Visual optical splitter, optical distribution network, and optical distribution system

Abstract

A visual optical splitter (16), an optical distribution network (15), and an optical distribution system. The visual optical splitter (16) comprises doped optical waveguides (7) configured to receive an optical detection signal and adjust the power of a service optical signal, and the amounts of change in power to the service optical signal by different doped optical waveguides (7) are different; and filters (8) each configured to selectively transmit, block, or reflect an optical detection signal of a preset central wavelength and to transmit the service optical signal, each filter being embedded within a doped optical waveguide (7).

Description

Visualizing optical splitter, optical distribution network, and optical distribution system

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410413654.0, filed on April 8, 2024, with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to, but is not limited to, the field of communication technology. BACKGROUND

[0004] Passive optical network (PON) is a point-to-multipoint network that can provide higher bandwidth, mainly including an optical line terminal (OLT) at the central office, an optical network unit (ONU) or an optical network termination (ONT) at the user side, and an optical distribution network (ODN). Compared with the point-to-point topology, PON can reduce the cost of optical fibers, but the structure of PON is complex, which is not conducive to fault detection and topology visualization.

[0005] The ODN includes an optical splitter, which includes a filter and a power variation component. The filter is configured to turn off or turn on optical signals of a certain wavelength, and the power variation component is configured to adjust the power of service optical signals. In the ODN, the output port of each optical splitter corresponds to a different power variation component, and the power change of the service optical signal can be used to determine the output port of the optical splitter, thereby achieving fault detection and topology visualization. However, the filter and the power variation component are independent components, which leads to a complex structure of the optical splitter and a high assembly difficulty. Moreover, in order to achieve power adjustment of different service optical signals by the power variation component, the performance of each power variation component is different, and thus the preparation method of each power variation component is different, which increases the preparation cost of the optical splitter. SUMMARY

[0006] In a first aspect, an embodiment of the present disclosure provides a visualizing optical splitter, comprising: a doped optical waveguide configured to receive an optical detection signal and adjust the power of a service optical signal, different doped optical waveguides having different power change amounts of the service optical signal; and a filter configured to select to pass, block or reflect the optical detection signal of a preset central wavelength, and pass the service optical signal, the filter being embedded in the doped optical waveguide.

[0007] In a second aspect, the embodiments of the present disclosure provide an optical distribution network, comprising a visual splitter, wherein the visual splitter is any of the visual splitters described herein.

[0008] In a third aspect, the embodiments of the present disclosure provide an optical distribution system, comprising: an optical detection signal module configured to generate an optical detection signal; an optical line terminal configured to send a service optical signal; an optical network terminal configured to receive the service optical signal; and an optical distribution network configured to connect the optical line terminal, the optical detection signal module and the optical network terminal, wherein the optical distribution network is any of the optical distribution networks described herein. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a schematic diagram of a passive optical network;

[0010] Fig. 2 is a schematic diagram of a visual splitter according to an embodiment of the present disclosure;

[0011] Fig. 3 is a schematic diagram of another visual splitter according to an embodiment of the present disclosure;

[0012] Fig. 4 is a schematic diagram of yet another visual splitter according to an embodiment of the present disclosure;

[0013] Fig. 5 is a schematic diagram of still another visual splitter according to an embodiment of the present disclosure;

[0014] Fig. 6 is a schematic diagram of an optical distribution system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0015] In order to make the skilled in the art better understand the technical solutions of the present disclosure, the splitter, the optical distribution network and the optical distribution system provided by the present disclosure are described in detail below with reference to the drawings.

[0016] In the following, the example embodiments will be described more fully with reference to the accompanying drawings, in which example embodiments can, however, be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to the skilled in the art.

[0017] The embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0018] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0019] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0021] In the present disclosure, the following technical terms should be understood as follows, unless otherwise specified:

[0022] Wavelength Division Multiplexing (WDM) module refers to a technology that combines two or more different wavelength optical signals (carrying information) at the sending end through a multiplexer and couples them into an optical waveguide for transmission; at the receiving end, different wavelength optical signals are separated by a demultiplexer, and then further processed by an optical receiver to recover the original signal. This technology of transmitting two or more different wavelength optical signals in the same optical fiber at the same time is called wavelength division multiplexing. Wavelength division multiplexer is based on wavelength division multiplexing technology to transmit optical signals.

