CN114337806A

CN114337806A - Optical power detection method, device and optical network terminal

Info

Publication number: CN114337806A
Application number: CN202011086593.XA
Authority: CN
Inventors: 张景伟; 卢艳东; 张旭东
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2022-04-12

Abstract

The application discloses an optical power detection method, an optical power detection device and an optical network terminal, aiming at improving the flexibility and precision of optical power reporting of a COMBO networking. The method comprises the following steps: the optical network terminal ONT receives a downlink optical signal from an optical line terminal OLT, wherein the downlink optical signal comprises optical signals with a first wavelength and a second wavelength, and the ONT determines the total received optical power of the downlink optical signal according to the first received optical power, the first transmitted optical power and the second transmitted optical power; the first receiving optical power is the optical power of the downlink optical signal received after the ONT filters the optical signal with the second wavelength, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal obtained by calculation.

Description

Optical power detection method, device and optical network terminal

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to an optical power detection method, an optical power detection device and an optical network terminal.

Background

With the development of Passive Optical Networks (PON), optical networks such as Gigabit PON (GPON) and Ethernet Passive Optical Network (EPON) begin to be widely and rapidly expanded in a large scale. With the increasing demand of user data, 10gigabit-capable passive optical network (10G PON) and 10gigabit-capable ethernet passive optical network (10 GEPON) are also in widespread use.

In the process of the GPON evolution or upgrade to the 10GPON, there may be a scenario where GPON and 10GPON access coexist, such as an OLT. Similarly, in the process of the evolution or upgrade of the EPON to the 10GEPON, there may be a scenario where EPON and 10GEPON accesses coexist. In the present application, a network in which multiple PONs are accessed and coexisted is referred to as a Combined (COMBO) network. In a single access PON networking environment, the signal in the fiber is of a single wavelength. For example, in a single GPON or EPON networking environment, the wavelength of the signal in the fiber is 1490 nanometers (nm), and in a single 10GPON or 10GEPON networking environment, the wavelength of the signal in the fiber is 1577 nm. In a COMBO networking environment, signals of at least two wavelengths exist in the optical fiber, for example, signals of two wavelengths of 1490nm and 1577nm exist in the optical fiber at the same time.

In the prior art, an Optical Network Terminal (ONT) performs optical power detection on an optical signal with a single wavelength. In a COMBO networking environment, how to perform optical power detection is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides an optical power detection method, an optical power detection device and an optical network terminal, so that the accuracy of optical power detection is improved in a COMBO networking environment.

In a first aspect, an optical power detection method is provided, which may be applied to an Optical Network Terminal (ONT) or a device matched with the ONT. The method can be realized by the following steps: the ONT receives a downlink optical signal from an Optical Line Terminal (OLT), wherein the downlink optical signal comprises an optical signal with a first wavelength and an optical signal with a second wavelength, and determines a second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power; the ONT determines a total received optical power of the downlink optical signal based on the first received optical power and the second received optical power. The first receiving optical power is the optical power of the downlink optical signal received after the ONT filters the optical signal with the second wavelength, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal obtained by calculation. By the method, in a COMBO networking environment, the ONT can detect not only the optical power of a received optical signal with a single wavelength, but also the optical signal power of other wavelengths transmitted in the optical fiber, and the total received optical power of optical signals with multiple wavelengths transmitted in the optical fiber. Therefore, the accuracy and the flexibility of optical power detection of the ONT are improved. When a network operation and maintenance person uses the optical power meter to detect the optical power, the total receiving optical power of the downlink optical signal is determined through the ONT, the total receiving optical power is the receiving optical power of two wavelength signals including a signal with a first wavelength and a signal with a second wavelength, the total receiving optical power is the same as or nearly the same as the display value of the optical power meter, or the difference between the total receiving optical power and the display value of the optical power meter is smaller than a certain threshold value. In addition, the method can save cost without changing the existing software and hardware architecture, and can realize the calibration of the display optical power without changing the optical power meter by a client.

It should be noted that, in the embodiment of the present application, the ONT is taken as an example for description, and it should be understood by those skilled in the art that the method described in the present application is also applicable to an Optical Network Unit (ONU).

In one possible design, the method further includes: the ONT receives networking information from the OLT, and the networking information indicates that optical fibers of the passive optical network transmit optical signals with various wavelengths. The method for measuring optical signals with two wavelengths provided by the embodiment of the present application may be determined according to networking information, where the networking information is equivalent to a function switch, and is compatible with the original version of ONT, and the method of the embodiment of the present application may be started only when the networking information indicates that an optical fiber of a passive optical network transmits optical signals with multiple wavelengths.

In one possible design, the networking information further includes: the first emitted optical power and the second emitted optical power.

In one possible design, the ONT determines the second received optical power from the first received optical power, the first emitted optical power and the second emitted optical power by: the ONT determines the optical power attenuation amount according to the first transmitting optical power and the first receiving optical power; the ONT determines the second received optical power according to the second transmitted optical power and the optical power attenuation.

In one possible design, the second received optical power conforms to the following equation: d ═ B- (a-C); wherein D is the second received optical power, B is the second emitted optical power, A is the first emitted optical power, and C is the first received optical power.

In one possible design, the total received optical power of the downstream optical signal conforms to the following equation:

d ═ B- (a-C); wherein E is a total received optical power of the downlink optical signal, D is the second received optical power, the second received optical power is a received optical power of the optical signal with the second wavelength in the downlink optical signal, B is the second transmitted optical power, a is the first transmitted optical power, and C is the first received optical power.

In one possible design, the first wavelength is 1490 nanometers nm and the second wavelength is 1577 nm; alternatively, the first wavelength is 1577nm and the second wavelength is 1490 nm.

In one possible design, the ONT reports the total received optical power. That is, in a COMBO networking environment, the ONT measures the received optical power and displays the measured optical power on a web page, so that the total received optical power can be displayed. The total received optical power of the display is the same as or equivalent to the value of the optical power measured by the operation and maintenance personnel by using the optical power meter, so that the operation and maintenance personnel can carry out optical power calibration.

