Single-fiber wavelength division optical transmission equipment and system thereof

Abstract

The invention discloses single-fiber wavelength division optical transmission equipment and a system thereof. The equipment comprises a case, a service processing module, a wave combining and dividing module, a network management module, a power supply module and a heat dissipation module, the service processing module comprises at least one optical wavelength conversion unit, and the optical wavelength conversion unit is used for converting an accessed non-standard wavelength signal into a plurality of paths of standard wavelength signals; the wave combining and separating module comprises a wave combining unit and a wave separating unit, the wave combining unit is used for combining multiple paths of standard wavelength signals into one path of composite optical signal, and the wave separating unit is used for separating the composite optical signal into multiple paths of single wavelength signals; the network management module is used for monitoring the working state of each module in real time; the power supply module supports alternating current or direct current input and outputs stable voltage; the heat dissipation module is provided with a speed-adjustable heat dissipation fan. According to the scheme, optical fiber resources can be efficiently integrated, multiple services can be flexibly adapted, and the deployment and upgrading cost is low.

Description

Technical Field

[0001] This invention relates to the field of optical transmission technology, and in particular to a single-fiber wavelength division multiplexing (WDM) transmission device and system thereof. Background Technology

[0002] In the long-term operation of power communication networks and other industry communication networks, issues related to optical fiber resources have become increasingly prominent, becoming a key bottleneck restricting network upgrades and business expansion. Upgrading network communication systems faces some unavoidable difficulties, such as aging network equipment and a shortage of optical fiber resources.

[0003] Early-built communication network equipment is technologically outdated and aging, making it difficult to meet the current high-bandwidth, multi-service transmission demands. Meanwhile, core and access layer fiber optic resources have long been saturated, requiring new fiber optic cables for new services. However, laying new cables and upgrading existing hardware is costly, time-consuming, and faces technical compatibility issues with existing line upgrades. Furthermore, equipment upgrades and new fiber optic cable installations typically occur in older areas, particularly in older residential communities and remote substations. Upgrading network infrastructure requires complex power outage approval procedures, and construction can disrupt residential power supply or the power grid, leading to high coordination costs, potential user complaints, and operational risks, thus slowing down the upgrade process.

[0004] While existing wavelength division multiplexing (WDM) equipment can achieve multi-wavelength transmission, it generally suffers from the following shortcomings: First, it lacks flexibility in service access, requiring adjustments to existing network operation methods or network management systems, resulting in long deployment cycles; second, it has low modularity, requiring complete board replacement for functional expansion, leading to high upgrade costs; and third, it lacks adaptation and optimization for specific industry services such as power, making it difficult to meet the industry's personalized needs. Therefore, there is an urgent need for a single-fiber wavelength division multiplexing (WDM) transmission solution that can efficiently integrate fiber optic resources, flexibly adapt to multiple services, and achieve low-cost deployment and upgrades. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems presented above and provide a single-fiber wavelength division multiplexing transmission device and system to solve the problems of low fiber resource utilization, complex service deployment and high operating costs, realize efficient single-fiber transmission of multiple dual-core services, and have the characteristics of flexible expansion and convenient deployment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect of the present invention, a single-fiber wavelength division multiplexing (WDM) transmission device is provided. The device includes a chassis, a service processing module, a multiplexing / demultiplexing module, a network management module, a power supply module, and a heat dissipation module. Each module is integrated within the chassis and interacts with signals and data via a backplane bus. The service processing module includes at least one optical wavelength conversion unit that converts incoming non-standard wavelength signals into multiple standard wavelength signals conforming to a preset standard. The multiplexing / demultiplexing module includes a multiplexing unit and a demultiplexing unit. The multiplexing unit combines the multiple standard wavelength signals into a single composite optical signal and couples it to a single optical fiber. The demultiplexing unit separates the received composite optical signal into multiple single-wavelength signals. The network management module employs a network control unit, providing local and remote management interfaces for real-time monitoring of the operating status of each module. The power supply module supports AC or DC input and employs a hot-swappable design to output a stable voltage. The heat dissipation module uses a hot-swappable fan unit equipped with an adjustable-speed cooling fan whose speed automatically adjusts according to the temperature inside the chassis.

[0007] In one embodiment, the service processing module includes an OTDX board and an OTSX board, wherein the OTDX board supports 4-way bidirectional service transmission and the OTSX board supports 8-way unidirectional service transmission.

[0008] In one embodiment, the service processing module supports SDH, Ethernet, SAN storage, CPRI, video, and xPON signal access.

