Method and apparatus for detecting wavelength interference in a combo-pon system

Abstract

The application relates to a detection method and device for wavelength interference in a COMBO-PON system, and relates to the technical field of passive optical networks. The method comprises the following steps: for two wavelength subchannels to be detected, all first optical network units under a first wavelength subchannel are not light-emitting; an uplink optical signal detection threshold of the first wavelength subchannel is reduced; when an optical signal is detected in the uplink direction of the first wavelength subchannel, uplink wavelengths of the two wavelength subchannels exist interference. The application can detect the uplink wavelength interference of the two wavelength subchannels in the COMBO-PON system, and the detection method is simple.

Description

Technical Field

[0001] This application relates to the field of passive optical network technology, specifically to a method and apparatus for detecting wavelength interference in a COMBO-PON system. Background Technology

[0002] Compared to single-mode PON (Passive Optical Network), Combo-PON (multi-mode PON) is a combination of multiple PON modes. For example, XG Combo-PON is a combination of GPON and XG-PON modes, supporting mixed access of GPON and XG-GPON terminals; 50G tri-mode COMBO-PON is a combination of 50G-PON, 10G-PON (XG-PON, XGS-PON or 10G EPON), and 1G-PON (GPON or EPON), supporting access of 50G-PON, 10G-PON and 1G-PON terminals.

[0003] In a COMBO-PON system, there are multiple wavelengths in the uplink. Generally, coated filters are used to separate or isolate different wavelengths, and the isolation between wavelengths is required to be greater than 30dB.

[0004] In a 10G COMBO-PON system, there are two wavelength sub-channels for the GPON uplink wavelength (1290-1310nm) and the 10G-PON uplink wavelength (1260-1280nm). The uplink wavelengths of the sub-channels are spaced far apart, and the isolation between the uplink wavelengths is generally greater than 30dB.

[0005] like Figure 1 As shown, the 50G-PON system defines three selectable uplink wavelengths: UW1, UW2, and UW3. The 50G tri-mode COMBO-PON optical module has three wavelength sub-channels. Due to the need to support the coexistence of GPON, 10G PON, and 50G PON, and considering coexistence and ease of management, the uplink wavelength of the 50G-PON ONU will use the UW3 (1284-1288nm) wavelength. However, the GPON standard uses an uplink wavelength of 1290-1310nm. The 1288nm and 1290nm wavelengths are very close, and the filters cannot meet the 30dB isolation requirement. Fortunately, the center wavelength of the GPON uplink is generally greater than 1295nm, and it uses a DFB (Distributed Feed Back) laser. However, in many practically deployed GPON systems, the possibility of wavelengths smaller than 1295nm (compliant with the GPON standard) cannot be completely ruled out.

[0006] The current network contains a large number of EPON ONUs (Optical Network Units). Early deployed EPONONUs used FP (Fabry-Perot) lasers, not DFB lasers. This means that EPONONUs, FP lasers, and DFB lasers coexist in the current network. FP lasers are multimode, with an uplink wavelength of 1260-1360nm, which may interfere with the 1284nm-1288nm uplink wavelength of 50GPON.

[0007] Uplink wavelength interference can affect the performance of a COMBO-PON system, generally impacting receiver sensitivity and packet loss. Wavelength overlap can also affect ONU uplink / downlink connectivity. Therefore, detecting wavelength interference in a COMBO-PON system is a pressing issue that needs to be addressed. Summary of the Invention

[0008] This application provides a method and apparatus for detecting wavelength interference in a COMBO-PON system, which can solve the problem of how to detect wavelength interference in a COMBO-PON system.

[0009] In a first aspect, embodiments of this application provide a method for detecting wavelength interference in a COMBO-PON system, the detection method comprising:

[0010] For the two wavelength sub-channels to be detected, ensure that all first optical network units in the first wavelength sub-channel do not emit light;

[0011] Decrease the uplink optical signal detection threshold of the first wavelength sub-channel;

[0012] When an optical signal is detected in the uplink direction of the first wavelength sub-channel, there is interference between the uplink wavelengths of the two wavelength sub-channels.

[0013] In conjunction with the first aspect, in one embodiment, when there is interference between the uplink wavelengths of the two wavelength sub-channels, the method further includes the step of:

[0014] Turn off the lasers of all second optical network units under the second wavelength sub-channel;

[0015] The lasers of each second optical network unit are turned on sequentially, and a sufficiently large bandwidth is allocated;

[0016] When an optical signal is detected in the uplink direction of the first wavelength sub-channel, there is interference between the uplink wavelength of the second optical network unit that is activated at this time and the uplink wavelength of the first wavelength sub-channel.