[0023] Optical splitter is a junction device with one or more input ports and multiple output ports. The optical splitter usually distributes the power to multiple links after splitting according to the corresponding proportion.

[0024] Filter refers to a device that selects wavelengths, which can select or filter the required wavelength from multiple wavelength optical signals.

[0025] Doped optical waveguide refers to an optical waveguide doped with a specific element, which absorbs different wavelength optical signals according to the intrinsic parameters of the doped element. The doped element can be erbium ions, thulium ions, neodymium ions, or erbium-ytterbium co-doped, etc., which are not limited by the present application. It should be noted that the type of doped elements, the content of doped elements, and the length of doped optical waveguide all affect the absorption of input optical signals.

[0026] Figure 1 is a schematic diagram of a passive optical network. As shown in Figure 1, the passive optical network (PON) includes a tunable wavelength optical time-domain reflectometer (OTDR) 1, a PON optical line terminal (OLT) 13, an optical distribution network (ODN) 15, and an ONT 14, wherein the OTDR 1 is configured to generate an optical detection signal, the PON OLT 13 is configured to generate a service optical signal, and the OTDR 1 and the PON OLT 13 are connected to the ONT 14 through the ODN 15. The ODN 15 includes a wavelength division multiplexing module 5 and an optical splitter 6. The optical splitter 6 includes a plurality of branch ports, each of which is connected to an ONT 14. The optical detection signal generated by the OTDR 1 is transmitted to the ONT 14 after passing through the wavelength division multiplexing module 5 and the optical splitter 6 in turn.

[0027] In order to visualize the topology of the PON, the optical splitter 6 includes a filter 8 and a power variation component, the filter 8 is configured to turn off or turn on optical signals of a certain wavelength, and the power variation component is configured to adjust the power of the service optical signal. The amount of change in the power of the service optical signal is used to determine the correspondence between the branch ports of the visualized optical splitter and the ONT 14, thereby realizing the visualization of the topology of the PON.

[0028] In a first aspect, the embodiments of the present disclosure provide a visualized optical splitter.

[0029] Figure 2 is a schematic diagram of a visualized optical splitter according to an embodiment of the present disclosure. As shown in Figure 2, the visualized optical splitter includes a doped optical waveguide 7 configured to receive an optical detection signal and adjust the power of a service optical signal, and different doped optical waveguides 7 have different amounts of change in the power of the service optical signal; and a filter 8 configured to select through, block, or reflect an optical detection signal of a preset central wavelength, i.e., the filter 8 can select through, block, or reflect an optical detection signal of a preset central wavelength. Each filter 8 can select through, block, or reflect an optical detection signal of a specific central wavelength. For example, the filter selects through an optical detection signal of a first central wavelength while blocking optical detection signals of other central wavelengths; for another example, the filter blocks an optical detection signal of a second central wavelength while selecting through optical detection signals of other central wavelengths. While selecting through, blocking, or reflecting an optical detection signal of a preset central wavelength, the filter 8 can select through a service optical signal, i.e., the service optical signal is not affected by the filter 8.

[0030] In some embodiments, the filter 8 is embedded in the doped optical waveguide 7. In some embodiments, the filter 8 is embedded in the doped optical waveguide 7 and is integrated with the doped optical waveguide 7. When the doped optical waveguide 7 is manufactured, the filter 8 can be embedded in the doped optical waveguide 7 at the same time, so that the filter 8 is integrated with the doped optical waveguide 7.

[0031] In some embodiments, the filter 8 includes a Bragg grating etched in the doped optical waveguide 7.

[0032] In some embodiments, the doped optical waveguide 7 includes an optical waveguide and a doping element doped in the optical waveguide. The optical waveguide includes an optical fiber or a planar waveguide. The doping element in the doped optical waveguide 7 includes one or more of erbium, thulium, and rubidium.

[0033] When the visualized optical spectrum analyzer is manufactured, the doped optical waveguide 7 is manufactured first, and then the Bragg grating is etched in the doped optical waveguide 7 through an etching process, so that the Bragg grating and the doped optical waveguide 7 are processed at one time.

