Passive optical network and wavelength configuration method

Abstract

The application provides a passive optical network and a wavelength configuration method. The passive optical network comprises an optical line terminal and K user terminal devices. The optical line terminal comprises an arrayed waveguide grating and M optical modules. Each optical module comprises a microcontroller and N dense wavelength division multiplexing bidirectional optical components. The microcontroller is configured to configure a transmission wavelength and a receiving wavelength for each dense wavelength division multiplexing bidirectional optical component in the M optical modules based on the transmission wavelength and the receiving wavelength supported by the arrayed waveguide grating. The technical solution of the application enables the user terminal devices to be connected with the optical fiber at will, brings great convenience to field network deployment, and reduces the error probability.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a passive optical network and a wavelength configuration method. Background Technology

[0002] Ethernet optical access technology refers to Ethernet fiber optic access based on point-to-point (P2P) or point-to-multipoint (P2MP, but using active aggregation) transmission, directly transmitting Ethernet frames through the fiber optic medium. For example, a typical architecture of Ethernet optical access technology is P2P direct fiber connection, where each port of the operator's data center switch (or router) is directly connected to a single user device (such as a router) via an independent fiber optic cable. Another typical architecture of Ethernet optical access technology is P2MP active aggregation, which aggregates data through active optical splitters or switches, but each user port still maintains a logical "lease line" to the aggregation device. Ethernet optical access technology uses MAC addresses for addressing and forwarding, with each user having dedicated port bandwidth and symmetrical uplink and downlink bandwidth.

[0003] PON (Passive Optical Network) is a point-to-multipoint fiber optic access technology. A PON consists of an OLT (Optical Line Terminal) and user terminal equipment, which is either an ONU (Optical Network Unit) or an ONT (Optical Network Terminal). In a PON, there are no active electronic devices in the ODN (Optical Distribution Network) between the OLT and the user terminal equipment; only passive optical splitters are used, thus reducing maintenance costs and potential points of failure.

[0004] Compared to Ethernet optical access technology, passive optical networks (PONs) offer advantages such as high cost-effectiveness, high bandwidth, and ease of management and maintenance, leading to their widespread adoption. High cost-effectiveness refers to the significant savings in fiber optic and equipment room resources achieved through passive splitting, while simultaneously covering a large number of users and resulting in low long-term operation and maintenance costs. High bandwidth means that shared bandwidth can meet the broadband needs of most residential and business users. Ease of management and maintenance refers to support for robust OAM (Operations Administration and Maintenance) functions, enabling remote management and fault diagnosis.

[0005] Although passive optical networks are widely used, they still have problems such as consuming a large amount of optical fiber resources, significant optical power attenuation, and limited transmission distance. Summary of the Invention

[0006] This application provides a passive optical network, which includes an optical line terminal and K user terminal devices. The optical line terminal includes an arrayed waveguide grating and M optical modules, and the M optical modules are connected to the arrayed waveguide grating. Each optical module includes a microcontroller and N dense wavelength division multiplexing bidirectional optical components. The arrayed waveguide grating supports at least K transmit wavelengths and K receive wavelengths. K is determined based on the product of M and N, and K, M, and N are all greater than 1. The microcontroller is configured to configure the transmit and receive wavelengths for each dense wavelength division multiplexing bidirectional optical component in the optical module based on the transmit and receive wavelengths supported by the arrayed waveguide grating. Specifically, for each user terminal device, the user terminal device configures the transmission wavelength and reception wavelength of its optical module based on the transmission wavelength and reception wavelength supported by the arrayed waveguide grating, so that the dense wavelength division multiplexing bidirectional optical components in the M optical modules match the wavelengths of the optical modules of the K user terminal devices.

[0007] This application provides a wavelength configuration method based on a passive optical network (PON). The PON includes an optical line terminal (OLT) and K user terminal devices. The OLT includes an arrayed waveguide grating (AWR) and M optical modules, with the M optical modules connected to the AWR. Each optical module includes a microcontroller and N dense wavelength division multiplexing (DWDM) bidirectional optical components. The AWR supports at least K transmit wavelengths and K receive wavelengths. K is determined based on the product of M and N, where K, M, and N are all greater than 1. The method is applied to the microcontroller of the optical modules, and the method includes: Based on the transmit and receive wavelengths supported by the arrayed waveguide grating, each dense wavelength division multiplexing bidirectional optical component in the optical module is configured with a transmit and receive wavelength.

[0008] As can be seen from the above technical solutions, in this embodiment, the passive optical network includes an optical line terminal (OLT) and K user terminal devices. The OLT includes an arrayed waveguide grating (AWR) and M optical modules. Each optical module includes a microprocessor and N dense wavelength division multiplexing (DWDM) bidirectional optical components. The AWR supports at least K transmit wavelengths and K receive wavelengths. The microprocessor configures the transmit and receive wavelengths for each DWDM bidirectional optical component in the optical module based on the transmit and receive wavelengths supported by the AWR. The user terminal devices configure the transmit and receive wavelengths for their own optical modules based on the transmit and receive wavelengths supported by the AWR, so that the wavelengths of the DWDM bidirectional optical components in the M optical modules match the wavelengths of the optical modules in the K user terminal devices. In the above approach, based on the transmit and receive wavelengths supported by the arrayed waveguide grating, the transmit and receive wavelengths of the dense wavelength division multiplexing (DWDM) bidirectional optical components are configured. This achieves a passive optical network where there is no one-to-one wavelength correspondence between optical modules and optical power dividers. That is, it is not necessary to pre-configure the transmit and receive wavelengths of the DWDM bidirectional optical components for each optical module; instead, the transmit and receive wavelengths of the DWDM bidirectional optical components for each optical module are configured according to actual needs during use. This allows user terminal equipment to be freely connected to optical fibers, greatly facilitating on-site network deployment, saving labor and time, and reducing the probability of errors. By adopting a single-fiber deployment method and utilizing optical power dividers, not only is dedicated bandwidth achieved, but wavelength is also imperceptible. The optical modules of user terminal equipment can be freely connected to the ports of the optical power divider, saving fiber resources, reducing optical power attenuation, increasing transmission distance, and solving problems such as occupying large amounts of fiber resources, significant optical power attenuation, and limited transmission distance. Attached Figure Description

[0009] Figure 1A This is a schematic diagram of the structure of a passive optical network in one embodiment of this application; Figure 1B This is a schematic diagram of the structure of a passive optical network in one embodiment of this application; Figure 2A This is a schematic diagram of the structure of a passive optical network in one embodiment of this application; Figure 2B This is a schematic diagram of the structure of a passive optical network in one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a passive optical network in one embodiment of this application; Figure 4A This is a schematic diagram of the structure of an optical line terminal according to one embodiment of this application; Figure 4B This is a schematic diagram of the structure of the optical module of the optical line terminal in one embodiment of this application; Figure 4CThis is a schematic diagram of an ELSFP-type optoelectronic hybrid interface in one embodiment of this application; Figure 4D This is a schematic diagram of an ELSFP-type optoelectronic hybrid interface in one embodiment of this application; Figure 5 This is a flowchart of a wavelength configuration method based on a passive optical network according to one embodiment of this application. Detailed Implementation

[0010] This application proposes a passive optical network in its embodiments; see [link to relevant documentation]. Figure 1A The diagram shows the structure of a passive optical network (PON). The PON may include an optical line terminal (OLT) 11 and K user terminal devices (HATs) 12. The OLT may include an arrayed waveguide grating (AWR) 110 and M optical modules 111, with the M HATs connected to the AWR 110. Each HAT 111 may include N dense wavelength division multiplexing (DWDM) bidirectional optical components 112, meaning that for each HAT 111, it may include N DWDM bidirectional optical components 112. The AWR 110 supports at least K transmit wavelengths and K receive wavelengths, and each HAT 111 also supports K transmit wavelengths and K receive wavelengths, meaning that for each HAT 111, it supports K transmit wavelengths and K receive wavelengths. For example, K is determined based on the product of M and N, where K, M, and N are all positive integers greater than 1.

[0011] In one example, for each optical module 111, the optical module 111 may also include a microcontroller for configuring the transmit wavelength and receive wavelength for each dense wavelength division multiplexing bidirectional optical component 112 in the optical module 111 based on the transmit wavelength and receive wavelength supported by the arrayed waveguide grating 110.

[0012] Furthermore, for each user terminal device, the user terminal device (such as the optical module of the user terminal device) can configure the transmission wavelength and reception wavelength of the optical module of the user terminal device based on the transmission wavelength and reception wavelength supported by the arrayed waveguide grating 110, so that the dense wavelength division multiplexing bidirectional optical component 112 in the M optical modules 111 matches the wavelength of the optical modules of the K user terminal devices.

[0013] In one example, the arrayed waveguide grating includes K output ports and K input ports. The K output ports correspond one-to-one with K dense wavelength division multiplexing (DWDM) bidirectional optical components in M ​​optical modules, and the K input ports correspond one-to-one with the K DWDM bidirectional optical components in the M optical modules. Based on this, a microcontroller configures the transmission wavelength for each DWDM bidirectional optical component based on the transmission wavelength supported by its corresponding output port; and configures the reception wavelength for each DWDM bidirectional optical component based on the reception wavelength supported by its corresponding input port.

[0014] In one example, the microcontroller can be such as an MCU (Microcontroller Unit). The microcontroller acquires control signals including transmit wavelength information from the output port of the arrayed waveguide grating and receive wavelength information from the input port of the arrayed waveguide grating. The microcontroller determines, based on the transmit wavelength information of the output port, the transmit wavelength supported by the output port of the dense wavelength division multiplexing (DWDM) bidirectional optical component, and configures the transmit wavelength for the DWDM bidirectional optical component; it also determines, based on the receive wavelength information of the input port, the receive wavelength supported by the input port of the DWDM bidirectional optical component, and configures the receive wavelength for the DWDM bidirectional optical component.

[0015] In one example, for each user terminal device, the user terminal device includes an optical module that supports at least K transmit wavelengths and K receive wavelengths; the arrayed waveguide grating includes K output ports and K input ports, with each of the K output ports corresponding one-to-one with the optical modules of the K user terminal devices, and each of the K input ports corresponding one-to-one with the optical modules of the K user terminal devices. For each user terminal device's optical module, the optical module configures the receive wavelength for the user terminal device based on the transmit wavelengths supported by the corresponding output port; for each user terminal device's optical module, the optical module configures the transmit wavelength for the user terminal device based on the receive wavelengths supported by the corresponding input port.

