A split-link system with port status identification and shutdown functions

Abstract

This invention discloses a beam splitting link system with port status identification and shutdown functions, relating to the field of beam splitting link technology. It includes: a primary beam splitting module for splitting auxiliary optical signals from a main link; a secondary beam splitting module connected to the primary beam splitting module for splitting the auxiliary optical signals into n replicated links, each replicated link including an SOA device, a reflected light and output light sampling unit, and an output port; a reflected light power detection module connected to the reflected light and output light sampling unit in each replicated link for detecting the reflected light power at the output port of each replicated link; and a control module that determines the port status of each output port based on the reflected light power detected by the reflected light power detection module; configures the power supply polarity of the corresponding SOA device according to the status of each output port, and controls the SOA device to perform gain amplification or link shutdown functions. This system has port status identification and shutdown functions and can reduce system complexity.

Description

Technical Field

[0001] This invention relates to the field of optical splitting link technology, and in particular to an optical splitting link system with port status identification and shutdown functions. Background Technology

[0002] Fiber optic amplification products and intelligent fiber optic amplification products are currently widely used in data link acquisition projects of major operators. These products are also used in specific projects such as public security monitoring. Their main optical path structure is as follows: First-stage splitting is used to divide the power from the main link. If the power is too low, an optical amplifier is used to amplify the power, and then a second-stage splitting is used to achieve multi-link replication. The first-stage splitting mainly uses 80 / 20 or 90 / 10 splitters. The optical amplifier can use an SOA for direct amplification or use OEO service regeneration output. The second-stage splitting generally uses an evenly distributed 4-port splitter or an 8-port splitter for link replication. For intelligent fiber optic amplification products, a VOA or optical switch is added to the second-stage replicated link to control the link's on / off state.

[0003] However, currently known spectroscopic amplification products have the following technical drawbacks: 1. Low device integration and complex control: In existing systems, amplification devices and shutdown devices are implemented using different devices. The amplifier has high power requirements and is difficult to implement. Both the amplification optical path and the shutdown optical path need to be monitored by power monitoring devices, which leads to complex system control and high cost.

[0004] 2. Port status cannot be automatically identified and reported: When the port of the replication link is not connected to the downstream device (such as a floating or idle port), the system cannot automatically identify and report the status, and cannot promptly determine potential risks such as unauthorized port access and leakage of security information.

[0005] 3. Delayed Shutdown Control: Although intelligent optical splitter amplification products can control the shutdown of the replication link through VOA or optical switches, there are problems such as the inability to automatically identify idle ports and delayed shutdown. For example, in the existing technologies with publication numbers CN114422886A and CN217932493U, although optical switches or VOAs are introduced into the original optical splitter link to remotely realize the shutdown of the replication link, they cannot shut down the replication link port in a timely manner based on its status. Summary of the Invention

[0006] To address the aforementioned problems and technical requirements, the inventors have proposed a split-link system with port status identification and shutdown functions. The technical solution of this invention is as follows: A splitter link system with port status identification and shutdown functions includes: The primary optical splitter module is used to split the optical signal from the main link to obtain the auxiliary optical signal; A secondary beam splitter module, connected to the primary beam splitter module, is used to split the auxiliary optical signal into n replica links for output. Each replica link includes an SOA device, a reflected light and output light sampling unit, and an output port. The reflected light power detection module is connected to the reflected light and output light sampling unit in each replication link and is used to detect the reflected light power at the output port of each replication link. The control module is used to determine the port status of each output port based on the reflected light power detected by the reflected light power detection module. Configure the power supply polarity of the corresponding SOA device according to the port status of each output port, so as to control the SOA device to realize the gain amplification function or the link shutdown function.

[0007] A further technical solution is that each replication link also includes an output optical power detection unit connected to the reflected light and output light sampling unit, used to detect the output optical power of the output port of each replication link; The control module calculates the return loss of each output port based on the output optical power and reflected optical power of each output port, and determines the port status based on the return loss of each output port.