[0034] In some embodiments, the filter 8 is embedded in any position of the doped optical waveguide 7, such as the front section, the middle section, or the tail section of the doped optical waveguide 7. The front section refers to the position close to the light-in side of the doped optical waveguide 7, such as one-third of the doped optical waveguide 7 from the light-in side, as shown in FIG. 2. The middle section refers to the middle position of the doped optical waveguide 7, such as one-third to two-thirds of the doped optical waveguide 7 from the light-in side, as shown in FIG. 3. The tail section refers to the position close to the light-out side of the doped optical waveguide 7, such as two-thirds of the doped optical waveguide 7 from the light-in side to the light-out side, as shown in FIG. 4.

[0035] In some embodiments, the visualized optical spectrum analyzer includes one common port and at least two branch ports, each of the at least two branch ports corresponding to one doped optical waveguide 7 and one filter 8. The filter corresponding to each branch port is located at the same position or different positions of the doped optical waveguide. For example, all the filters 8 are located at the front section, the middle section, or the tail section of the doped optical waveguide 7, as shown in FIGS. 2 to 4; or different filters 8 are located at different positions of the doped optical waveguide 7, as shown in FIG. 5.

[0036] In the embodiments of the present disclosure, the doped optical waveguides 7 corresponding to different branch ports have the same structure, which simplifies the structure of the visualized optical spectrum analyzer and reduces the manufacturing cost of the doped optical waveguide 7, thereby reducing the manufacturing cost of the visualized optical spectrum analyzer. Moreover, different filters 8 can be processed at one time through an etching process, thereby reducing the manufacturing cost of the filter 8.

[0037] As shown in Fig. 2, the visualizing optical splitter comprises one common port 9 and at least two branch ports 10, each of the at least two branch ports 10 corresponding to one doped optical waveguide 7 and one filter 8 embedded in the doped optical waveguide 7.

[0038] In some embodiments, when the optical detection signal is of adjustable wavelength, the filters corresponding to different branch ports are of different central wavelengths and are embedded in the same position of the doped optical waveguide. Even if the filters corresponding to different branch ports are embedded in the same position of the doped optical waveguide, since the central wavelengths of the optical detection signals allowed to pass by the filters are different, the optical detection signals of different central wavelengths have different influences on the power variation of the service optical signal (different branch ports), and thus the power gain or attenuation of the service optical signal received by the optical network terminal is different. The power gain or attenuation of the service optical signal can be used to determine the central wavelength of the optical detection signal, the filter can be determined according to the central wavelength of the optical detection signal, and the branch port connected by the optical network terminal can be determined according to the filter.

[0039] As shown in Fig. 2, the visualizing optical splitter comprises one common port 9 and eight branch ports 10, the common port 9 is configured to receive an optical signal, at least part of the branch ports 10 are each signal connected to an ONT, a doped optical waveguide 7 and a filter 8 are arranged between the branch ports 10 and the ONT, and all the filters 8 are embedded in the front section of the doped optical waveguide 7 and are in the same position. The optical signal (detection optical signal and / or service optical signal) is transmitted to the ONT through the doped optical waveguide 7 and the filter 8.

[0040] In the above embodiments, the length of the doped optical waveguide 7 is the same, the doping element is the same, and the doping concentration is the same; or the length of the doped optical waveguide 7 is the same, the doping element is different, and the doping concentration is the same; or the length of the doped optical waveguide 7 is the same, the doping element is the same, and the doping concentration is different; or the length of the doped optical waveguide 7 is the same, the doping element is different, and the doping concentration is different. In this way, the change amount of the power of the service optical signal by different doped optical waveguides 7 is different, so that the change amount of the power of the service optical signal and the branch port 10 exist a corresponding relationship. The structures of different filters 8 are the same, but the selection of the wavelength of the detection optical signal by different filters 8 is different.

[0041] For example, as shown in FIG. 3, the visualized optical splitter includes one common port 9 and eight branch ports 10, the common port 9 is configured to receive the optical signal, and each branch port 10 is connected with one ONT signal, a doped optical waveguide 7 and a filter 8 are arranged between the branch port 10 and the ONT, all the filters 8 are embedded in the middle section of the doped optical waveguide 7 and have the same position. The optical signal (the detection optical signal and / or the service optical signal) is transmitted to the ONT through the doped optical waveguide 7 and the filter 8. Compared with the visualized optical splitter shown in FIG. 2, the structure of the doped optical waveguide 7 and the filter 8 shown in FIG. 3 is the same as that shown in FIG. 2, and will not be described here.