In one possible design, the method further includes: and the ONT reports the first receiving optical power and the second receiving optical power. Under the COMBO networking environment, the ONT measures the received optical power and displays the measured optical power on a webpage, and can also display the first received optical power and the second received optical power.

In a second aspect, there is provided an optical network terminal comprising a first slide, a second slide, a third slide and a fourth slide, wherein: the first glass sheet is used for transmitting the optical signal with the first wavelength in the downlink optical signals from the optical line terminal OLT, so that the transmitted optical signal with the first wavelength is transmitted into the third glass sheet; the optical signal of the second wavelength in the downlink optical signals is deflected, so that the deflected optical signals of the second wavelength are transmitted into the second glass slide; a second glass slide for transmitting an incoming optical signal of a second wavelength; the third glass sheet is used for deflecting the transmitted optical signal with the first wavelength, so that the deflected optical signal with the first wavelength is transmitted into the fourth glass sheet; and the fourth glass sheet is used for transmitting the incoming optical signals with the first wavelength. The ONT is capable of transmitting two optical signals at a single wavelength such that a first received optical power of the optical signal at a first wavelength and a second received optical power of the optical signal at a second wavelength are both measured by the ONT. The measurement mode is more flexible, and the optical power reporting mode is further more flexible.

In a possible design, the optical network terminal further includes a measurement module, configured to measure a first received optical power and a second received optical power, where the first received optical power is an optical power of the optical signal with the first wavelength transmitted by the first glass sheet, and the second received optical power is an optical power of the optical signal with the second wavelength transmitted by the second glass sheet.

Based on the same inventive concept as the first aspect, a third aspect provides an optical power detection apparatus, including: the optical line terminal comprises a communication module, a first Optical Line Terminal (OLT) and a second Optical Line Terminal (OLT), wherein the communication module is used for receiving a downlink optical signal from the OLT, and the downlink optical signal comprises an optical signal with a first wavelength and an optical signal with a second wavelength; the processing module is used for determining second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power; wherein the first receiving optical power is the optical power of the downlink optical signal received after the optical signal with the second wavelength is filtered by the device, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the calculated optical power of the optical signal with the second wavelength in the downlink optical signal; the processing module is further configured to determine a total received optical power of the downlink optical signal according to the first received optical power and the second received optical power.

In one possible design, the communication module is further to: and receiving networking information from the OLT, wherein the networking information indicates that optical fibers of the passive optical network transmit optical signals with various wavelengths.

In one possible design, when determining the second received optical power based on the first received optical power, the first emitted optical power, and the second emitted optical power, the processing module is configured to: determining the optical power attenuation amount according to the first transmitting optical power and the first receiving optical power; and determining the second receiving optical power according to the second transmitting optical power and the optical power attenuation amount.

In one possible design, the communication module is further to: and reporting the total received optical power.

In one possible design, the communication module is further to: and reporting the first receiving optical power and the second receiving optical power.

The beneficial effects of the third aspect can refer to the description of the first aspect, and are not described herein again.

In a fourth aspect, the present application further provides an apparatus, which may be an ONT, configured to implement the method described in the first aspect; the apparatus may also be other apparatus capable of supporting the ONT to implement the method described in the first aspect, for example, an apparatus that may be provided in the ONT. The ONT may be a chip system, a module, a circuit, or the like disposed therein, and this application is not particularly limited thereto. The apparatus comprises a processor and a communication interface for implementing the functionality of the ONT in the method described in the first aspect above. 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 functions of the ONT in the method described in the first aspect. The communication interface is used for the device to communicate with other equipment. Illustratively, the other device is an OLT. 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 fifth 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 sixth 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 seventh aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor, and the processor includes a memory or the processor may include a memory, and is configured to implement the functions of the ONT in the foregoing method. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In an eighth aspect, an embodiment of the present application provides a system, where the system includes an OLT and an ONT. The ONT is adapted to perform the method of the first aspect or any design of the first aspect.

Drawings

Fig. 1 is a schematic view of a topology of an optical communication system in an embodiment of the present application;

FIG. 2 is a schematic diagram of a GPON &10GPON COMBO receiving optical path in the embodiment of the present application;

fig. 3 is a schematic diagram of optical power reporting and optical power meter measurement of an ONT in the embodiment of the present application;

FIG. 4 is a schematic flowchart illustrating an optical power detection method according to an embodiment of the present application;

fig. 5 is a schematic diagram of an optical signal of networking information in an embodiment of the present application;

FIG. 6a is a schematic diagram of an ONT architecture in an embodiment of the present application;

FIG. 6b is a second schematic diagram of the ONT architecture in the present application;

FIG. 7a is a schematic diagram of a display interface of an ONT displaying received optical power according to an embodiment of the present application;

FIG. 7b is a second schematic diagram of a display interface of the ONT displaying the received optical power according to the embodiment of the present application;

FIG. 7c is a third schematic diagram of a display interface of the ONT displaying the received optical power according to the embodiment of the present application;

FIG. 8 is a schematic structural diagram of an optical power detection apparatus according to an embodiment of the present application;

fig. 9 is a second schematic structural diagram of an optical power detection apparatus according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides an optical power detection method, an optical power detection device and an optical network terminal, so as to improve the accuracy of optical power reporting in a COMBO networking environment. The method and the device are based on the same or similar technical conception, and because the principle of solving the problems of the method and the device is similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated. In addition, it is to be understood that the terms first, second, third and the like in the description of the present application are used for distinguishing between the descriptions and are not to be construed as indicating or implying relative importance or order.

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 COMBO networking system. For example, the evolution user of 10GPON needs to consider the smooth transition from GPON to 10GPON, so the practical application environment of the 10GPON system is the COMBO networking of GPON and 10 GPON.

