to-digital converter 5011, a second analog-to-digital converter 5012 to an nth analog-to-digital converter 501 n.

The bank of sequence accumulators 502, the bank of sequence accumulators 502 comprising a first sequence accumulator 5021, the first sequence accumulator 5021 for generating a first accumulated signal of a set of accumulated signals based on the first digital signal; the sequence accumulator group includes a first sequence accumulator 5021, a second sequence accumulator 5022 through an nth sequence accumulator 502 n.

The filter and event calculator 503 is configured to determine the performance of the transmission medium based on the accumulated signal set;

the phase of the clock signal corresponding to any one of the analog-to-digital converters included in the analog-to-digital converter group 501 is different from the phase of the clock signal corresponding to the other analog-to-digital converters in the analog-to-digital converter group 501.

In some embodiments, the transmission medium detection apparatus 500 further includes: a receiver 504.

The receiver 504 is configured to perform photoelectric conversion and amplification on the test optical signal transmitted in the transmission medium, and obtain a first test electrical signal.

The first sequence accumulator 5021 is further configured to: and receiving all digital signals sent by the first analog-to-digital converter, and summing all the digital signals to generate the first accumulation signal.

The first sequence accumulator 5021 is further configured to send the first accumulated signal to a first memory in a memory bank;

in some embodiments, the transmission medium detection apparatus 500 further includes: an address generation unit 506.

The address generating unit 506 is configured to generate temporary addresses for the respective storages included in the memory; the temporary address is used for the filtering and event calculator to obtain a set of accumulated signals stored in a memory bank.

In some embodiments, the filter and event calculator is further configured to retrieve the set of accumulated signals stored in the memory bank based on temporary addresses generated by an address generator for respective memories included in the memory bank.

In some embodiments, the transmission medium detection apparatus 500 further includes: a memory bank 505.

The memory bank 505 comprises a first memory 5051 for storing the first accumulated signal. The memory group 505 includes a first sequence accumulator 5051, a second memory 5052 through an nth memory 505 n.

In some embodiments, the number of analog-to-digital converters included in the analog-to-digital converter group 501, the number of sequence accumulators included in the sequence accumulator group 502, and the number of memories included in the memory group are equal;

and/or the analog-to-digital converters included in the analog-to-digital converter 501 group, the sequence accumulators included in the sequence accumulator group 502, and the memories included in the memory group 505 correspond one to one.

In some embodiments, the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group 501 is related to the number of analog-to-digital converters included in the analog-to-digital converter group 501.

In some embodiments, the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group 501 is related to the number of the analog-to-digital converters included in the analog-to-digital converter group 501, and includes:

the minimum value of the phase difference of the clock signals corresponding to any two analog-to-digital converters in the analog-to-digital converter group 501 is 360 °/n; where n is the number of analog-to-digital converters included in the analog-to-digital converter group 501.

Those of ordinary skill in the art will understand that: all or part of the steps of implementing the above method embodiments may be implemented by hardware related to program commands, and the foregoing program may be stored in a storage medium, where the storage medium includes: various media capable of storing program codes, such as a removable Memory device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.

Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially implemented in the form of a software product stored in a storage medium, and include several commands for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A transmission medium detection method, the method comprising:

a first sequence accumulator in the set of sequence accumulators sends the first accumulated signal to a first memory in a memory bank; the first memory stores the first accumulated signal;

the filtering and event calculator acquires accumulated signals stored in at least one memory based on a temporary address generated by an address generator for the at least one memory included in the memory group to obtain an accumulated signal set;

the filter and event calculator determining a performance of the transmission medium based on the set of accumulated signals;

2. The method of claim 1, wherein prior to a first analog-to-digital converter of the set of analog-to-digital converters converting the received first test electrical signal to a first digital signal based on a first clock signal, the method further comprises:

3. The method of claim 1, wherein the first sequence accumulator generating a first accumulated signal based on the first digital signal comprises:

and the first sequence accumulator receives all digital signals sent by the first analog-to-digital converter, and sums all the digital signals to generate the first accumulated signal.

4. The method according to any one of claims 1 to 3,

the number of analog-to-digital converters included in the analog-to-digital converter group, the number of sequence accumulators included in the sequence accumulator group and the number of memories included in the memory group are equal;

5. The method of claim 4,

the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of the analog-to-digital converters included in the analog-to-digital converter group.

6. The method of claim 5, wherein the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of analog-to-digital converters included in the analog-to-digital converter group, and comprises:

7. A transmission medium detection apparatus, characterized in that the apparatus comprises:

the first sequence accumulator is further used for sending the first accumulation signal to a first memory in a memory group; the apparatus further comprises a memory bank comprising a first memory for storing the first accumulated signal;

the filtering and event calculator is further operable to: acquiring accumulated signals stored in at least one memory based on a temporary address generated by an address generator for the at least one memory included in the memory group to obtain the accumulated signal set;

8. The apparatus of claim 7, further comprising:

9. The apparatus of claim 7, wherein the first sequence accumulator is further configured to:

10. The apparatus according to any one of claims 7 to 9,

11. The apparatus of claim 10,

12. The apparatus of claim 11, wherein the phase of the clock signal corresponding to any one of the analog-to-digital converters in the analog-to-digital converter group is related to the number of analog-to-digital converters included in the analog-to-digital converter group, and comprises:

13. A storage medium storing an executable program, wherein the executable program, when executed by a processor, implements the transmission medium detection method of any one of claims 1 to 6.

14. A transmission medium detection apparatus comprising a memory, a processor and an executable program stored on the memory and executable by the processor, wherein the steps of the transmission medium detection method according to any one of claims 1 to 6 are performed when the executable program is executed by the processor.