[0042] In some embodiments, in the case of single-wavelength optical detection signal, the filters corresponding to the same center wavelength of different branch ports are different in the embedded position of the doped optical waveguide, that is, the center wavelength of the filter arranged in each branch port is the same. The center wavelength of the filter refers to the center wavelength of the optical detection signal selected by the filter. For example, if the center wavelength of the optical detection signal allowed to pass through the filter is the wavelength of the first waveband, then the center wavelength of the filter is the wavelength of the first waveband. For another example, if the center wavelength of the optical detection signal reflected by the filter is the wavelength of the second waveband, then the center wavelength of the filter is the wavelength of the second waveband. In some embodiments, the single-wavelength optical detection signal can be a fixed-wavelength PUMP light.

[0043] As shown in FIG. 5, the visualized optical splitter includes one common port 9 and eight branch ports 10, the common port 9 is configured to receive the optical signal, and each branch port 10 is provided with a doped optical waveguide 7 and a filter 8, the filter 8 corresponding to each branch port 10 is different in the embedded position of the doped optical waveguide 7, so that the length of the doped optical waveguide 7 before the filter 8 (from the front end of the doped optical waveguide 7 to the light-in surface of the filter 8) is different, thereby making the change amount of the power of the service optical signal for each doped optical waveguide 7 different, and further making the branch port 10 one-to-one corresponding to the change amount of the power of the service optical signal.

[0044] The visualized optical splitter provided by the present disclosure simplifies the structure of the visualized optical splitter because the filter is embedded in the doped optical waveguide and has an integrated structure with the doped optical waveguide, and the adjustment of the position of the filter in the doped optical waveguide does not need to adjust the structure of the doped optical waveguide, so that the adjustment of the power of the service optical signal by the doped optical waveguide can be utilized to realize the visualization of the optical splitter.

[0045] In a second aspect, the embodiments of the present disclosure provide an optical distribution network, which can be applied to the optical distribution system. For the convenience of description, the optical distribution network is introduced below by taking the optical distribution system as an example.

[0046] Fig. 6 is a structural schematic diagram of an optical distribution system according to an embodiment of the present disclosure. As shown in Fig. 6, the optical distribution system includes an optical detection signal module, a PON OLT 13, an optical network terminal (ONT) 14, and an optical distribution network (ODN) 15. The optical detection signal module is configured to generate an optical detection signal. The PON OLT 13 is configured to send a service optical signal. The ONT 14 is configured to receive the service optical signal. The ODN 15 is configured to connect the optical detection signal module, the PON OLT 13, and the ONT 14 to each other.

[0047] In some embodiments, the optical detection signal includes a pump optical signal and / or an OTDR signal with adjustable wavelength. When the optical detection signal is the pump optical signal, the optical detection signal module includes a pump light source 11 configured to send the pump optical signal. When the optical detection signal is the OTDR signal with adjustable wavelength, the optical detection signal module includes an adjustable-wavelength OTDR transceiver 12 configured to send and receive the OTDR signal with adjustable wavelength.

[0048] In the embodiments of the present disclosure, the ODN 15 includes a visual splitter 16. The visual splitter 16 is a visual splitter according to an embodiment of the present disclosure. The structure of the visual splitter is described above and will not be repeated here.

[0049] In some embodiments, the optical distribution network further includes a backbone fiber, a distribution fiber, a branch fiber, and an N-level visual splitter, where N is a positive integer. The backbone fiber is connected to an input end of a first-level visual splitter in the N-level visual splitter. The branch fiber is connected to an output end of an N-level visual splitter in the N-level visual splitter. The distribution fiber is connected to an output end of an (n-1)-level visual splitter and an input end of an n-level visual splitter in the N-level visual splitter, where n is a positive integer greater than 1 and less than or equal to N.

[0050] For example, as shown in FIG. 6, the optical distribution network includes two-stage visual splitters, i.e., a first-stage visual splitter and a second-stage visual splitter, both of which include eight branch ports. Among them, the common port of the first-stage visual splitter is connected to the backbone optical fiber before the doped optical waveguide 7 of the first-stage visual splitter, i.e., the backbone optical fiber is connected to the input end of the first-stage visual splitter in the N-stage visual splitter. The doped optical waveguide 7 of the first-stage visual splitter is connected to the distributed optical fiber before the doped optical waveguide 7 of the second-stage visual splitter, i.e., the distributed optical fiber is connected to the input end of the second-stage visual splitter. The branch optical fiber is connected to the output end of the N-stage visual splitter, i.e., the doped optical waveguide 7 of the second-stage visual splitter is connected to the branch optical fiber before the ONT 14.