[0009] In one embodiment, the multiplexing / demultiplexing module supports 2-16 wavelength multiplexing / demultiplexing, wherein the wavelength spacing is 0.4nm / 0.8nm in DWDM mode and 20nm in CWDM mode, and a reserved expansion port supports the connection of an expansion multiplexing / demultiplexing board to achieve more wavelength expansion.

[0010] In one embodiment, the multiplexing / splitting module includes a single-fiber bidirectional multiplexing / splitting integrated board and a dual-fiber bidirectional multiplexing / splitting board. The single-fiber bidirectional mode adopts a transmit / receive wavelength matching design, while the dual-fiber bidirectional mode adopts a transmit / receive wavelength consistent design.

[0011] In one embodiment, the network management module works independently of the service module, supporting port loopback testing, rate configuration, and online software upgrades.

[0012] In one embodiment, the power module outputs a current ranging from 10A to 25A and consumes power ranging from 60W to 300W.

[0013] In a second aspect of the invention, a single-fiber wavelength division multiplexing (WDM) transmission system is provided, comprising at least two of the aforementioned single-fiber WDM transmission devices. The two devices are connected by a single optical fiber to form a point-to-point transmission link, supporting chain or ring network expansion. The service processing module of the transmitting device receives multiple dual-core service signals and converts them into standard wavelength signals. These signals are then combined into a composite optical signal by a multiplexing module and transmitted to the receiving device via a single fiber. The wavelength division module of the receiving device separates the composite optical signal into multiple single-wavelength signals, which are then restored to the original service signal by the service processing module.

[0014] In one embodiment, the system can achieve lossless transmission of SDH signals by adding an SDH pass-through module and achieve physical isolation of GPON / EPON signals by adding an xPON hard isolation module.

[0015] In one embodiment, the multi-channel dual-core service signal includes at least two of the following: information network signals, video surveillance signals, dispatch telephone signals, and intelligent inspection data signals.

[0016] The device and system designed in this invention significantly improve the utilization rate of optical fiber resources through DWDM / CWDM technology. At the same time, the modular design supports rapid service access and expansion. The device does not require adjustment of the existing network operation mode and network management system, making it particularly suitable for renovation scenarios such as old residential areas and substations. The system stability is enhanced, it is compatible with existing power communication network equipment, and the upgrade and replacement costs are reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This diagram illustrates the modular organization structure of a single-fiber wavelength splitting transmission device. Figure 2 A flowchart illustrating the interaction between the transmitter and receiver in a single-fiber wavelength splitting transmission system is shown. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Dense Wavelength Division Multiplexing (DWDM) and Coarse Wavelength Division Multiplexing (CWDM) are both methods of Wavelength Division Multiplexing (WDM), distinguished by differences in operating wavelength bands and wavelength spacing. DWDM uses cooled lasers, while CWDM uses uncooled lasers. DWDM typically multiplexes multiple closely spaced optical wavelengths (around 0.2-0.8 nm spacing) within a single optical fiber, while CWDM has a larger wavelength spacing, around 20 nm. Wavelength division multiplexing combines optical signals of different wavelengths using a multiplexer and couples them into a single optical fiber for transmission. The main structure of a WDM system is the Optical Transform Unit (OTU), which converts non-standard wavelength signals to standard wavelength signals. Specifically, the standard wavelength signals typically conform to ITU-T G.694.1 / G.694.2.

[0021] The main implementation scenario of the present invention is on the public Internet, breaking the previous limitation of wavelength division signal processing in private networks, and saving optical fiber resources on the public Internet.

[0022] The solution of this invention is particularly suitable for scenarios such as power communication networks that are sensitive to the utilization rate of optical fiber resources, the flexibility of service carrying and the operation and maintenance costs. It can realize the single-fiber integrated transmission of multiple dual-core services through dense wavelength division multiplexing or coarse wavelength division multiplexing technology.

[0023] In one implementation, see Figure 1 , Figure 1 A modular organizational structure diagram of a single-fiber wavelength splitter transmission device is shown. The single-fiber wavelength splitter transmission device includes a chassis 11, a service processing module 12, a multiplexing / splitting module 13, a network management module 14, a power supply module 15, and a heat dissipation module 16.