[0017] In conjunction with the first aspect, in one implementation, the laser of the second optical network unit is turned off and on via operation and maintenance management messages or physical layer operation and maintenance management messages.

[0018] In conjunction with the first aspect, in one implementation, the method by which all first optical network units under the first wavelength sub-channel do not emit light is as follows:

[0019] The transmission of the downlink laser in the first wavelength sub-channel is shut down, the uplink bandwidth of all first optical network units is stopped or windowed, or the optical line terminal shuts down the emission of all first optical network units.

[0020] In conjunction with the first aspect, in one implementation, the optical signal in the uplink direction of the first wavelength sub-channel is determined by detecting the SD signal. When the SD signal is high, an optical signal is detected in the uplink direction of the first wavelength sub-channel.

[0021] In conjunction with the first aspect, in one implementation, the SD signal is latched by a MAC chip or external logic unit corresponding to the first wavelength sub-channel.

[0022] On the other hand, a detection system based on the wavelength interference detection method in the COMBO-PON system is provided, the detection system comprising:

[0023] The control unit is used to prevent all first optical network units under the first wavelength sub-channel from emitting light.

[0024] The adjustment unit is used to reduce the uplink optical signal detection threshold of the first wavelength sub-channel;

[0025] The detection unit is used to detect whether there is an optical signal in the uplink direction of the first wavelength sub-channel.

[0026] In conjunction with the first aspect, in one implementation, when the detection unit detects an optical signal, the control unit is further configured to turn off the lasers of all second network units under the second wavelength sub-channel; sequentially turn on the lasers of each second optical network unit and allocate a sufficiently large bandwidth;

[0027] When the detection unit detects an optical signal in the uplink direction of the first wavelength sub-channel, the uplink wavelength of the second optical network unit that is activated at this time interferes with the uplink wavelength of the first wavelength sub-channel.

[0028] In conjunction with the first aspect, in one embodiment, the detection system is installed on a service line card, the service line card includes a COMBO optical module, and the control unit disables all first optical network units under the first wavelength sub-channel by de-enabling the first wavelength sub-channel of the COMBO optical module;

[0029] The adjustment unit adjusts the uplink optical signal detection threshold of the first wavelength sub-channel through the I2C interface of the COMBO optical module.

[0030] In conjunction with the first aspect, in one embodiment, the service line card further includes a MAC chip corresponding to different PON modes, and the control unit controls the MAC chip to turn off or on the laser of the second network unit under the second wavelength sub-channel via OAM message or PLOAM message.

[0031] The service line card also includes an external logic unit. The detection unit detects whether there is an optical signal in the uplink direction of the first wavelength sub-channel through a MAC chip or an external logic unit.

[0032] The beneficial effects of the technical solutions provided in this application include at least the following:

[0033] By preventing all first ONUs from emitting light in the first wavelength sub-channel of the two wavelength sub-channels to be detected, and then adjusting the uplink optical signal detection threshold of the first wavelength sub-channel, when an optical signal is detected in the uplink direction of the first wavelength sub-channel, interference between the uplink wavelengths of the two wavelength sub-channels in the COMBO-PON system can be detected. The detection method is simple.

[0034] By turning off the lasers of all second optical network units in the second wavelength sub-channel and then turning them on sequentially, when an optical signal is detected in the uplink direction of the first wavelength sub-channel, the uplink wavelength of the second ONU that is turned on at this time interferes with the uplink wavelength of the first wavelength sub-channel. Therefore, the specific second ONU exhibiting interference can be obtained even when interference exists.

[0035] Detecting a second ONU allows for further determination of whether it uses an FP laser, thus preparing for a smooth upgrade from EPON to 50G-EPON COMBO. In situations where the current network cannot guarantee that the uplink wavelength of GPON is less than 1295nm, this is used to determine whether existing GPON ONUs affect the deployment of 50G-PON COMBO, and to replace these low-probability second ONUs. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating the standard definition of the 50G-PON uplink wavelength in this application;