In the embodiment of the present application, the COMBO networking may be a networking of a GPON and a 10GPON (denoted as GPON &10GPON COMBO), or a networking of an EPON and a 10GEPON (denoted as EPON &10GEPON COMBO). COMBO networking may also be a combination of any of a variety of PON systems. For example, the PON system in a COMBO networking may also be a time and wavelength division multiplexing passive optical network (TWDM-PON), a ten gigabit-capable passive optical network (XG-PON) system, or a ten gigabit-capable symmetric passive optical network (XGs-PON) system, as well as various systems evolving in the future.

The wavelengths for transmitting optical signals in the optical fibers in the COMBO networking system may include two or more, and the embodiment of the present application is described by taking an example that the optical fibers in the COMBO networking system transmit optical signals with two wavelengths. In a single PON system the wavelength of the signals in the fibre is single and in a COMBO network the fibre comprises signals at both wavelengths. The COMBO system is one in which the optical fiber carries two wavelengths of optical signals, one for each of the two wavelengths of signals in the optical fiber of the single PON system. For example, the signal wavelength in the fiber is 1490nm in a single GPON or EPON system, and 1577nm in a single 10GPON or GEPON system. In a GPON &10GPON COMBO networking system, or an EPON &10GEPON COMBO networking system, signals of two wavelengths, 1490nm and 1577nm, are included in the optical fiber.

The following describes an architecture of an optical communication system to which the embodiments of the present application can be applied. The optical communication system includes an OLT and a plurality of Optical Network Units (ONUs), which may also be referred to as ONTs. For example, if an ONU directly provides a user port function, such as an ethernet user port for a Personal Computer (PC) to access the internet, the ONU may be called an ONT.

In the embodiment of the present application, the ONT is taken as an example for description. The OLT communicates with a plurality of ONTs, the optical communication system may further include an Optical Distribution Network (ODN), and the plurality of ONUs may be connected to a PON port of the same OLT through the ODN. 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 PC, in the network topology shown in fig. 1, there is only a 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 device on the user side and the router device on the network side to perform the functions of convergence and access, and the OLT can access various network devices, such as a PC, a mobile station, an ONU, an ONT, and the like.

In an optical communication system, a communication direction from the OLT to the ONTs is called downstream, and a communication direction from the ONTs to the OLT is called upstream.

The ONT reports the received optical power of the downlink signal, and the following method is generally adopted for reporting the received optical power in a general single PON-mode networking environment.

Before the ONT leaves a factory, a Photodiode (PD) or an Avalanche Photodiode (APD) is used for carrying out curve fitting on sampling points of optical signals according to the difference of response currents of different optical signals, and parameters of optical power detection are obtained. Typically, 5 sampling points are selected. For example, an optical signal received by the ONT is converted into a current through photoelectric conversion, a sampling circuit in the ONT performs analog-to-digital conversion (AD) on the current value, and the converted value is an AD value, which may also be referred to as a received optical power AD value. The ONT can adjust the power intensity of the downstream optical signal by adjustable optical attenuation, and fit a curve by using a unitary fourth-order polynomial shown in formula (1) to convert the received optical power AD value into actual received optical power.

Rx＝C4⁴*rx⁴+C3³*rx³+C2²*rx²+C1¹*rx¹+ C0 formula (1).

In the formula (1), Rx represents the actual received optical power, and Rx represents the received optical power AD. Selecting 5 different sampling points, solving coefficients C0, C1, C2, C3 and C4 in the formula (1), wherein the coefficients C0, C1, C2, C3 and C4 are parameters for optical power detection.

In practical application, the received optical power of the downlink signal is detected and reported by using the obtained optical power detection parameters. The ONT can substitute the sampled received optical power AD value into the formula (1), fit the actual received optical power and report the optical power.

In addition, in practical application, a user may use an optical power meter to detect the power of the signal, and the user may be a network operation and maintenance person. In a single PON mode networking environment, signals in the optical fiber are of a single wavelength, so a value reported by the received optical power and a value displayed by the optical power meter can basically keep a certain degree of coincidence.

The above is a mode of receiving optical power detection in a single PON mode networking environment.

In a COMBO networking environment, the downstream signal in the fiber is typically a combination of signals at two wavelengths. For example, a 10GPON system may be a COMBO networking, i.e., GPON &10GPON COMBO, due to the need for smooth transitions. The downlink signal of the 10GPON system comprises signals with two wavelengths of 1490nm and 1577 nm. For 10GPON traffic, only 1577nm signals may be needed, so 1490nm signals need to be filtered out in the ONTs. As shown in fig. 2, a schematic diagram of a GPON &10GPON COMBO receive optical path is illustrated. The downward optical signals with the wavelengths of 1490nm and 1577nm enter the optical fiber, are reflected by the 45-degree glass slide, the signals with the two wavelengths are reflected and then the propagation directions of the signals are deflected, when the deflected downward signals enter the 0-degree glass slide, the 1490nm signals are filtered by the 0-degree glass slide, and only the 1577nm signals enter a packaged laser or a receiver (TO). When a mode of receiving optical power detection in a single PON mode networking environment is adopted, the ONT may finally measure the optical power of a 1577nm signal and report the optical power. Therefore, in COMBO environment, although signals of two wavelengths propagate through the optical fiber, only the optical power of 1577nm signal is detected because 1490nm signal is filtered out.

If the optical power meter is used for performing power detection on the downlink signal of the COMBO networking, the optical power meter will receive signals with two wavelengths at the same time, so that the power displayed by the optical power meter is the power of the signals with two wavelengths, which results in a large difference between the ONT optical power report value and the optical power meter display value, for example, the difference may exceed 3 db.

