WO2011144133A2

WO2011144133A2 - A method, device and system for monitoring optical loss in optical network system

Info

Publication number: WO2011144133A2
Application number: PCT/CN2011/075092
Authority: WO
Inventors: 丁平
Original assignee: 华为技术有限公司
Priority date: 2011-06-01
Filing date: 2011-06-01
Publication date: 2011-11-24
Also published as: CN102388548A; WO2011144133A3

Abstract

A monitoring method for an optical network system is disclosed by the embodiment of the present invention. Said method includes: obtaining reception sensitivity of an optical module by adjusting the power of the received optical signal; monitoring the power of the received optical signal, starting the alarm when the power of the received optical signal is higher than the reception sensitivity of the optical module. The present invention also provides a monitoring device for the optical network system and an optical network system, realizes the detection of the reception sensitivity of the optical module exactly and rapidly, and ensures the measure precision of the reception sensitivity, thus effectively avoiding mistaking the link attenuation status between the optical modules.

Description

Method, device and system for monitoring optical loss in optical network system

The present invention relates to the field of communications technologies, and in particular, to a method, device and system for monitoring an optical network system. Background technique

Passive Optical Network (PON) technology is one of the most widely used Fiber To The Home (FTTH) technologies. The existing PON includes a Broadband Passive Optical Network (BPON), a Gigabit-Capable Passive Optical Network (GPON), and an Ethernet Passive Optical Network (EPON). .

The traditional PON system mainly includes: an optical line terminal (OLT), an optical network unit (ONU), and an optical distribution network (ODN), wherein the optical distribution network includes a backbone. Fiber optics, passive optical splitters, and branch fibers. The 0LT and the passive optical splitter are connected by a backbone optical fiber, and the optical splitter realizes point-to-multipoint optical power distribution and is connected to multiple 0NUs through multiple branch fibers. The direction from 0LT to 0NU is called the downlink direction, and the direction from 0NU to 0LT is called the uplink direction.

In an actual use environment, in order to reduce the maintenance cost, the industry generally separates the receiving portion and the transmitting portion of the optical line terminal and the optical network unit into a pluggable module, that is, an optical module. The optical module of the optical line terminal may also have a partial monitoring function, such as an optical power detection function, for the optical line terminal to perform end-to-end link fault monitoring and fault location. Specifically, when the optical power of the optical network unit is P1, the optical module of the optical line terminal can obtain the received optical component from the optical network unit and transmitted through the optical distribution network through its monitoring function. The optical power of the uplink optical signal is P2, and the optical line terminal can calculate the optical loss A = P1 - P2 of the link between the optical line terminal and the optical network unit. Further, the optical line terminal can compare the theoretical standard value of the system optical loss with the optical loss A of the link, determine the attenuation of the link, and determine whether to enter the alarm.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems: Since the optical power measurement accuracy of the existing optical module is limited, the received optical power value P2 of the optical network unit obtained by optical power detection is obtained. There may be a certain deviation from the actual received optical power value, which may cause a large error between the optical loss A calculated by the optical line terminal and the actual optical loss value of the system, resulting in the end-to-end chain of the optical line terminal. The road attenuation condition is misjudged and then enters the alarm state. Summary of the invention

It is an object of embodiments of the present invention to provide a monitoring method, apparatus, and system for an optical network system that can solve the above problems.

To solve the above problem, an embodiment of the present invention provides a method for monitoring an optical network system, where the method includes: obtaining a receiving sensitivity of an optical module by adjusting a power of the received optical signal;

The power of the received optical signal is monitored, and when the power of the received optical signal is greater than the receiving sensitivity of the optical module, an alarm is initiated.

The embodiment of the invention further provides a monitoring device for an optical network system, the device comprising:

An acquiring module, configured to obtain a receiving sensitivity of the optical module by adjusting a power of the received optical signal; and an optical power monitoring module, configured to monitor a power of the received optical signal;

The alarm module is configured to start an alarm when the power of the received optical signal is greater than the receiving sensitivity.

