CN111740777A - Optical fiber line fault detection system and detection method - Google Patents
Optical fiber line fault detection system and detection method Download PDFInfo
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- CN111740777A CN111740777A CN202010772124.7A CN202010772124A CN111740777A CN 111740777 A CN111740777 A CN 111740777A CN 202010772124 A CN202010772124 A CN 202010772124A CN 111740777 A CN111740777 A CN 111740777A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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Abstract
The application discloses optical fiber line fault detection system and detection method, wherein, optical fiber line fault detection system links together the transmitting optical fiber that optical module to be measured connects and the expansion end of received light, has constituted a complete light return circuit, and the optical module transmitting optical fiber's that awaits measuring transmitting optical fiber's transmitting optical power and the received optical power of received light can be in this light return circuit this one end of optical module to be measured is passed through the network management unit of optical module self that awaits measuring acquires simultaneously, need not to set up detection facilities such as measurement personnel and optical power meter respectively at the optical fiber line both ends, and the convenience is strong, and the degree of accuracy is high, when improving optical fiber line fault detection efficiency, has reduced optical fiber line fault detection's personnel and equipment cost.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to a system and a method for detecting a fault in an optical fiber line.
Background
An optical module (optical module) is composed of modules such as an optoelectronic device, a functional circuit and an optical interface, and is mainly used for converting an electrical signal into an optical signal and sending the optical signal through an optical fiber, receiving the optical signal returned by the optical fiber and converting the returned optical signal into the electrical signal, and the optical module is an important device in the field of optical communication.
An optical fiber line connected with an optical module is one of important factors determining communication quality, in the prior art, when a fault diagnosis method for the optical fiber line is used, an optical power meter is generally adopted to measure at two ends of the optical fiber line, if the two ends of the optical fiber line are far away, professional technicians are often required to be arranged at the two ends to perform fault judgment, so that the fault detection efficiency of the optical fiber line is undoubtedly reduced, and the personnel and equipment cost for fault detection of the optical fiber line is increased.
Disclosure of Invention
In order to solve the technical problem, the application provides an optical fiber line fault detection system and a detection method, so as to achieve the purposes of improving the detection efficiency of optical fiber line fault detection and reducing the personnel and equipment cost of optical fiber line fault detection.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a fiber optic line fault detection system comprising: an optical module to be tested; wherein the content of the first and second substances,
the optical module to be tested comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a transmitting optical fiber, the receiving end is connected with a receiving optical fiber, and the transmitting optical fiber is connected with the movable end of the receiving optical fiber;
the optical module that awaits measuring still includes: a network management unit and a fault judgment unit; wherein the content of the first and second substances,
the network management unit is used for acquiring the transmitting light power and the receiving light power of the optical module to be tested;
and the fault judging unit is used for judging whether the optical fiber line of the optical module to be tested has a fault according to the transmitting optical power and the receiving optical power of the optical module to be tested.
Optionally, the fault determination unit is specifically configured to calculate a loss coefficient of an optical fiber line of the optical module to be tested according to the transmitted optical power and the received optical power of the optical module to be tested, determine that the optical fiber line of the optical module to be tested has a fault when the loss coefficient of the optical fiber line of the optical module to be tested is greater than a loss coefficient threshold, and determine that the optical fiber line of the optical module to be tested is normal when the loss coefficient of the optical fiber line of the optical module to be tested is less than or equal to the loss coefficient threshold.
Optionally, the fault determining unit calculates a loss coefficient of an optical fiber line of the optical module to be tested according to the transmitting optical power and the receiving optical power of the optical module to be tested,
substituting the transmitting light power and the receiving light power of the optical module to be tested into a first preset formula so as to calculate and obtain the loss coefficient of the optical fiber line of the optical module to be tested;
the first preset formula includes:
α represents the loss coefficient of the optical fiber circuit of the optical module to be tested, PoutRepresenting the emitted optical power, P, of the optical module under testinAnd L represents the total length of an optical fiber line of the optical module to be tested.
Optionally, the fault determining unit is specifically configured to calculate an optical fiber loss value of an optical fiber line of the optical module to be detected according to the transmitting optical power and the receiving optical power of the optical module to be detected, determine whether a difference between the optical fiber loss threshold and a preset optical fiber loss threshold is within a preset interval, determine that the optical fiber line of the optical module to be detected is normal if the difference is within the preset interval, and determine that a fault exists in the optical fiber line of the optical module to be detected if the difference is not within the preset interval.