[0016] In one example, see Figure 1BThe diagram shows a schematic of a passive optical network (PON). The PON may further include an optical power splitter 13 located between the optical line terminal 11 and the user terminal equipment 12. The optical power splitter 13 is connected to the optical line terminal 11 via a single optical fiber, and to the K user terminal equipment 12 via K optical fibers, with each of the K optical fibers corresponding one-to-one with the K user terminal equipment. Based on this, for each user terminal equipment, the optical power splitter transmits signals to that user terminal equipment via a single optical fiber; the optical power splitter also transmits signals to the optical line terminal via a single optical fiber.

[0017] In one example, an optical line terminal (OLT) may include M optoelectronic hybrid interfaces, each corresponding one-to-one with one of the M optical modules. These M optoelectronic hybrid interfaces may also correspond to arrayed waveguide gratings (AWGs). For each optical module, it is inserted into its corresponding optoelectronic hybrid interface to connect it to the WAG and transmit signals. Specifically, when an OLT optical module sends a first signal to a user terminal device's optical module, the WAG receives the first signal and sends it back to the user terminal device's optical module. Similarly, when a user terminal device's optical module sends a second signal to the OLT optical module, the WAG receives the second signal and sends it back to the OLT optical module.

[0018] In one example, for each optical module of the optical line terminal, the optical module may include N dense wavelength division multiplexing bidirectional optical components, a microcontroller, a first optical interface, and a first electrical interface; the first optical interface may include a first mechanical pair transmission ferrule, and the first electrical interface may include a first gold-plated contact array; wherein, each dense wavelength division multiplexing bidirectional optical component of the optical module is connected to the first optical interface, and by inserting the first optical interface into the optoelectronic hybrid interface corresponding to the optical module, the dense wavelength division multiplexing bidirectional optical components of the optical module can transmit signals with the arrayed waveguide grating; wherein, the first gold-plated contact array may be a single-sided double-layer gold-plated contact array, and the single-sided double-layer gold-plated contact array may be a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optical module.

[0019] In one example, the optoelectronic hybrid interface includes a second optical interface and a second electrical interface. The second optical interface includes a second mechanical pair transmission ferrule, and the second electrical interface includes a second gold-plated contact array. The second gold-plated contact array is a single-sided double-layer gold-plated contact array, which is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optoelectronic hybrid interface.

[0020] In one example, for each optical module, the optical module may include, but is not limited to, an OSFP-XD optical module or an OSFP optical module; there is no limitation in this regard. M optical modules may include 4 optical modules; N dense wavelength division multiplexing bidirectional optical components may include 8 dense wavelength division multiplexing bidirectional optical components; K transmit wavelengths and K receive wavelengths may include 32 transmit wavelengths and 32 receive wavelengths.

[0021] As can be seen from the above technical solutions, in this embodiment, the passive optical network includes an optical line terminal (OLT) and K user terminal devices. The OLT includes an arrayed waveguide grating (AWR) and M optical modules. Each optical module includes a microprocessor and N dense wavelength division multiplexing (DWDM) bidirectional optical components. The AWR supports at least K transmit wavelengths and K receive wavelengths. The microprocessor configures the transmit and receive wavelengths for each DWDM bidirectional optical component in the optical module based on the transmit and receive wavelengths supported by the AWR. The user terminal devices configure the transmit and receive wavelengths for their own optical modules based on the transmit and receive wavelengths supported by the AWR, so that the wavelengths of the DWDM bidirectional optical components in the M optical modules match the wavelengths of the optical modules in the K user terminal devices. In the above approach, based on the transmit and receive wavelengths supported by the arrayed waveguide grating, the transmit and receive wavelengths of the dense wavelength division multiplexing (DWDM) bidirectional optical components are configured. This achieves a passive optical network where there is no one-to-one wavelength correspondence between optical modules and optical power dividers. That is, it is not necessary to pre-configure the transmit and receive wavelengths of the DWDM bidirectional optical components for each optical module; instead, the transmit and receive wavelengths of the DWDM bidirectional optical components for each optical module are configured according to actual needs during use. This allows user terminal equipment to be freely connected to optical fibers, greatly facilitating on-site network deployment, saving labor and time, and reducing the probability of errors. By adopting a single-fiber deployment method and utilizing optical power dividers, not only is dedicated bandwidth achieved, but wavelength is also imperceptible. The optical modules of user terminal equipment can be freely connected to the ports of the optical power divider, saving fiber resources, reducing optical power attenuation, increasing transmission distance, and solving problems such as occupying large amounts of fiber resources, significant optical power attenuation, and limited transmission distance.

[0022] The technical solutions described above in the embodiments of this application will be explained below in conjunction with specific application scenarios.

[0023] Ethernet optical access technology refers to Ethernet fiber optic access based on point-to-point (P2P) or point-to-multipoint (P2MP, but with active aggregation), which directly transmits Ethernet frames through the fiber optic medium.

[0024] Passive optical networks (PONs) are a point-to-multipoint fiber optic access technology. A PON includes optical line terminals (OLTs) and user terminal equipment (ONTs). In a PON, there are no active electronic devices in the optical distribution network between the OLT and the user terminal equipment; only passive optical splitters are used, thereby reducing maintenance costs and points of failure.

[0025] The Optical Line Terminal (OLT) is located in the operator's equipment room and serves as the root node and control center of the passive optical network (PON). The optical distribution network, composed of optical fibers and passive splitters, is responsible for broadcasting downlink signals to all users and aggregating uplink signals to the OLT. User terminal equipment (optical network unit or optical network terminal) is located on the user side. Optical network units can be used for enterprises (multi-user), while optical network terminals can be used for homes (single-user).

[0026] In a passive optical network (PON), taking GPON (Gigabit-Capable Passive Optical Network) as an example, the downlink can broadcast signals. The signal transmitted by the optical line terminal (OLT) is replicated to all user terminal equipment (HTAs) through an optical splitter. Each HTA selectively receives data belonging to its own user terminal equipment based on its GEM Port ID (GPON Encapsulation Method Port Identifier). The uplink uses TDMA (Time Division Multiple Access) to transmit signals. Under the unified scheduling of the OLT, all HTAs transmit data within their respective allocated time slots to avoid collisions.

[0027] Compared to Ethernet optical access technology, passive optical networks (PONs) offer advantages such as high cost-effectiveness, high bandwidth, and ease of management and maintenance. High cost-effectiveness means that passive splitting saves significant fiber optic and equipment room resources, covers a large number of users, and has low long-term operation and maintenance costs. High bandwidth means that shared bandwidth can meet the broadband needs of most home and business users. Ease of management and maintenance means that it supports OAM (Operational Access Management) functions, enabling remote management and fault diagnosis.

[0028] For example, the topology of a passive optical network (PON) is point-to-multipoint (P2MP), employing passive splitting; while the topology of Ethernet optical access technology is point-to-point (P2P), employing active aggregation. The bandwidth of a PON is shared (the port bandwidth of the optical line terminal is shared by all connected users); the bandwidth of Ethernet optical access technology is dedicated (the user port bandwidth is completely dedicated). The technical protocol of a PON is a proprietary protocol (GTC encapsulation, etc.), requiring specific user terminal equipment (ONU / ONT); the technical protocol of Ethernet optical access technology is standard Ethernet (IEEE 802.3), with strong interface universality. Based on these characteristics, PONs have high coverage efficiency and are suitable for high-density user areas (such as residential areas); PONs are easy to operate and maintain, and have high reliability. Ethernet optical access technology offers dedicated and symmetrical bandwidth, with absolutely guaranteed performance; Ethernet optical access technology can achieve low latency and low jitter, with a deterministic path.

[0029] Typical application scenarios for passive optical networks include: large-scale fiber to the home (FTTH), broadband access for small and medium-sized enterprises, mobile fronthaul / backhaul, and smart park access layer.

[0030] Although passive optical networks are widely used, they still have problems such as consuming a large amount of optical fiber resources, significant optical power attenuation, and limited transmission distance.

[0031] In one example, see Figure 2A The diagram shows the structure of a passive optical network (PON). A PON includes an optical line terminal (OLT), a WDM (Wavelength Division Multiplexing) demultiplexer, and user terminal equipment. The WDM demultiplexer can also be replaced by an optical power splitter. The WDM demultiplexer splits light according to wavelength (color), with different colors of light going through different channels. The optical power splitter splits light according to optical power (energy), dividing a beam of light into multiple beams of equal energy, all of which are the same color.

[0032] exist Figure 2A In this example, we will use the optical module of the optical line terminal supporting eight wavelengths as an example. That is, the optical module supports the transmission wavelength. λ1 and receiving wavelength λ9 The transmit wavelength can also be called the TX wavelength, and the receive wavelength can also be called the RX wavelength. Optical modules support transmit wavelengths. λ2 and receiving wavelength λ10 The optical module supports emission wavelengths λ3 and receiving wavelength λ11 The optical module supports emission wavelengths λ4 and receiving wavelength λ12 The optical module supports emission wavelengths λ5 and receiving wavelength λ13 The optical module supports emission wavelengths λ6 and receiving wavelength λ14 The optical module supports emission wavelengths λ7 and receiving wavelength λ15 The optical module supports emission wavelengths λ8 and receiving wavelength l 16 .

[0033] To work with optical line terminals (OLTs), WDM splitters / multiplexers connect to the OLT's optical module via a single fiber (single optical fiber), and the WDM splitter / multiplexer also needs to support eight wavelengths, such as the transmit wavelength. λ1 and receiving wavelength λ9 emission wavelength λ2 and receiving wavelength λ10 emission wavelength λ3 and receiving wavelength λ11 emission wavelength λ4 and receiving wavelength λ12 emission wavelength λ5 and receiving wavelength λ13 emission wavelength λ6 and receiving wavelength λ14 emission wavelength λ7 and receiving wavelength λ15 emission wavelength l 8 and receiving wavelength λ16 .

[0034] To coordinate with the optical line terminal (OLT), when the OLT's optical modules support eight wavelengths, the eight wavelengths of the OLT can correspond to eight user terminal devices. Each user terminal device can correspond to one optical module, denoted as optical module 1, optical module 2, ..., optical module 7, optical module 8. Optical module 1 supports receiving wavelengths... λ1 and emission wavelength λ9 That is, the receiving wavelength of optical module 1 λ1 With the emission wavelength of the optical line terminal λ1 Similarly, the emission wavelength of optical module 1 λ9 With the receiving wavelength of the optical line terminal l 9 Same. Furthermore, optical module 2 supports receiving wavelengths. λ2 and emission wavelength λ10 Optical module 3 supports receiving wavelengths λ3 and emission wavelength λ11 Optical module 4 supports receiving wavelengths λ4 and emission wavelength λ12 Optical module 5 supports receiving wavelengths λ5 and emission wavelength λ13 Optical module 6 supports receiving wavelengths λ6 and emission wavelength λ14 Optical module 7 supports receiving wavelengths λ7 and emission wavelength λ15 Optical module 8 supports receiving wavelengths λ8 and emission wavelength λ16 .