The embodiment of the present invention further provides an optical network system, where the system includes: a receiving device and a transmitting device; the transmitting device is configured to send an optical signal to the receiving device;

The receiving device is configured to receive an optical signal sent by the transmitting device, obtain a receiving sensitivity of the optical module by adjusting a power of the received optical signal, and monitor a power of the received optical signal, where the power of the received optical signal is greater than Describe the receiving sensitivity of the optical module and start the alarm. The monitoring method, device and system for an optical network system provided by the embodiment of the present invention obtain the receiving sensitivity of the optical module by adjusting the power of the received optical signal; monitoring the power of the received optical signal, when the power of the received optical signal The detection sensitivity of the optical module is greater than the receiving sensitivity of the optical module, and the receiving sensitivity of the optical module is accurately and quickly detected, and the measurement accuracy of the receiving sensitivity is ensured, thereby effectively avoiding the error of the link attenuation between the optical modules. Judge. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a flowchart of a method for monitoring an optical network system according to an embodiment of the present invention;

2 is a flowchart of a specific method for monitoring an optical network system according to an embodiment of the present invention; 3 is a diagram showing a relationship between a bias voltage and a receiving sensitivity of an APD according to an embodiment of the present invention; FIG. 4 is a structural diagram of a monitoring apparatus for an optical network system according to an embodiment of the present invention;

FIG. 5 is a structural diagram of an example of a monitoring apparatus for an optical network system according to an embodiment of the present disclosure;

FIG. 6 is a structural diagram of an optical network system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of a method for monitoring an optical network system according to an embodiment of the present invention. As shown in FIG. 1, the method of the embodiment of the present invention may include the following steps:

S102. The receiving device obtains the receiving sensitivity of the optical module by adjusting the power of the received optical signal.

Further, the optical network system includes a transmitting device and a receiving device, and for the PON, it may include: 0LT and 0NU. In the downlink direction, when 0LT transmits an optical signal to each ONU, the 0LT is a transmitting device, and each ONU is a receiving device; and when any one of the ONUs transmits an optical signal to the OLT in the uplink direction, the ONU is a transmitting device. The 0LT is a receiving device, so the method mainly performs the following methods on the receiving device. For the downstream direction, the receiving device is 0NU, and for the upstream direction, the receiving device is 0LT. The optical module is located in the receiving device.

Further, the obtaining the receiving sensitivity of the optical module by adjusting the power of the received optical signal specifically includes: after performing photoelectric conversion on the received optical signal, adjusting a bias voltage of the converted electrical signal, and The link between the optical modules is error-monitored;

When the error of the optical link reaches a threshold, acquiring a bias voltage of the current electrical signal;

Acquiring the receiving sensitivity of the optical module according to the offset voltage of the electrical signal, and determining the receiving sensitivity of the optical module as the worst receiving of the optical module Sensitivity.

Specifically, the receiving device may include: a central processing unit (CPU), a bit error monitoring module, and an optical module. The optical module further includes: a sending module and a receiving module, where the receiving module includes at least: micro processing Microprocessor control unit (MCU), photodiode (Avalanche photodiode, APD) regulator, and APD. The process of obtaining the receiving sensitivity of the optical module is as follows:

The CPU controls the MCU through the II C bus interface, thereby controlling the APD regulator, so that the APD regulator adjusts the bias voltage of the APD and simultaneously monitors the error on the link; gradually fine-tuning the bias voltage of the APD, for example, The bias voltage of the APD is adjusted downwards, causing a small number of errors on the link until the error on the link reaches the threshold, recording the current bias voltage value, and immediately returning to the normal working state; According to the correspondence between the bias voltage and the receiving sensitivity, the receiving sensitivity corresponding to the current bias voltage value is obtained, and the sensitivity is used as the worst receiving sensitivity of the optical module. Generally, the worst receiving sensitivity actually obtained is 1 to 2 dB higher than the theoretical standard value of the worst receiving sensitivity of the optical module, and some may even be better, so it is necessary to monitor and acquire the actual receiving sensitivity of the optical module, and then The actual link loss of the link is more accurately known, and the loss of the link is monitored in real time and accurately.

S104. The receiving device monitors a power of the optical signal received by the optical module, and when the received optical signal has a power greater than the receiving sensitivity, an alarm is initiated.

Further, after receiving the optical signal, the optical module in the receiving device starts the alarm when the power of the received optical signal is greater than the worst receiving sensitivity of the optical module.

Further, when the power of the received optical signal is less than or equal to the worst receiving sensitivity of the optical module, the received optical signal is parsed.