Optionally, the optical module to be tested further includes: the device comprises a voltage division unit, a control unit and a receiving unit; wherein the content of the first and second substances,
the receiving unit is used for receiving a return light signal and converting the return light signal into an electric signal;
the control unit comprises an analog-to-digital conversion interface and a plurality of selection interfaces; the analog-to-digital conversion interface is electrically connected with the output interface of the receiving unit, and the plurality of selection interfaces are respectively electrically connected with the plurality of voltage division output interfaces of the voltage division unit;
a voltage division input interface of the voltage division unit is electrically connected with a connection node of the analog-to-digital conversion interface and an output interface of the receiving unit;
the voltage division unit is used for determining output voltages of multiple levels according to the electric signals;
the control unit is configured to receive an output voltage of a level corresponding to a default state combination when the plurality of selection interfaces are in the default state combination, determine the received optical power according to the received output voltage, and control the state combination of the plurality of selection interfaces according to the received optical power when a value of the received optical power is determined not within a preset power range, so as to adjust the level of the received output voltage, and re-determine the received optical power according to the adjusted output voltage.
Optionally, the voltage dividing unit includes a plurality of resistors;
the resistors are numbered from 1 to N in sequence and connected in series in sequence, a connecting node of every two resistors serves as a voltage division output interface, one end, not connected with other resistors, of the resistor numbered as 1 serves as a voltage division input port, one end, not connected with other resistors, of the resistor numbered as N is grounded, and N is a positive integer greater than or equal to 2.
Optionally, the method further includes: a fault warning module;
and the fault alarm module is used for sending alarm information when the optical fiber circuit of the optical module to be tested has a fault.
A fiber optic line fault detection method, comprising:
providing an optical module to be tested, wherein the optical module to be tested comprises a transmitting end and a receiving end, the transmitting end is connected with a transmitting optical fiber, and the receiving end is connected with a receiving optical fiber; the optical module that awaits measuring still includes: a network management unit and a fault judgment unit;
connecting the movable ends of the transmitting optical fiber and the receiving optical fiber together;
acquiring the transmitting light power and the receiving light power of the optical module to be tested by using the network management unit;
and judging whether the optical fiber line of the optical module to be detected has a fault or not by using the fault judgment unit according to the transmitting optical power and the receiving optical power of the optical module to be detected.
Optionally, the determining, by using the fault determining unit, whether a fault exists in the optical fiber line of the optical module to be tested according to the transmitting optical power and the receiving optical power of the optical module to be tested includes:
substituting the transmitting light power and the receiving light power of the optical module to be tested into a first preset formula by using the fault judgment unit so as to calculate and obtain the loss coefficient of the optical fiber line of the optical module to be tested;
the first preset formula includes:
α represents the loss coefficient of the optical fiber circuit of the optical module to be tested, PoutRepresenting the emitted optical power, P, of the optical module under testinThe receiving optical power of the optical module to be tested is represented, and L represents the total length of an optical fiber circuit of the optical module to be tested;
when the loss coefficient of the optical fiber line of the optical module to be tested is larger than a loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested has a fault, and when the loss coefficient of the optical fiber line of the optical module to be tested is smaller than or equal to the loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested is normal;
or
Calculating an optical fiber loss value of an optical fiber line of the optical module to be detected according to the transmitting optical power and the receiving optical power of the optical module to be detected, judging whether a difference value between the optical fiber loss threshold value and a preset optical fiber loss threshold value is in a preset interval, if so, judging that the optical fiber line of the optical module to be detected is normal, and if not, judging that the optical fiber line of the optical module to be detected has a fault.
Optionally, after the determining, by the fault determining unit, whether the optical fiber line of the optical module to be tested has a fault according to the transmitting optical power and the receiving optical power of the optical module to be tested, the method further includes:
and sending alarm information when the optical fiber line of the optical module to be tested has a fault.
According to the technical scheme, the optical fiber line fault detection system and the detection method are provided, wherein the optical fiber line fault detection system connects the transmitting optical fiber connected with the optical module to be detected and the movable end of the receiving optical fiber together to form a complete optical loop, the transmitting optical power of the transmitting optical fiber and the receiving optical power of the receiving optical fiber of the optical module to be detected in the optical loop can be simultaneously acquired at the end of the optical module to be detected through the network management unit of the optical module to be detected, detection equipment such as detection personnel and an optical power meter do not need to be arranged at two ends of an optical fiber line, convenience is high, accuracy is high, the efficiency of optical fiber line fault detection is improved, and the cost of personnel and equipment for optical fiber line fault detection is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fiber circuit fault detection system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an optical module according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical module according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a fiber circuit fault detection system according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a communication terminal according to an embodiment of the present application;
fig. 6 is a schematic flowchart of a method for detecting a fault of an optical fiber line according to an embodiment of the present application.