Based on the example of fig. 2, as shown in fig. 3, a schematic diagram of optical power reporting and optical power meter measurement of the ONT is shown. The downlink signal from OLT is outputted through wave-separating wave-combining device to ONT. The ONT is connected with the PC level, and the PC can realize the view of the optical power detection value of the ONT through a webpage. The downstream signals output by the wave-splitting and wave-combining device comprise signals with two wavelengths of 1490nm and 1577 nm. Based on the configuration shown in fig. 2, the ONT can filter the 1490nm signal, so as to report the 1577nm signal with optical power. And detecting the power of the downlink signal output by the wave division and wave combination device by using an optical power meter. The optical power meter receives signals of two wavelengths, 1490nm and 1577nm, and therefore the optical power meter displays a power superposition value of the signals of the two wavelengths. It can be understood that, through the arrangement of the glass in the configuration of the ONT, the ONT can also filter the signals with the wavelength of 1577nm and report the optical power of the signals with the wavelength of 1490 nm.

Based on the problem that the difference between the ONT optical power report value and the optical power meter display value is large in fig. 2 and fig. 3, the method for reporting optical power provided in the embodiment of the present application can help to reduce the difference between the optical power report value and the optical power meter display value when reporting optical power in a COMBO networking environment.

The method for reporting the optical power can be applied to an optical communication system, and the optical communication system comprises a passive optical network. The optical fiber of the passive optical network transmits optical signals with multiple wavelengths, and for example, the optical fiber of the passive optical network transmits optical signals with two wavelengths, the two wavelengths can be referred to as a first wavelength and a second wavelength. The first wavelength is a wavelength of a signal in an optical fiber of a first Passive Optical Network (PON) in a single PON system, and the second wavelength is a wavelength of a signal in an optical fiber of a second Passive Optical Network (PON) in the single PON system. The first passive optical network and the second passive optical network may be any two types of PONs. The passive optical network applied by the method provided by the embodiment of the present application can also be considered as a combined passive optical network (COMBO-PON) formed by a first passive optical network and a second passive optical network. Optical signals of a first wavelength and a second wavelength are transmitted in optical fibers in a COMBO-PON. The COMBO-PON is configured in any manner, and the embodiments of the present application are not limited thereto.

As shown in fig. 4, a specific flow of the optical power detection method provided in the embodiment of the present application is as follows.

S401, the OLT sends a downlink optical signal to the ONT, and the ONT receives the downlink optical signal from the optical line terminal OLT.

The downlink optical signal includes an optical signal with a first wavelength and an optical signal with a second wavelength, the first wavelength is the wavelength of the downlink optical signal in the optical fiber when the first passive optical network is in a single networking environment, and the second wavelength is the wavelength of the downlink optical signal in the optical fiber when the second passive optical network is in the single networking environment.

S402, the ONT determines a second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power.

And S403, the ONT determines the total receiving optical power of the downlink optical signal according to the first receiving optical power and the second receiving optical power.

The first receiving optical power is the optical power of the downlink optical signal received after the ONT filters the optical signal with the second wavelength, and may also be considered as the optical power of the optical signal with the first wavelength in the downlink optical signal. The first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, and the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT. The second received optical power is the calculated received optical power of the optical signal of the second wavelength in the downlink optical signal.

When the optical power detection mode is adopted in a single PON mode networking environment, in a COMBO environment, although signals of two wavelengths propagate in an optical fiber, since a signal of one wavelength is filtered out, only the optical power of a signal of the other wavelength is detected. By the method provided by the embodiment of fig. 4, the ONT may detect the optical power of the optical signals of two wavelengths transmitted in the optical fiber, and may also detect the total received optical power of the optical signals of multiple wavelengths transmitted in the optical fiber. Therefore, the accuracy and the flexibility of optical power detection of the ONT are improved.

When a network operation and maintenance person uses an optical power meter to detect optical power, if a mode of receiving optical power detection in a single PON mode networking environment is adopted, the ONT detects the optical power of an optical signal with one wavelength, the difference between the optical power of the optical signal and the detection value of the optical power meter is too large, and the operation and maintenance person can consider that the arrangement is in a problem or the product quality is in a problem. By the method provided in the embodiment of fig. 4, the ONT determines the total received optical power of the downlink optical signal, where the total received optical power is the received optical power of two wavelength signals including the signal of the second wavelength of the signal of the first wavelength, and the total received optical power is the same as or close to the same value as the display value of the optical power meter, or the difference between the total received optical power and the display value of the optical power meter is smaller than a certain threshold value. In addition, the method can save cost without changing the existing software and hardware architecture, and can realize the calibration of the display optical power without changing the optical power meter by a client.

Some alternative implementations of the embodiment of fig. 4 are described below.

Optionally, before S401, S400 is further included.

S400, the OLT sends information to the ONTs, and the information can be called networking information or other names. The ONT receives the networking information from the OLT.

The networking information may include or instruct optical fibers of the passive optical network to transmit optical signals of multiple wavelengths, for example, optical fibers of the passive optical network transmit optical signals of two wavelengths. The networking information may further include or indicate that the networking environment is a combined passive optical network, and may further specifically indicate that the passive optical networks constituting the combined passive optical network are a first passive optical network and a second passive optical network. For example, the networking information includes a port module type, and the port module type indicates whether the module is a COMBO module or a single mode module.

For example, the first passive optical network is GPON, and the second passive optical network is 10 GPON;

for another example, the first passive optical network is EPON, and the second passive optical network is 10 GEPON;

for another example, the first passive optical network is GPON, and the second passive optical network is 10 GEPON;

as another example, the first passive optical network is EPON and the second passive optical network is 10 GPON.

Optionally, the networking information may further include a wavelength of a downlink optical signal in the optical fiber when the first passive optical network is in a single networking environment, that is, a first wavelength; the networking information may also include a wavelength of a downstream optical signal in the optical fiber, i.e., a second wavelength, of the second passive optical network when in the single networking environment. The ONT may also acquire the first wavelength and the second wavelength according to a pre-configuration.

The first wavelength may be 1490nm when the first passive optical network is GPON or EPON. The second wavelength may be 1577nm when the second passive optical network is 10GPON or 10 GEPON.

The networking information may also include the first and second emitted optical powers described above.