The method may further include:

The budget margin of the link between the optical modules is obtained by calculating the difference between the power value of the optical signal actually received by the optical module and the receiving sensitivity of the optical module. The monitoring method of the optical network system provided by the embodiment of the present invention obtains the receiving sensitivity of the optical module by adjusting the power of the received optical signal; and monitors the power of the received optical signal, when the power of the received optical signal is greater than the light The receiving sensitivity of the module and the activation of the alarm enable accurate and rapid detection of the receiving sensitivity of the optical module, ensuring the measurement accuracy of the receiving sensitivity, thereby effectively avoiding misjudgment of the link attenuation between the optical modules.

FIG. 2 is a flowchart of a specific method for monitoring an optical network system according to an embodiment of the present invention. The monitoring method of the optical network system specifically includes:

The optical network system includes: a transmitting device and a receiving device, where the transmitting device includes: a first optical module; and the receiving device includes: a second optical module.

S202. The transmitting device sends an optical signal to the receiving device.

The optical network system is P0N. For the downlink direction, that is, 0LT sends an optical signal to each 0NU, 0LT is a transmitting device, and 0NU is a receiving device. For the uplink direction, that is, each ONU transmits an optical signal to 0LT, 0NU is a transmitting device. , 0LT is Receiving device. In addition, the structure of the ONU is similar to that of an optical network terminal (OTT). Therefore, in the solution provided by this application, the steps performed by the optical network unit are also applicable to the optical network terminal.

S204. The receiving device receives the optical signal, performs photoelectric conversion, adjusts a bias voltage of the converted electrical signal, and performs error monitoring on the optical link.

Specifically, the receiving device includes at least: a CPU, a error monitoring module, a second optical module, and a media access controller (Media

Access Controller, MAC), the second optical module includes at least: a receiving module, the receiving module at least: an MCU, an APD, and an amplifier, where the amplifier may include a Transimpedance Amplifier (TIA) and/or a limit Amplifier Amplifier (LA), which can amplify the electrical signal provided by the photodiode to form a digital signal of equal amplitude and provide the data to the MAC for data analysis and the like.

The CPU controls the MCU in the second optical module through the II C bus interface, so that the MCU adjusts the bias voltage of the APD through the APD regulator. Specifically, the APD bias voltage adjustment control register Register APD can be set in the second optical module. — Bias, at the same time, the error monitoring module is used to monitor the error of the link between the first optical module and the second optical module.

S206. The receiving device gradually steps down the APD bias voltage of the second optical module until the error on the current link reaches the threshold value, records the current APD bias voltage, and immediately restores the bias voltage of the APD before the adjustment, so that the service returns to normal. .

The CPU controls the MCU in the second optical module to gradually adjust the APD bias voltage through the II C bus interface until the error on the current link reaches the threshold (for example, 10E-10), records the current APD bias voltage, and immediately recovers to Adjust the bias voltage of the front APD to return the service to normal.

S208. The receiving device obtains a receiving sensitivity corresponding to a current APD offset voltage according to a correspondence between a current APD bias voltage and a receiving sensitivity, and uses the receiving sensitivity as a worst receiving sensitivity of the optical module.

The corresponding relationship between the APD bias voltage and the receiving sensitivity is shown in Fig. 3. Fig. 3 is a graph showing the relationship between the APD bias voltage and the receiving sensitivity.

The X axis of the abscissa in Fig. 3 is the voltage (unit: volt (V)), which indicates the change of the bias voltage of the APD; the y axis of the ordinate is the receiving sensitivity (unit: dBm), as can be seen from Fig. 3, The higher the setting voltage, the better the receiving sensitivity. For example, in the case of a bias voltage of 26V, the sensitivity is -31dBm _; in the case of 45V bias, the sensitivity is -36. 5dBm.

The receiving device can obtain the receiving sensitivity corresponding to the current APD bias voltage according to the correspondence between the current APD bias voltage and the receiving sensitivity, and use the receiving sensitivity as the worst receiving sensitivity of the optical module.

For example, when the APD voltage is adjusted from 40V to 45V, the error on the current link reaches the threshold. According to the correspondence in Figure 3, the worst receiving sensitivity of the current optical module should be -36dBm.

S210. The receiving device monitors a power of the optical signal received by the second optical module, according to the worst receiving sensitivity, Determining that when the power of the received optical signal is greater than the worst receiving sensitivity, an alarm process is performed. Further, when the power of the received optical signal is less than or equal to the worst receiving sensitivity, the optical signal is continuously received, and the optical signal is parsed.