Detailed Description
As described in the background art, when the optical power meter is used for fault diagnosis of the optical fiber line in the prior art, detection personnel and the optical power meter need to be respectively arranged at two ends of the optical fiber line, so that not only is the detection efficiency low, but also the personnel cost and the equipment cost are high.
Besides the method for detecting the fault of the optical fiber line by using an optical power meter method, the method also comprises two fault diagnosis methods, wherein the decibel comprises the following steps:
(1) the network management unit can monitor the optical power of the optical module in real time through the DDM (Digital Diagnostic Monitoring) of the optical module, but the optical power value read by the terminal device on one side is sent to the terminal device on the other side in an information communication manner. If the optical fiber loss is serious and exceeds the range of the receiving sensitivity of the optical module, the data of the terminal equipment on two sides cannot be communicated, and the optical fiber loss cannot be calculated.
(2) OTDR (optical time-Domain Reflectometer). Although the OTDR can locate the specific fault of the optical fiber, it is expensive, inconvenient to carry, and has certain requirements on the professional knowledge of the user, and it is generally not used in the ordinary engineering acceptance.
As can be seen from the above description, there are various problems in the prior art for a fault diagnosis method for an optical fiber line, and in order to improve the efficiency of fault detection for the optical fiber line and reduce the cost of fault detection, an embodiment of the present application provides an optical fiber line fault detection system, including: the device comprises a power detection module, an optical module to be detected and a fault judgment unit; wherein the content of the first and second substances,
the optical module to be tested comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a transmitting optical fiber, the receiving end is connected with a receiving optical fiber, and the transmitting optical fiber is connected with the movable end of the receiving optical fiber;
the optical module that awaits measuring still includes: a network management unit and a fault judgment unit; wherein the content of the first and second substances,
the network management unit is used for acquiring the transmitting light power and the receiving light power of the optical module to be tested;
and the fault judging unit is used for judging whether the optical fiber line of the optical module to be tested has a fault according to the transmitting optical power and the receiving optical power of the optical module to be tested.
The optical fiber line fault detection system connects the transmitting optical fiber connected with the optical module to be detected and the movable end of the receiving optical fiber together to form a complete optical loop, the transmitting optical power of the transmitting optical fiber and the receiving optical power of the receiving optical fiber of the optical module to be detected in the optical loop can be obtained at the end of the optical module to be detected through the network management unit of the optical module to be detected, detection equipment such as detection personnel and an optical power meter does not need to be arranged at the two ends of an optical fiber line respectively, the convenience is high, the accuracy is high, and the personnel and equipment cost for optical fiber line fault detection is reduced while the optical fiber line fault detection efficiency is improved.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides an optical fiber line fault detection system, as shown in fig. 1, including: an optical module to be tested 10; wherein the content of the first and second substances,
the optical module to be tested 10 comprises a transmitting end T and a receiving end R, wherein the transmitting end T is connected with a transmitting optical fiber 12, the receiving end R is connected with a receiving optical fiber 11, and the transmitting optical fiber 12 is connected with the movable end of the receiving optical fiber 11;
the optical module that awaits measuring still includes: a network management unit 20 and a failure determination unit 30; wherein the content of the first and second substances,
the network management unit 20 is configured to obtain the transmitting optical power and the receiving optical power of the optical module 10 to be tested;
the fault determining unit 30 is configured to determine whether a fault exists in an optical fiber line of the optical module 10 to be tested according to the transmitting optical power and the receiving optical power of the optical module 10 to be tested.