[0035] To realize the above passive optical network, the eight wavelengths of the optical line terminal need to be, in order: transmit wavelength... λ1 (received wavelength) λ9 ), emission wavelength λ2 (received wavelength) λ10 ), emission wavelength λ3 (received wavelength) λ11 ), emission wavelength λ4 (received wavelength) l 12 ), emission wavelength λ5 (received wavelength) λ13 ), emission wavelength λ6 (received wavelength) λ14 ), emission wavelength λ7 (received wavelength) λ15 ), emission wavelength λ8 (received wavelength) λ16 ).

[0036] The first port of the WDM splitter / multiplexer needs to be configured with the transmit wavelength. λ1 (received wavelength) λ9 The optical module 1 connected to this port needs to be configured with a receiving wavelength. λ1 (Emission wavelength) λ9 That is, optical module 1 needs to strictly follow the receiving wavelength. λ1 (Emission wavelength) λ9 Signal transmission is performed using optical fibers, but optical modules of other wavelengths cannot be connected to the first port of the WDM splitter / multiplexer, and user terminal equipment cannot be arbitrarily connected to optical fibers.

[0037] The second port of the WDM splitter / multiplexer needs to be configured with the transmit wavelength. λ2 (received wavelength) λ10 The optical module 2 connected to this port needs to be configured with a receiving wavelength. λ2 (Emission wavelength) λ10 ).

[0038] The third port of the WDM splitter / multiplexer needs to be configured with the transmit wavelength. λ3 (received wavelength) λ11 The optical module 3 connected to this port needs to be configured with a receiving wavelength. λ3 (Emission wavelength) λ11 ).

[0039] Similarly, the 8th port of the WDM multiplexer needs to be configured with the transmit wavelength. λ8 (received wavelength) λ16 The optical module 8 connected to this port needs to be configured with a receiving wavelength. λ8 (Emission wavelength) λ16 ).

[0040] In the aforementioned passive optical network, 16 wavelengths of CWDM (Coarse Wavelength Division Multiplexing) or DWDM (Dense Wavelength Division Multiplexing) are used. One near-end optical module (i.e., the optical line terminal module) integrates 8 transmit wavelengths. The built-in multiplexer combines the transmit light from the 8 transmit wavelengths into one path, which is then transmitted to a WDM demultiplexer via a single optical fiber. The WDM demultiplexer splits the single transmit light into 8 transmit wavelengths and distributes them to the corresponding far-end optical modules, i.e., the 8 far-end optical modules of each user terminal equipment.

[0041] Each of the eight remote optical modules has one transmit wavelength. The WDM multiplexer combines the received light from the eight receive wavelengths (receive wavelengths for the near-end optical module and transmit wavelengths for the remote optical module) into one path, which is then transmitted to the near-end optical module through a single optical fiber. The near-end optical module uses its built-in demultiplexer to decode the single receive light into eight wavelength signals, which are then used for subsequent processing.

[0042] In the above processing, the near-end optical module has 8 transmit wavelengths (8 receive wavelengths), and each transmit wavelength of the near-end optical module corresponds to one bandwidth signal. Correspondingly, the far-end optical module also has 8 transmit wavelengths (8 receive wavelengths), so that each far-end optical module can enjoy one bandwidth exclusively.

[0043] In the above process, for each user terminal device, the WDM multiplexer and the optical module of the user terminal device transmit signals via dual fibers (dual optical fibers). For example, for each user terminal device, the WDM multiplexer sends signals to the optical module of the user terminal device through the first optical fiber, and the WDM multiplexer receives signals sent by the optical module of the user terminal device through the second optical fiber.

[0044] In the above process, due to the use of CWDM wavelength division multiplexing technology, each remote optical module and the wavelength on the WDM demultiplexer must correspond one-to-one and cannot be arbitrarily connected. Moreover, each remote optical module uses a dual-fiber interface, and each remote optical module requires two optical fibers for connection, which wastes a lot of optical fiber resources.

[0045] In one example, see Figure 2B The diagram shown is a schematic of a passive optical network (PON). A PON includes an optical line terminal (OLT), optical power splitter 1, optical power splitter 2, and user terminal equipment.

[0046] exist Figure 2B In this example, taking the optical module (i.e., the near-end optical module) at the optical line terminal as supporting two groups of eight wavelengths, for instance, the near-end optical module supports two groups of transmission wavelengths. λ1 and receiving wavelength λ9 2 sets of emission wavelengths λ2 and receiving wavelength λ10 2 sets of emission wavelengths λ3 and receiving wavelength λ11 2 sets of emission wavelengths λ4 and receiving wavelength λ12 2 sets of emission wavelengths λ5 and receiving wavelength λ13 2 sets of emission wavelengths λ6 and receiving wavelength λ14 2 sets of emission wavelengths λ7 and receiving wavelength λ15 2 sets of emission wavelengths λ8 and receiving wavelength λ16 .

[0047] To work with the optical line terminal, optical power splitter 1 is connected to the near-end optical module of the optical line terminal via a single fiber (single optical fiber). Optical power splitter 1 supports 8 wavelengths. Optical power splitter 2 is connected to the near-end optical module of the optical line terminal via a single fiber (single optical fiber). Optical power splitter 2 also supports 8 wavelengths.

[0048] For example, optical power divider 1 supports transmission wavelengths λ1 and receiving wavelength λ9 emission wavelength λ2 and receiving wavelength l 10 emission wavelength λ3 and receiving wavelength λ11 emission wavelength λ4 and receiving wavelength λ12 emission wavelength λ5 and receiving wavelength λ13 emission wavelength λ6 and receiving wavelength λ14 emission wavelength λ7 and receiving wavelength λ15 emission wavelength λ8 and receiving wavelength λ16 Similarly, optical power divider 2 also supports transmission wavelengths. λ1 and receiving wavelength λ9 emission wavelength λ2and receiving wavelength λ10 emission wavelength λ3 and receiving wavelength λ11 emission wavelength λ4 and receiving wavelength λ12 emission wavelength λ5 and receiving wavelength λ13 emission wavelength λ6 and receiving wavelength λ14 emission wavelength λ7 and receiving wavelength λ15 emission wavelength λ8 and receiving wavelength λ16 .

[0049] To work with the optical line terminal, it can support 16 user terminal devices, each of which can support one optical module, referred to as optical module 1, optical module 2, ..., optical module 15, optical module 16.

[0050] Optical module 1 supports receiving wavelengths λ1 and emission wavelength λ9 Optical module 9 supports receiving wavelengths λ1 and emission wavelength λ9 Optical module 2 supports receiving wavelengths λ2 and emission wavelength λ10 Optical module 10 supports receiving wavelengths λ2 and emission wavelength λ10 Optical module 3 supports receiving wavelengths. λ3 and emission wavelength λ11 Optical module 11 supports receiving wavelengths λ3 and emission wavelength λ11 Optical module 4 supports receiving wavelengths. λ4 and emission wavelength λ12 Optical module 12 supports receiving wavelengths λ4 and emission wavelength λ12 Optical module 5 supports receiving wavelengths. λ5 and emission wavelength λ13 Optical module 13 supports receiving wavelengths λ5 and emission wavelength λ13 Optical module 6 supports receiving wavelengths. λ6 and emission wavelength λ14 Optical module 14 supports receiving wavelengths λ6 and emission wavelength λ14 Optical module 7 supports receiving wavelengths. λ7 and emission wavelength λ15 Optical module 15 supports receiving wavelengths λ7 and emission wavelength λ15 Optical module 8 supports receiving wavelengths λ8 and emission wavelength λ16Optical module 16 supports receiving wavelengths λ8 and emission wavelength λ16 .

[0051] The 16 wavelengths of the optical line terminal need to be in the following order: transmission wavelength λ1 (received wavelength) λ9 ), emission wavelength λ2 (received wavelength) λ10 ), emission wavelength λ3 (received wavelength) λ11 ), emission wavelength λ4 (received wavelength) λ12 ), emission wavelength λ5 (received wavelength) l 13 ), emission wavelength λ6 (received wavelength) λ14 ), emission wavelength λ7 (received wavelength) λ15 ), emission wavelength λ8 (received wavelength) λ16 And, the emission wavelength. λ1 (received wavelength) λ9 ), emission wavelength λ2 (received wavelength) λ10 ), emission wavelength λ3 (received wavelength) λ11 ), emission wavelength λ4 (received wavelength) λ12 ), emission wavelength λ5 (received wavelength) λ13 ), emission wavelength λ6 (received wavelength) λ14 ), emission wavelength λ7 (received wavelength) λ15 ), emission wavelength λ8 (received wavelength) λ16 ).

[0052] Each port of optical power splitter 1 supports all transmit and receive wavelengths, and each port of optical power splitter 1 does not need to be configured with transmit and receive wavelengths. The optical module 1 connected to the first port needs to be configured with the receive wavelength. λ1 (Emission wavelength) λ9 The first port does not require configuration of the transmit and receive wavelengths; that is, optical module 1 must strictly adhere to the receive wavelength. λ1 (Emission wavelength) λ9 For signal transmission, optical modules of other wavelengths cannot be connected to the first port of optical power splitter 1, and user terminal equipment cannot be arbitrarily connected to the optical fiber. Optical module 2 connected to the second port of optical power splitter 1 needs to be configured with a receiving wavelength. λ2 (Emission wavelength) λ10 The second port does not require configuration of transmit and receive wavelengths.

[0053] Similarly, the optical module 8 connected to the 8th port of optical power divider 1 needs to be configured with a receiving wavelength. λ8 (Emission wavelength) λ16 The 8th port does not require configuration of transmit and receive wavelengths.

[0054] The first port of optical power splitter 2 does not require configuration of the transmit and receive wavelengths, while the connected optical module 9 requires configuration of the receive wavelength. λ1 (Emission wavelength) λ9 The optical module 10 connected to the second port of the optical power divider 2 needs to be configured with the receiving wavelength. λ2 (Emission wavelength) λ10 The optical module 11 connected to the third port of optical power divider 2 needs to be configured with the receiving wavelength. l 3 (Emission wavelength) λ11 Similarly, the optical module 16 connected to the 8th port of optical power divider 2 needs to be configured with a receiving wavelength. λ8 (Emission wavelength) λ16 ).