[0008] A further technical solution is that when the return loss is less than or equal to the first threshold, the control module determines that the output port is in a floating state. When the return loss is between the first threshold and the second threshold, the control module determines that the output port is in a connection abnormal state. When the return loss is greater than or equal to the second threshold, the control module determines that the output port is in a normal state.

[0009] A further technical solution is that the reflected light power detection module includes n reflected light power detection units corresponding one-to-one with the n replica links, and each reflected light power detection unit is connected to the reflected light and output light sampling unit in the corresponding replica link to detect the reflected light power of each output port.

[0010] A further technical solution is that the reflected light power detection module includes a reflected light power detection unit and an n×1 optical switch. The reflected light power detection unit is connected to the output terminal of the n×1 optical switch, and the n input terminals of the n×1 optical switch are connected one-to-one with the reflected light and output light sampling units in the n replication links. The control module sequentially selects the input terminals of the n×1 optical switch corresponding to each replication link to detect the reflected light power of the output port of each replication link in a time-division manner.

[0011] A further technical solution is that the first-stage beam splitting module includes a first-stage beam splitter, the input end of which is connected to the main link, and the auxiliary beam splitting end of which is directly connected to the second-stage beam splitting module.

[0012] A further technical solution is that the first-stage beam splitting module includes a first-stage beam splitter and a first-stage amplifier. The input end of the first-stage beam splitter is connected to the main link, and the auxiliary beam splitting end of the first-stage beam splitter is connected to the second-stage beam splitting module through the first-stage amplifier.

[0013] A further technical solution is that the sum of the gain Gi of the SOA device and the gain G0 of the first-stage amplifier in any copy link is equal to the total link loss IL to be compensated, and |G0-Gi|≤ the gain difference threshold.

[0014] A further technical solution is that the replication link also includes an input optical sampling unit and an input optical power detection unit; In any replication link, the input optical sampling unit, SOA device, reflected light and output optical sampling unit and output port are connected in sequence, and the input optical power detection unit is connected to the input optical sampling unit.

[0015] A further technical solution is that when the control module determines that the output port is in a floating state, it issues a floating alarm; when the control module determines that the output port is in an abnormal or normal connection state, if the subsequent device connected to the output port cannot obtain information, it issues an abnormal alarm.

[0016] The beneficial technical effects of this invention are: This invention achieves gain amplification and link shutdown functions through SOA device multiplexing, effectively reducing the number of devices and system complexity; This invention collects the reflected light power of each replication link output port to calculate the return loss, determines the port status based on the return loss and reports it (floating, abnormal connection or normal status), thereby solving the problem in the prior art that replication link ports cannot be automatically identified and reported when they are not connected to downstream devices. Furthermore, the replication link can be shut down in a timely manner based on the port status, which can promptly detect and resolve potential risks such as unauthorized port access and leakage of security information, thus improving system security.

[0017] Furthermore, an n×1 optical switch can be used in a round-robin manner to detect the reflected power of multiple output ports, allowing multiple replica links to share a single reflected optical power detection unit, which can further reduce the number of power detection devices in the system.

[0018] This invention can also retain only the SOA devices in the replicated link after the second-level optical splitter to compensate for link loss, thereby further reducing the input optical power of the SOA devices, enabling the SOA to operate in the linear region, and the SOA devices in each replicated link can be independently controlled, effectively improving system performance. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of an existing spectroscopic amplification product without disconnection function provided by the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of an existing spectroscopic amplification product with a shutdown function provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a first embodiment of the optical splitting link system provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of a second embodiment of the optical splitting link system provided by the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the optical splitting link system provided by the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of Embodiment 4 of the optical splitting link system provided by the present invention. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0026] like Figure 1-2 As shown, among the currently known optical splitter amplification products, those without a shutdown function cannot shut down the replication link when the output port is not connected to a downstream device (i.e., the output port is floating). While optical splitter amplification products with a shutdown function can shut down the replication link, they cannot automatically identify and report the status of the output port, and cannot control the shutdown based on the port status, posing risks such as unauthorized port access and leakage of security information.