[0037] Figure 2 This is a schematic diagram of the wavelength interference detection method in the COMBO-PON system according to an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of a two-mode COMBO-PON system according to an embodiment of this application. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0041] At the OLT (Optical Line Terminal), the Combo-PON optical module carries signals from different PON mode MAC (Media Access Control) units through different wavelength sub-channels. For example, XG COMBO is carried by two wavelength sub-channels: one for GPON (upper and lower wavelengths) to carry signals from the GPON MAC unit, and the other for XG-PON (upper and lower wavelengths) to carry signals from the XG-PON MAC unit. The PMD (Physical Media Dependent) layer of the multimode MAC is coupled to the optical module through different SERDES interfaces. The COMBO-PON optical module has multiple transceiver modules and multiplexers / demultiplexers built in. In the downlink direction, the multiplexer combines optical signals of different wavelengths from multiple transceiver modules and sends them to the ODN (Optical Distribution Network); in the uplink direction, the demultiplexer demultiplexes multiple optical signals of different wavelengths from the ODN and sends them to the respective receiving modules. In other words, independent transmission of different modes of optical signals is achieved within the optical module through multiplexing and demultiplexing.

[0042] In a first aspect, embodiments of this application provide a method for detecting wavelength interference in a COMBO-PON system, which can detect whether wavelength interference exists in the COMBO-PON system.

[0043] like Figure 1 As shown, in one embodiment, the method for detecting wavelength interference in a COMBO-PON system includes the following steps:

[0044] S1. For the two wavelength sub-channels to be detected, ensure that all first ONUs under the first wavelength sub-channel do not emit light.

[0045] For ease of distinction, in this embodiment, the two wavelength sub-channels are referred to as the first wavelength sub-channel and the second wavelength sub-channel, respectively. The ONUs under the first wavelength sub-channel are called the first ONUs, and the ONUs under the second wavelength sub-channel are called the second ONUs. Typically, the high-speed PON to be upgraded is used as the first wavelength to check for interference from existing low-speed ONUs in the network. Therefore, the first wavelength sub-channel generally adopts the wavelength sub-channel used in the evolution and upgrade of the COMBO-PON system. For example, if the existing network needs to be upgraded to 50GPON, then the first wavelength sub-channel carries the wavelength of 50GPON.

[0046] S2. Reduce the uplink optical signal detection threshold SDA (Signal Detect Assert) of the first wavelength sub-channel so that weaker light signals can be detected.

[0047] S3. Determine whether an optical signal is detected in the uplink direction of the first wavelength sub-channel. If yes, proceed to S5; otherwise, proceed to S4.

[0048] S4. This indicates that the uplink wavelengths of the currently online second ONUs in the second wavelength sub-channel do not interfere with the uplink wavelengths of the first wavelength sub-channel. These online second ONUs can be added to a whitelist, and detection can be terminated, restoring the original uplink optical signal detection threshold SDA. The uplink wavelengths of these whitelisted second ONUs do not interfere with the uplink wavelengths of the first wavelength sub-channel.

[0049] S5. This indicates that there is interference between the uplink wavelengths of the two wavelength sub-channels. In other words, the uplink wavelength of at least one second ONU currently online in the second wavelength sub-channel interferes with the uplink wavelength of the first wavelength sub-channel, and the isolation between the wavelengths is not up to standard.

[0050] In step S1 above, there are several ways to prevent all first ONUs from emitting light under the first wavelength sub-channel. These include shutting down the transmission of the downlink laser in the first wavelength sub-channel, stopping or opening up the uplink bandwidth for all first ONUs, or the OLT shutting down the emission of all first ONUs. Specifically, the OLT shuts down the emission of all first ONUs by using an OAM (Operation Administration and Maintenance) message or a PLOAM (Physical Layer Operations, Administration and Maintenance) message to disable uplink emission from all first ONUs.

[0051] The above detection method can be used in both two-mode and three-mode COMBO-PON systems, as the detection principle is the same. When used in a three-mode COMBO-PON system, wavelength sub-channels of two modes can be detected at a time, and these two wavelength sub-channels are used as the two wavelength sub-channels to be detected.