Further, the receiving device can monitor the power of the optical signal received by the second optical module, and calculate the offset voltage difference of the APD before and after the adjustment AV=(V2-V1) Κ (Κ is the coefficient of each reduction, for example, Κ=0. 1 means that each time the 0. lv, VI is the bias voltage value of the APD during normal operation, and V2 is the bias voltage value of the APD when the error generated by the link is equal to the threshold value, according to the voltage difference, the MX can also be passed. AV, obtain the budget margin of the link, where Μ is the linear relationship coefficient between voltage and receiving sensitivity, which means that the link can also accept optical signals.

In addition, the optical module information table may be stored and maintained in the second optical module, where the optical module information table stores information of some optical modules, such as: an alarm threshold, such as an error threshold, etc. In the information, there is a 119-127 address for the reserved information segment, and the reservation information is stored in the APD bias voltage information entry, so that the MCU according to the APD bias voltage information entry in the table The APD voltage is controlled and regulated.

For example, in the GP0N system, the worst receiving sensitivity of the optical module is generally -28dBm, and the optical power received by the current optical module is -31. 8dBm. If compared with the theoretical value of the worst receiving sensitivity of the optical module, The alarm is generated: However, after the photoelectric signal is photoelectrically converted by the above method, the bias voltage of the APD can be known to be 29V, the bias voltage is gradually adjusted, and the error generated on the link is monitored, when the bias voltage is After the 29V is gradually adjusted to 30V, it is detected that the error generated on the link reaches the threshold. According to the corresponding relationship (Fig. 3), it can be known that the receiving sensitivity corresponding to 30V is -3L 8dBm. The differential receiving sensitivity is -31. 8dBm, which is 3. 8dBm higher than the theoretical value. Of course, this is only an example. In practical applications, it may be l-2dBm higher than the theoretical value. Therefore, even if the theoretically specified optical module has a worst receiving sensitivity of -28 dBm, the currently received optical power is -31. 6 dBm. Relative to the theoretical value, an alarm is generated according to the prior art, but due to the actuality of the optical module The worst receiving sensitivity is -31. 8dBm. Compared with the actual worst receiving sensitivity, it is less than the worst receiving sensitivity. Therefore, no alarm is required, so the optical module can still receive the optical signal and parse the optical signal.

In addition, from the above example, it can also be known that the linear relationship between the APD bias voltage and the receiving sensitivity is M = 0.2 (in dBm/v), and AV = 30V-29V = IV. The remaining amount is 1V X 0. 2 = 0. 2dBm, which means that the optical signal of 0. 2dBm is allowed to pass on the current link.至6. 6- The actual worst-case receiving sensitivity of the optical module is -31. 6- 0. 2 = -31. 8dBm.

After adjusting the bias voltage of the APD in the optical module to know the actual receiving sensitivity of the optical module, you can compare the power of the optical signal received by the current optical module with the actual receiving sensitivity to monitor the actual link budget. The monitoring method of the optical network system provided by the embodiment of the present invention obtains the receiving sensitivity of the optical module by adjusting the power of the received optical signal; and monitors the power of the received optical signal, when the power of the received optical signal is greater than the light The receiving sensitivity of the module and the activation of the alarm enable accurate and rapid detection of the receiving sensitivity of the optical module, ensuring the measurement accuracy of the receiving sensitivity, thereby effectively avoiding misjudgment of the link attenuation between the optical modules.

As shown in FIG. 4, FIG. 4 is a structural diagram of a monitoring apparatus for an optical network system according to an embodiment of the present invention. The monitoring apparatus includes: an obtaining module 402, configured to obtain an optical module by adjusting power of a received optical signal. Receiving sensitivity; an optical power monitoring module 404, configured to monitor the power of the received optical signal;

The alarm module 406 is configured to start an alarm when the power of the received optical signal is greater than the receiving sensitivity.

The monitoring device further includes:

The link budget margin acquisition module 408 is configured to obtain a budget margin of a link between the optical modules according to the received optical signal and the receiving sensitivity of the optical module.

The obtaining module 404 specifically includes:

The adjusting module 4042 is configured to: after performing photoelectric conversion on the received optical signal, adjusting a bias voltage of the converted electrical signal;

The error monitoring module 4044 is configured to perform error monitoring on the link between the optical modules.