[0027] To address the above problems, this invention provides a splitter link system with port status identification and shutdown functions, comprising: The primary optical splitter module is used to split the optical signal from the main link to obtain the auxiliary optical signal; A secondary beam splitter module, connected to the primary beam splitter module, is used to split the auxiliary optical signal into n replica links for output, where n is a positive integer greater than 1. Each replica link includes an SOA (Semiconductor Optical Amplifier) ​​device, a reflected light and output light sampling unit, and an output port. The reflected light power detection module is connected to the reflected light and output light sampling unit in each replication link and is used to detect the reflected light power at the output port of each replication link. The control module is used to determine the port status of each output port based on the reflected light power detected by the reflected light power detection module. Configure the power supply polarity of the corresponding SOA device according to the port status of each output port, so as to control the SOA device to realize the gain amplification function or the link shutdown function.

[0028] Specifically, when the power supply polarity of the SOA device is positive, it achieves gain amplification; when the power supply polarity of the SOA device is negative, it achieves link shutdown. By switching the power supply polarity of the SOA device to achieve gain amplification and link shutdown, compared with the existing technology of separating the amplifier and shutdown device, it can effectively reduce the number of devices, simplify the optical path structure, and reduce the system control complexity and cost.

[0029] Furthermore, each replication link also includes an output optical power detection unit connected to the reflected light and output light sampling unit, used to detect the output optical power of each replication link output port; the control module calculates the return loss of each output port based on the output optical power and reflected light power of each output port, and determines the port status based on the return loss of each output port. When the return loss is less than or equal to the first threshold, the control module determines that the output port is in a floating state. When the return loss is between the first threshold and the second threshold (the first threshold is less than the second threshold), the control module determines that the output port is in a connection abnormal state. When the return loss is greater than or equal to the second threshold, the control module determines that the output port is in a normal state.

[0030] When the control module determines that the output port is in a floating state, it issues a floating alarm; when the control module determines that the output port is in an abnormal or normal connection state, if the downstream device connected to the output port cannot obtain information, it issues an abnormal alarm.

[0031] The replication link also includes an input optical sampling unit and an input optical power detection unit; in any replication link, the input optical sampling unit, SOA device, reflected light and output optical sampling unit, and output port are connected in sequence, and the input optical power detection unit is connected to the input optical sampling unit. The specific structure of the optical splitting link system is described in detail below with reference to specific embodiments. The specific calculation method for the return loss can be found in the following embodiments.

[0032] Example 1 Please refer to Figure 3In Embodiment 1, the first-stage beam splitting module includes a first-stage beam splitter (1) and a first-stage amplifier, and the second-stage beam splitting module includes a second-stage beam splitter (2) and multiple replication links. The input end of the first-stage beam splitter (1) is connected to the main link, and the auxiliary beam splitting end of the first-stage beam splitter (1) is connected to the input end of the second-stage beam splitter (2) through the first-stage amplifier. Further, the first-stage beam splitting module also includes a first-stage sampling beam splitter (1-1) and a first-stage input optical power detector (P1-1). The first-stage sampling beam splitter (1-1) is connected between the first-stage beam splitter (1) and the first-stage amplifier. The input end of the first-stage sampling beam splitter (1-1) is connected to the auxiliary beam splitting end of the first-stage beam splitter (1). The main beam splitting end of the first-stage sampling beam splitter (1-1) is connected to the input end of the first-stage amplifier. The auxiliary beam splitting end of the first-stage sampling beam splitter (1-1) is connected to the first-stage input optical power detector (P1-1). The output end of the first-stage amplifier is connected to the input end of the second-stage beam splitter (2). The primary splitter (1) separates the main link from the secondary link. It is a 1×2 non-uniform splitter. For example, the splitting ratio of its main and secondary splitting ends can be 80:20. The secondary splitter (2) can be a 1×n uniform splitter with n splitting ends. Each splitting end is connected to a replica link. In practical applications, the secondary splitter (2) can generally be a 1×4 uniform splitter, that is, the splitting ratio of each splitting end of the secondary splitter (2) is 25:25:25:25.