[0052] When interference exists between the uplink wavelengths of two wavelength sub-channels, it is possible to further detect which ONUs in the second wavelength sub-channel have uplink wavelengths that interfere with the first wavelength sub-channel. Therefore, an embodiment for detecting interfering second ONUs is provided. This detection step can be performed as step S6 after step S5 is completed, specifically including:

[0053] First, disable the laser transmission of all second ONUs under the second wavelength sub-channel. Then, sequentially enable the laser of each second ONU under the second wavelength sub-channel, allocating a sufficiently large bandwidth. Each time a second ONU's laser is enabled, check if an optical signal is detected in the uplink direction of the first wavelength sub-channel. If so, it indicates interference between the uplink wavelength of the enabled second ONU and the uplink wavelength of the first wavelength sub-channel. This second ONU can be added to the blacklist and reported to the network management system for further evaluation and action, such as whether replacement or a smooth upgrade to the next-generation ONU is needed. If not, it indicates no interference between the uplink wavelength of the enabled second ONU and the uplink wavelength of the first wavelength sub-channel. This second ONU is then added to the whitelist. The same evaluation process is then repeated for the next second ONU.

[0054] During the above process, turning the laser of the second ONU on and off can be done via OAM or PLOAM messages. Allocating a sufficiently large bandwidth to each activated second ONU means that the uplink ONU burst emission time is long, making interference easier to detect.

[0055] In the above embodiment, the presence of an optical signal in the uplink direction of the first wavelength sub-channel is determined by detecting the SD signal; a high level indicates the presence of light, and a low level indicates the absence of light. When the SD signal is high, an optical signal is detected in the uplink direction of the first wavelength sub-channel. Furthermore, this SD signal is typically latched by the MAC chip or external logic unit corresponding to the first wavelength sub-channel.

[0056] Secondly, this application also proposes a wavelength interference detection system in a COMBO-PON system to implement the above-mentioned detection method. This detection system can be installed on a COMBO-PON service line card and includes a control unit, an adjustment unit, and a detection unit.

[0057] The control unit is used to prevent all first ONUs from emitting light under the first wavelength sub-channel.

[0058] The adjustment unit is used to reduce the uplink optical signal detection threshold SDA of the first wavelength sub-channel in order to detect weaker optical signals.

[0059] The detection unit is used to detect whether there is an optical signal in the uplink direction of the first wavelength sub-channel. If there is an optical signal, it means that there is interference between the uplink wavelengths of the two wavelength sub-channels; if there is no optical signal, it means that there is no interference between the uplink wavelength of the currently online second ONU and the uplink wavelength of the first wavelength sub-channel.

[0060] When interference exists in the uplink wavelength, an embodiment for detecting ONUs exhibiting uplink wavelength interference is further provided. In this embodiment, the control unit is also used to turn off the lasers of all second ONUs under the second wavelength sub-channel, sequentially turn on the lasers of each second optical ONU, and allocate a sufficiently large bandwidth. When the detection unit detects an optical signal in the uplink direction of the first wavelength sub-channel, the uplink wavelength of the turned-on second ONU interferes with the uplink wavelength of the first wavelength sub-channel.

[0061] Thirdly, this application will be further described in detail through an embodiment of a two-mode COMBO-PON system. For example... Figure 3 As shown, the COMBO-PON system has two uplink wavelengths and two downlink wavelengths, namely, the first uplink wavelength U1, the second uplink wavelength U2, the first downlink wavelength D1, and the second downlink wavelength D2. The COMBO-PON service line card includes a COMBO optical module and a MAC chip corresponding to each PON mode. In this embodiment, it consists of a first MAC chip (PON_MAC_1) and a second MAC chip (PON_MAC_2). The aforementioned detection system (not shown in the figure) is also installed on the COMBO-PON service line card.

[0062] like Figure 3 As shown, in this embodiment, the COMBO optical module has two wavelength sub-channels. The first wavelength sub-channel is equipped with a first MAC transceiver module (MAC_1 transceiver module), and the second wavelength sub-channel is equipped with a second MAC transceiver module (MAC_2 transceiver module). It is assumed that the first uplink wavelength U1 (e.g., 50G uplink 1284-1288nm) and the second uplink wavelength U2 (e.g., EPON uplink 1260-1360nm or GPON uplink 1290-1310nm) may overlap or have a very small interval. The specific detection method is as follows:

[0063] The detection system enables the first wavelength sub-channel, thus disabling it. Therefore, all first ONUs (ONU1 to ONU2) under the first wavelength sub-channel will be affected. iThe light will not be emitted, and no ONU will be online, but the uplink detection amplification link of the COMBO optical module on the COMBO-PON service line card will function normally. The second ONU (ONU) under the second wavelength sub-channel... i+1 To ONU n It is working normally.

[0064] Enabling the first wavelength sub-channel can be achieved through the control unit of the detection system in several ways. These methods include shutting down the transmission of the downlink laser of the first wavelength sub-channel, stopping or opening the uplink bandwidth of all first ONUs by the first MAC chip, or controlling the control unit to control the first MAC chip to disconnect all first ONUs through OAM or PLOAM messages, so that the ONUs do not emit light uplink.