[0024] In this embodiment, the chassis 11 conforms to the IEC60297 or ETSI300-119 standards, and adopts a modular structure of 1U / 2U / 5U depending on different actual scenarios. The chassis 11 offers diverse installation options, supporting 19-inch rack, ETSI rack, wall mounting, desktop, or wireless outdoor cabinet installation. Furthermore, the chassis 11 features 4-12 service board slots and supports up to 2 power supply slots, meeting the module expansion needs of different scenarios.

[0025] In this embodiment, the service processing module 12 includes at least one optical wavelength conversion unit (OTU). The OTU supports access to any protocol service signal within the rate range of 125 Mbit / s to 11.3 Gbit / s and has 3R regeneration function, which can convert the accessed non-standard wavelength signal into a wavelength signal that conforms to the ITU-T G.694.1 (DWDM) or ITU-T G.694.2 (CWDM) standard.

[0026] The 3R regeneration function specifically refers to the three-stage technology of re-amplification, retiming, and reshaping, used to repair fiber optic signals after long-distance transmission and restore the original characteristics of the signal. The three stages are respectively used to compensate for signal attenuation, repair signal distortion, and eliminate signal offset.

[0027] Specifically, during transmission, fiber optic signals experience signal attenuation due to overcoming transmission resistance, resulting in lower signal strength. A built-in optical amplifier amplifies the weak input signal to ensure sufficient strength before it enters subsequent processing stages or the transmission link. Preferably, the optical amplifier can be a semiconductor optical amplifier (SOA) or an erbium-doped fiber amplifier (EDFA). Furthermore, fiber optic signals are inherently periodic waves, and during transmission, transmission delays and jitter in the transmission medium can cause the signal to deviate from its original period, resulting in time offset. The re-timing technique first extracts a synchronization clock from the input signal, then uses the recovered clock as a reference to calibrate the position of the signal pulses, ensuring that the start and end times of each pulse strictly match the timing specifications of the original signal. Finally, fiber optic signal reshaping refers to repairing the distorted signal waveform, making the pulse edges steeper, normalizing the pulse width, and restoring the digital characteristics of the signal. The specific reshaping method is based on the following processing approach: correcting the blurred pulse edges of the digital optical signal to steep rising and falling edges, ensuring that the amplitude and width of "1" pulses are consistent, and that the noise level of "0" pulses is below the decision threshold to avoid misjudgment at the receiver.

[0028] In this embodiment, the service processing module 12 includes at least one optical wavelength conversion unit, capable of converting incoming non-standard wavelength signals into multiple standard wavelength signals that conform to preset standards. The service processing module 12 also supports SDH (STM-1 / 4 / 16 / 64), Ethernet (FE / GE / 10GE / 40GE / 100GE), SAN storage (FC100 / 200 / 400 / 800 / 1200, FICON), CPRI (options 1-7), video (DVB-ASI / SDI / HD-SDI / 3G-SDI), and xPON (GPON / EPON) signal access, adapting to multiple service scenarios in power communication networks.

[0029] Furthermore, the service processing module 12 includes an OTDX board and an OTSX board. OTDX and OTSX are two different specifications of the service processing modules instantiated in the solution provided by this invention. The OTDX board supports 4-channel bidirectional service transmission, while the OTSX board supports 8-channel unidirectional service transmission. Both boards adopt an SFP / SFP+ pluggable optical module design. The customer-side optical port supports single-mode / multi-mode adaptation, and the wavelength division multiplexing (WDM) side optical port supports DWDM / CWDM wavelength switching, which can be flexibly configured according to the service type. The parameter configurations of the OTDX and OTSX boards are shown in Table 1 below: Table 1:

[0030] In this embodiment, the multiplexing / demultiplexing module 13 includes a multiplexing unit and a demultiplexing unit. The multiplexing unit combines multiple standard wavelength signals output by the service processing module into a single composite optical signal, which is then coupled to a single optical fiber for transmission. The demultiplexing unit receives the composite optical signal transmitted from a remote device, separates it into multiple single-wavelength signals, and sends them to the service processing module. The multiplexing / demultiplexing module 13 supports 2-16 wavelength multiplexing / demultiplexing. In DWDM mode, the wavelength spacing is 0.4nm / 0.8nm (C-band 1527.61nm-1565.50nm), and in CWDM mode, the wavelength spacing is 20nm (1271nm-1611nm, excluding long-distance transmission interference wavelengths of 1371nm / 1391nm). It also has reserved expansion ports to support the cascaded expansion multiplexing / demultiplexing boards to achieve more wavelength expansion.