[0055] In the aforementioned passive optical network, the near-end optical module (i.e., the optical module at the optical line terminal) employs CWDM wavelength division multiplexing technology, incorporating a multiplexer and a demultiplexer to handle wavelength multiplexing and demultiplexing. This ensures that the near-end optical module has the same number of wavelengths as the far-end optical module (i.e., the optical module of the user terminal equipment), enabling dedicated bandwidth. Since the passive distribution network uses an optical power divider, which lacks demultiplexing functionality, a specific wavelength filter is added to the far-end optical module for demultiplexing. Because the demultiplexing function is integrated within the far-end optical module, wavelength-insensitive functionality is achieved.

[0056] For example, a near-end optical module integrates eight transmission wavelengths. A built-in multiplexer combines the eight wavelengths into a single signal, which is then transmitted to optical power splitter 1 via a single optical fiber. Optical power splitter 1 splits the single transmitted light into eight wavelengths and distributes them to the corresponding far-end optical modules (1-8). Similarly, a near-end optical module integrates eight transmission wavelengths. A built-in multiplexer combines the eight wavelengths into a single signal, which is then transmitted to optical power splitter 2 via a single optical fiber. Optical power splitter 2 splits the single transmitted light into eight wavelengths and distributes them to the corresponding far-end optical modules (9-16).

[0057] Each of the eight remote optical modules (1-8) has one transmit wavelength. The optical power splitter 1 combines the received light of the eight receive wavelengths into one path and transmits the signal to the near-end optical module through one optical fiber. The near-end optical module uses its built-in wavelength divider to decompose the one path of received light into eight wavelength signals for subsequent processing.

[0058] Each of the eight remote optical modules (9-16) has one transmit wavelength. The optical power divider 2 combines the received light of the eight receive wavelengths into one path and transmits the signal to the near-end optical module through one optical fiber. The near-end optical module uses a built-in wavelength divider to decompose the one path of received light into eight wavelength signals for subsequent processing.

[0059] In the above process, for each user terminal device, the optical power splitter and the optical module of the user terminal device transmit signals via dual fibers (dual optical fibers). For example, for each user terminal device, the optical power splitter sends signals to the optical module of the user terminal device through the first optical fiber, and the optical power splitter receives signals sent by the optical module of the user terminal device through the second optical fiber.

[0060] In the above process, due to the use of CWDM wavelength division multiplexing technology, each remote optical module and the wavelength on the optical power splitter must correspond one-to-one and cannot be arbitrarily connected. Furthermore, each remote optical module uses a dual-fiber interface, requiring two optical fibers for connection, resulting in a significant waste of fiber resources. In addition, because the optical power splitter splits multiple wavelengths, the optical power attenuation is relatively large, limiting the transmission distance.

[0061] In response to the above findings, this application proposes a pluggable 32-channel DWDM Ethernet access method. The remote optical module can use a single-fiber interface and utilizes an optical power splitter, achieving not only dedicated bandwidth but also wavelength independence. The remote optical module and the power splitter port can be connected arbitrarily. Due to the single-fiber interface design, only one optical fiber is needed for connection, saving significant fiber resources. While achieving a 1:32 splitting ratio, the use of an 8-receive, 8-transmit optical module ensures high maintainability.

[0062] This application proposes a passive optical network (PON), which may include an optical line terminal (OLT), an optical power splitter (OPD), and K user terminal devices (HTPs). The OPD is located between the OLT and the HTPs. The OPD is connected to the OLT via a single optical fiber and to the K HTPs via K optical fibers, with each HTP corresponding to one HTP. For each HTP, the OPD transmits signals to that HTP via a single optical fiber; additionally, the OPD transmits signals to the OLT via a single optical fiber.

[0063] An optical line terminal (OLT) may include M optical modules, and each optical module may include N dense wavelength division multiplexing (DWDM) bidirectional optical components. Each optical module supports K transmit wavelengths and K receive wavelengths. For example, K is determined based on the product of M and N, where K, M, and N are all positive integers greater than 1.

[0064] See Figure 3 The diagram shows the structure of a passive optical network. Taking M optical modules (including 4 optical modules) as an example, N dense wavelength division multiplexing (DWDM) bidirectional optical components (including 8 DWDM bidirectional optical components) as an example, and K transmit wavelengths (including 32 transmit wavelengths) and K receive wavelengths (including 32 receive wavelengths) as an example, that is, K user terminal devices can be 32 user terminal devices. Of course, Figure 3 This is just an example of a passive optical network, and there are no restrictions on the number of optical modules M, the number of dense wavelength division multiplexing bidirectional optical components N, or the number of received wavelengths / transmitted wavelengths K (the number of user terminal devices K).

[0065] In one example, for each optical module, the optical module may include, but is not limited to, an OSFP-XD (Octal Small Form-factor Pluggable Express Density, 16-channel small form-factor pluggable) optical module or an OSFP (Octal Small Form-factor Pluggable, 8-channel small form-factor pluggable) optical module; there is no limitation in this regard. Figure 3 In this example, we will use the OSFP optical module (OSFP module) as an example.

[0066] For each optical module, the optical module may include 8 dense wavelength division multiplexing bidirectional optical components, that is, 8-channel DWDM means 8 dense wavelength division multiplexing bidirectional optical components, and 8-channel DWDM is also called 8-channel DWDM BOSA (Bi-Directional Optical Sub-Assembly).

[0067] See Figure 3As shown, the optical line terminal also includes an arrayed waveguide grating (AWG). The WAG supports at least K transmit wavelengths and K receive wavelengths, such as 32 transmit wavelengths and 32 receive wavelengths. For each optical module, the optical module can be connected to an AWG. The optical module and the AWG support 8 transmit and 8 receive wavelengths. 8 receive wavelengths represent the 8 receive wavelengths of the optical module, which also represent the 8 receive wavelengths of the 8 input ports of the AWG. 8 transmit wavelengths represent the 8 transmit wavelengths of the optical module, which also represent the 8 transmit wavelengths of the 8 output ports of the AWG. This connection relationship is described in subsequent embodiments.

[0068] For each optical module (i.e., each of the four optical modules), the optical module supports 32 transmit wavelengths and 32 receive wavelengths. That is, it needs to support both 32 transmit and 32 receive wavelengths simultaneously, not just 8 transmit and 8 receive wavelengths. Although the optical module will only use 8 transmit and 8 receive wavelengths, it simultaneously supports 32 transmit and 32 receive wavelengths, meaning all four optical modules simultaneously support 32 transmit and 32 receive wavelengths.

[0069] For example, for each optical module, the optical module can support the emission wavelength. λ1 and receiving wavelength λ33 emission wavelength λ2 and receiving wavelength λ34 emission wavelength λ3 and receiving wavelength λ35 emission wavelength λ4 and receiving wavelength λ36 ... and so on, emission wavelength λ32 and receiving wavelength λ64 Clearly, all four optical modules need to support 32 wavelengths simultaneously (e.g., 32 transmit wavelengths and 32 receive wavelengths).

[0070] The optical power splitter connects to the optical line terminal (OLT) via a single fiber. To work with the OLT, the optical power splitter also supports 32 transmit wavelengths and 32 receive wavelengths; that is, the optical power splitter needs to simultaneously support 32 transmit wavelengths and 32 receive wavelengths. For example, the optical power splitter can support transmit wavelengths... λ1 and receiving wavelength λ33 emission wavelength λ2 and receiving wavelength λ34 emission wavelength λ3 and receiving wavelength λ35 emission wavelength λ4 and receiving wavelength λ36 ... and so on, emission wavelength λ32 and receiving wavelength λ64.

[0071] To work with optical line terminals, it can support 32 user terminal devices, each with one optical module, denoted as optical module 1, optical module 2, ..., optical module 31, optical module 32. Each optical module also supports 32 transmit wavelengths and 32 receive wavelengths.

[0072] For example, optical module 1 supports receiving wavelengths λ1 and emission wavelength λ33 Received wavelength λ2 and emission wavelength λ34 Received wavelength λ3 and emission wavelength λ35 Received wavelength λ4 and emission wavelength λ36 ... and so on, receiving wavelength λ32 and emission wavelength λ64 Similarly, optical module 2 supports receiving wavelengths. λ1 and emission wavelength λ33 Received wavelength λ2 and emission wavelength λ34 Received wavelength λ3 and emission wavelength λ35 Received wavelength λ4 and emission wavelength λ36 ... and so on, receiving wavelength λ32 and emission wavelength l 64 .

[0073] Similarly, optical module 32 supports receiving wavelengths λ1 and emission wavelength λ33 Received wavelength λ2 and emission wavelength λ34 Received wavelength λ3 and emission wavelength λ35 Received wavelength λ4 and emission wavelength λ36 ... and so on, receiving wavelength λ32 and emission wavelength λ64 Obviously, in this embodiment, for the 32 optical modules, each of these optical modules simultaneously supports 32 transmit wavelengths and 32 receive wavelengths.

[0074] An AWG (Arrayed Waveguide Grating) can include 32 output ports, each corresponding to a different emission wavelength. These wavelengths can be selected based on specific requirements; different output ports can correspond to different emission wavelengths. For example, output port 1 can correspond to different emission wavelengths. λ1 Output port 1 can correspond to the emission wavelength. λ2Output port 1 can correspond to the emission wavelength. λ3 There are no restrictions on this. Similarly, output port 2 can correspond to the transmission wavelength. λ1 Output port 2 can correspond to the emission wavelength. λ2 Output port 2 can correspond to the emission wavelength. λ3 There are no restrictions on this. In summary, as long as the 32 output ports of the AWG correspond to the 32 transmission wavelengths, there are no restrictions on the transmission wavelengths corresponding to the output ports.

[0075] An AWG (Arrayed Waveguide Grating) can include 32 input ports, each corresponding to a different receiving wavelength. The receiving wavelengths for these 32 input ports can be selected based on actual requirements; different input ports can correspond to different receiving wavelengths. For example, input port 1 (which is different from output ports 1 through 32 and can be designated as port 33) can correspond to a specific receiving wavelength. λ33 Input port 1 can receive wavelengths accordingly. λ34 There are no restrictions on this. Similarly, input port 2 (port 34) can be used to receive wavelengths. λ33 Input port 2 can receive wavelengths accordingly. λ34 There are no restrictions on this. In summary, as long as the 32 input ports of the AWG correspond to the 32 receiving wavelengths, there are no restrictions on the receiving wavelengths corresponding to the input ports.

[0076] See Figure 3 As shown, the optical power splitter is connected to the optical modules of 32 user terminal devices through 32 optical fibers, with a one-to-one correspondence between the 32 optical fibers and the 32 optical modules of the user terminal devices. For example, the optical power splitter is connected to optical module 1 through a single optical fiber 1, meaning that the optical power splitter transmits signals to optical module 1 through a single optical fiber 1; the optical power splitter is connected to optical module 2 through a single optical fiber 2, meaning that the optical power splitter transmits signals to optical module 2 through a single optical fiber 2, and so on.