The bias voltage obtaining module 4046 is configured to: when the error of the optical link reaches a threshold, acquire a bias voltage of the current electrical signal;

a receiving sensitivity obtaining module 4048, configured to acquire a receiving sensitivity of the optical module according to a bias voltage of the electrical signal, and a receiving sensitivity of the obtained optical module, and The worst receiving sensitivity of the optical module. The alarm module is further configured to receive an optical signal and monitor the power of the received optical signal. When the power of the received optical signal is greater than a worst receiving sensitivity of the optical module, an alarm is initiated.

As shown in FIG. 5, FIG. 5 is a structural diagram of an example of a monitoring apparatus for an optical network system according to an embodiment of the present invention. In practical applications, the monitoring device can be applied to the 0LT or to the ONU. Specifically, for the uplink direction, that is, the direction from 0NU to 0LT, the monitoring device can be applied to the 0LT, specifically by adding error detection in the 0LT. The module, and the photodiode regulator implement the above monitoring method, wherein the photodiode is located in the receiving module of the 0LT; for the downstream direction, that is, the direction from 0LT to 0NU, the monitoring device can be applied to the ONU, The above monitoring method is implemented by adding an error monitoring module to the ONU, and the photodiode regulator is located in the receiving module of the ONU.

The following line direction is taken as an example for the description of the 0LT. The 0LT structure is as follows. The 0LT50 includes at least: a central processing unit (CPU) 502, a media access controller (MAC) 512, and error monitoring. An error detection unit 514, and a receiving module 500. The receiving module 500 includes at least: a microprocessor control unit (MCU) 504, an Avalanche photodiode (APD) regulator 506, and a photodiode. (Avalanche photodiode, APD) 508, and amplifier 510, the specific connection relationship is as follows:

a central processing unit (CPU) 502, configured to control a microprocessor control unit (MCU) 504 through an II C bus interface;

The MCU 504 is configured to instruct an Avalanche photodiode (APD) regulator 506 to adjust the bias voltage of the APD 508 according to an instruction of the CPU 502.

The APD508 is configured to adjust the bias voltage value of the received optical signal according to the indication of the APD regulator after performing spot conversion on the received optical signal;

The amplifier 510 may include a Transimpedance Amplifier (TIA) and/or a Limiting Amplifier (LA), which may amplify the electrical signal provided by the APD to form a constant amplitude digital signal and Provided to the media access controller (MAC) 512 of the monitoring device for processing;

An error detection module 514 has one end connected to the CPU and the other end connected to the MAC for monitoring the error generated on the optical link. When the error on the link reaches the threshold, an alarm is generated.

A Media Access Control (MAC) 512 is used to analyze the amplified digital signal of the amplifier.

The OLT may further include a transmitting module, where the sending module includes: a Laser Diode Device (LDD) 516, a laser (Laser Diode, LD) 518, the LDD receives the downlink data, and drives the LD to The downlink data is converted into an optical signal (ie, a downlink optical signal) and sent to the optical network unit. Since the transmitting module is for downstream data, there are no improvements and will not be discussed in detail.

The process of adjusting the APD bias voltage in the 0LT is as follows:

After the ONU sends the uplink data to the 0LT, the receiving module of the SP0LT receives the optical signal, converts the optical signal into an electrical signal through the photoelectric conversion of the APD 508, and amplifies the converted electrical signal through the amplifier 510 to form a constant amplitude. The digital signal is provided to the MAC 512 for parsing processing. At this time, the CPU 502 controls the MCU 504 through the II C bus interface. Instructing the APD regulator 506 to adjust the converted electrical signal, and by gradually reducing the bias voltage of the APD 508, while monitoring the error condition on the link through the error monitoring module 514 until the error generated on the link When the threshold value is reached, the bias voltage value of the current APD 508 is recorded, and the receiving sensitivity corresponding to the voltage value is obtained according to the correspondence relationship between the APD bias voltage and the receiving sensitivity, and the receiving sensitivity is taken as the worst receiving sensitivity. An alarm is generated when the power of the optical signal received by the receiving module is greater than or equal to the worst receiving sensitivity. The monitoring device of the optical network system provided by the embodiment of the present invention obtains the receiving sensitivity of the optical module by adjusting the power of the received optical signal; and monitors the power of the received optical signal, when the power of the received optical signal is greater than the light The receiving sensitivity of the module and the activation of the alarm enable accurate and rapid detection of the receiving sensitivity of the optical module, ensuring the measurement accuracy of the receiving sensitivity, thereby effectively avoiding misjudgment of the link attenuation between the optical modules.

