CN111970049B

CN111970049B - Optical power detection method and device

Info

Publication number: CN111970049B
Application number: CN201910420815.8A
Authority: CN
Inventors: 冯义; 郑刚
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2022-05-13
Anticipated expiration: 2039-05-20
Also published as: CN111970049A

Abstract

The application discloses a method and a device for detecting optical power, which are used for solving the problem of low accuracy rate of judging whether the optical power of a standby port meets the requirement of optical power budget by judging whether an SD signal exists or not. By determining the maximum received optical power and the minimum received optical power at the active port, and when the standby port and the link normally transmit optical signals, and the maximum received optical power and the minimum received optical power on the standby port do not meet the preconfigured conditions, the standby port does not meet the requirements of the optical power budget.

Description

Optical power detection method and device

Technical Field

The present application relates to the field of optical communication technologies, and in particular, to a method and an apparatus for detecting optical power.

Background

In a typical Passive Optical Network (PON) Type B protected network, two PON ports in an Optical Line Terminal (OLT) are added into one protection group, so as to protect the PON port of the Optical Line Terminal (OLT) and a main optical fiber, and when a failure occurs in one of the OLT PON ports or the main optical fiber, the PON port can be automatically switched to another OLT PON port or main optical fiber. One of two PON ports in the protection group is used as a working port, and the other PON port is used as a protection port. Under the normal working state, the working port bears the service, and when the link where the working port is located fails, the system automatically switches the service of the working port to the protection port, so that the normal transmission of the service is ensured. There are two types of states for the protection group members: an active state (active) and an alternative state (standby). The port with the state of active forwards data, and the port with the state of standby does not forward data.

In order to perform normal service switching between two ports, it is necessary to ensure that the optical power budgets of the active port and the standby port of the TypeB protection group meet the requirements of the GPON optical power budget.

Because an Optical Network Unit (ONU) is only on the active port, the standby port only receives an uplink optical signal and does not transmit a downlink optical signal, and the optical power of the standby port cannot be accurately measured when the standby port does not emit a light signal.

Conventionally, whether an optical signal exists in a standby port is determined by regularly checking whether the standby port has an sd (signal detect), so as to determine whether the optical power of the standby port meets the requirement of a GPON optical power budget. The optical path can be judged to be light by the SD signal when the light intensity is more than-35 dbm, and the GPON optical budget usually requires that the light intensity received by the OLT is between-28 dbm and-8 dbm, so that the accuracy of judging whether the optical power of the optical path of the standby port meets the GPON optical budget requirement or not by judging whether the SD signal exists or not is low, and further, the optical power budget requirement cannot be met after part of the ONU switches services, so that the switching failure and the service interruption are caused.

Disclosure of Invention

The embodiment of the application provides a method and a device for detecting optical power, which are used for solving the problem that the accuracy rate is low when whether the optical power of a standby port optical path meets the GPON optical budget requirement is judged by judging whether an SD signal exists or not.

The embodiment of the application provides a method for detecting optical power, which comprises the following steps: the OLT detects at least one of a first maximum receiving optical power and a first minimum receiving optical power in the receiving optical power of an optical signal received by a first optical module installed on a first port within a first preset time, wherein the first port is in a non-working state; the OLT determines that at least one of a first condition, a second condition or a third condition is met, and outputs alarm information, wherein the alarm information is used for indicating that the optical power of the first port does not meet the requirement of an optical power budget; wherein the first condition is that the first maximum received optical power is smaller than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, the third condition is that the first minimum received optical power is smaller than a third threshold, and the second threshold is greater than the first threshold.

When the first port is in a non-working state, the first port can receive the optical signal but does not transmit the optical signal. The inactive state may also be referred to as a standby state, or as a standby state. The first port may also be referred to as a standby port.

Illustratively, the first threshold, the second threshold, and the third threshold are each related to an optical power budget. Since the optical signal can be received at the standby port, the embodiment of the present application determines whether the optical power of the standby port meets the requirement of the optical power budget by detecting at least one of the maximum received optical power and the minimum received optical power of the standby port. And then the accuracy of judgment is improved, and further the problem that the switching failure and service interruption are caused because part of ONU cannot meet the optical power budget requirement after switching services is avoided to a certain extent.

In one possible design, the method may further include: the OLT detects a second maximum receiving optical power and a second minimum receiving optical power in receiving optical power of optical signals received by a second optical module installed on a second port within a second preset time, the second port is in a working state, and the received optical signals are from a plurality of Optical Network Units (ONU); wherein the first threshold is associated with a first difference value, and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power.

When the second port is in a working state, the second port can receive an optical signal and can also transmit an optical signal. The active state may also be referred to as the active state or as the active state. The second port may also be referred to as an active port.

In this design, by determining the maximum received optical power and the minimum received optical power at the active port, it can be inferred that the maximum received optical power and the minimum received optical power at the standby port should be different from those of the active port in a case where the links corresponding to the standby port and the standby port normally transmit optical signals. Therefore, the first threshold is determined by the difference between the maximum received optical power and the minimum received optical power of the active port, and further determined according to the relationship between the maximum received optical power and the first threshold of the standby port, whether the individual optical signal of the standby port is too low or not is determined, the requirement of optical power budget is not met, and the accuracy of determination can be improved.