[0077] In one example, an optical line terminal may include four optical modules. For each of the four optical modules, the optical module may include eight dense wavelength division multiplexing bidirectional optical components. That is, eight sets of wavelengths (such as eight transmit wavelengths and eight receive wavelengths) need to be configured for the optical module. The eight dense wavelength division multiplexing bidirectional optical components correspond one-to-one with the eight sets of wavelengths. The following describes the wavelength configuration process.

[0078] The dense wavelength division multiplexing (DWDM) bidirectional optical components in the four optical modules can be arranged in sequence, referred to as DWDM bidirectional optical component 1 (the first DWDM bidirectional optical component in the first optical module), DWDM bidirectional optical component 2 (the second DWDM bidirectional optical component in the first optical module), DWDM bidirectional optical component 3, DWDM bidirectional optical component 4, ..., DWDM bidirectional optical component 32 (the eighth DWDM bidirectional optical component in the fourth optical module).

[0079] The 32 user terminal devices (i.e., the optical modules in the 32 user terminal devices) can be arranged in sequence, and these optical modules are referred to as optical module 1, optical module 2, optical module 3, ..., optical module 32.

[0080] The arrayed waveguide grating includes 32 output ports and 32 input ports. The 32 output ports can be arranged in sequence and denoted as output port 1, output port 2, ..., output port 32. The 32 input ports can be arranged in sequence and denoted as input port 1, input port 2, ..., input port 32.

[0081] The 32 output ports correspond one-to-one with the 32 dense wavelength division multiplexing bidirectional optical components arranged in the array. For example, output port 1 corresponds to dense wavelength division multiplexing bidirectional optical component 1, output port 2 corresponds to dense wavelength division multiplexing bidirectional optical component 2, and so on. Output port 32 corresponds to dense wavelength division multiplexing bidirectional optical component 32.

[0082] The 32 input ports correspond one-to-one with the 32 dense wavelength division multiplexing bidirectional optical components arranged in the array. For example, input port 1 corresponds to dense wavelength division multiplexing bidirectional optical component 1, input port 2 corresponds to dense wavelength division multiplexing bidirectional optical component 2, and so on. Input port 32 corresponds to dense wavelength division multiplexing bidirectional optical component 32.

[0083] The 32 output ports correspond one-to-one with the 32 user terminal devices (i.e., the optical modules within the 32 user terminal devices). For example, output port 1 corresponds to optical module 1, output port 2 corresponds to optical module 2, and so on, with output port 32 corresponding to optical module 32. Similarly, the 32 input ports also correspond one-to-one with the 32 user terminal devices (the optical modules within the user terminal devices). For example, input port 1 corresponds to optical module 1, input port 2 corresponds to optical module 2, and so on, with input port 32 corresponding to optical module 32.

[0084] The arranged user terminal equipment corresponds one-to-one with the arranged dense wavelength division multiplexing bidirectional optical components. For example, optical module 1 corresponds to dense wavelength division multiplexing bidirectional optical component 1, optical module 2 corresponds to dense wavelength division multiplexing bidirectional optical component 2, and so on, with optical module 32 corresponding to dense wavelength division multiplexing bidirectional optical component 32.

[0085] Based on this, the transmit and receive wavelengths of 32 dense wavelength division multiplexing bidirectional optical components can be configured according to the transmit and receive wavelengths supported by the arrayed waveguide grating. The transmit and receive wavelengths of the optical modules of 32 user terminal devices can also be configured according to the transmit and receive wavelengths supported by the arrayed waveguide grating, so as to match the wavelengths of the 32 dense wavelength division multiplexing bidirectional optical components with the optical modules of the 32 user terminal devices.

[0086] For each dense wavelength division multiplexing (DWDM) bidirectional optical component, the transmit wavelength is configured based on the transmit wavelength supported by the corresponding output port of the DWDM bidirectional optical component; the receive wavelength is configured based on the receive wavelength supported by the corresponding input port of the DWDM bidirectional optical component. For each optical module of a user terminal device, the receive wavelength is configured based on the transmit wavelength supported by the corresponding output port of the user terminal device; the transmit wavelength is configured based on the receive wavelength supported by the corresponding input port of the user terminal device.

[0087] For example, the transmission wavelength of the dense wavelength division multiplexing bidirectional optical component 1 can be configured based on the transmission wavelength supported by output port 1, and the receiving wavelength of the optical module 1 can be configured based on the transmission wavelength supported by output port 1; the receiving wavelength of the dense wavelength division multiplexing bidirectional optical component 1 can be configured based on the receiving wavelength supported by input port 1, and the transmission wavelength of the optical module 1 can be configured based on the receiving wavelength supported by input port 1.

[0088] For example, the transmission wavelength of the dense wavelength division multiplexing bidirectional optical component 2 can be configured based on the transmission wavelength supported by the output port 2, and the receiving wavelength of the optical module 2 can be configured based on the transmission wavelength supported by the output port 2; the receiving wavelength of the dense wavelength division multiplexing bidirectional optical component 2 can be configured based on the receiving wavelength supported by the input port 2, and the transmission wavelength of the optical module 2 can be configured based on the receiving wavelength supported by the input port 2.

[0089] Similarly, the transmission wavelength of the dense wavelength division multiplexing bidirectional optical component 32 can be configured based on the transmission wavelength supported by the output port 32, and the receiving wavelength of the optical module 32 can be configured based on the transmission wavelength supported by the output port 32; the receiving wavelength of the dense wavelength division multiplexing bidirectional optical component 32 can be configured based on the receiving wavelength supported by the input port 32, and the transmission wavelength of the optical module 32 can be configured based on the receiving wavelength supported by the input port 32.

[0090] In summary, the transmit wavelength of a dense wavelength division multiplexing (DWDM) bidirectional optical component can be configured based on the transmit wavelengths supported by the output ports of the arrayed waveguide grating, and the receive wavelength can be configured for the optical module based on the transmit wavelengths supported by the output ports of the arrayed waveguide grating. The specific transmit wavelength corresponding to each output port (e.g., any output port) can be configured according to actual needs or determined by a certain algorithm; there are no restrictions on this. With 32 output ports and 32 transmit wavelengths, each output port can correspond to any one of the 32 transmit wavelengths, and different output ports can correspond to different transmit wavelengths.

[0091] The receiving wavelength for dense wavelength division multiplexing (DWDM) bidirectional optical components can be configured based on the receiving wavelengths supported by the input ports of the arrayed waveguide grating, and the transmitting wavelength for optical modules can be configured based on the receiving wavelengths supported by the input ports of the arrayed waveguide grating. The specific receiving wavelength corresponding to each input port (e.g., any input port) can be configured according to actual needs or determined by a certain algorithm; there are no restrictions on this. With 32 input ports and 32 receiving wavelengths, each input port can correspond to any one of the 32 receiving wavelengths, and different input ports can correspond to different receiving wavelengths.

[0092] For each optical module in the optical line terminal, the optical module may also include a microcontroller, such as an MCU. The microcontroller can acquire control signals (e.g., the host sends control signals to the microcontroller of the optical module). These control signals may include the transmission wavelength information (e.g., the transmission wavelengths or port identifiers of the eight output ports corresponding to the eight dense wavelength division multiplexing bidirectional optical components in the optical module) and the reception wavelength information (e.g., the reception wavelengths or port identifiers of the eight input ports). For example, when the microcontroller of optical module 1 acquires the control signal, the control signal sequentially includes the port identifier of output port 1, the port identifier of output port 2, ..., the port identifier of output port 8, the port identifier of input port 1, the port identifier of input port 2, ..., the port identifier of input port 8. The microcontroller determines the transmit wavelength corresponding to the port identifier of output port 1 and configures the transmit wavelength for the dense wavelength division multiplexing bidirectional optical component 1. It also determines the receive wavelength corresponding to input port 1 and configures the receive wavelength for the dense wavelength division multiplexing bidirectional optical component 1. The microcontroller determines the transmit wavelength corresponding to the port identifier of output port 2 and configures the transmit wavelength for the dense wavelength division multiplexing bidirectional optical component 2. It also determines the receive wavelength corresponding to input port 2 and configures the receive wavelength for the dense wavelength division multiplexing bidirectional optical component 2, and so on.

[0093] When the microcontroller of optical module 2 acquires control signals, these control signals sequentially include the port identifier of output port 9, ..., the port identifier of output port 16, the port identifier of input port 9, ..., the port identifier of input port 16. Based on this, the microcontroller determines the transmission wavelength corresponding to the port identifier of output port 9 and configures the transmission wavelength for the dense wavelength division multiplexing bidirectional optical component 9; it also determines the reception wavelength corresponding to input port 9 and configures the reception wavelength for the dense wavelength division multiplexing bidirectional optical component 9, and so on.

[0094] When the microcontroller of optical module 3 acquires control signals, these control signals sequentially include the port identifier of output port 17, ..., the port identifier of output port 24, the port identifier of input port 17, ..., the port identifier of input port 24. The microcontroller determines the transmission wavelength corresponding to the port identifier of output port 17 and configures the transmission wavelength for the dense wavelength division multiplexing bidirectional optical component 17; it determines the reception wavelength corresponding to input port 17 and configures the reception wavelength for the dense wavelength division multiplexing bidirectional optical component 17, and so on.

[0095] When the microcontroller of optical module 4 acquires control signals, these control signals sequentially include the port identifier of output port 25, ..., the port identifier of output port 32, the port identifier of input port 25, ..., the port identifier of input port 32. The microcontroller determines the transmission wavelength corresponding to the port identifier of output port 25 and configures the transmission wavelength for the dense wavelength division multiplexing bidirectional optical component 25; it determines the reception wavelength corresponding to input port 25 and configures the reception wavelength for the dense wavelength division multiplexing bidirectional optical component 25, and so on.

[0096] In one example, for each user terminal device, the user terminal device may include an optical module (such as one optical module), which may include a dense wavelength division multiplexing bidirectional optical component (such as one dense wavelength division multiplexing bidirectional optical component). That is, it is necessary to configure one set of wavelengths (such as one transmit wavelength and one receive wavelength) for the optical module. In other words, if the optical module supports 32 transmit wavelengths and 32 receive wavelengths, one set of wavelengths is configured for the optical module. The following describes the wavelength configuration process.

[0097] The 32 output ports correspond one-to-one with the 32 user terminal devices (i.e., the optical modules within the 32 user terminal devices). For example, output port 1 corresponds to optical module 1, output port 2 corresponds to optical module 2, and so on, with output port 32 corresponding to optical module 32. Similarly, the 32 input ports also correspond one-to-one with the 32 user terminal devices (the optical modules within the user terminal devices). For example, input port 1 corresponds to optical module 1, input port 2 corresponds to optical module 2, and so on, with input port 32 corresponding to optical module 32.