The embodiment of the present invention further provides an optical network system, where the optical network system includes: a sending device and a receiving device, where the transmitting device is configured to send an optical signal to the receiving device;

The receiving device is configured to receive an optical signal sent by the transmitting device, obtain a receiving sensitivity of the optical module by adjusting a power of the received optical signal, and monitor a power of the received optical signal, where the power of the received optical signal is greater than Describe the receiving sensitivity of the optical module and start the alarm.

The receiving device is specifically configured to: after photoelectrically converting the received optical signal, adjust a bias voltage of the converted electrical signal, and perform error monitoring on a link between the optical modules; The error of the optical link reaches the threshold value, and the bias voltage of the current electrical signal is obtained. According to the bias voltage of the electrical signal, the optical module receives the corresponding relationship between the bias voltage and the receiving sensitivity. Sensitivity, and the receiving sensitivity of the acquired optical module is taken as the worst receiving sensitivity of the optical module.

The receiving device is further configured to: receive an optical signal, and monitor power of the received optical signal; and initiate an alarm when a power of the received optical signal is greater than a worst receiving sensitivity of the optical module.

The receiving device is further configured to obtain a budget margin of a link between the optical modules according to a power of the optical signal received by the optical module and a receiving sensitivity of the optical module. A schematic structural diagram of a P0N to which the embodiment of the present invention can be applied. Taking P0N as an example, as shown in FIG. 6, the P0N system 600 includes at least one optical line terminal 610, a plurality of optical network units 620, and an optical distribution network 630. The optical line terminal 610 is coupled to the plurality of optical network units 120 in a point-to-multipoint manner through the optical distribution network 130. The direction from the optical line terminal 610 to the optical network unit 620 is defined as a downlink direction, and the direction from the optical network unit 620 to the optical line terminal 610 is an uplink direction.

The optical line termination 610 is typically located at a central location (eg, Central Office, CO), which can be The plurality of optical network units 620 are managed, and data is transmitted between the optical network unit 620 and an upper layer network (not shown). Specifically, the optical line terminal 610 can serve as a medium between the optical network unit 620 and the upper layer network, and forward data received from the upper layer network to the optical network unit 620, and The data received by the optical network unit 620 is forwarded to the upper layer network.

For the uplink direction, the optical line terminal 610 may include: a CPU, a MAC, an error monitoring module, and an optical module, where the optical module includes: a sending module and a receiving module, where the receiving module includes at least: an MCU, an APD regulator, APD and amplifiers. After receiving the optical signal, the receiving module of the 0LT converts the optical signal into an electrical signal through photoelectric conversion of the APD, and amplifies the converted electrical signal through an amplifier to form a digital signal of equal amplitude and provides the MAC for analysis processing. At this time, the CPU controls the MCU through the II C bus interface, instructs the APD regulator to adjust the converted electrical signal, and can gradually reduce the APD bias voltage by gradually reducing the error on the link through the error monitoring module. In the case of the code, until the error generated on the link reaches the threshold value, the current APD bias voltage value is recorded, and according to the corresponding relationship between the APD bias voltage and the receiving sensitivity, the receiving sensitivity corresponding to the voltage value is obtained, and the Receive sensitivity is used as the worst reception sensitivity. An alarm is generated when the power of the optical signal received by the receiving module is greater than or equal to the worst receiving sensitivity. For the downlink direction, the OLT sends an optical signal to each ONU, and each of the ONUs may include: a CPU, a MAC error monitoring module, and an optical module, where the optical module includes: a sending module and a receiving module, where the receiving module includes at least: an MCU, APD regulator, APD, amplifier, etc. After receiving the optical signal, the receiving unit of the 0NU converts the optical signal into an electrical signal through photoelectric conversion of the APD, and amplifies the converted electrical signal through an amplifier to form a digital signal of equal amplitude and provides the MAC for analysis processing. At this time, the CPU controls the MCU through the II C bus interface, instructs the APD regulator to adjust the converted electrical signal, and can gradually reduce the APD bias voltage by gradually reducing the error on the link through the error monitoring module. In the case of the code, until the error generated on the link reaches the threshold value, the current APD bias voltage value is recorded, and according to the corresponding relationship between the APD bias voltage and the receiving sensitivity, the receiving sensitivity corresponding to the voltage value is obtained, and the Receive sensitivity is used as the worst reception sensitivity. An alarm is generated when the power of the optical signal received by the receiving module is greater than or equal to the worst receiving sensitivity. The optical distribution network 630 can be a data distribution system that can include optical fibers, optical couplers, optical splitters, and/or other devices. In one embodiment, the optical fiber, optical coupler, optical splitter, and/or other device may be a passive optical device, in particular, the optical fiber, optical coupler, optical splitter, and/or other The device may be a device that distributes data signals between the optical line terminal 610 and the optical network unit 620 without the need for power support. Additionally, in other embodiments, the optical distribution network 630 may also include one or more processing devices, such as optical amplifiers or Relay device. In the branching structure shown in FIG. 1, the optical distribution network 630 may specifically extend from the optical line terminal 610 to the plurality of optical network units 620, but may also be configured in any other point-to-multipoint structure. .