[0033] Example 1 shows n replication links. The reflected light power detection module includes n reflected light power detection units corresponding to the n replication links. Each reflected light power detection unit is connected to the reflected light and output light sampling unit in the corresponding replication link to detect the reflected light power of each output port.

[0034] Taking the first replication link as an example, the input optical sampling unit is the input optical sampling splitter (3-1), the input optical power detection unit is the input optical power detector (P3-1), and the SOA device is... Figure 3 The off and gain device 1 shown is a reflection and output light sampling unit, which is a reflection and output light sampling splitter (4-1), a reflection light power detection unit, which is a reflection light power detector (P4-11), and an output light power detection unit, which is an output light power detector (P4-1).

[0035] The input light sampling splitter (3-1) is a 1×2 splitter, and its auxiliary path splitting ratio is generally 1~5%, that is, the output optical power ratio between the auxiliary splitting end and the main splitting end is 1 / 99~5 / 95. The reflected light and output light sampling splitter (4-1) is a 2×2 splitter, and its auxiliary path splitting ratio is generally 1~2%, that is, the input / output optical power ratio between the auxiliary input end / splitter and the main input end / splitter is 1 / 99~1 / 98, preferably 1 / 99. The input end of the input light sampling splitter (3-1) is connected to one splitting end of the secondary splitter (2), the main splitting end of the input light sampling splitter (3-1) is connected to the input end of the turn-off & gain device 1, and the auxiliary splitting end of the input light sampling splitter (3-1) is connected to the input optical power detector (P3-1), which is used to detect the input optical power of the replication link. The output terminal of the turn-off & gain device 1 is connected to the main input terminal of the reflected and output light sampling splitter (4-1), and the main splitting terminal and output port of the reflected and output light sampling splitter (4-1) are connected to each other. Figure 3 Output 1) Connection. The reflected light power detector (P4-11) is connected to the auxiliary input terminal of the reflected light and output light sampling splitter (4-1) to detect the reflected light power P at the output port. 4-11 The output optical power detector (P4-1) is connected to the auxiliary beam splitter (4-1) of the reflected and output light sampling beam splitter, and is used to detect the output optical power P at the output port. 4-1 All of the above power detectors can be photodiodes.

[0036] Taking the first replication link as an example, when the output signal is transmitted through the output port of the replication link, the reflected light generated at its end face and in the subsequent system enters the reflected light power detector (P4-11) through the auxiliary input terminal of the reflected light and output light sampling splitter (4-1). According to the Fresnel reflection principle, when the output port is the UPC (Ultra Physical Contact) end face and is in a suspended state, the end face reflection coefficient is (n1-n2)² / (n1+n2)², where n1 is the refractive index of the fiber end face (taken as 1.5) and n2 is the refractive index of air (taken as 1.0). The typical reflection coefficient when the port is suspended is calculated to be 0.04. Therefore, the typical return loss RL when the port is suspended can be expressed as -10×log 10 (0.04)≈14dB. If other jumpers are connected to the end face, the reflection coefficient will be significantly reduced, and the reflections in the subsequent system will also be superimposed. That is, the power detected by the reflected light power detector (P4-11) is the superposition result of all subsequent reflected power of the output port. The actual return loss RL(actual) of the output port is calculated based on the output light power and reflected light power of the output port. 4-1 - P 4-11 .