[0031] Specifically, as an example, the multiplexing / demultiplexing module 13 includes a single-fiber bidirectional multiplexing / demultiplexing integrated board (such as (P)B08DA / B, (P)B08CA / B) and a dual-fiber bidirectional multiplexing / demultiplexing board (such as (P)X08DA / B, (P)X08CA / B). In single-fiber bidirectional mode, a paired transmit and receive wavelength design is adopted; in dual-fiber bidirectional mode, a consistent transmit and receive wavelength design is adopted, which can meet the transmission requirements of different fiber optic resource scenarios. The multiplexing / demultiplexing module has an insertion loss of <5.5dB, adjacent channel isolation >25dB, and non-adjacent channel isolation >30dB, ensuring signal transmission quality.

[0032] In this embodiment, the network management module 14 adopts a network control unit (NCP), providing a Micro-USB local management interface and two RJ45 Gigabit Ethernet remote management interfaces. It supports four network management methods: CLI, Telnet, SNMP, and Web. It can monitor the working status of each module in real time, enabling port loopback testing, speed configuration, and online software upgrades. The network management module 14 operates independently of other service modules; hot-swapping or failures do not affect existing service transmissions. The network management module 14 also supports port loopback testing, speed configuration, and online software upgrades.

[0033] In this embodiment, the power module 15 supports both AC and DC power as input and outputs a stable 12VDC voltage. It adopts a 1+1 hot backup design, with an output current between 10A and 25A and a design power consumption between 60W and 300W, which can meet various power requirements.

[0034] In this embodiment, the heat dissipation module 16 adopts a hot-swappable fan unit, configured with 2-6 adjustable speed cooling fans. The dust filter-free design reduces maintenance operations. The fan speed is automatically adjusted according to the temperature inside the chassis to ensure that the equipment operates stably within the operating temperature range of -10℃ to 60℃.

[0035] In another implementation, see Figure 2 , Figure 2 The diagram illustrates the interaction flow between the transmitter and receiver in a single-fiber wavelength splitting transmission system provided by this invention. The system includes at least two of the aforementioned single-fiber wavelength splitting transmission devices, and at least two devices are connected via a single optical fiber to form a point-to-point transmission link. The system also supports chain and ring network expansion, enabling multi-node service interconnection by increasing the number of transmission devices.

[0036] As an implementation example of a single-fiber wavelength division multiplexing (WDM) transmission system, the service transmission process in this system is described below: S201, the service processing module of the transmitting device receives multiple dual-core service signals and converts the service signals into standard wavelength signals before sending them to the multiplexing module; S202, the multiplexing module outputs a composite optical signal and transmits it to the receiving device through a single fiber; S203, the wavelength division module of the receiving device separates the composite optical signal into multiple single-wavelength signals, sends them to the service processing module to restore them to the original service signal, and completes the single-fiber transmission.

[0037] In this embodiment, the single-fiber wavelength division multiplexing (WDM) transmission system also features a service protection mechanism. Specifically, in a ring network configuration, it supports optical line protection; when a fiber segment is interrupted, the system automatically switches to a backup link to ensure uninterrupted service. Furthermore, the system's optical interface conforms to the ITU-T G.664 standard and supports automatic laser shutdown, enhancing the system's operational safety.

[0038] In this embodiment, the multi-channel dual-core service signal includes at least two of the following: information network signals (internal and external), video surveillance signals, dispatch telephone signals, and intelligent inspection data signals.

[0039] In addition, the system has expansion capabilities: lossless SDH signal transmission can be achieved by adding an SDH transparent transmission module, or physical isolation of GPON / EPON signals can be achieved by adding an xPON hard isolation module. Thus, the added modules are installed according to specific circumstances, meeting the power communication network's requirements for service security and compatibility.

[0040] The single-fiber wavelength splitting transmission device and system provided by the present invention will be described in detail below with specific examples.

[0041] Exemplary Device: In this example, a single-fiber wavelength division multiplexing (WDM) transmission device with a 1U chassis is provided. The device is configured with a chassis measuring 44mm high, 442mm wide, and 220mm deep, with a full-load weight of 7.5kg. The chassis has slots for 4 service boards, 2 power supplies, and 1 fan, and supports 19-inch rack mounting.

[0042] For the service processing module, one OTDX board is configured to support four bidirectional service access channels. The customer-side optical port uses an SFP+ multimode module to adapt to GE / 10GE signals, while the wavelength division side optical port uses an SFP+ DWDM module with a wavelength spacing of 0.8nm to achieve 3R regeneration and wavelength conversion.