The optical network system provided by the embodiment of the present invention obtains the receiving sensitivity of the optical module by adjusting the power of the received optical signal; monitors the power of the received optical signal, and the power of the received optical signal is greater than the receiving of the optical module. Sensitivity, start alarm, realizes accurate and fast detection of the receiving sensitivity of the optical module, ensures the measurement accuracy of the receiving sensitivity, and thus effectively avoids misjudging the link attenuation between the optical modules.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The steps of the foregoing method embodiments are included; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A method for monitoring an optical network system, the method comprising:

Obtaining the receiving sensitivity of the optical module by adjusting the power of the received optical signal;

The monitoring method according to claim 1, wherein the obtaining the receiving sensitivity of the optical module by adjusting the power of the received optical signal comprises:

After photoelectrically converting the received optical signal, adjusting a bias voltage of the converted electrical signal, and performing error monitoring on the link between the optical modules;

The monitoring method according to claim 2, wherein the monitoring of the received optical signal power, when the power of the received optical signal is greater than the receiving sensitivity, the starting alarm specifically includes:

Receiving an optical signal and monitoring the power of the received optical signal;

When the power of the received optical signal is greater than the worst receiving sensitivity of the optical module, an alarm is initiated.

The monitoring method according to claim 1 or 2, wherein the method further comprises:

Obtaining a budget margin of the link between the optical modules according to the received optical signal and the receiving sensitivity of the optical module.

5. A monitoring device for an optical network system, the device comprising:

The monitoring device according to claim 5, wherein the acquiring module specifically includes: an adjusting module, configured to perform photoelectric conversion on the received optical signal, and adjust a bias of the converted electrical signal Set voltage

The error monitoring module is configured to perform error monitoring on the link between the optical modules;

a bias voltage acquisition module, configured to: when the error of the optical link reaches a threshold, acquire a bias of the current electrical signal Set voltage

a receiving sensitivity obtaining module, configured to acquire, according to a bias voltage of the electrical signal, a receiving sensitivity of the optical module by using a correspondence between a bias voltage and a receiving sensitivity, and use the received sensitivity of the obtained optical module as a The worst receiving sensitivity of the optical module.

The monitoring device according to claim 6, wherein the alarm module is further configured to receive an optical signal and monitor power of the received optical signal; when the received optical signal has a power greater than the The worst receiving sensitivity of the optical module, and the alarm is activated.

The monitoring device according to claim 5 or 6, wherein the monitoring device further comprises: a link budget margin acquisition module, configured to: according to the received optical signal power and the receiving sensitivity of the optical module , Get the budget margin of the link between optical modules.

An optical network system, the system comprising: a receiving device and a transmitting device; the transmitting device, configured to send an optical signal to the receiving device;

The optical network system according to claim 9, wherein the receiving device is configured to: after photoelectrically converting the received optical signal, adjust a bias voltage of the converted electrical signal, And performing error detection on the link between the optical modules; when the error of the optical link reaches a threshold, acquiring a bias voltage of the current electrical signal; and according to the bias voltage of the electrical signal, And a receiving sensitivity of the optical module is obtained as a worst receiving sensitivity of the optical module.

The optical network system according to claim 9 or 10, wherein the receiving device is further configured to: receive an optical signal, and monitor power of the received optical signal; when the received optical signal The power is greater than the worst receiving sensitivity of the optical module, and the alarm is activated.

The optical network system according to claim 9 or 10, wherein the receiving device is further configured to acquire a chain between the optical modules according to the received power of the optical signal and the receiving sensitivity of the optical module. The budget margin of the road.