In this embodiment, the optical module to be tested 10 is disposed in one terminal, and normally, the other end of the transmitting optical fiber 12 connected to the optical module to be tested 10 is connected to the receiving end R of the optical module in another terminal, and the other end of the receiving optical fiber 11 connected to the optical module to be tested 10 is connected to the transmitting end T of the optical module in another terminal, but in this embodiment, in order to perform fault detection on the optical fiber line of the optical module to be tested 10, the other end of the transmitting optical fiber 12 connected to the transmitting end T of the optical module to be tested 10 is connected to the other end of the receiving optical fiber 11 connected to the receiving end R of the optical module to be tested 10 through the movable optical fiber connector 40, so that the one end of the optical module to be tested 10 can be simultaneously obtained by the network management unit of the optical module to be tested itself, that is able, detection equipment such as detection personnel and optical power meters do not need to be arranged at the two ends of the optical fiber circuit respectively, convenience is high, detection efficiency is improved, and detection cost is reduced.
The specific function of the failure determination unit 30 is executed by a network management unit in the communication terminal, so that additional detection equipment is not required, and the method is high in convenience and accuracy.
Referring to fig. 2, fig. 2 shows a schematic structural diagram of an optical module in a normal case, and the optical module generally further includes a laser driver, a control unit, a receiving unit, a transmitting unit, and a limiting amplifier.
In the process of transmitting an optical signal, the control unit controls the laser driver to control a light source (usually a laser diode LD) in the transmitting unit to transmit the optical signal, an automatic optical power control APC module is usually further built in the laser driver to realize optical power control of the laser diode LD, a resonant cavity of the laser diode LD has two reflecting mirrors, light transmitted by the front mirror is transmitted to the transmitting fiber 12 through coupling with the transmitting fiber 12 to be transmitted, light emitted by the rear reflecting mirror is generally called as backward light, and a backlight detector (generally, a detection photodiode MD can be selected) monitors the backward light to convert the backward light into a backward current. The magnitude of this back current is proportional to the magnitude of the optical power incident on the photodetector and also proportional to the emitted optical power of the light coupled into the emitting optical fiber 12, so that the emitted optical power of the optical module can be detected by detecting the current of the back light. However, in practical applications, direct sampling of the magnitude of the back photocurrent cannot be achieved, and in practice, the back photocurrent needs to be converted into a voltage and then subjected to ADC (Analog-to-Digital Converter) sampling. In fig. 2, the backward photoelectric current output by the monitoring photodiode is grounded through a first resistor R1, a sampling voltage is formed on the first resistor R1 and reported to the control unit, the corresponding relationship between the sampling voltage and the optical power can be determined by means of a lookup table, and after the transmitted optical power is determined, the control unit stores the obtained transmitted optical power in a register.
The receiving unit comprises a photoelectric detector PD, a transimpedance amplifier TIA and other structures, wherein the photoelectric detector PD is used for receiving a return light Signal and converting the return light Signal into an electric Signal, the transimpedance amplifier TIA is connected with the photoelectric detector PD and used for amplifying the electric Signal, and the transimpedance amplifier is provided with an RSSI (Received Signal Strength indication) pin (receiving end R Signal intensity indication Signal). The RSSI pin is grounded through a second resistor R2, forming a sampled voltage across the second resistor R2. An ADC pin of the control unit is connected to the RSSI pin, and is configured to sample and acquire an RSSI signal (i.e., an electrical signal) output by the RSSI pin and convert the RSSI signal into a digital signal, where the digital signal is referred to as a sampling value, and the subsequent control unit determines a specific received optical power by using a lookup table or the like, and the determined received optical power is also stored in a register of the control unit.
The network management unit 20 obtains the received optical power and the transmitted optical power by reading the received optical power and the transmitted optical power stored in the optical module controller MCU.
The following describes a practical process of the fault determining unit 30 determining whether there is a fault in the optical fiber line of the optical module 10 to be tested.
Optionally, in an embodiment of the present application, the fault determining unit 30 is specifically configured to calculate a loss coefficient of an optical fiber line of the optical module 10 to be tested according to the transmitting optical power and the receiving optical power of the optical module 10 to be tested, determine that the optical fiber line of the optical module 10 to be tested has a fault when the loss coefficient of the optical fiber line of the optical module 10 to be tested is greater than a loss coefficient threshold, and determine that the optical fiber line of the optical module 10 to be tested is normal when the loss coefficient of the optical fiber line of the optical module 10 to be tested is less than or equal to the loss coefficient threshold.