[0043] For the multiplexing / splitting module, one (P)X08DA dual-fiber bidirectional multiplexing / splitting board is configured, which supports 8 channels of DWDM wavelength multiplexing / splitting; the multiplexing / splitting module also connects to the wavelength signal output from the OTDX board, and the multiplexed signal is output through a single fiber.

[0044] For the network management module, one NCP board is configured, providing a web management interface to monitor the OTDX board's transmit optical power, receive sensitivity, and temperature in real time. Testing shows that under normal conditions, the OTDX board's transmit optical power is ≥-1dBm, and its receive sensitivity is ≤-16dBm.

[0045] The power supply module is configured with two DPU-I DC power supply boards, using a 1+1 hot backup configuration. Typically, the input current is -48VDC, the output voltage is 12VDC, the output current is 10A, and the total power consumption is 60W. The cooling module is configured with one FAN-I fan board containing three adjustable-speed fans that automatically adjust their speed based on the chassis temperature. The default temperature thresholds have already been mentioned above and will not be repeated here.

[0046] The following example, using a substation renovation scenario, illustrates the single-fiber wavelength splitting transmission system of this invention.

[0047] Exemplary System: This embodiment constructs a single-fiber wavelength division multiplexing (WDM) transmission system between a substation and a dispatch center based on the above-described equipment. The system comprises two transmission devices as described above, deployed at the substation and dispatch center respectively, connected by a single G.652 single-mode optical fiber, with a transmission distance controlled within 40km.

[0048] When a service is connected, the substation-side equipment connects to four services, including two 1080P / 25fps video surveillance channels with a bitrate of 4Mbps, one dispatch telephone channel, and one intelligent inspection data channel. These are converted into C21-C24 wavelength signals by the OTDX board, combined, and then transmitted through a single fiber.

[0049] During reception processing, the equipment at the dispatch center receives the composite optical signal, which is then separated into C21-C24 wavelength signals by the multiplexing and demultiplexing module. The OTDX board restores the original service signal and connects it to the dispatch center's monitoring platform, telephone exchange, and data server.

[0050] In addition, the system includes a protection mechanism, which adopts a ring network and adds a backup fiber optic link. When the main link is interrupted, the NCP module triggers protection switching within 50ms, which can ensure that ongoing services are not interrupted.

[0051] Finally, the system also includes expansion capabilities. Adding two more EPON signals later in the system's lifespan requires only adding one xPON-enabled OTU board and one multiplexing / demultiplexing board with an extended wavelength between C25 and C26 to each of the two devices. This expansion does not require replacing existing modules, reducing costs by approximately 50% compared to conventional expansion methods.

[0052] The present invention provides a single-fiber wavelength division multiplexing (WDM) transmission device, including a chassis, a service processing module, a multiplexing / demultiplexing module, a network management module, a power supply module, and a heat dissipation module. Each module is integrated within the chassis and interacts with signals and data via a backplane bus. The service processing module includes at least one optical wavelength conversion unit. The multiplexing / demultiplexing module includes a multiplexing unit and a demultiplexing unit. The network management module uses a network control unit, providing both local and remote management interfaces. The power supply module supports AC or DC input and employs a hot-swappable design to output a stable voltage. The heat dissipation module uses a hot-swappable fan unit and is equipped with an adjustable-speed cooling fan.

[0053] The present invention also provides a single-fiber wavelength splitting transmission system, including at least two of the above-mentioned single-fiber wavelength splitting transmission devices. The two devices are connected by a single optical fiber to form a point-to-point transmission link, supporting chain or ring network expansion. The service processing module of the transmitting device receives multiple dual-core service signals and converts the multiple dual-core service signals into standard wavelength signals. The signals are then combined into a composite optical signal by a multiplexing module and transmitted to the receiving device through a single fiber. The wavelength splitting module of the receiving device separates the composite optical signal into multiple single-wavelength signals, which are then restored to the original service signal by the service processing module.

[0054] The technical solution of this invention integrates multiple services such as information intranet / extranet, video surveillance, dispatch telephone, administrative telephone, video conferencing, and intelligent inspection into a single fiber for transmission, which greatly improves the utilization rate of optical fiber resources. By integrating 2-16 dual-core services into single-fiber transmission through DWDM / CWDM technology, it effectively alleviates the problem of optical fiber resource shortage, reduces the need for new optical fiber laying, and lowers the cost of optical fiber procurement and leasing. Calculations show that it can increase the utilization rate of optical fiber resources by more than 76%.