Illustratively, the second threshold is less than or equal to a maximum value of a reception sensitivity of the first optical module optical power. Illustratively, the third threshold is greater than or equal to a minimum value of the receiving sensitivity of the optical power of the first optical module.

In one possible design, the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods; the time length of N detection periods is less than or equal to the first preset time length, optical signals of M time point positions are collected in each detection period, the time point positions of the collected optical signals in any two adjacent detection periods are different, N is an integer larger than 1, and M is an integer larger than 1.

In the above design, the time points of the collected optical signals in any two adjacent detection periods are different, that is, the optical signals are not collected at fixed time points in each detection period, so as to obtain the received optical power of the collected optical signals.

In one possible design, the M is related to a minimum sampling interval supported by the OLT.

In one possible design, before the OLT detects at least one of a first maximum received optical power and a first minimum received optical power of a received optical signal within a first preset time period, the OLT further includes:

the OLT allocates, to the first ONU, a second light-emitting time slot that is not occupied by the ONUs on the second port, except for a first light-emitting time slot currently occupied by the first ONU, so that the first ONU transmits an optical signal to the OLT in the first light-emitting time slot and the second light-emitting time slot, where the first ONU is an ONU corresponding to a second maximum received optical power among the ONUs.

In the design, the residual bandwidth of the active port is allocated to the ONU corresponding to the maximum receiving optical power of the on-line active port as much as possible, the allocated bandwidth ratio of the ONU which sends out the optical signal with the maximum receiving optical power is increased, and the probability that the sampling point hits the maximum receiving optical power is further improved.

Based on the same inventive concept as the first aspect, in a second aspect, an embodiment of the present application provides an optical power detection apparatus, where the apparatus is applied to an optical line terminal OLT, and the apparatus includes:

the first detection module is used for detecting at least one of a first maximum receiving optical power and a first minimum receiving optical power in the receiving optical power of an optical signal received by a first optical module installed on a first port within a first preset time period, wherein the first port is in a non-working state;

the processing module is used for determining that at least one of a first condition, a second condition or a third condition is met, and outputting alarm information, wherein the alarm information is used for indicating that the optical power of the first port does not meet the requirement of an optical power budget;

wherein the first condition is that the first maximum received optical power is smaller than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, the third condition is that the first minimum received optical power is smaller than a third threshold, and the second threshold is greater than the first threshold.

In one possible design, the apparatus further includes:

the second detection module is configured to detect a second maximum received optical power and a second minimum received optical power in received optical powers of optical signals received by a second optical module installed on a second port within a second preset time period, where the second port is in a working state, and the received optical signals are from a plurality of optical network units ONU;

wherein the first threshold is associated with a first difference value, and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power.

In one possible design, the second threshold is less than or equal to a maximum value of the reception sensitivity of the optical power of the first optical module.

In one possible design, the third threshold is greater than or equal to a minimum value of the reception sensitivity of the optical power of the first optical module.

In one possible design, the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods;

the time length of N detection periods is less than or equal to the first preset time length, optical signals of M time point positions are collected in each detection period, the time point positions of the collected optical signals in any two adjacent detection periods are different, N is an integer larger than 1, and M is an integer larger than 1.

In one possible design, further comprising:

the first ONU is configured to send the optical signal to the OLT in the first light-emitting timeslot and the second light-emitting timeslot, where the first ONU is not occupied by the ONUs, and the first ONU is an ONU corresponding to the first maximum received optical power among the ONUs.

In a third aspect, an embodiment of the present application further provides an apparatus, which may be an OLT, configured to implement the method described in the first aspect; the apparatus may also be other apparatuses capable of supporting the OLT to implement the method described in the first aspect, for example, an apparatus that may be disposed in the OLT. The OLT may be a chip system, a module, a circuit, or the like provided therein, which is not particularly limited in this application. The apparatus comprises a processor configured to implement the function of the OLT in the method described in the first aspect. The apparatus may also include a memory for storing program instructions and data. The memory is coupled to the processor, and the processor invokes and executes the program instructions stored in the memory, so as to implement the function of the OLT in the method described in the first aspect. The apparatus may also include a communication interface for the apparatus to communicate with other devices. Illustratively, the other device is an ONU. In the embodiments of the present application, the communication interface may include a circuit, a bus, an interface, a communication interface, or any other device capable of implementing a communication function.

In a fourth aspect, this embodiment of the present application further provides a computer storage medium, where a software program is stored, and the software program can implement the method according to the first aspect or any design of the first aspect when being read and executed by one or more processors.

In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any design of the first aspect.

In a sixth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement a function of the OLT in the foregoing method. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In a seventh aspect, an embodiment of the present application provides a system, where the system includes an OLT and multiple ONUs. The ONU is configured to send an optical signal to the OLT, and the OLT is configured to receive the optical signal and perform the method according to the first aspect or any design of the first aspect based on the optical signal.