Wherein, the failure determination unit 30 calculates a loss coefficient of the optical fiber line of the optical module 10 to be tested according to the transmitting optical power and the receiving optical power of the optical module 10 to be tested,
substituting the transmitting light power and the receiving light power of the optical module to be tested 10 into a first preset formula to calculate and obtain a loss coefficient of an optical fiber line of the optical module to be tested 10;
the first preset formula includes:
α represents the loss coefficient of the optical fiber line of the optical module 10 to be tested, PoutRepresents the emitted optical power, P, of the optical module 10 under testinRepresenting the optical module to be tested10, L represents the total length of the optical fiber line of the optical module to be tested 10.
The loss factor of the optical fiber line refers to the attenuation of the optical fiber per unit length, and the unit is Db/km. The height of the optical fiber line directly affects the distance of transmission or the distance between relay stations. Therefore, in general, when the loss factor of the optical fiber line is too large, it usually means that the optical fiber line has a fault.
In addition, in an embodiment of the present application, the fault determining unit 30 is specifically configured to calculate an optical fiber loss value of an optical fiber line of the optical module to be tested 10 according to the transmitting optical power and the receiving optical power of the optical module to be tested 10, determine whether a difference between the optical fiber loss threshold and a preset optical fiber loss threshold is within a preset interval, determine that the optical fiber line of the optical module to be tested 10 is normal if the difference is within the preset interval, and determine that the optical fiber line of the optical module to be tested 10 has a fault if the difference is not within the preset interval.
In this embodiment, the optical fiber loss value of the optical fiber line of the optical module 10 to be tested is equal to the difference between the emitted optical power and the received optical power, and this optical fiber loss value represents the loss of the light emitted by the optical module after being transmitted through the optical fiber line, so if this value is too large (or not within the preset interval), it means that the optical fiber line has a fault.
The specific value of the optical fiber loss threshold can be set according to factors such as the length and the material of an optical fiber line, and the calculation formula can be expressed as follows: the optical fiber loss threshold is equal to the preset optical fiber loss coefficient multiplied by the optical fiber length plus the preset fusion loss. The preset optical fiber loss coefficient can be determined according to factors such as the length and the material of an optical fiber line, for example, for the wavelength of the g.652 optical fiber 1310, the value range of the theoretical preset optical fiber loss coefficient can be 0.2 to 0.3 dB/km.
The fusion loss can be roughly divided into two types of intrinsic factors and extrinsic factors of the optical fiber, wherein the intrinsic factors comprise the inconsistency of the diameters of the mode fields of the optical fiber; the diameters of two optical fibers are mismatched; the section of the fiber core is out of round; the core and cladding are not perfectly concentric. The extrinsic factors are mainly influenced by the splicing technology, including the operation level of splicing personnel, the operation steps, the coiling process level and the like.
The value of the preset dissolution loss can be set to 0.1dB or 0.09dB and the like.
On the basis of the above embodiment, in another embodiment of the present application, referring to fig. 3, the optical module to be tested 10 further includes: a voltage dividing unit 13, a control unit 14, and a receiving unit 15; wherein the content of the first and second substances,
the receiving unit 15 is configured to receive a return light signal and convert the return light signal into an electrical signal;
the control unit 14 comprises an analog-to-digital conversion interface ADC and a plurality of selection interfaces; the analog-to-digital conversion interface is electrically connected with the output interface of the receiving unit, and the plurality of selection interfaces are respectively electrically connected with the plurality of voltage division output interfaces of the voltage division unit;
a voltage division input interface of the voltage division unit 13 is electrically connected with a connection node of the analog-to-digital conversion interface and an output interface of the receiving unit;
the voltage dividing unit 13 is configured to determine output voltages of multiple levels according to the electrical signal;
the control unit 14 is configured to receive an output voltage of a level corresponding to a default state combination when the plurality of selection interfaces are in the default state combination, determine the received optical power according to the received output voltage, and control the state combination of the plurality of selection interfaces according to the received optical power when a value of the received optical power is determined to be not within a preset power range, so as to adjust the level of the received output voltage, and re-determine the received optical power according to the adjusted output voltage.
In fig. 3, the number of selection interfaces is exemplarily illustrated as 2, and two selection interfaces are respectively denoted by GPIO-1 and GPIO-2.
In this embodiment, the main difference from the optical module shown in fig. 2 is that a voltage dividing unit 13 is added, and the control unit 14 can implement selective reception of output voltages of different levels of the voltage dividing unit by controlling the state combination of the selection interface.