Figure 5 illustrates an optical signal diagram of one possible networking information.

In this embodiment of the application, if the networking information sent by the OLT to the ONT indicates that the networking environment is a single PON system, for example, a single GPON, a single EPON, a single 10GPON, or a single 10GEPON, the ONT reports the received optical power in a conventional manner, for example, a manner of reporting the received optical power in the single PON mode networking environment. And when the OLT indicates that the networking environment is a single GPON or EPON to the networking information of the ONT hairstyle, the ONT reports the receiving power corresponding to the 1490nm optical signal. And when the networking information sent to the ONT by the OLT indicates that the networking environment is a single 10GPON or 10GEPON, the ONT reports the receiving power corresponding to the 1577nm optical signal.

An alternative method for determining the received optical power of the downlink optical signal is described below, where the received optical power includes a first received optical power, a second received optical power, and a total received optical power.

The ONT filters out the optical signal with the second wavelength, and then receives the optical power of the downlink optical signal as the first received optical power, or measures the optical power of the optical signal with the first wavelength as the first received optical power. Therefore, the first received optical power can be directly measured and reported by the ONT.

The second received optical power is the calculated received optical power of the optical signal of the second wavelength in the downlink optical signal.

The ONT knows the first and second emitted optical powers, and the optical signals at the first and second wavelengths are both emitted by the OLT and reach the ONT via the same optical fiber conditions, and the power attenuation intensities of the optical signals at the first and second wavelengths can be considered to be the same or approximately equivalent. Based on this, the ONT may determine the second received optical power from the first received optical power, the first transmitted optical power and the second transmitted optical power.

A power attenuation value of the optical signal at the first wavelength from the OLT to the ONT is determined based on the first received optical power and the first transmitted optical power, e.g. the power attenuation value is (first transmitted optical power-first received optical power). Then, the power attenuation value of the optical signal of the second wavelength from the OLT to the ONT may be considered to be also equal to (first transmitting optical power — first receiving optical power), and the power attenuation value of the optical signal of the second wavelength from the OLT to the ONT is expressed as (second transmitting optical power — second receiving optical power), so that (second transmitting optical power — second receiving optical power) is obtained as (first transmitting optical power — first receiving optical power), that is, the second receiving optical power is obtained as the second transmitting optical power- (first transmitting optical power — first receiving optical power).

The total received optical power is the received optical power of the downstream optical signal including both the first wavelength and the second wavelength. And combining a compensation value on the basis of the first received optical power to obtain the total received optical power. The offset value may be defined in a custom area of an a0 parameter table based on 8472 protocol, for example, the a0 parameter table is shown in table 1, a serial ID defined by SFP MSA occupies 96 bytes (bytes) from 0 to 95, and a specific vendor (vendor specific) occupies 32 bytes from 96 to 127. 128 bytes of 128-255 are reserved bytes (reserved), i.e. the custom area. The offset value (offset) may occupy the reserved byte.

TABLE 1

The total received optical power may be a sum of the first received optical power and the compensation value. Wherein the compensation value may be a value obtained by a set function operation of the first received optical power and the second received optical power. The set function may be a Log function.

For convenience of description, assume that a is the first emitted optical power, B is the second emitted optical power, C is the first received optical power, and D is the second received optical power. In the embodiment of the present application, the unit of optical power is dBm.

The received optical power of the optical signal at the second wavelength in the downlink optical signal (i.e., the second received optical power) satisfies the following formula: d ═ B- (a-C) formula (2).

The total received optical power of the downstream optical signal conforms to the following equation:

in the formula (3)

To compensate, E is the total received optical power of the downlink optical signal.

In the embodiment of the present application, in a networking environment of a COMBO-PON, an optical signal with one wavelength in downlink optical signals may be filtered according to a difference in an architecture of an ONT. For example, assuming that the ONT has the structure shown in fig. 2, a 1490nm wavelength signal in the downstream optical signal can be filtered out to obtain the received optical power of a 1577nm wavelength signal, and such an ONT is referred to as a first type ONT for convenience of description. It is conceivable that, based on a similar principle, by providing the glass slide, the ONT may also filter the 1577nm wavelength signal of the downstream optical signal to obtain the received optical power of the 1490nm wavelength signal, and such ONT is denoted as the second type ONT for convenience of description.

Based on this, the determination method of the received optical power is explained in terms of the first type ONT and the second type ONT, respectively.

Firstly, assuming that the first passive optical network is 10GPON or 10GEPON, the first wavelength may be 1577nm, the second passive optical network is GPON or EPON, the second wavelength may be 1490nm, and the ONT interfaced in the networking environment of COMBO-PON is the ONT of the first type.

The receiving optical power of the downlink optical signal measured after the first type of ONT filters the optical signal with the second wavelength (1490nm) is the first receiving optical power, that is, the first type of ONT measures the receiving optical power of the downlink optical signal with the first wavelength (1577nm) as the first receiving optical power, and the first receiving optical power can be directly measured and reported by the first type of ONT.

The second received optical power is the received optical power of an optical signal of a second wavelength (1490nm) in the downlink optical signal. The second received optical power may be determined according to the following equation: the second received optical power is the second transmitted optical power- (first transmitted optical power-first received optical power). The first emitted power is the emitted power of an optical signal having a wavelength of 1577nm, denoted as A1. The second emitted optical power is the emitted power of the optical signal with a wavelength of 1499nm, denoted B1. When the first received optical power is denoted by C1 and the second received optical power is denoted by D1, according to formula (1), D1 is B1- (a 1-C1).

The total received optical power of the downstream optical signal, denoted as E1, is calculated, according to equation (2),

second, assuming that the first passive optical network is a GPON or an EPON, the first wavelength may be 1490nm, the second passive optical network is a 10GPON or a 10GEPON, and the second wavelength may be 1577 nm. And the ONT which is docked in the networking environment of the COMBO-PON is the ONT of the second type.