[0098] Based on this, and taking into account the transmit and receive wavelengths supported by the arrayed waveguide grating, transmit and receive wavelengths are configured for the optical modules of 32 user terminal devices. For each user terminal device's optical module, the receive wavelength is configured based on the transmit wavelength supported by the corresponding output port of the user terminal device; and the transmit wavelength is configured based on the receive wavelength supported by the corresponding input port of the user terminal device.

[0099] In summary, the receiving wavelength of an optical module can be configured based on the transmission wavelength supported by the output port of the arrayed waveguide grating, and the transmission wavelength can be configured based on the receiving wavelength supported by the input port of the arrayed waveguide grating. The transmission wavelength corresponding to each output port (e.g., any output port) can be configured according to actual needs or determined by a certain algorithm. Similarly, the receiving wavelength corresponding to each input port (e.g., any input port) can be configured according to actual needs or determined by a certain algorithm.

[0100] For the optical module in the user terminal equipment, the optical module may also include a microcontroller. The microcontroller can acquire control signals (e.g., the host side sends control signals to the microcontroller of the optical module). The control signals may include the transmission wavelength information of the output port corresponding to the optical module (e.g., the transmission wavelength or port identifier of the output port) and the reception wavelength information of the input port (e.g., the reception wavelength or port identifier of the input port). For example, when the microcontroller of optical module 1 acquires control signals, the control signals include the port identifier of output port 1 and the port identifier of input port 1. Based on this, the microcontroller of optical module 1 determines the transmission wavelength corresponding to the port identifier of output port 1 and configures the reception wavelength (i.e., the transmission wavelength is used as the reception wavelength) for the dense wavelength division multiplexing bidirectional optical component in optical module 1; the microcontroller determines the reception wavelength corresponding to the port identifier of input port 1 and configures the transmission wavelength (i.e., the reception wavelength is used as the transmission wavelength) for the dense wavelength division multiplexing bidirectional optical component in optical module 1.

[0101] Similarly, when the microcontroller of optical module 32 acquires control signals, the control signals include the port identifier of output port 32 and the port identifier of input port 32. The microcontroller of optical module 32 determines the transmission wavelength corresponding to the port identifier of output port 32 and configures the receiving wavelength for the dense wavelength division multiplexing bidirectional optical component in optical module 32; the microcontroller determines the receiving wavelength corresponding to the port identifier of input port 32 and configures the transmission wavelength for the dense wavelength division multiplexing bidirectional optical component in optical module 32.

[0102] In one example, an optical power splitter may include 32 ports, each corresponding to one of 32 user terminal devices (optical modules). For instance, the first port of the optical power splitter is connected to user terminal device 1 (optical module 1), the second port is connected to user terminal device 2 (optical module 2), the third port is connected to user terminal device 3 (optical module 3), and so on, with the 32nd port connected to user terminal device 32 (optical module 32).

[0103] Each port of the optical power splitter supports all transmit and receive wavelengths, and each port of the optical power splitter does not need to be configured with transmit and receive wavelengths. That is, each port of the optical power splitter does not care about transmit and receive wavelengths. Each port of the optical power splitter supports signal processing for all transmit and receive wavelengths and does not need to distinguish wavelengths when connecting to user terminal equipment (optical modules).

[0104] For example, each port of the optical power divider simultaneously supports 32 transmit wavelengths and 32 receive wavelengths. If it supports transmit wavelengths... λ1 and receiving wavelength λ33 emission wavelength λ2 and receiving wavelength λ34 emission wavelength λ3 and receiving wavelength λ35 ... and so on, emission wavelength λ32 and receiving wavelength λ64 .

[0105] Since each port of the optical power splitter supports 32 transmit wavelengths and 32 receive wavelengths simultaneously, there is no need to distinguish between wavelengths when connecting to the user terminal equipment (optical module). Therefore, when the first port of the optical power splitter is connected to user terminal equipment 1 (optical module 1), optical module 1 corresponds to the receive wavelength. λ6 and emission wavelength λ38 This allows the configuration of the receiving wavelength for the dense wavelength division multiplexing bidirectional optical component in optical module 1. λ6 and emission wavelength λ38 When the second port of the optical power splitter is connected to user terminal equipment 2 (optical module 2), the optical module 2 receives the corresponding wavelength. λ9 and emission wavelength λ41 This allows the configuration of the receiving wavelength for the dense wavelength division multiplexing bidirectional optical component in optical module 2. λ9 and emission wavelength λ41 Similarly, when the 32nd port of the optical power splitter is connected to the user terminal equipment 32 (optical module 32), the optical module 32 receives the corresponding wavelength. λ1 and emission wavelength λ33 This allows the configuration of the receiving wavelength for the dense wavelength division multiplexing bidirectional optical component in optical module 32. λ1 and emission wavelength λ33 Obviously, the optical modules connected to the ports of the optical power splitter do not need to be configured with fixed wavelengths (e.g., optical module 1 connected to the first port needs to be configured with a receiving wavelength). λ1 and emission wavelength λ33 The optical module 2 connected to the second port needs to be configured with the receiving wavelength. λ2 and emission wavelength λ34 (And so on), the wavelengths of the optical modules connected to each port of the optical power divider can be dynamically configured. Clearly, optical module 1 does not need to strictly adhere to the receiving wavelength. λ1 and emission wavelength λ33 For signal transmission, optical modules of other wavelengths can be connected to the first port of the optical power splitter, allowing user terminal equipment to be freely connected to the optical fiber. Similarly, optical modules of any wavelength can be connected to any port of the optical power splitter.

[0106] In summary, the arrayed waveguide grating of the optical line terminal corresponds to 64 wavelengths, with 32 wavelengths responsible for uplink and 32 wavelengths for downlink. After grouping 16 wavelengths (8 uplink and 8 downlink) into different optical modules, the required DWDM wavelengths for each module are determined. The four optical modules have identical structures. Control signals are sent to the MCU within the optical module via the port identifier of the arrayed waveguide grating, thereby setting different DWDM wavelengths for the BOSA module within the optical module. A single optical flange connects to an optical power splitter, which evenly distributes the optical power across the 32 optical fibers. Each optical module contains only one set of filters and a BOSA module corresponding to its wavelength, and will only receive optical power for that wavelength.

[0107] In the aforementioned passive optical network, the near-end optical module (optical module at the optical line terminal) has a built-in multiplexer and demultiplexer to handle wavelength multiplexing and demultiplexing. The number of wavelengths in the near-end optical module is equal to the number of wavelengths in the far-end optical module (optical module of the user terminal equipment), enabling dedicated bandwidth. The passive distribution network uses an optical power divider. The optical power divider itself does not have a demultiplexing function; instead, a filter for a specific wavelength is added to the far-end optical module for demultiplexing. Because the demultiplexing function is located within the far-end optical module, wavelength-insensitive functionality is achieved. For example, the near-end optical module integrates 32 transmit wavelengths. The built-in multiplexer combines the 32 transmit wavelengths into one signal, which is then transmitted to the optical power divider via a single optical fiber. The optical power divider then demultiplexes the single transmit signal into 32 transmit wavelengths and distributes them to the corresponding far-end optical modules (1-32). Each of the 32 remote optical modules (1-32) has one transmit wavelength. The optical power splitter combines the received light from the 32 receive wavelengths into one path and transmits the signal to the near-end optical module through one optical fiber. The near-end optical module uses a built-in wavelength divider to decompose the one path of received light into 32 wavelength signals for subsequent processing.

[0108] In the above process, for each user terminal device, the optical power splitter and the optical module of the user terminal device transmit signals via a single fiber (single optical fiber). For example, for each user terminal device, the optical power splitter sends signals to the optical module of the user terminal device through the optical fiber, and the optical power splitter receives signals sent by the optical module of the user terminal device through the same optical fiber.

[0109] In the above process, each remote optical module does not need to correspond one-to-one with the wavelength on the optical power splitter; they can be freely connected. For example, the receiving and transmitting wavelengths of a remote optical module connected to the first port of the optical power splitter can be arbitrarily configured and do not need to be fixed. Moreover, each remote optical module uses a single-fiber interface, requiring only one optical fiber connection per module, thus saving a significant amount of fiber resources. In addition, the optical power splitter exhibits relatively low optical power attenuation and allows for longer transmission distances.

[0110] In one example, an optical line terminal (OLT) may include M optical modules, and for each optical module, it may include N dense wavelength division multiplexing (DWDM) bidirectional optical components. The OLT may also include an arrayed waveguide grating and M optoelectronic hybrid interfaces, with each of the M optoelectronic hybrid interfaces corresponding one-to-one with one of the M optical modules.

[0111] See Figure 4AThe diagram shows the structure of an optical line terminal (OLT), taking M optical modules (including 4 optical modules) as an example, and N dense wavelength division multiplexing (DWDM) bidirectional optical components (including 8 DWDM bidirectional optical components) as an example. Based on this, an OLT can include 4 optical modules, and for each optical module, it can include 8 DWDM bidirectional optical components. The OLT can also include an arrayed waveguide grating and 4 optoelectronic hybrid interfaces, with each of the 4 optoelectronic hybrid interfaces corresponding one-to-one with one of the 4 optical modules.

[0112] Each optical module can be, but is not limited to, an OSFP-XD optical module or an OSFP optical module. Taking an OSFP optical module (OSFP module) as an example, each optical module includes eight dense wavelength division multiplexing (DWDM) bidirectional optical components. That is, an 8-channel DWDM represents eight DWDM bidirectional optical components; an 8-channel DWDM is also called an 8-channel DWDMBOSA. Each optical module is connected to an arrayed waveguide grating (AWG). The optical module and the AWG support 8 receive and 8 transmit wavelengths, where 8 receive wavelengths represent the eight receive wavelengths of the optical module, and 8 transmit wavelengths represent the eight transmit wavelengths of the optical module.

[0113] An optical line terminal (OLT) can include four optical modules (such as OSFP-XD optical modules), one color optical daughter card, one DWDM AWG (arrayed waveguide grating), and four OSFP-XD type optoelectronic hybrid interfaces, which can also be called optoelectronic blind-mating interfaces. For example, four OSFP-XD optical modules, one DWDM AWG, and four OSFP-XD type optoelectronic hybrid interfaces can be deployed on the color optical daughter card.

[0114] In one example, see Figure 4A As shown, the four optoelectronic hybrid interfaces (the black area represents the optoelectronic hybrid interface) can correspond to the arrayed waveguide grating. For each optical module, the optical module is inserted into the optoelectronic hybrid interface corresponding to that optical module so that the optical module can transmit signals with the arrayed waveguide grating.