Drawings

Fig. 1 is a schematic diagram of an optical communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a type B protection single-homing networking structure provided in an embodiment of the present application;

fig. 3 is a flowchart of a method for detecting optical power according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of optical powers received by different ONUs in a DBA period according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of detecting point translation in different detection periods according to the embodiment of the present application;

fig. 6 is a schematic diagram of bandwidth allocation provided in an embodiment of the present application;

fig. 7 is a flowchart of another optical power detection method provided in the present embodiment;

fig. 8 is a schematic diagram of another bandwidth allocation provided in the embodiment of the present application;

FIG. 9 is a schematic structural diagram of an apparatus 900 according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an OLT1000 according to an embodiment of the present application.

Detailed Description

It should be appreciated that reference throughout this specification to "one embodiment," "an implementation," "one embodiment," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment," "in one implementation," "in one embodiment," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information. And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. Furthermore, the terms "comprising" and "having" in the description of the embodiments and claims of the present application and the drawings are not intended to be exclusive. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules listed, but may include other steps or modules not listed.

The embodiment of the application can be applied to an optical communication system, and the optical communication system can be a PON system. The PON system may be a gigabit-capable PON (GPON) system, an ethernet passive optical network (ethernet PON, EPON) system, a decagigabit ethernet passive optical network (10Gb/s ethernet passive optical network, 10G-EPON) system, a time and wavelength division multiplexing passive optical network (time and wavelength division multiplexing passive optical network, TWDM-PON), a decagigabit-capable passive optical network (10gigabit-capable passive optical network, XG-PON) system, or a decagigabit-capable symmetric passive optical network (10-gigabit-capable passive optical network, XGs-PON) system, or the like. The new technology of future evolution will improve the speed of PON to 25Gbps, 50Gbps or even 100Gbps, so the application can also apply the PON system with higher transmission speed.

The optical communication system at least comprises an OLT and a plurality of ONUs, and the OLT is respectively communicated with the plurality of ONUs. The Optical communication system may further include an Optical Distribution Network (ODN), and a plurality of ONUs may be connected to a PON port of the same OLT through the ODN.

Illustratively, other network devices, such as user terminals, servers, mobile base stations, etc., may also be included in the optical communication system. As shown in fig. 1, an optical communication system topology is illustratively described. In the topology shown in fig. 1, the communication devices can be divided into a "user side" and a "network side" according to the communication device connection relationship. For a user terminal terminating a service, such as a Personal Computer (PC), in the network topology shown in fig. 1, there is only the network side; for a communication device terminating part of the service, such as a Dynamic Host Configuration Protocol (DHCP) dial-up server, there may be only a user side. The OLT connects the equipment at the user side with the router equipment at the network side to play the roles of convergence and access, and the OLT can be accessed into various network equipment, such as a PC, a mobile base station, an ONU and the like.

The following explains technical terms related to embodiments of the present application.

1. xPON Type B protection

The xPON Type B protection refers to the protection of double-path redundancy of a PON port and a trunk optical fiber of an OLT in an xPON network. The xPON Type B protection can improve the reliability of the ODN network and ensure that the service is not interrupted.

Referring to fig. 2, a networking structure of xPON Type B protection single homing is illustrated. The Type B protection single home is mainly used for protecting the OLT PON port and the trunk optical fiber, and when the OLT PON port or the trunk optical fiber breaks down, the protection single home can be automatically switched to another OLT PON port or the trunk optical fiber.

2. Protection group

In the scene of xPON Type B protection single attribution, two PON access ports on one OLT are added into one protection group. Two PON access ports on one OLT can be on the same PON plate or on two PON plates. When two PON access ports on one PON board are used to form one protection group, hardware resources can be saved, but when the PON board fails, the entire board service is interrupted. When two PON access ports on two PON boards form a protection group, although the hardware cost is increased compared with that of one PON board, when one of the PON boards (which may be called as an active PON board) fails, a service can be switched to a PON port on the other PON board for service access, which does not cause service interruption.

1) The roles of the protection group members are two types: work (work) and protection (protect).

One protection group includes one work port (i.e., work port) and one protection port (i.e., protect port), and the work port and the protection port are two ports of the access PON, respectively. The working port may also be referred to as the active port and the protection port may also be referred to as the standby port.

Under normal working condition, the working port bears service. When the link where the working port is located has a fault, the system automatically switches the service of the working port to the protection port, and ensures the normal transmission of the service.

2) And protecting the group member state.

There are two types of states for the protection group members: an active state and an inactive state. The active state may also be referred to as an active (active) state, and the inactive state may also be referred to as a standby (standby) state. The port with the state of active forwards data, and the port with the state of standby does not forward data.

It should be understood that under normal operating conditions, the working port is in active state and the protection port is in standby state. When the link where the working port is located fails, the working port is changed from an active state to a standby state, and the protection port is updated from the standby state to the active state.

3) And a switching type.