Still referring to fig. 3, the voltage dividing unit 13 includes a plurality of resistors;
the resistors are numbered from 1 to N in sequence and connected in series in sequence, a connecting node of every two resistors serves as a voltage division output interface, one end, not connected with other resistors, of the resistor numbered as 1 serves as a voltage division input port, one end, not connected with other resistors, of the resistor numbered as N is grounded, and N is a positive integer greater than or equal to 2.
In fig. 3, taking N ═ 3 as an example for explanation, in order to improve accuracy of received optical power, when the received optical power of the output voltage conversion corresponding to the default state combination is smaller, the control unit 14 may adjust the state combinations of a plurality of the selection interfaces to access more resistors to obtain a larger sampling voltage, thereby improving detection accuracy of received optical power and ensuring accuracy of received optical power.
Of course, when the received optical power is large, the voltage sampling value detected by the control unit 14 may exceed the voltage range that can be collected by the control unit 14 or exceed the value of the look-up table of the internal register of the control unit, thereby causing the received optical power measurement to be invalid. At the moment, less resistance can be connected through adjusting the state combination of the plurality of selection interfaces, so that the voltage sampling value detected by the control unit is reduced.
Specifically, when the control Unit 14 is a Micro Control Unit (MCU), the selection interface may be a General-Purpose I/O interface (GPIO interface), assuming that the resistors numbered 1, 2, and 3 in fig. 3 are respectively a third resistor R3, a fourth resistor R4, and a fifth resistor R5, and in order to calculate that the resistances of the three resistors may be the same, the two GOIO interfaces are respectively named GPIO-1 and GPIO-2, the GPIO-1 is connected to a connection node (common terminal) of the third resistor R3 and the fourth resistor R4, the GPIO-2 is connected to a connection node of the fourth resistor R4 and the fifth resistor R5, and in a default state, the GPIO-1 is in a high-resistance state, the GPIO-2 is in a low-resistance state, the third resistor R3 and the fourth resistor R4 are connected to the control Unit, and the sampling voltage of the control Unit 14 is (R3+ R4) 48325IRSSI。
When the sampling voltage is too small, the control unit 14 controls the GPIO-1 to be high impedanceIn the state where GPIO-2 is in the high impedance state, the fifth resistor R5 is also connected to the control unit, and the sampling voltage of the control unit 14 is (R3+ R4+ R5) × IRSSI。
When the sampling voltage is too large, the control unit 14 controls the GPIO-1 to be in a low-resistance state and the GPIO-2 to be in a high-resistance state, only the third resistor R3 is connected into the control unit, and the sampling voltage of the control unit 14 is R3 × IRSSI。
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 4, the fiber circuit fault detection system further includes: a fault warning module 50;
the fault alarm module 50 is configured to send alarm information when a fault exists in an optical fiber line of the optical module 10 to be tested.
The alarm information may be an acoustic alarm information or an optical alarm information.
Accordingly, an embodiment of the present application further provides a communication terminal 100, which may be a communication terminal operating in practical applications, as shown in fig. 5, including: the optical module 120 and the network management unit 20, the network management unit 20 is connected to the controller MCU of the optical module 120 through the IIC bus, and receives the received optical power and the transmitted optical power from the controller MCU. When any optical module 120 needs to be used as an optical module 10 to be detected to detect an optical fiber line thereof, the transmitting optical fiber 12 connected to the transmitting end T of the optical module can be connected to the active end of the receiving optical fiber 11 connected to the receiving end R of the optical module, so that light emitted by the optical module 10 to be detected can be received by the receiving end R of the optical module, and further, the detection of an optical fiber line fault is realized through the network management unit 20 and the fault determination unit 30 which are built in the network management unit 110.
The fiber circuit fault detection method provided by the embodiment of the present application is described below, and the fiber circuit fault detection method described below may be referred to in correspondence with the fiber circuit fault detection system described above.
Correspondingly, an embodiment of the present application further provides a method for detecting a fault of an optical fiber line, as shown in fig. 6, including:
s101: providing an optical module to be tested, wherein the optical module to be tested comprises a transmitting end and a receiving end, the transmitting end is connected with a transmitting optical fiber, and the receiving end is connected with a receiving optical fiber; the optical module that awaits measuring still includes: a network management unit and a fault judgment unit;
s102: connecting the movable ends of the transmitting optical fiber and the receiving optical fiber together;
s103: acquiring the transmitting light power and the receiving light power of the optical module to be tested by using the network management unit;
s104: and judging whether the optical fiber line of the optical module to be detected has a fault or not by using the fault judgment unit according to the transmitting optical power and the receiving optical power of the optical module to be detected.