[0115] For example, by inserting optical module 1 (i.e., the first optical module from the top) into optoelectronic hybrid interface 1 (i.e., the first optoelectronic hybrid interface from the top), optical module 1 can transmit signals with the arrayed waveguide grating (AWG); by inserting optical module 2 into optoelectronic hybrid interface 2, optical module 2 can transmit signals with the arrayed waveguide grating (AWG); by inserting optical module 3 into optoelectronic hybrid interface 3, optical module 3 can transmit signals with the arrayed waveguide grating (AWG); by inserting optical module 4 into optoelectronic hybrid interface 4, optical module 4 can transmit signals with the arrayed waveguide grating (AWG).

[0116] When an optical module in the optical line terminal (OLT) sends a first signal to an optical module in the user terminal equipment (UTA), an arrayed waveguide grating receives the first signal from the OLT and sends it to the UTA. When an optical module in the UTA sends a second signal to the OLT, the arrayed waveguide grating receives the second signal and sends it to the OLT. For example, when each optical module in the OLT (e.g., optical modules 1 to 4) sends a first signal to the UTA, the arrayed waveguide grating receives the first signal from each OLT and sends it to the UTA. When an optical module in the UTA sends a second signal to each OLT, the arrayed waveguide grating receives the second signal from each OLT and sends it to the UTA.

[0117] In one example, for each optical module of an optical line terminal, the optical module may include N dense wavelength division multiplexing bidirectional optical components, a microcontroller, a first optical interface, and a first electrical interface. See also Figure 4B The diagram shows the structure of the optical module of the optical line terminal. Taking N dense wavelength division multiplexing bidirectional optical components, including 8 dense wavelength division multiplexing bidirectional optical components, as an example, it is denoted as 8 DWDM BOSA.

[0118] For example, an OSFP-XD optical module may include one MCU (microcontroller), eight DWDM BOSAs, and one optoelectronic hybrid interface in the form of an external light source. This optoelectronic hybrid interface may include a first optical interface and a first electrical interface. The first optical interface may include a first mechanical pair transmission ferrule (such as two MT ferrules), and the first electrical interface may include a first gold-plated contact array (such as the single-sided gold fingers of the OSFP-XD).

[0119] See Figure 4B As shown, each dense wavelength division multiplexing bidirectional optical component of the optical module is connected to the first optical interface (denoted as optical port). By inserting the first optical interface into the optoelectronic hybrid interface corresponding to the optical module, the dense wavelength division multiplexing bidirectional optical components of the optical module can transmit signals with the arrayed waveguide grating.

[0120] In one example, the first gold-plated contact array can be a single-sided double-layer gold-plated contact array (e.g.) Figure 4B The yellow area in the diagram represents the first gold-plated contact array. A gold-plated contact array can also be called a gold finger. Thus, the first gold-plated contact array can be a single-sided, double-layered gold finger. A single-sided, double-layered gold-plated contact array can be a gold-plated contact array with two layers of contacts arranged on the same side of the optical module's circuit board.

[0121] For example, based on the optoelectronic hybrid interface base, the gold fingers of the single-sided single-layer OSFP can be changed to the gold fingers of the single-sided double-layer OSFP-XD. That is, a single-sided double-layer gold-plated contact array is implemented for the optical module. The gold-plated contact array is defined using the TOP SIDE side (i.e. the top surface of the circuit board) of OSFP-XD, using 8TX and 8RX electrical ports, and an optical module with a single-sided double-layer gold-plated contact array is designed and implemented.

[0122] For example, the first optical interface (optical port) can use two MT-12 interfaces (i.e., two MT ferrules), with the ferrule order defined according to the MT-12 receive and transmit specifications of the optical module. See also Figure 4C and Figure 4D The diagram shows a hybrid optoelectronic interface in ELSFP (External Laser Small Form-Factor Pluggable) form. The Host Connector, also known as a cage, has two protruding connectors representing two MT (Metal Mounting) pins. The Host Connector is a metal shield with internal elastic contacts corresponding to the optical module's gold fingers. The Host Connector is the socket (cage) on the motherboard used to insert the optical module. The internal elastic contacts are in close contact with the optical module's gold fingers, providing electrical connections for data, power, and management. Simultaneously, the cage and heatsink provide shielding and heat dissipation, serving as the physical carrier of the electrical ports.

[0123] In one example, the optical line terminal may include four optoelectronic hybrid interfaces, each corresponding to one of four optical modules. For each optoelectronic hybrid interface, the interface may include a second optical interface and a second electrical interface. The second optical interface may include a second mechanical pair transmission ferrule (such as two MT ferrules), and the second electrical interface may include a second gold-plated contact array (such as the single-sided gold fingers of an OSFP-XD).

[0124] For example, the second gold-plated contact array can be a single-sided double-layer gold-plated contact array, also known as a gold finger. A single-sided double-layer gold-plated contact array is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optoelectronic hybrid interface. For example, based on the optoelectronic hybrid interface base, the single-sided single-layer OSFP gold fingers can be changed to single-sided double-layer OSFP-XD gold fingers, that is, to implement a single-sided double-layer gold-plated contact array for the optoelectronic hybrid interface. The gold-plated contact array is defined using the TOP SIDE side (i.e., the top surface of the circuit board) of the OSFP-XD, using 8TX and 8RX electrical ports. For example, the second optical interface (optical port) can use two MT-12 interfaces (i.e., two MT ferrules), with the ferrule order defined according to the MT-12 receive / transmit definition of the optical module.

[0125] For example, regarding the pin definition of the OSFP-XD optical module, the OSFP-XD optical module has a total of 120 pins. When using a single-sided double-layer OSFP-XD gold finger, all 120 pins are on the same side of the circuit board. However, the 120 pins are on the front and back rows of the same side of the circuit board. Pins 1-60 can be on the first row of contacts on the circuit board, and pins 61-120 can be on the second row of contacts on the circuit board.

[0126] As can be seen from the above technical solutions, in this embodiment, it is not necessary to pre-configure the transmit and receive wavelengths of the dense wavelength division multiplexing bidirectional optical components of each optical module. Instead, the transmit and receive wavelengths of the dense wavelength division multiplexing bidirectional optical components of each optical module are configured according to actual needs during use. This allows user terminal equipment to be freely connected to optical fibers, greatly facilitating on-site network deployment, saving labor and time, and reducing the probability of errors. By adopting a single-fiber deployment method and utilizing an optical power splitter, not only is dedicated bandwidth achieved, but wavelength is also ignored. The optical modules of user terminal equipment can be freely connected to the ports of the optical power splitter, saving optical fiber resources, reducing optical power attenuation, increasing transmission distance, and solving problems such as occupying a large amount of optical fiber resources, large optical power attenuation, and limited transmission distance. A BiDi single-port 1:32 optical module is designed to achieve an optical transmission system that does not have a one-to-one wavelength correspondence with the optical power splitter and saves optical fiber resources. The splitting ratio is larger, which can support customers with a level comparable to PON networks, and compared with the bandwidth sharing of PON networks, each customer's bandwidth is independent.

[0127] A 1:32 Ethernet color optical access solution is implemented using a DWDM approach. A hybrid optoelectronic connector is used to enable internal light output from the near-end optical module, and AWG (Automatic Light Gauge) is placed inside the device to reduce module unit cost. Module normalization is achieved using identical BOSA modules with host-defined ports. The single-sided OSFP gold fingers of the external light source module are extended, using single-sided OSFP-XD gold fingers to implement an 8-receive, 8-transmit hybrid optoelectronic interface.

[0128] This application proposes a wavelength configuration method based on a passive optical network. The passive optical network includes an optical line terminal and K user terminal devices. The optical line terminal includes an arrayed waveguide grating and M optical modules, and the M optical modules are connected to the arrayed waveguide grating. Each optical module includes a microcontroller and N dense wavelength division multiplexing bidirectional optical components. The arrayed waveguide grating supports at least K transmit wavelengths and K receive wavelengths. K is determined based on the product of M and N, and K, M, and N are all greater than 1.

[0129] See Figure 5 The diagram shown illustrates a wavelength configuration method that can be applied to the microcontroller of each optical module. This method may include: Step 501: Obtain the transmit wavelength and receive wavelength supported by the arrayed waveguide grating.

[0130] Step 502: Configure the transmit and receive wavelengths for each dense wavelength division multiplexing bidirectional optical component in the optical module based on the transmit and receive wavelengths supported by the arrayed waveguide grating.

[0131] In one example, for each user terminal device, the user terminal device can also configure the transmission wavelength and reception wavelength of its optical module based on the transmission wavelength and reception wavelength supported by the arrayed waveguide grating, so that the dense wavelength division multiplexing bidirectional optical components in the M optical modules are wavelength matched with the optical modules of the K user terminal devices.

[0132] In one example, the arrayed waveguide grating includes K output ports and K input ports. The K output ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules, and the K input ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules. Based on the transmit and receive wavelengths supported by the arrayed waveguide grating, the transmit and receive wavelengths can be configured for each dense wavelength division multiplexing bidirectional optical component in the M optical modules, including but not limited to: For each dense wavelength division multiplexing bidirectional optical component, the emission wavelength is configured for the dense wavelength division multiplexing bidirectional optical component based on the emission wavelength supported by the corresponding output port of the dense wavelength division multiplexing bidirectional optical component; For each dense wavelength division multiplexing (DWDM) bidirectional optical component, the receiving wavelength is configured for the DWDM bidirectional optical component based on the receiving wavelength supported by the corresponding input port.

[0133] In one example, configuring the transmission and reception wavelengths for each dense wavelength division multiplexing (DWDM) bidirectional optical component in M ​​optical modules based on the transmission and reception wavelengths supported by the arrayed waveguide grating may include, but is not limited to: acquiring a control signal, the control signal including the transmission wavelength information of the output port of the arrayed waveguide grating and the reception wavelength information of the input port of the arrayed waveguide grating; determining the transmission wavelength supported by the output port of the DWDM bidirectional optical component based on the transmission wavelength information of the output port, and configuring the transmission wavelength for the DWDM bidirectional optical component; determining the reception wavelength supported by the input port of the DWDM bidirectional optical component based on the reception wavelength information of the input port, and configuring the reception wavelength for the DWDM bidirectional optical component.

[0134] In one example, for each user terminal device, the user terminal device includes an optical module, and the optical module supports at least K transmission wavelengths and K reception wavelengths; the arrayed waveguide grating includes K output ports and K input ports, the K output ports correspond one-to-one with the optical modules of the K user terminal devices, and the K input ports correspond one-to-one with the optical modules of the K user terminal devices; For each user terminal device's optical module, the transmit and receive wavelengths are configured based on the transmit and receive wavelengths supported by the arrayed waveguide grating. For example, the receive wavelength is configured based on the transmit wavelength supported by the corresponding output port of the user terminal device; and the transmit wavelength is configured based on the receive wavelength supported by the corresponding input port of the user terminal device.