There are two types of protection group switching: automatic switching due to failure triggering and protection switching performed manually. The manual operations that may cause protection switching include manual switching, forced switching, and locking. The automatic switching means that the OLT and the ONU do not need human intervention to automatically switch the optical links under the condition of satisfying the switching. Manual switching is a way to manually control the switching of the protection groups, for example, by running a manual-switch command on the OLT. Forced switching is considered to be enforced, such as by running a force-switch command on the OLT, so that optical link switching occurs regardless of whether the designated target member is normal or not.

When the active state of the working port is changed into the standby state after the switching occurs, if a locking (lockout) command is operated on the OLT to lock the port of the protection group member, the work port and the protection port can be locked under the single attribution scene of Type B, the protection switching occurs, and the state of the work port is changed from the standby state to the active state.

4) The conditions for switching are as follows: the optical power of the active port and the standby port of the Type B protection group meets the requirement of PON optical power budget.

The Type B protection group is a typical cold backup protection mechanism, and the ONU is only on line at an active port, so that the standby port only receives an uplink optical signal and cannot send a downlink optical signal, and the transmitting optical power of the standby port cannot be accurately measured under the condition that the standby port does not emit a light signal. Conventionally, whether an optical signal exists in a standby port is determined by regularly checking whether the standby port has an sd (signal detect), so as to determine whether the optical power of the standby port meets the requirement of a GPON optical power budget. The optical power of the optical path of the standby port can be judged only when the optical power of the SD signal is more than-35 dbm, and the optical budget of the GPON generally requires that the optical power received by the OLT is between-28 dbm and-8 dbm, so that whether the optical power of the optical path of the standby port meets the requirement of the optical budget of the GPON can not be judged through whether the SD signal exists. After part of ONU switches services, the ONU can not meet the requirement of optical power budget, and the switching fails and the services are interrupted.

Based on this, the embodiments of the present application provide a method and an apparatus for detecting optical power, which are used to improve the accuracy of optical power detection. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

In the embodiment of the present application, an example in which a protection group includes one working port and one protection port is described. It should be understood that the system configuration does not limit the number of working ports and protection ports included in the protection group. The method and the device mainly aim to detect whether the optical power of the protection port meets the optical power budget requirement.

According to the embodiment of the application, whether the optical power of the protection port meets the optical power budget requirement can be determined according to the maximum value and/or the minimum value of the received optical power of the protection port through the detected maximum value and/or the detected minimum value of the received optical power of the protection port. For example, the OLT determines that at least one of a first condition, a second condition, or a third condition is met according to the maximum value and/or the minimum value of the received optical power of the protection port, and determines that the optical power of the protection port does not meet the requirement of the optical power budget.

The first condition is as follows: the first maximum received optical power is less than a first threshold;

and a second condition: the first maximum received optical power is greater than a second threshold;

and (3) carrying out a third condition: the first minimum received optical power is less than a third threshold.

Wherein the second threshold is greater than the first threshold, and the third threshold is less than the first threshold.

As follows, the scheme provided by the embodiment of the present application is described in detail in an exemplary manner from the perspective of the configuration condition one, and the perspective of the configuration conditions two and three, and for other combination manners, reference may be made to the manner of the configuration condition one, the condition two, and the condition three, and details are not repeated.

The above-described implementation by determining whether the first maximum received optical power is less than the first threshold is met is first described in detail below.

Fig. 3 is a schematic flow chart of a method for detecting optical power in the embodiment of the present application.

S301, the OLT detects a first maximum receiving optical power of receiving optical powers of optical signals received by a first optical module installed on a first port within a first preset time, where the first port is in a non-operating state.

When the first port is in a non-working state, the first port can receive the optical signal but does not transmit the optical signal. The inactive state may also be referred to as a standby state, or as a standby state. The first port may also be referred to as a standby port. In the following description, the first port in the non-operating state is referred to as a standby port for example.

S302, when the OLT determines that the first maximum received optical power is smaller than a first threshold (i.e. condition one), the OLT outputs alarm information, where the alarm information is used to indicate that the optical power of the first port does not meet the requirement of the optical power budget.

Illustratively, the alarm information may include at least one of the following:

the identification of the OLT (e.g., chassis number), slot number (each board is plugged into a slot, and an OLT has multiple slots), and port number. Ports that do not meet the optical power budget requirements are indicated by including the information as above in the alarm information.

The first threshold may be determined in a number of ways, two ways of determining the first threshold are illustratively described as follows:

as a first example, the first threshold may be related to a difference between a maximum received optical power and a minimum received optical power of the second port in the operating state.

Based on this, the method may further include:

s303, the OLT detects a second maximum received optical power and a second minimum received optical power in the received optical powers of the optical signals received by the second optical module installed on the second port within a second preset time period; wherein the first threshold is associated with a first difference value, and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power. The second port is in a working state, and the received optical signals come from a plurality of optical network units ONU.

For example, when the second port is in an operating state, the second port may receive an optical signal and may transmit an optical signal. The active state may also be referred to as the active state or as the active state. The second port may also be referred to as an active port.

For example, the first threshold may be equal to the sum of the first difference and the preconfigured threshold. The preconfigured threshold value may be smaller than or equal to a receive sensitivity minimum of the first optical module optical power, e.g. the preconfigured threshold value may be equal to the receive sensitivity minimum of the first optical module optical power.