The second type of ONT filters out the optical signal with the second wavelength (1577nm), and then measures the received optical power of the downlink optical signal to be the first received optical power, that is, the second type of ONT measures the received optical power of the downlink optical signal with the first wavelength (1490nm) to be the first received optical power, and the first received optical power can be directly measured and reported by the second type of ONT.

The second received optical power is the received optical power of an optical signal of a second wavelength (1577nm) in the downlink optical signal. The second received optical power may be determined according to the following equation: the second received optical power is the second transmitted optical power- (first transmitted optical power-first received optical power). The first emitted power is the emitted power of an optical signal with a 1490nm wavelength, denoted as A2. The second emitted optical power is the emitted power of the optical signal with a wavelength of 1577nm, denoted B2. When the first received optical power is denoted by C2 and the second received optical power is denoted by D2, according to formula (1), D2 is B2- (a 2-C2).

The total received optical power of the downstream optical signal, denoted as E2, is calculated, according to equation (2),

in summary, by the optical power detection method provided by the above embodiment, the total received optical power of the downlink optical signal can be detected, and the total received optical power determined based on the downlink optical signals with two wavelengths is similar to or the same as the display value of the optical power meter.

In addition, the ONT can also report the optical receiving power respectively corresponding to the two single PON systems. The method may be applicable to both the first type of ONT and the second type of ONT described above.

Based on the same technical concept, the embodiment of the present application further provides an ONT, which may be denoted as a third type of ONT. The third type of ONT applies to a combined passive optical network consisting of a first passive optical network and a second passive optical network. The architecture of this third type of ONT may be as shown in fig. 6 a. As described in detail below.

The ONT includes a first slide, a second slide, a third slide, and a fourth slide, wherein:

the first glass sheet is used for transmitting the optical signal with the first wavelength in the downlink optical signals from the OLT, so that the transmitted optical signal with the first wavelength is transmitted into the third glass sheet; the optical signal of the second wavelength in the downlink optical signals is deflected, so that the deflected optical signals of the second wavelength are transmitted into the second glass slide;

a second glass slide for transmitting an incoming optical signal of a second wavelength;

the third glass sheet is used for deflecting the transmitted optical signal with the first wavelength, so that the deflected optical signal with the first wavelength is transmitted into the fourth glass sheet;

a fourth glass slide for transmitting an incoming optical signal of the first wavelength;

the first wavelength is a wavelength of a downstream optical signal of the first passive optical network and the second wavelength is a wavelength of a downstream optical signal of the second passive optical network. The first wavelength is 1490nm and the second wavelength is 1577 nm; alternatively, the first wavelength is 1577nm and the second wavelength is 1490 nm.

Optionally, the second slide is also used to isolate optical signals other than those at the second wavelength.

Optionally, the fourth slide is also used to isolate optical signals other than those at the first wavelength.

It can be seen that optical signals of a single wavelength of the second wavelength can be transmitted out through the combined action of the first and second glass slides. The fourth glass can transmit the optical signal with the first wavelength and the single wavelength.

The third type of ONT may further comprise a measurement module for measuring a first received optical power of the optical signal of the first wavelength transmitted by the first glass slide and a second received optical power of the optical signal of the second wavelength transmitted by the second glass slide.

The third type of ONT is capable of transmitting two optical signals of a single wavelength compared to the first and second types of ONT, such that a first received optical power of the optical signal of the first wavelength and a second received optical power of the optical signal of the second wavelength are both measurable by the third type of ONT.

The measurement module may further measure the total received power, and specifically, the total received power may be determined according to the first received optical power and the second received optical power, and the method may refer to the method in fig. 4, which is not described herein again.

As shown in fig. 6b, the first to fourth slides are respectively represented by slide 1, slide 2, slide 3 and slide 4, taking the first wavelength as 1490nm and the second wavelength as 1577nm as an example, and the architecture of the third type of ONT is illustrated by way of example.

Upon optical power reporting, the ONT may display the value of the received optical power through an interface of the connected display. And displaying the received optical power through an interface, namely reporting the measured received optical power by the ONT. In a conventional display mode, the first type of ONT may display the received optical power of the downlink optical signal measured after filtering the optical signal with the second wavelength, that is, display the first received optical power of the optical signal with the first wavelength in the downlink optical signal; the second type of ONT may display a second received optical power of the downlink optical signal measured after filtering the optical signal with the first wavelength, that is, display the received optical power of the optical signal with the second wavelength in the downlink optical signal. In the embodiment of the present application, by the method provided in the embodiment of fig. 4, the ONT (including the ONT of the first type or the ONT of the second type) can obtain the total received optical power of the downlink optical signal, and therefore, the ONT can display the total received optical power. In addition, the ONT may also obtain the first and second received optical powers, respectively, which may also be displayed. In addition, with the third type of ONT provided in the embodiment of fig. 6a, the total received optical power can also be displayed, and the first received optical power and the second received optical power can also be displayed. Therefore, the optical power displayed by the ONT is the same as or less different from the optical power value detected by the operation and maintenance personnel through the optical power meter, so that the customer (for example, the operation and maintenance personnel) can conveniently distribute the ONT under the condition that the optical power meter is not replaced.

As shown in fig. 7a, one possible ONT display interface for receiving optical power is illustrated. The display interface includes the category of the received optical power (including the first received optical power, the second received optical power, and the total received optical power) and a power value corresponding to the received optical power. The types of the received optical power may be distinguished by a wavelength or a PON system, for example, the first received optical power corresponds to a first wavelength, the second received optical power corresponds to a second wavelength, and the total received optical power corresponds to the first wavelength and the second wavelength.

As shown in fig. 7b, assuming that the first wavelength is 1577nm and the second wavelength is 1490nm, the power value of the first received optical power is denoted by C, the power value of the second received optical power is denoted by D, and the power value of the total received optical power is denoted by E.

As shown in fig. 7c, the display interface of the ONT may also display some other information, for example. Currently displayed is network side information.