[0037] In this embodiment, the first threshold and the second threshold are set to 16dB and 22dB, respectively. Specifically, when RL(actual) ≤ 16dB, the control module determines that the output port is in a floating state; when 16dB < RL(actual) < 22dB, the output port is determined to be in an abnormal connection state, that is, there is some reflection in the output port and its subsequent system connections, which has a significant impact on system performance and needs to be addressed promptly. When RL(actual) ≥ 22dB, the output port is determined to be in a normal state, that is, the reflection in the output port and its subsequent system connections is small and its impact on system performance is negligible. In actual implementation, the values ​​of each threshold can be flexibly set according to the actual application.

[0038] The control module is typically a network management system (NMS). The NMS can determine the status of each replication link output port using the aforementioned method and configure it remotely. For example, if the NMS has already assigned output port 1 to connect to a subsequent device, under normal use and without other alarms, it calculates the actual RL (Relative Power Count) of output port 1. If output port 1 is determined to be in a floating state, a floating alarm is issued to indicate that output port 1 is in a floating state. At this time, output port 1 can be shut down by configuring the power supply polarity of the corresponding SOA device to reverse. If output port 1 is determined to be in an abnormal or normal connection state, and the subsequent device cannot normally obtain detection information (information should have been received but was not), an abnormal alarm is issued. This indicates that output port 1 may be being used without authorization (connected to other devices), there may be a connection error, excessive system reflection, etc., prompting on-site inspection. Simultaneously, output port 1 can be shut down by configuring the power supply polarity of the corresponding SOA device to reverse. After output port 1 is remotely shut down, its actual RL can be configured to a special value to indicate that it is in a shut-down state.

[0039] In any replicated link, the sum of the gain Gi of the SOA device and the gain G0 of the first-stage amplifier is equal to the total link loss IL that needs to be compensated. The total link loss IL mainly includes the loss IL1 of the first-stage beam splitter (1), the loss IL2 of the second-stage beam splitter (2), and the loss IL0 of other devices. G0 and Gi need to be considered in a balanced way. Ideally, G0 = Gi. In actual settings, |G0-Gi| ≤ the gain difference threshold. In this embodiment, the gain difference threshold can be set to 2dB, which means that the range of G0 and Gi is [IL / 2-1, IL / 2+1]. In addition, in this embodiment, the first-stage amplifier is also an SOA device (the same as the SOA device in the replicated link), and the gain range is [6, 8]dB. At this time, the SOA device can work in the linear region, thereby effectively improving the system performance.

[0040] As an example, when the splitting ratio of the main and auxiliary splitting ends of the first-stage beam splitter (1) is 80:20, and the second-stage beam splitter (2) is a 1×4 equal-split beam splitter, the values ​​of IL0-2 can be: IL0=1dB, IL1=7dB, IL2=6dB, so IL=14dB. Taking the gain G1 of the turn-off and gain devices in the first replication link as an example, G0=G1=7dB can be taken at this time. The typical input power of the first-stage beam splitter (1) is 4dBm, the input power entering the first-stage amplifier is about -3dBm, and the typical power after amplification is 4dBm; the typical input power entering the turn-off and gain devices is -3dBm, and the typical power after amplification remains unchanged at 4dBm. At this time, the first-stage amplifier and the turn-off and gain devices are both working in the linear region. It should be noted that the above loss values, i.e., typical power values, are only examples. In specific implementation, each loss value and power value can be further determined in detail according to the actual use environment.

[0041] Example 2 In Example 1, each output port of the replication link uses an independent reflected light power detector (P4-11~P4-1n) to detect reflected light power. Unlike input and output light power detection, reflected light power detection does not require rapid real-time reporting; reporting at the second level is generally sufficient. Therefore, to reduce the number of devices used, in Example 2, the reflected light power detection module includes a reflected light power detection unit and an n×1 optical switch, such as... Figure 4 As shown, the reflected light power detection unit, i.e., the reflected light power detector (P4-11), is connected to the output terminal of an n×1 optical switch. The n input terminals of the n×1 optical switch are connected one-to-one with the reflected light and output light sampling units in the n replication links, specifically connected to the auxiliary input terminals of the n reflected light and output light sampling splitters (4-1~4-n). The control module sequentially selects the input terminals of the n×1 optical switch corresponding to each replication link, so that the reflected light power detector (P4-11) detects the reflected light power of each output port in a time-division manner, thus achieving polling detection. The structure in Embodiment 2, except for the reflected light power detection module, is consistent with Embodiment 1 and will not be described again here.