As a second example, the first threshold may be an empirical value. For example, the empirical value may be obtained through a plurality of experiments.

In one example, different ONUs transmit optical signals in different time slots during a Dynamic Bandwidth Allocation (DBA) period. For convenience of description, the second port in operation is referred to as an active port. When detecting the second maximum received optical power and the second minimum received optical power, the OLT may sequentially perform Received Signal Strength Indication (RSSI) measurement on all the online ONUs under the active port, and record an optical power value of each ONU received by the active port. Taking the maximum value in the record as the second maximum receiving optical power of the Active port; and taking the minimum value in the record as the second minimum received optical power of the active port. For example, referring to fig. 4, the optical communication system includes an OLT and 4 ONUs, and the OLT communicates with the 4 ONUs respectively. The 4 ONUs are ONU1, ONU2, ONU3, and ONU4, respectively. The bandwidth occupied by 4 ONUs may not occupy the entire bandwidth. The OLT detects the maximum value and the minimum value in the received optical power of the optical signals of the ONU1-OTN4 on the active port, wherein the maximum value is the second maximum received optical power, and the minimum value is the second minimum received optical power. In fig. 4, the height of the rectangular box indicates the received optical power of each ONU, and therefore, for fig. 4, the second maximum received optical power is the received optical power of ONU2, and the second minimum received optical power is the received optical power of ONU 3.

As an example, the second preset duration may be configured to be 1 or more DBA cycles, such as the second preset duration being equal to 1 DBA cycle. The duration configured for the second preset duration may be configured as needed, and this is not specifically limited in this application.

It should be understood that the first preset time period and the second preset time period may be equal or unequal.

For example, since the OLT generally does not perform any processing on the optical signal transmitted by the standby port, in the embodiment of the present application, the OLT is configured to receive the optical signal transmitted by the standby port, and may sample the received optical power of the optical signal.

It should be noted that the active port and the standby port in the OLT may be configured on the same board, or may be configured on different boards, and when it is required to determine whether the standby port meets the requirement of the optical power budget, the OLT may start the maximum received optical power detection at the standby port.

In the embodiment of the present application, by determining the maximum received optical power and the minimum received optical power at the active port, it can be inferred that, when the links corresponding to the standby port and the standby port normally transmit optical signals, the maximum received optical power and the minimum received optical power at the standby port should be slightly different from the maximum received optical power and the minimum received optical power at the active port. However, in actual measurement, the accuracy of measuring the minimum received optical power of the standby port is low, and therefore, in the embodiment of the present application, by using the first threshold determined based on optical power prediction as the possible minimum received optical power of the standby port, if the difference between the maximum received optical power (the second maximum received optical power) of the standby port and the first threshold is smaller than the difference between the maximum received optical power and the minimum received optical power of the active port, it is determined that individual optical signals of the standby port are too low, and the requirement of optical power budget is not met.

Illustratively, a standby port does not meet the requirement of optical power budget when the condition shown in the following formula (1) is satisfied:

ROPmaxS < thres + (ROPmaxA-ROPminA); formula (1)

Where ROPmaxS denotes a maximum received optical power of the standby port, and the first threshold is thres + (ROPmaxA-ROPminA). ROPmaxA represents the maximum received optical power of the active port, ROPminA represents the minimum received optical power of the active port, and thres represents the preconfigured threshold.

When the condition shown in the following formula (2) is satisfied, the standby port satisfies the requirement of the optical power budget.

ROPmaxS is more than or equal to thres + (ROPmaxA-ROPminA); equation (2).

In one possible example, in detecting the maximum received optical power of the first optical module on the first port, N detection periods may be configured, each detection period setting M time point positions. The duration of the N detection periods is equal to or less than a first preset duration. It should be understood that the N detection periods may be exactly equal to the first preset time duration, and of course, the N detection periods may also be less than the first preset time duration, for example, the N half periods are equal to the first preset time duration, and may be measured only in the N detection periods, and the remaining half period is not measured, and of course, the remaining half period may also be measured, which is not specifically limited in this application. N is an integer greater than 1 and M is an integer greater than 1. In this example, the maximum received optical power (first maximum received optical power) of the standby port is the maximum received optical power of the optical signal at N × M time points detected in N detection periods; the optical signals at M time points are collected in each detection period, and the time points at which the optical signals are collected in any two adjacent detection periods are different. The time point positions of the collected light signals in any two adjacent detection periods are different, that is, the light signals are not collected at fixed time point positions in each detection period, so as to obtain the received light power of the collected light signals.

For example, one detection period may be equal to one DBA period, or equal to a plurality of DBA periods.

As an example, the maximum received optical power of the standby port may be measured in a "detection point shift" manner. When configuring the time point of acquisition, the starting position of the time point of acquisition of the next detection cycle is a quantitative translation of the starting position of the time point of acquisition of the previous detection cycle. In one detection period, any two time points are the same in interval. For example, referring to fig. 5, two detection periods are taken as an example. The time points at which the light signals are collected in the first detection period are A1-A7. The time points of light signal collection in the second detection period are B1-B7, and the translation amount is X. By adopting different detection periods and different detection points, the probability of acquiring the maximum received optical power by the standby can be improved.