Optionally, if the pon is a single networking environment, for example, the pon is a single GPON or a single EPON, only the received optical power corresponding to the single networking is displayed in the display interface.

If the first type of ONT receives networking information of the OLT indicating that the networking environment is a COMBO environment, the ONT may display the total received optical power, or may display the first received optical power and the second received optical power; if the ONT of the first type receives networking information of the OLT indicating that the networking environment is a single first passive optical network, for example, a single 10GPON or 10GEPON, only the first received optical power is displayed, and the power value corresponding to the second received optical power and the total received optical power may not be displayed or may be displayed as "-".

If the second type of ONT receives networking information of the OLT indicating that the networking environment is a COMBO environment, the second type of ONT may display the total received optical power, or may display the first received optical power and the second received optical power; if the second type of ONT receives the networking information of the OLT indicating that the networking environment is a single second passive optical network, such as a single GPON or EPON, only the second received optical power is displayed, and the power value corresponding to the first received optical power and the total received optical power may not be displayed or may be displayed as "-".

For the third type of ONT, if the networking environment is indicated as COMBO environment by the networking information of the receiving OLT, the total received optical power may be displayed, and the first received optical power and the second received optical power may also be displayed. If the networking information received from the OLT indicates that the networking environment is a single first passive optical network, such as a single 10GPON or 10GEPON, only the first received optical power may be displayed, and the power value corresponding to the second received optical power and the total received optical power may not be displayed or may be displayed as "-". If the networking information received by the OLT indicates that the networking environment is a single second passive optical network, such as a single GPON or EPON, only the second received optical power is displayed, and the power values corresponding to the first received optical power and the total received optical power may not be displayed or may be displayed as "-".

In order to implement the functions in the method provided by the embodiments of the present application, the ONT may include a hardware structure and/or a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.

As shown in fig. 8, based on the same technical concept, the embodiment of the present application further provides an apparatus 800, where the apparatus 800 may be the ONT, an apparatus in the ONT, or an apparatus capable of being used with the ONT. In one design, the apparatus 800 may include a module corresponding to one or more of the methods/operations/steps/actions performed by the ONT in the foregoing method embodiments, where the module may be a hardware circuit, a software circuit, or a combination of a hardware circuit and a software circuit. In one design, the apparatus may include a processing module 801 and a communication module 802.

The communication module 802 is configured to receive a downlink optical signal from the OLT, where the downlink optical signal includes an optical signal at a first wavelength and an optical signal at a second wavelength.

The processing module is used for determining second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power; the first receiving optical power is the optical power of the downlink optical signal received after the device filters the optical signal with the second wavelength, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal obtained by calculation; and for determining a total received optical power of the downlink optical signal based on the first received optical power and the second received optical power.

The processing module 801 and the communication module 802 may also be configured to perform other corresponding steps or operations performed by the ONT according to the foregoing method embodiments, which are not described herein again.

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

Fig. 9 shows an apparatus 900 provided in this embodiment of the application, for implementing the functions of the ONT in the above method. The device may be an ONT, a device in an ONT, or a device capable of being used in cooperation with an ONT. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. The apparatus 900 includes one or more processors 920 for implementing the functionality of the ONT in the methods provided by the embodiments of the present application. Apparatus 900 may also include a communication interface 910. In embodiments of the present application, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface for communicating with other devices over a transmission medium. For example, the communication interface 910 is used for devices in the apparatus 900 to communicate with other devices. Illustratively, the other device may be an OLT. The processor 920 utilizes the communication interface 910 to send and receive data and is configured to implement the methods described in the above-described method embodiments. Illustratively, the communication interface 910 is configured to receive a downstream optical signal from the OLT, the downstream optical signal including an optical signal at a first wavelength and an optical signal at a second wavelength. The processor 920 is configured to determine a second received optical power according to the first received optical power, the first emitted optical power, and the second emitted optical power; the first receiving optical power is the optical power of the downlink optical signal received after the device filters the optical signal with the second wavelength, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal obtained by calculation; and for determining a total received optical power of the downlink optical signal based on the first received optical power and the second received optical power.

For details, reference is made to the detailed description in the method example, which is not repeated herein.

The apparatus 900 may also include at least one memory 930 for storing program instructions and/or data. The memory 930 is coupled to the processor 99. 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. The processor 920 may operate in conjunction with the memory 930. Processor 920 may execute program instructions stored in memory 930. At least one of the at least one memory may be included in the processor.

The specific connection medium among the communication interface 910, the processor 920 and the memory 930 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 930, the processor 920, and the communication interface 910 are connected by a bus 940 in fig. 9, the bus is represented by a thick line in fig. 9, and the connection manner between other components is merely illustrative and is 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. 9, but this does not indicate only one bus or one type of bus.

In the embodiments of the present application, the processor 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, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute 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 directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

In the embodiment of the present application, the memory 930 may be a non-volatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example, a random-access memory (RAM). The memory 930 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 memory 930 in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

When the apparatus 800 and the apparatus 900 are specifically chips or chip systems, the output or the reception of the communication module 802 and the communication interface 910 may be baseband signals. When the apparatus 800 and the apparatus 900 are embodied as devices, the communication module 802 and the communication interface 910 may output or receive radio frequency signals.

The embodiment of the application provides a computer storage medium, which stores a computer program, wherein the computer program comprises instructions for executing the optical power detection method provided by the embodiment.

The present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the optical power detection method provided by the above embodiments.

The embodiment of the present application further provides a chip, where the chip includes a processor and an interface circuit, the interface circuit is coupled to the processor, the processor is configured to run a computer program or instructions to implement the above optical power detection method, and the interface circuit is configured to communicate with other modules outside the chip. The processor may include a memory or the processor is coupled to a memory, the memory including computer programs or instructions run by the processor.