[0042] Example 3 As a further improvement to Embodiment 1, the first-stage beam splitting module in Embodiment 3 only includes a first-stage beam splitter (1). The input end of the first-stage beam splitter (1) is connected to the main link, and the auxiliary beam splitting end of the first-stage beam splitter is directly connected to the second-stage beam splitting module. That is, the amplifier after the first-stage beam splitting is no longer needed, and the gain is only provided by the shutdown and gain devices in each replica link. At this time, the gain provided by the shutdown and gain devices in each replica link is equal to the total link loss that needs to be compensated. For example, IL0-2 is the same as in Embodiment 1, that is, when IL=14dB, Gi=14dB.

[0043] Since the amplifier in the first-stage beam splitter module is removed in Embodiment 3, the input power of the shutdown and gain devices entering the replication link is smaller than that in Embodiment 1. Specifically, the difference is equal to the loss IL1 of the first-stage beam splitter (1). At this time, the input power of the shutdown and gain devices is lower, and the gain is about 14dB higher. There is no need to perform gain allocation for G0 and Gi, so the shutdown and gain devices can work stably in the linear region, which can effectively improve the system performance. The other structures in Embodiment 3, except for the first-stage beam splitter module, are the same as those in Embodiment 1, and will not be described in detail here.

[0044] Example 4 As a further improvement to Embodiment 3, in Embodiment 4, the reflected light power detection module includes a reflected light power detection unit and an n×1 optical switch. The reflected light power detection unit, i.e., the reflected light power detector (P4-11), is connected to the output terminal of the n×1 optical switch. The n input terminals of the n×1 optical switch are connected one-to-one with the reflected light and output light sampling units in the n replication links, specifically connected to the auxiliary input terminals of the n reflected light and output light sampling splitters (4-1~4-n). The control module sequentially selects the input terminals of the n×1 optical switch corresponding to each replication link, so that the reflected light power detector (P4-11) detects the reflected light power of each output port in a time-division manner, i.e., polling detection is achieved. The other structures in Embodiment 4, except for the reflected light power detection module, are consistent with Embodiment 3 and will not be described in detail here.

[0045] To facilitate understanding, the present invention also provides a table of typical power values ​​for existing solutions and the above embodiments: Table 1. Typical Power Value Calculation Table

[0046] Based on the above embodiments and the table above, it can be seen that in Embodiments 3 and 4, by removing a first-stage amplifier, the input power of the shutdown and gain devices in the replication link is reduced, the gain is increased, and they can operate stably in the linear region, thereby ensuring constant gain, no signal distortion, and improving the transmission quality and stability of the system.

[0047] In summary, this invention achieves gain amplification and link shutdown functions through SOA device multiplexing, effectively reducing the number of devices and system complexity. Furthermore, by collecting the reflected light power of each replicated link output port to calculate the return loss, and determining whether the port is floating, abnormally connected, or in normal condition based on the return loss, the invention reports this information. This solves the problem of not being able to obtain the port status of replicated links in the prior art, and allows for timely shutdown control of replicated links based on port status, promptly detecting and resolving potential risks such as unauthorized port access and security information leakage, thereby improving system security.

[0048] Furthermore, an n×1 optical switch can be used in a round-robin manner to achieve multi-output port reflected power detection, with multiple replicated links sharing a single reflected optical power detection unit, further reducing the number of power detection devices. Moreover, by retaining only the SOA device in the replicated link after the second-stage beam splitter to compensate for link losses, the SOA input optical power can be further reduced, allowing it to operate in the linear region to ensure constant gain and no signal distortion, thus further improving system performance.