It should be understood that, in the manner that the first threshold value is determined by the first example, the maximum received optical power and the minimum received optical power of the active port may be measured by detecting the point shift.

As another example, a random determination of the detection may be used, such as a random determination of the detection point every detection period. Therefore, the probability of acquiring the maximum received optical power by the standby can be improved by adopting different detection periods and different detection points.

In another possible example, a "dense trigger" approach may be used, that is to say as many detection points per detection cycle as possible. For example, the number of detection points per detection period may be determined according to the minimum sampling interval supported by the OLT, for example, the number of detection points per detection period is equal to the number determined according to the minimum sampling interval supported by the OLT and the duration of the detection period. As another example, the number of detection points per detection period is equal to 3/4, which is determined by the minimum sampling interval supported by the OLT and the duration of the detection period. As another example, the number of detection points per detection period is equal to 1/2, which is determined by the minimum sampling interval supported by the OLT and the duration of the detection period. Illustratively, the sampling interval may range from 125us to 500 us. The minimum sampling interval supported by the OLT is related to the RSSI sampling capability and CPU processing capability of the OLT.

For example, the number of sampling points in different detection periods may also be different, and the application is not limited to this.

It should be understood that, in the manner that the first threshold value is determined by the first example, the maximum received optical power and the minimum received optical power of the active port may also be measured by detecting the point translation intensive trigger.

In another possible example, the uplink traffic of the PON port in a normal case is much smaller than the theoretical bandwidth of the PON port, and the optical power detection directly performed at the standby port has a high probability of missing the true maximum value, so as to reduce the probability of missing the maximum value and improve the probability of hitting the maximum received optical power, the remaining bandwidth of the active port may be allocated to the ONU corresponding to the maximum received optical power of the active port as much as possible, and the allocated bandwidth ratio of the ONU that sends out the optical signal with the maximum received optical power is increased. For example, the first ONU is an ONU corresponding to the second maximum received optical power among the ONUs. For example, before performing detection of a first maximum received optical power of received optical powers of optical signals received by a first optical module installed on a first port within a first preset time period, an OLT may allocate, to the first ONU, a second optical emission time slot that is not occupied by the plurality of ONUs on the active port, except for a first optical emission time slot currently occupied by the first ONU, so that the first ONU transmits the optical signals to the OLT in the first optical emission time slot and the second optical emission time slot. The allocated bandwidth proportion of the ONU sending the optical signal with the maximum receiving optical power is increased in the detection period, so that the probability of detecting the maximum receiving optical power by the standby port is improved. For example, referring to fig. 6, other bandwidths not occupied by the ONUs on the active port are equally distributed to the ONUs 2, before distribution, a sampling point may not hit the maximum received optical power, and other values smaller than the maximum received optical power are taken as the maximum received optical power. After the distribution, the sampling points D2 and D3 hit the maximum receiving optical power, so that the probability that the sampling points hit the maximum receiving optical power can be improved by distributing other bandwidths to the ONU of the maximum receiving optical power of the active port.

It should be noted that the second light-emitting timeslot may be the entire bandwidth on the active port that is not occupied by the ONUs. Or a part of bandwidth on the active port that is not occupied by the plurality of ONUs, which is not specifically limited in this embodiment of the application.

In a possible example, generally, when an optical signal sent by an ONU with the maximum received optical power corresponding to an active port is transmitted through a standby port, the received optical power is likely to be the maximum received optical power. Based on this, when the OLT detects a first maximum received optical power in the received optical powers of the optical signals received on the standby port within a first preset time period, the method may be implemented as follows:

the OLT detects the receiving optical power of the optical signal from the first ONU of the first optical module on the first port within a first preset time as a first maximum receiving optical power. The first ONU is an ONU corresponding to the second maximum receiving optical power in the plurality of ONUs.

Specifically, the OLT detects the receiving optical power of the optical signal from the first ONU at the standby port within the first preset time period, and may detect the receiving optical power of the optical signal at the corresponding light-emitting timeslot of the first ONU. For example, if the first ONU transmits an optical signal in the first light-emitting time slot, the OLT detects the received optical power of the optical signal received from the standby port in the first light-emitting time slot.

For example, after determining the ONU with the maximum received optical power corresponding to the active port, the ONU with the maximum received optical power corresponding to the active port may be allocated with the remaining bandwidth of the active port as much as possible, and the allocated bandwidth ratio of the ONU that sends the optical signal with the maximum received optical power is increased. For example, when the OLT performs detection of the received optical power of an optical signal from a first ONU on a standby port within a first preset time period, a second light-emitting time slot on the active port that is not occupied by the ONUs may be allocated to the first ONU, except for a first light-emitting time slot currently occupied by the first ONU, so that the first ONU sends the optical signal to the OLT in the first light-emitting time slot and the second light-emitting time slot. Thus, the OLT may detect the received optical power of the optical signal on the corresponding first and second light-emitting time slots of the first ONU. Illustratively, in this example, the second preset duration may be equal to only 1 detection period. Of course, in order to improve the detection accuracy, the received optical power of the optical signal may be detected on the corresponding first light-emitting time slot and second light-emitting time slot of the first ONU multiple times in multiple detection periods. And taking the maximum value detected in the multiple detections as the maximum received optical power of the standby port, namely the first maximum received optical power.