Optionally, the determining, by using the fault determining unit, whether a fault exists in the optical fiber line of the optical module to be tested according to the transmitting optical power and the receiving optical power of the optical module to be tested includes:
substituting the transmitting light power and the receiving light power of the optical module to be tested into a first preset formula by using the fault judgment unit so as to calculate and obtain the loss coefficient of the optical fiber line of the optical module to be tested;
the first preset formula includes:
α represents the loss coefficient of the optical fiber circuit of the optical module to be tested, PoutRepresenting the emitted optical power, P, of the optical module under testinThe receiving optical power of the optical module to be tested is represented, and L represents the total length of an optical fiber circuit of the optical module to be tested;
when the loss coefficient of the optical fiber line of the optical module to be tested is larger than a loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested has a fault, and when the loss coefficient of the optical fiber line of the optical module to be tested is smaller than or equal to the loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested is normal;
or
Calculating an optical fiber loss value of an optical fiber line of the optical module to be detected according to the transmitting optical power and the receiving optical power of the optical module to be detected, judging whether a difference value between the optical fiber loss threshold value and a preset optical fiber loss threshold value is in a preset interval, if so, judging that the optical fiber line of the optical module to be detected is normal, and if not, judging that the optical fiber line of the optical module to be detected has a fault.
Optionally, after the determining, by the fault determining unit, whether the optical fiber line of the optical module to be tested has a fault according to the transmitting optical power and the receiving optical power of the optical module to be tested, the method further includes:
and sending alarm information when the optical fiber line of the optical module to be tested has a fault.
To sum up, the embodiment of the application provides an optical fiber line fault detection system and a detection method, wherein, optical fiber line fault detection system links together the transmitting optical fiber that optical module to be detected connects and the expansion end of received light, has constituted a complete light loop, and the optical module transmitting optical fiber's that awaits measuring transmitting optical power and the received optical power of received light can be in this light loop this one end of optical module to be measured is passed through optical module's self network management unit of awaiting measuring acquires simultaneously, need not to set up detection facilities such as measurement personnel and optical power meter respectively at the optical fiber line both ends, and the convenience is strong, and the degree of accuracy is high, when improving optical fiber line fault detection efficiency, has reduced optical fiber line fault detection's personnel and equipment cost.
Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A fiber optic line fault detection system, comprising: an optical module to be tested; wherein the content of the first and second substances,
the optical module to be tested comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a transmitting optical fiber, the receiving end is connected with a receiving optical fiber, and the transmitting optical fiber is connected with the movable end of the receiving optical fiber;
the optical module that awaits measuring still includes: a network management unit and a fault judgment unit; wherein the content of the first and second substances,
the network management unit is used for acquiring the transmitting light power and the receiving light power of the optical module to be tested;
and the fault judging unit is used for judging whether the optical fiber line of the optical module to be tested has a fault according to the transmitting optical power and the receiving optical power of the optical module to be tested.
2. The optical fiber line fault detection system according to claim 1, wherein the fault determination unit is specifically configured to calculate a loss coefficient of the optical fiber line of the optical module to be tested according to the transmitted optical power and the received optical power of the optical module to be tested, determine that the optical fiber line of the optical module to be tested has a fault when the loss coefficient of the optical fiber line of the optical module to be tested is greater than a loss coefficient threshold, and determine that the optical fiber line of the optical module to be tested is normal when the loss coefficient of the optical fiber line of the optical module to be tested is less than or equal to the loss coefficient threshold.
3. The optical fiber line fault detection system according to claim 2, wherein the fault determination unit calculates a loss factor of the optical fiber line of the optical module under test according to the transmitted optical power and the received optical power of the optical module under test,
substituting the transmitting light power and the receiving light power of the optical module to be tested into a first preset formula so as to calculate and obtain the loss coefficient of the optical fiber line of the optical module to be tested;
the first preset formula includes:
α represents the loss coefficient of the optical fiber circuit of the optical module to be tested, PoutRepresenting the emitted optical power, P, of the optical module under testinAnd L represents the total length of an optical fiber line of the optical module to be tested.
4. The optical fiber line fault detection system according to claim 1, wherein the fault determination unit is specifically configured to calculate an optical fiber loss value of the optical fiber line of the optical module to be tested according to the transmitted optical power and the received optical power of the optical module to be tested, determine whether a difference between the optical fiber loss threshold and a preset optical fiber loss threshold is within a preset interval, determine that the optical fiber line of the optical module to be tested is normal if the difference is within the preset interval, and determine that the optical fiber line of the optical module to be tested has a fault if the difference is not within the preset interval.