[0049] In the description of this specification, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] The use of terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example, which is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] The above description is merely a preferred embodiment disclosed in this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this disclosure.

Claims

1. A split-link system with port status identification and shutdown functions, characterized in that, include: The primary optical splitter module is used to split the optical signal from the main link to obtain the auxiliary optical signal; A secondary beam splitter module, connected to the primary beam splitter module, is used to split the auxiliary optical signal into n replica links for output. Each replica link includes an SOA device, a reflected light and output light sampling unit, and an output port. The reflected light power detection module is connected to the reflected light and output light sampling unit in each replication link and is used to detect the reflected light power at the output port of each replication link. The control module is used to determine the port status of each output port based on the reflected light power detected by the reflected light power detection module. Configure the power supply polarity of the corresponding SOA device according to the port status of each output port, so as to control the SOA device to realize the gain amplification function or the link shutdown function.

2. The optical splitter link system with port status identification and shutdown function according to claim 1, characterized in that, Each replication link also includes an output optical power detection unit connected to the reflected light and output light sampling unit, used to detect the output optical power of each replication link's output port; The control module calculates the return loss of each output port based on the output optical power and reflected optical power of each output port, and determines the port status based on the return loss of each output port.

3. The optical splitter link system with port status identification and shutdown function according to claim 2, characterized in that, When the return loss is less than or equal to the first threshold, the control module determines that the output port is in a floating state. When the return loss is between the first threshold and the second threshold, the control module determines that the output port is in a connection abnormal state. When the return loss is greater than or equal to the second threshold, the control module determines that the output port is in a normal state.

4. The optical splitter link system with port status identification and shutdown function according to claim 1, characterized in that, The reflected light power detection module includes n reflected light power detection units corresponding one-to-one with n replica links, and each reflected light power detection unit is connected to the reflected light and output light sampling unit in the corresponding replica link to detect the reflected light power of each output port.

5. The optical splitter link system with port status identification and shutdown function according to claim 1, characterized in that, The reflected light power detection module includes a reflected light power detection unit and an n×1 optical switch. The reflected light power detection unit is connected to the output terminal of the n×1 optical switch. The n input terminals of the n×1 optical switch are connected one-to-one with the reflected light and output light sampling units in the n replication links. The control module sequentially selects the input terminals of the n×1 optical switch corresponding to each replication link to detect the reflected light power of the output port of each replication link in a time-division manner.

6. The optical splitter link system with port status identification and shutdown function according to claim 1, characterized in that, The primary beam splitting module includes a primary beam splitter, the input end of which is connected to the main link, and the auxiliary beam splitter of which is directly connected to the secondary beam splitting module.

7. The optical splitter link system with port status identification and shutdown function according to claim 1, characterized in that, The primary beam splitting module includes a primary beam splitter and a primary amplifier. The input end of the primary beam splitter is connected to the main link, and the auxiliary beam splitting end of the primary beam splitter is connected to the secondary beam splitting module through the primary amplifier.

8. The optical splitter link system with port status identification and shutdown function according to claim 7, characterized in that, In any replicated link, the sum of the gain Gi of the SOA device and the gain G0 of the first-stage amplifier is equal to the total link loss IL that needs to be compensated, and |G0-Gi|≤ the gain difference threshold.

9. The optical splitter link system with port status identification and shutdown function according to claim 7, characterized in that, The replication link also includes an input optical sampling unit and an input optical power detection unit; In any replication link, the input optical sampling unit, SOA device, reflected light and output optical sampling unit and output port are connected in sequence, and the input optical power detection unit is connected to the input optical sampling unit.

10. The optical splitter link system with port status identification and shutdown function according to claim 3, characterized in that, When the control module determines that the output port is in a floating state, it issues a floating alarm; when the control module determines that the output port is in an abnormal or normal connection state, if the downstream device connected to the output port cannot obtain information, it issues an abnormal alarm.

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