As an example, when the OLT detects the received optical power of the optical signal on the corresponding first and second light-emitting time slots of the first ONU, the received optical power of the optical signal may be detected on a plurality of detection time points on the first and second light-emitting time slots.

The following describes in detail a scheme implemented by determining whether the condition two and/or the condition three are satisfied in the embodiment of the present application.

Fig. 7 is a schematic flow chart of another optical power detection method provided in the embodiment of the present application.

S701, the OLT detects a first maximum received optical power and a first minimum received optical power in received optical powers of optical signals received by a first optical module installed on a first port within a first preset time period.

S702, the OLT determines that the first minimum received optical power of the standby port is smaller than a third threshold value and/or the first maximum received optical power of the standby port is larger than a second threshold value, and outputs alarm information.

Illustratively, the second threshold is less than or equal to a maximum value of a reception sensitivity of the first optical module optical power. The third threshold is greater than or equal to the minimum value of the receiving sensitivity of the optical power of the first optical module. For example, the optical power budget of the optical module ranges from-28 dB to-8 dB, the maximum value of the receiving sensitivity of the optical power of the first optical module may be equal to-8 dB or slightly less than-8 dB, and the minimum value of the receiving sensitivity of the optical power of the first optical module may be equal to-28 dB or slightly more than-28 dB.

In one possible design, upon determining that the first minimum received optical power of the standby port is greater than or equal to the third threshold and the first maximum received optical power of the standby port is less than or equal to the second threshold, alarm recovery information is output, where the alarm recovery information is used to indicate that the optical power of the standby port meets the requirement of the optical power budget.

When the first minimum received optical power of the standby port is smaller than the third threshold, the received optical power of the individual optical signal existing in the standby port is too low, and when the maximum received optical power of the standby port is greater than the second threshold, the received optical power of the individual optical signal existing in the standby port is too high. When the received optical power of an individual optical signal existing in the standby port is too high and/or too low, the output alarm information can be sent to the network manager, so that the network manager can adjust the link or the port which does not meet the requirement in time.

In a possible example, when S701 is executed, a "detection point translation" manner may be adopted, and specific reference is made to the relevant description in the embodiment shown in fig. 3, which is not described herein again.

In another possible example, in performing S701, a "dense triggering" manner may be adopted, and specific reference is made to the relevant description in the embodiment shown in fig. 3, which is not described herein again.

In yet another possible example, before performing S701, the OLT detects a second maximum received optical power and a second minimum received optical power of the received optical powers of the optical signals from the plurality of ONUs on a second optical module at the active port within a second preset time period. In general, the uplink flow of a PON port is much smaller than the theoretical bandwidth of the PON port, and optical power detection directly performed at a standby port has a high probability of missing a true maximum value, so as to reduce the probability of missing the maximum value and improve the probability of hitting the maximum and minimum received optical powers, the remaining bandwidth of an active port can be allocated to an ONU corresponding to the maximum received optical power and the minimum received optical power of an online active port as much as possible, and the allocation bandwidth occupation ratio of the ONU that sends optical signals of the maximum and minimum received optical powers is increased.

For example, taking fig. 4 as an example, the ONU2 is an ONU corresponding to the second maximum received optical power among the 4 ONUs, and the OTN3 is an ONU corresponding to the second minimum received optical power among the 4 ONUs.

For example, before performing S701, the OLT may allocate, to the ONUs 2 and 3, other light-emitting time slots on the active port that are not occupied by the 4 ONUs, except for the light-emitting time slot 1 currently occupied by the ONU2 and the light-emitting time slot 2 currently occupied by the ONU 2. Since the allocated bandwidth occupation ratio of the ONU that transmits the optical signals of the maximum and lowest received optical powers increases in the detection period, the probability that the standby port detects the maximum and minimum received optical powers is increased. For example, referring to fig. 8, the other bandwidths on the active port that are not occupied by the 4 ONUs are allocated to ONU2 and OTN 3.

Based on the same inventive concept as the above embodiment, the embodiment of the present application further provides a device. The device is applied to the OLT. The apparatus may be specifically a processor, a chip system, or a functional module for transmission. As shown in fig. 9, the apparatus includes a first detection module 901, a second detection module 902, and a processing module 903; the first detection module 901 is configured to execute S301 or S701, the second detection module 902 is configured to execute S303, and the processing module 903 is configured to execute S302 or S702.

Optionally, the three modules may also perform other relevant optional steps performed by the OLT in any of the embodiments, which are not described herein again.

The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional modules in the embodiments of the present application may be integrated into one processor, may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

An embodiment of the present application further provides an OLT structure, and as shown in fig. 10, OLT1000 includes a communication interface 1010A, a communication interface 1001B, a processor 1020, and a memory 1030. Illustratively, communication interface 1010A is an active port and communication interface 1010B is a standby port.