5. The fiber circuit fault detection system of claim 1, wherein the optical module under test further comprises: the device comprises a voltage division unit, a control unit and a receiving unit; wherein the content of the first and second substances,
the receiving unit is used for receiving a return light signal and converting the return light signal into an electric signal;
the control unit comprises an analog-to-digital conversion interface and a plurality of selection interfaces; the analog-to-digital conversion interface is electrically connected with the output interface of the receiving unit, and the plurality of selection interfaces are respectively electrically connected with the plurality of voltage division output interfaces of the voltage division unit;
a voltage division input interface of the voltage division unit is electrically connected with a connection node of the analog-to-digital conversion interface and an output interface of the receiving unit;
the voltage division unit is used for determining output voltages of multiple levels according to the electric signals;
the control unit is configured to receive an output voltage of a level corresponding to a default state combination when the plurality of selection interfaces are in the default state combination, determine the received optical power according to the received output voltage, and control the state combination of the plurality of selection interfaces according to the received optical power when a value of the received optical power is determined not within a preset power range, so as to adjust the level of the received output voltage, and re-determine the received optical power according to the adjusted output voltage.
6. The fiber circuit fault detection system of claim 5, wherein the voltage dividing unit includes a plurality of resistors;
the resistors are numbered from 1 to N in sequence and connected in series in sequence, a connecting node of every two resistors serves as a voltage division output interface, one end, not connected with other resistors, of the resistor numbered as 1 serves as a voltage division input port, one end, not connected with other resistors, of the resistor numbered as N is grounded, and N is a positive integer greater than or equal to 2.
7. The fiber optic line fault detection system of claim 1, further comprising: a fault warning module;
and the fault alarm module is used for sending alarm information when the optical fiber circuit of the optical module to be tested has a fault.
8. A method of fiber optic line fault detection, comprising:
providing an optical module to be tested, wherein the optical module to be tested comprises a transmitting end and a receiving end, the transmitting end is connected with a transmitting optical fiber, and the receiving end is connected with a receiving optical fiber; the optical module that awaits measuring still includes: a network management unit and a fault judgment unit;
connecting the movable ends of the transmitting optical fiber and the receiving optical fiber together;
acquiring the transmitting light power and the receiving light power of the optical module to be tested by using the network management unit;
and judging whether the optical fiber line of the optical module to be detected has a fault or not by using the fault judgment unit according to the transmitting optical power and the receiving optical power of the optical module to be detected.
9. The method for detecting faults of optical fiber lines according to claim 8, wherein the judging whether faults exist in the optical fiber lines of the optical module to be tested according to the transmitting optical power and the receiving optical power of the optical module to be tested by using the fault judging unit includes:
substituting the transmitting light power and the receiving light power of the optical module to be tested into a first preset formula by using the fault judgment unit so as to calculate and obtain the loss coefficient of the optical fiber line of the optical module to be tested;
the first preset formula includes:
α represents the loss coefficient of the optical fiber circuit of the optical module to be tested, PoutRepresenting the emitted optical power, P, of the optical module under testinThe receiving optical power of the optical module to be tested is represented, and L represents the total length of an optical fiber circuit of the optical module to be tested;
when the loss coefficient of the optical fiber line of the optical module to be tested is larger than a loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested has a fault, and when the loss coefficient of the optical fiber line of the optical module to be tested is smaller than or equal to the loss coefficient threshold value, judging that the optical fiber line of the optical module to be tested is normal;
or
Calculating an optical fiber loss value of an optical fiber line of the optical module to be detected according to the transmitting optical power and the receiving optical power of the optical module to be detected, judging whether a difference value between the optical fiber loss threshold value and a preset optical fiber loss threshold value is in a preset interval, if so, judging that the optical fiber line of the optical module to be detected is normal, and if not, judging that the optical fiber line of the optical module to be detected has a fault.
10. The method for detecting faults of optical fiber lines according to claim 8, wherein after the determining, by the fault determining unit, whether faults exist in the optical fiber lines of the optical module to be tested according to the transmitting optical power and the receiving optical power of the optical module to be tested, the method further comprises:
and sending alarm information when the optical fiber line of the optical module to be tested has a fault.
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