[0065] The adjustment unit of the detection system adjusts the detection threshold SDA of the uplink wavelength U1 optical signal of the first wavelength sub-channel via the I2C interface of the COMBO optical module. Since the detection threshold SDA is relatively large when the optical module is working normally, it needs to be adjusted during the detection process.

[0066] Generally, a COMBO optical module has multiple SD signals that connect to the external device interface via the gold fingers. Each SD signal represents whether an optical signal has been detected in the uplink direction of the wavelength sub-channel of the COMBO optical module. This SD signal is usually sent to the MAC chip or external logic unit corresponding to the wavelength sub-channel for latching. When the SD signal is high, it indicates that there is interference between the uplink wavelengths of the two wavelength sub-channels; when the SD signal is low, it indicates that there is interference between the uplink wavelengths of the two wavelength sub-channels.

[0067] In this embodiment, the detection unit detects whether there is a high-level SD signal (i.e., SD1) in the uplink direction of the first wavelength sub-channel through a MAC chip or external logic unit. If SD1 is detected, it indicates that there is interference between the second uplink wavelength U2 and the first uplink wavelength U1, and the isolation is not up to standard. If SD1 is not detected, it indicates that there is no interference between the second uplink wavelength U2 and the first uplink wavelength U1 of the currently online second ONU. These online second ONUs are added to the system whitelist, representing that there is no interference between the second uplink wavelength U2 and the first uplink wavelength U1 of these second ONUs.

[0068] When there is interference between the second uplink wavelength U2 and the first uplink wavelength U1, it is possible to further detect which second ONUs in the second wavelength sub-channel do not have interference between their second uplink wavelength U2 and the first uplink wavelength U1.

[0069] The detection method for the second ONU is as follows: the control unit shuts down the transmission of all second ONU lasers under the normally operating second wavelength sub-channel and clears the SD1 flag on the corresponding MAC chip (PON_MAC_1) or external logic unit.

[0070] If the second wavelength sub-channel is an EPON type sub-channel, the laser transmission of all second ONUs in that sub-channel is shut down via an OAM message. If the second wavelength sub-channel is a GPON type sub-channel, the laser transmission of all second ONUs in that sub-channel is shut down via a PLOAM message.

[0071] Then, in the second wavelength sub-channel, the corresponding MAC chip (PON_MAC_2) is sequentially controlled to turn on the laser of the second ONU on that sub-channel via OAM message (corresponding to EPON type) or PLOAM message (corresponding to GPON type) and allocate bandwidth. PON_MAC_2 turns on and activates only one second ONU at a time and allocates a sufficiently large uplink bandwidth to that second ONU.

[0072] After allocating sufficient bandwidth, if SD1 is not detected in PON_MAC_1 or the external logic unit, it indicates that there is no interference between the second uplink wavelength U2 and the first uplink wavelength U1 of the second ONU, and the second ONU is added to the whitelist. If SD1 is detected in PON_MAC_1 or the external logic unit, it indicates that there is interference between the second uplink wavelength U2 and the first uplink wavelength U1 of the second ONU; the second ONU is added to the blacklist and reported to the network management system, and subsequent determination is made as to whether the second ONU needs to be replaced or smoothly upgraded to the next-generation ONU.

[0073] Additionally, if the second ONU needs to be replaced, it must be turned off before replacement using an OAM or PLOAM message to prevent it from emitting light. After replacement, the replaced second ONU should be removed from the blacklist. After testing, the SDA settings of the COMBO optical module must be restored via its I2C interface.

[0074] Within each detection cycle, the second wavelength sub-channel may contain ONUs that are not yet online or newly connected and discovered by the OLT for the first time. Once these ONUs come online, if the ONU is neither on the whitelist nor the blacklist, the detection process can be started from step S1 above. When interference is detected, it is not necessary to detect all the second ONUs under the second wavelength sub-channel. Second ONUs on the whitelist do not need to be detected again. It is only necessary to detect whether there is interference between the uplink wavelength U2 and the first wavelength U1 of the newly discovered or online ONU.

[0075] For 50G PON deployment, EPON and 50G PON coexist: Since EPON deployment has been in place for 20 years, it is impossible to identify which EPON ONUs use FP lasers. The above embodiments can identify certain EPON ONUs that use FP lasers that may cause interference. This prepares for a smooth upgrade from EPON to 50G-EPON COMBO.