[0135] In one example, the passive optical network also includes an optical power splitter located between the optical line terminal and the user terminal equipment. The optical power splitter is connected to the optical line terminal via a single optical fiber and to K user terminal equipment via K optical fibers, with each of the K optical fibers corresponding to one of the K user terminal equipment. For each user terminal equipment, the optical power splitter transmits signals to that user terminal equipment via a single optical fiber. The optical power splitter also transmits signals to the optical line terminal via a single optical fiber.

[0136] In one example, the optical line terminal (OLT) includes M optoelectronic hybrid interfaces, each corresponding to one of the M optical modules; each of the M optoelectronic hybrid interfaces corresponds to an arrayed waveguide grating (AWR). By inserting an optical module into the optoelectronic hybrid interface corresponding to that optical module, the optical module is connected to the AWR and signal transmission occurs. Specifically, when the optical module of the OLT sends a first signal to the optical module of the user terminal equipment, the AWR receives the first signal and sends it back to the optical module of the user terminal equipment; when the optical module of the user terminal equipment sends a second signal to the OLT, the AWR receives the second signal and sends it back to the OLT.

[0137] In one example, for each optical module, the optical module includes N dense wavelength division multiplexing bidirectional optical components, a microcontroller, a first optical interface, and a first electrical interface; the first optical interface includes a first mechanical pair transmission ferrule, and the first electrical interface includes a first gold-plated contact array; wherein each dense wavelength division multiplexing bidirectional optical component of the optical module is connected to the first optical interface, and by inserting the first optical interface into the optoelectronic hybrid interface corresponding to the optical module, each dense wavelength division multiplexing bidirectional optical component of the optical module can transmit signals with the arrayed waveguide grating; wherein, the first gold-plated... The gold contact array is a single-sided, double-layer gold-plated contact array, which is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optical module; wherein, the optoelectronic hybrid interface includes a second optical interface and a second electrical interface, the second optical interface includes a second mechanical pair transmission ferrule, and the second electrical interface includes a second gold-plated contact array; wherein, the second gold-plated contact array is a single-sided, double-layer gold-plated contact array, which is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optoelectronic hybrid interface.

[0138] For each optical module, the optical module includes an OSFP-XD optical module or an OSFP optical module; M optical modules include 4 optical modules; N dense wavelength division multiplexing bidirectional optical components include 8 dense wavelength division multiplexing bidirectional optical components; K transmit wavelengths and K receive wavelengths include 32 transmit wavelengths and 32 receive wavelengths.

[0139] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A passive optical network, characterized in that, The passive optical network includes an optical line terminal (OLT) and K user terminal devices. The OLT includes an arrayed waveguide grating (AWR) and M optical modules, with the M optical modules connected to the AWR. Each optical module includes a microcontroller and N dense wavelength division multiplexing (DWDM) bidirectional optical components. The AWR supports at least K transmit wavelengths and K receive wavelengths. K is determined based on the product of M and N, and K, M, and N are all greater than 1. The microcontroller is configured to configure the transmit and receive wavelengths for each dense wavelength division multiplexing bidirectional optical component in the optical module based on the transmit and receive wavelengths supported by the arrayed waveguide grating. Specifically, for each user terminal device, the user terminal device configures the transmission wavelength and reception wavelength of its optical module based on the transmission wavelength and reception wavelength supported by the arrayed waveguide grating, so that the dense wavelength division multiplexing bidirectional optical components in the M optical modules match the wavelengths of the optical modules of the K user terminal devices.

2. The passive optical network according to claim 1, characterized in that, The arrayed waveguide grating includes K output ports and K input ports. The K output ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules, and the K input ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules. The microcontroller is configured to, for each dense wavelength division multiplexing (DWDM) bidirectional optical component, configure the transmission wavelength of the DWDM bidirectional optical component based on the transmission wavelength supported by the output port corresponding to the DWDM bidirectional optical component; and configure the reception wavelength of the DWDM bidirectional optical component based on the reception wavelength supported by the input port corresponding to the DWDM bidirectional optical component.

3. The passive optical network according to claim 1 or 2, characterized in that, The microcontroller is used to acquire control signals, the control signals including the transmit wavelength information of the output port of the arrayed waveguide grating and the receive wavelength information of the input port of the arrayed waveguide grating; The microcontroller is configured to determine the transmission wavelength supported by the output port of the dense wavelength division multiplexing bidirectional optical component based on the transmission wavelength information of the output port, and configure the transmission wavelength for the dense wavelength division multiplexing bidirectional optical component; and to determine the reception wavelength supported by the input port of the dense wavelength division multiplexing bidirectional optical component based on the reception wavelength information of the input port, and configure the reception wavelength for the dense wavelength division multiplexing bidirectional optical component.

4. The passive optical network according to claim 1, characterized in that, For each user terminal device, the user terminal device includes an optical module, and the optical module supports at least K transmission wavelengths and K reception wavelengths; the arrayed waveguide grating includes K output ports and K input ports, the K output ports correspond one-to-one with the optical modules of the K user terminal devices, and the K input ports correspond one-to-one with the optical modules of the K user terminal devices; For each user terminal device's optical module, the optical module configures the receiving wavelength for that user terminal device's optical module based on the transmission wavelength supported by the corresponding output port of that user terminal device; For each user terminal device's optical module, the optical module configures the transmission wavelength for that user terminal device's optical module based on the receiving wavelength supported by the corresponding input port of that user terminal device.

5. The passive optical network according to claim 1, characterized in that, The passive optical network also includes an optical power splitter located between the optical line terminal and the user terminal equipment. The optical power splitter is connected to the optical line terminal through a single optical fiber and to the K user terminal equipment through K optical fibers, with each of the K optical fibers corresponding to one of the K user terminal equipment. For each user terminal device, the optical power splitter transmits signals to the user terminal device through a single optical fiber; the optical power splitter also transmits signals to the optical line terminal through a single optical fiber.

6. The passive optical network according to claim 1 or 2, characterized in that, The optical line terminal further includes M optoelectronic hybrid interfaces, each of which corresponds to one of the M optical modules; wherein, the M optoelectronic hybrid interfaces correspond to the arrayed waveguide grating; for each optical module, the optical module is connected to the arrayed waveguide grating and signal transmission is performed by inserting the optical module into the optoelectronic hybrid interface corresponding to the optical module. Specifically, when the optical module of the optical line terminal sends a first signal to the optical module of the user terminal equipment, the arrayed waveguide grating receives the first signal and sends the first signal to the optical module of the user terminal equipment; when the optical module of the user terminal equipment sends a second signal to the optical module of the optical line terminal, the arrayed waveguide grating receives the second signal and sends the second signal to the optical module of the optical line terminal.

7. The passive optical network according to claim 6, characterized in that, For each optical module, the optical module further includes a first optical interface and a first electrical interface; the first optical interface includes a first mechanical pair transmission ferrule, and the first electrical interface includes a first gold-plated contact array; wherein, each dense wavelength division multiplexing bidirectional optical component of the optical module is connected to the first optical interface, and by inserting the first optical interface into the optoelectronic hybrid interface corresponding to the optical module, the dense wavelength division multiplexing bidirectional optical components of the optical module can transmit signals with the arrayed waveguide grating; wherein, the first gold-plated contact array is a single-sided double-layer gold-plated contact array, which is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optical module. The optoelectronic hybrid interface includes a second optical interface and a second electrical interface. The second optical interface includes a second mechanical pair transmission insert, and the second electrical interface includes a second gold-plated contact array. The second gold-plated contact array is a single-sided double-layer gold-plated contact array, which is a gold-plated contact array with two layers of contacts arranged on the same side of the circuit board of the optoelectronic hybrid interface.

8. The passive optical network according to claim 1 or 2, characterized in that, For each optical module, the optical module includes an OSFP-XD optical module or an OSFP optical module; The M optical modules include 4 optical modules; The N dense wavelength division multiplexing bidirectional optical components include 8 dense wavelength division multiplexing bidirectional optical components; The K transmit wavelengths and K receive wavelengths include 32 transmit wavelengths and 32 receive wavelengths.

9. A wavelength configuration method based on a passive optical network, characterized in that, The passive optical network includes an optical line terminal (OLT) and K user terminal devices. The OLT includes an arrayed waveguide grating (AWR) and M optical modules, with the M optical modules connected to the AWR. Each optical module includes a microcontroller and N dense wavelength division multiplexing (DWDM) bidirectional optical components. The AWR supports at least K transmit wavelengths and K receive wavelengths. K is determined based on the product of M and N, where K, M, and N are all greater than 1. The method is applied to the microcontroller of the optical module, and the method includes: Based on the transmit and receive wavelengths supported by the arrayed waveguide grating, each dense wavelength division multiplexing bidirectional optical component in the optical module is configured with a transmit and receive wavelength.

10. The method according to claim 9, characterized in that, The arrayed waveguide grating includes K output ports and K input ports. The K output ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules, and the K input ports correspond one-to-one with the K dense wavelength division multiplexing bidirectional optical components in the M optical modules. The configuration of the transmission and reception wavelengths for each of the M dense wavelength division multiplexing bidirectional optical components in the arrayed waveguide gratings, based on the supported transmission and reception wavelengths, includes: For each dense wavelength division multiplexing bidirectional optical component, the emission wavelength is configured for the dense wavelength division multiplexing bidirectional optical component based on the emission wavelength supported by the corresponding output port of the dense wavelength division multiplexing bidirectional optical component; For each dense wavelength division multiplexing (DWDM) bidirectional optical component, the receiving wavelength is configured for the DWDM bidirectional optical component based on the receiving wavelength supported by the corresponding input port.

11. The method according to claim 9 or 10, characterized in that, The configuration of the transmission and reception wavelengths for each of the M dense wavelength division multiplexing bidirectional optical components in the arrayed waveguide gratings, based on the supported transmission and reception wavelengths, includes: Acquire control signals, the control signals including the transmit wavelength information of the output port of the arrayed waveguide grating and the receive wavelength information of the input port of the arrayed waveguide grating; Based on the emission wavelength information of the output port, determine the emission wavelength supported by the output port of the dense wavelength division multiplexing bidirectional optical component, and configure the emission wavelength for the dense wavelength division multiplexing bidirectional optical component. Based on the received wavelength information of the input port, determine the received wavelength supported by the input port of the dense wavelength division multiplexing bidirectional optical component, and configure the received wavelength for the dense wavelength division multiplexing bidirectional optical component.

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