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.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

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 spirit and 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. An optical power detection method, comprising:

an optical network terminal ONT receives a downlink optical signal from an optical line terminal OLT, wherein the downlink optical signal comprises an optical signal with a first wavelength and an optical signal with a second wavelength;

the ONT determines a second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power; wherein the first receiving optical power is the optical power of the downlink optical signal received after the ONT filters the optical signal with the second wavelength, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the calculated optical power of the optical signal with the second wavelength in the downlink optical signal;

and the ONT determines the total receiving optical power of the downlink optical signal according to the first receiving optical power and the second receiving optical power.

2. The method of claim 1, wherein the method further comprises:

the ONT receives networking information from the OLT, and the networking information indicates that optical fibers of the passive optical network transmit optical signals with various wavelengths.

3. The method of claim 2, wherein the networking information further comprises: the first emitted optical power and the second emitted optical power.

4. A method according to any of claims 1 to 3, wherein the ONT determines the second received optical power from the first received optical power, the first emitted optical power and the second emitted optical power, comprising:

the ONT determines the optical power attenuation amount according to the first transmitting optical power and the first receiving optical power;

the ONT determines the second received optical power according to the second transmitted optical power and the optical power attenuation.

5. The method of any of claims 1-4, wherein the second received optical power conforms to the following equation:

d ═ B- (a-C); wherein D is the second received optical power, B is the second emitted optical power, A is the first emitted optical power, and C is the first received optical power.

6. The method of any of claims 1 to 5, wherein the total received optical power of the downstream optical signal conforms to the following equation:

wherein E is a total received optical power of the downlink optical signal, D is the second received optical power, the second received optical power is a received optical power of the optical signal with the second wavelength in the downlink optical signal, B is the second transmitted optical power, a is the first transmitted optical power, and C is the first received optical power.

7. The method of any one of claims 1 to 6, wherein the first wavelength is 1490nm and the second wavelength is 1577 nm;

alternatively, the first wavelength is 1577nm and the second wavelength is 1490 nm.

8. The method of any one of claims 1 to 7, further comprising:

and the ONT reports the total receiving optical power.

9. The method of any one of claims 1 to 8, further comprising: and the ONT reports the first receiving optical power and the second receiving optical power.

10. An optical network terminal comprising a first slide, a second slide, a third slide, and a fourth slide, wherein:

the first glass sheet is used for transmitting the optical signal with the first wavelength in the downlink optical signals from the optical line terminal OLT, so that the transmitted optical signal with the first wavelength is transmitted into the third glass sheet; and the optical signal of the second wavelength in the downlink optical signal is deflected, so that the deflected optical signal of the second wavelength is transmitted into the second glass slide;

the second glass slide is used for transmitting an incoming optical signal with a second wavelength;

the fourth glass sheet is used for transmitting the incoming optical signals with the first wavelength.

11. The optical network terminal of claim 10, wherein the first wavelength is 1490nm, the second wavelength is 1577 nm; alternatively, the first wavelength is 1577nm and the second wavelength is 1490 nm.

12. The optical network terminal according to claim 10 or 11, wherein the optical network terminal further comprises:

and the measurement module is used for measuring a first receiving optical power and a second receiving optical power, wherein the first receiving optical power is the optical power of the optical signal with the first wavelength transmitted by the first glass sheet, and the second receiving optical power is the optical power of the optical signal with the second wavelength transmitted by the second glass sheet.

13. An optical power detection apparatus, comprising:

the optical line terminal comprises a communication module, a first Optical Line Terminal (OLT) and a second Optical Line Terminal (OLT), wherein the communication module is used for receiving a downlink optical signal from the OLT, and the downlink optical signal comprises an optical signal with a first wavelength and an optical signal with a second wavelength;

the processing module is used for determining second receiving optical power according to the first receiving optical power, the first transmitting optical power and the second transmitting optical power; wherein the first receiving optical power is the optical power of the downlink optical signal received after the optical signal with the second wavelength is filtered by the device, the first transmitting optical power is the optical power of the optical signal with the first wavelength in the downlink optical signal transmitted by the OLT, the second transmitting optical power is the optical power of the optical signal with the second wavelength in the downlink optical signal transmitted by the OLT, and the second receiving optical power is the calculated optical power of the optical signal with the second wavelength in the downlink optical signal; and the optical transceiver is used for determining the total receiving optical power of the downlink optical signal according to the first receiving optical power and the second receiving optical power.

14. The apparatus of claim 13, wherein the communication module is further configured to:

and receiving networking information from the OLT, wherein the networking information indicates that optical fibers of the passive optical network transmit optical signals with various wavelengths.

15. The apparatus of claim 14, wherein the networking information further comprises: the first emitted optical power and the second emitted optical power.

16. The apparatus of any of claims 13 to 15, wherein in determining the second received optical power based on the first received optical power, the first emitted optical power, and the second emitted optical power, the processing module is configured to:

determining the optical power attenuation amount according to the first transmitting optical power and the first receiving optical power;

and determining the second receiving optical power according to the second transmitting optical power and the optical power attenuation amount.

17. An apparatus according to any one of claims 13 to 16, wherein the second received optical power conforms to the following equation:

18. The apparatus of any of claims 13-17, wherein the total received optical power of the downstream optical signal satisfies the following equation:

19. The device of any of claims 13-18, wherein the first wavelength is 1490nm and the second wavelength is 1577 nm;

20. The apparatus of any of claims 13-19, wherein the communication module is further configured to:

and reporting the total received optical power.

21. The apparatus of any of claims 13-20, wherein the communication module is further configured to: and reporting the first receiving optical power and the second receiving optical power.

22. An optical power detection device comprising a processor and a communication interface, wherein:

the communication interface is used for communicating with other equipment;

the processor is used for calling program instructions to implement the method of any one of claims 1 to 9.

23. The apparatus of claim 22, wherein the apparatus further comprises a memory storing program instructions called by the processor.

24. A computer-readable storage medium having stored thereon computer instructions which, when executed by a computer, cause the method of any of claims 1-9 to be performed.