[0076] For 50G PON deployment, GPON and 50G PON coexist: In cases where the existing network cannot fully guarantee that the uplink wavelength of GPON is less than 1295nm (the standard requirement is 1290-1310nm), the above embodiment provides a technical means to determine whether the existing GPON ONU affects the deployment of 50G-PON COMBO, and to replace these low-probability ONUs.

[0077] The above detection method can be used in 50G-PON systems, but is not limited to 50G-PON systems. As long as the uplink wavelengths of COMBO-PON are relatively close, the detection method in this application can be used.

[0078] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0079] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0080] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0081] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0082] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0083] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for detecting wavelength interference in a COMBO-PON system, characterized in that, The detection method includes: For the two wavelength sub-channels to be detected, ensure that all first optical network units in the first wavelength sub-channel do not emit light; Decrease the uplink optical signal detection threshold of the first wavelength sub-channel; When an optical signal is detected in the uplink direction of the first wavelength sub-channel, there is interference between the uplink wavelengths of the two wavelength sub-channels.

2. The method for detecting wavelength interference in a COMBO-PON system as described in claim 1, characterized in that, When there is interference between the uplink wavelengths of the two wavelength sub-channels, the following step is also included: Turn off the lasers of all second optical network units under the second wavelength sub-channel; The lasers of each second optical network unit are turned on sequentially, and a sufficiently large bandwidth is allocated; When an optical signal is detected in the uplink direction of the first wavelength sub-channel, there is interference between the uplink wavelength of the second optical network unit that is activated at this time and the uplink wavelength of the first wavelength sub-channel.

3. The method for detecting wavelength interference in a COMBO-PON system as described in claim 2, characterized in that: The laser of the second optical network unit is turned off and on via operation and maintenance management messages or physical layer operation and maintenance management messages.

4. The method for detecting wavelength interference in a COMBO-PON system as described in claim 1, characterized in that, The method to prevent all first optical network units in the first wavelength sub-channel from emitting light is as follows: The transmission of the downlink laser in the first wavelength sub-channel is shut down, the uplink bandwidth of all first optical network units is stopped or windowed, or the optical line terminal shuts down the emission of all first optical network units.

5. The method for detecting wavelength interference in a COMBO-PON system as described in any one of claims 1-4, characterized in that: The optical signal in the uplink direction of the first wavelength sub-channel is determined by detecting the SD signal. When the SD signal is high, an optical signal is detected in the uplink direction of the first wavelength sub-channel.

6. The method for detecting wavelength interference in a COMBO-PON system as described in claim 5, characterized in that: The SD signal is latched by the MAC chip or external logic unit corresponding to the first wavelength sub-channel.

7. A detection system based on the wavelength interference detection method in the COMBO-PON system according to claim 1, characterized in that, The detection system includes: The control unit is used to prevent all first optical network units under the first wavelength sub-channel from emitting light. The adjustment unit is used to reduce the uplink optical signal detection threshold of the first wavelength sub-channel; The detection unit is used to detect whether there is an optical signal in the uplink direction of the first wavelength sub-channel.

8. The detection system as described in claim 7, characterized in that: When the detection unit detects an optical signal, the control unit is also used to turn off the lasers of all second network units under the second wavelength sub-channel; turn on the lasers of each second optical network unit in sequence, and allocate a sufficiently large bandwidth; When the detection unit detects an optical signal in the uplink direction of the first wavelength sub-channel, the uplink wavelength of the second optical network unit that is activated at this time interferes with the uplink wavelength of the first wavelength sub-channel.

9. The detection system as described in claim 7 or 8, characterized in that: The detection system is installed on the service line card, which includes a COMBO optical module. The control unit disables the first wavelength sub-channel of the COMBO optical module, causing all first optical network units under the first wavelength sub-channel to stop emitting light. The adjustment unit adjusts the uplink optical signal detection threshold of the first wavelength sub-channel through the I2C interface of the COMBO optical module.

10. The detection system as described in claim 9, characterized in that: The service line card also includes a MAC chip corresponding to different PON modes. The control unit controls the MAC chip to turn off or on the laser of the second network unit under the second wavelength sub-channel via OAM message or PLOAM message. The service line card also includes an external logic unit. The detection unit detects whether there is an optical signal in the uplink direction of the first wavelength sub-channel through a MAC chip or an external logic unit.

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