[0055] In addition, implementing the solution of this invention allows for flexible and convenient service deployment. The equipment does not require adjustments to the existing network operation mode and network management system. The modular design supports rapid service access and expansion, and the deployment cycle is shortened by more than 50%. It is especially suitable for renovation scenarios such as old residential areas and substations, reducing coordination and construction costs.

[0056] Furthermore, implementing the present invention enhances system stability and compatibility, achieving an availability of 0.99999, annual downtime ≤ 5 minutes, and mean time between failures > 100,000 hours. The system also features a dust-free heat dissipation design, hot-swappable modules to reduce maintenance, and a mean time to repair ≤ 2 hours, significantly reducing operational costs. Modular expansion eliminates the need for complete equipment replacement, reducing upgrade costs by over 40%, resulting in a clear long-term operational cost advantage.

[0057] The specific embodiments of the invention have been described in detail above, but they are only examples, and this application is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the invention are also within the scope of this application. Therefore, all equivalent changes, modifications, and improvements made without departing from the spirit and principles of this application should be covered within the scope of this application.

Claims

1. A single-fiber wavelength splitting transmission device, comprising a chassis, a service processing module, a multiplexing / splitting module, a network management module, a power supply module, and a heat dissipation module, wherein each module is integrated within the chassis and achieves signal and data interaction through a backplane bus, characterized in that: The service processing module includes at least one optical wavelength conversion unit, which converts the incoming non-standard wavelength signal into multiple standard wavelength signals that conform to a preset standard. The multiplexing and demultiplexing module includes a multiplexing unit and a demultiplexing unit. The multiplexing unit is used to combine the multiple standard wavelength signals into a single composite optical signal and couple it to a single optical fiber. The demultiplexing unit is used to separate the received composite optical signal into multiple single wavelength signals. The network management module adopts a network control unit, which provides local management interface and remote management interface for real-time monitoring of the working status of each module; The power module supports AC or DC input and adopts a hot backup design to output a stable voltage. The heat dissipation module uses a hot-swappable fan unit and is equipped with an adjustable-speed cooling fan whose speed is automatically adjusted according to the temperature inside the chassis.

2. The device according to claim 1, characterized in that, The service processing module includes an OTDX board and an OTSX board, wherein the OTDX board supports 4-way bidirectional service transmission and the OTSX board supports 8-way unidirectional service transmission.

3. The device according to claim 1, characterized in that, The service processing module supports SDH, Ethernet, SAN storage, CPRI, video, and xPON signal access.

4. The device according to claim 1, characterized in that, The multiplexing / splitting module supports 2-16 wavelengths for multiplexing / splitting. In DWDM mode, the wavelength spacing is 0.4nm / 0.8nm, and in CWDM mode, the wavelength spacing is 20nm. It also has a reserved expansion port to support the connection of an expansion multiplexing / splitting board to achieve more wavelength expansion.

5. The device according to claim 1, characterized in that, The multiplexing / splitting module includes a single-fiber bidirectional multiplexing / splitting integrated board and a dual-fiber bidirectional multiplexing / splitting board. The single-fiber bidirectional mode adopts a transmit / receive wavelength matching design, while the dual-fiber bidirectional mode adopts a transmit / receive wavelength consistent design.

6. The device according to claim 1, characterized in that, The network management module works independently of the service module, and supports port loopback testing, rate configuration, and online software upgrades.

7. The device according to claim 1, characterized in that, The power module outputs a current ranging from 10A to 25A and consumes power ranging from 60W to 300W.

8. A single-fiber wavelength splitting transmission system, characterized in that, It includes at least two single-fiber wavelength splitting transmission devices as described in any one of claims 1-7 above, wherein the two devices are connected by a single optical fiber to form a point-to-point transmission link, supporting chain or ring network expansion; The service processing module of the transmitting device receives multiple dual-core service signals and converts them into standard wavelength signals. These signals are then combined into a composite optical signal by a multiplexing module and transmitted to the receiving device via a single fiber. The wavelength division module of the receiving device separates the composite optical signal into multiple single-wavelength signals, which are then restored to the original service signal by the service processing module.

9. The system according to claim 8, characterized in that, The system can achieve lossless transmission of SDH signals by adding an SDH pass-through module, and achieve physical isolation of GPON / EPON signals by adding an xPON hard isolation module.

10. The system according to claim 8, characterized in that, The multi-channel dual-core service signal includes at least two of the following: information internal and external network signals, video surveillance signals, dispatch telephone signals, and intelligent inspection data signals.

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