The first detecting module 901, the second detecting module 902 and the processing module 903 shown in fig. 9 can be implemented by a processor 1020. The processor 1020 receives the optical signal through the communication interface 1010A and, upon initiating the optical power budget detection for the standby port, the optical signal through the communication interface 1010B and is configured to implement the method performed by the OLT in fig. 3 and 7. In implementation, the steps of the processing flow may be implemented by instructions in the form of hardware integrated logic circuits or software in the processor 1020 to implement the method performed by the OLT in any of the embodiments described above.

In the illustrated embodiment, communication interface 1010A and communication interface 1010B may be circuits, buses, transceivers, or any other devices that can be used to exchange information. The other device may be, for example, a device connected to the apparatus 1000, for example, the other device may be an ONU.

The processor 1020 in the embodiments of the present application may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, that may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor, or in a combination of hardware and software elements in the processor. Program code executed by processor 1020 to implement the above-described methods may be stored in memory 1030. A memory 1030 is coupled to the processor 1020. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. Processor 1020 may operate in conjunction with memory 1030. The memory 1030 may be a nonvolatile memory such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory such as a random-access memory (RAM). The memory 1030 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.

The specific connection medium among the communication interface 1010, the processor 1020 and the memory 1030 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1030, the processor 1020, and the communication interface 1010 are connected by a bus in fig. 10, the bus is represented by a thick line in fig. 10, and the connection manner between other components is merely illustrative and not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

Based on the above embodiments, the present application embodiment may further provide a system, where the system includes an OLT and a plurality of ONUs. The OLT is used for transmitting optical signals to the ONU or receiving the optical signals transmitted by the ONU.

Based on the above embodiments, the present application further provides a computer storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors. The computer storage medium may include: u disk, removable hard disk, read only memory, random access memory, etc. may be used to store the program code.

Based on the above embodiments, the present application further provides a chip, where the chip includes a processor, and is configured to implement the functions related to any one or more of the above embodiments, such as acquiring or processing the data frame related to the above method. Optionally, the chip further comprises a memory for the processor to execute the necessary program instructions and data. The chip may be constituted by a chip, or may include a chip and other discrete devices.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method for detecting optical power, comprising:

the method comprises the steps that an Optical Line Terminal (OLT) detects at least one of a first maximum receiving optical power and a first minimum receiving optical power in receiving optical power of an optical signal received by a first optical module installed on a first port within a first preset time, wherein the first port is in a non-working state;

the OLT determines that at least one of a first condition, a second condition or a third condition is met, and outputs alarm information, wherein the alarm information is used for indicating that the optical power of the first port does not meet the requirement of an optical power budget;

wherein the first condition is that the first maximum received optical power is less than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, the third condition is that the first minimum received optical power is less than a third threshold, and the second threshold is greater than the first threshold;

the method further comprises the following steps:

the OLT detects a second maximum receiving optical power and a second minimum receiving optical power in receiving optical power of optical signals received by a second optical module installed on a second port within a second preset time, the second port is in a working state, and the received optical signals are from a plurality of Optical Network Units (ONU); wherein the first threshold is associated with a first difference value and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power;

before the OLT detects at least one of a first maximum received optical power and a first minimum received optical power in received optical power of an optical signal received by a first optical module installed on a first port within a first preset time, the OLT further includes:

2. The method of claim 1, wherein the second threshold is less than or equal to a receive sensitivity maximum for the first optical module optical power.

3. The method of claim 1, wherein the third threshold is greater than or equal to a receive sensitivity minimum for the first optical module optical power.

4. The method according to any one of claims 1 to 3, wherein the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods;

5. The method of claim 4, wherein the M is related to a minimum sampling interval supported by the OLT.

6. An optical power detection device, which is applied to an Optical Line Terminal (OLT), comprises:

the first detection module is used for detecting at least one of a first maximum received optical power and a first minimum received optical power in the received optical power of an optical signal received by a first optical module installed on a first port within a first preset time period, and the first port is in a non-working state;

the second detection module is configured to detect a second maximum received optical power and a second minimum received optical power in received optical powers of optical signals received by a second optical module installed on a second port within a second preset time period, where the second port is in a working state, and the received optical signals are from a plurality of optical network units ONU; wherein the first threshold is associated with a first difference value and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power;

7. The apparatus of claim 6, wherein the second threshold is less than or equal to a receive sensitivity maximum of the first light module optical power.

8. The apparatus of claim 6, wherein the third threshold is greater than or equal to a receive sensitivity minimum for the first light module optical power.

9. The apparatus according to any one of claims 6-8, wherein the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods;

10. The apparatus of claim 9, wherein the M is related to a minimum sampling interval supported by the OLT.

11. An optical line terminal comprising a processor and a memory, wherein:

the memory is used for storing program codes;

the processor is used for reading and executing the program codes stored in the memory so as to realize the method of any one of claims 1 to 5.

12. A passive optical network, PON, system comprising the OLT of claim 11 and a plurality of ONUs in communication with the OLT.

13. A computer-readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 5.