[0051] When the optical distribution network only includes a one-stage visual splitter, the backbone optical fiber is connected to the input end of the visual splitter, the output end of the visual splitter is connected to the branch optical fiber, and the output end of the visual splitter can be connected to the ONT 14 through the branch optical fiber.

[0052] The optical distribution network provided by the embodiments of the present disclosure adopts the visual splitter provided by the embodiments of the present disclosure. Since the filter is embedded in the doped optical waveguide and is in an integrated structure with the doped optical waveguide, the structure of the visual splitter is simplified, thereby simplifying the structure of the optical distribution network. Moreover, adjusting the position of the filter in the doped optical waveguide can adjust the change amount of the doped optical waveguide to the power of the service optical signal, thereby realizing the visualization of the splitter and the visualization of the optical distribution network.

[0053] In a third aspect, the embodiments of the present disclosure provide an optical distribution system.

[0054] As shown in FIG. 6, the optical distribution system includes an optical detection signal module, a PON OLT 13, an optical network terminal (ONT) 14 and an optical distribution network (ODN) 15, wherein the optical detection signal module is configured to generate an optical detection signal, the PON OLT 13 is configured to send a service optical signal, the ONT 14 is configured to receive the service optical signal, and the ODN 15 is configured to connect the optical detection signal module, the PON OLT 13 and the ONT 14, i.e., the ODN 15 is configured to realize the interconnection between the optical detection signal module, the PON OLT 13 and the ONT 14. The ONT 14 receives and sends a Gigabit Passive Optical Network (G-PON) service signal or receives and sends a 10G Gigabit Passive Optical Network (XG-PON) XG-PON service signal. The ODN 15 adopts the optical distribution network provided in the above embodiments.

[0055] The optical detection signal module includes one or more of a pump light source 11 and an adjustable-wavelength OTDR transceiver unit 12. The pump light source 11 is configured to send a pump light signal, and the adjustable-wavelength OTDR transceiver unit 12 is configured to send and receive an adjustable-wavelength OTDR signal. Both the pump light signal and the adjustable-wavelength OTDR signal can serve as the optical detection signal.

[0056] In some embodiments, the pump light source 11 includes a pump light array configured to generate the pump light signal and an optical switch module configured to control the on-off of each pump light in the pump light array.

[0057] In some embodiments, the optical distribution system further includes a wavelength division multiplexer 17 configured to couple the service optical signal and the optical detection signal into the same optical waveguide. The embodiments do not limit the structure and model of the wavelength division multiplexer 17.

[0058] The optical distribution system provided by the embodiments of the present disclosure simplifies the structure of the visual splitter in the optical distribution network by embedding the filter in the doped optical waveguide and integrating the filter with the doped optical waveguide, thereby simplifying the structure of the visual splitter and the structure of the optical distribution system. Moreover, by adjusting the position of the filter in the doped optical waveguide, the change in the power of the service optical signal caused by the doped optical waveguide can be adjusted, thereby realizing the visualization of the splitter and the visualization of the optical distribution system.

[0059] The embodiments of the present disclosure provide a port identification method for an optical distribution system. Different visual splitters have different identification methods. The port identification methods of the optical distribution systems using different visual splitters are introduced below.

[0060] When the wavelength of the optical detection signal is a fixed wavelength, the gain value of the doped optical waveguide to the service optical signal is adjusted by the position of the filter in the doped optical waveguide, as shown in FIG. 5, so as to adjust the power of the downstream service optical signal, and the branch port is identified based on the change amount of the power of the downstream service optical signal, so as to realize the visualization of the optical distribution system.

[0061] For example, when the wavelength of the optical detection signal is a fixed wavelength, the port identification method of the optical distribution system can include the following steps S701-S705.

[0062] In step S701, the ONT receives the service optical signal and determines the first power of the service optical signal.

[0063] The first power of the service optical signal is the power of the service optical signal actually received by the ONT without the optical detection signal. The embodiments of the present disclosure do not limit the ONT to determine the first power of the service optical signal according to the service optical signal.

[0064] In step S702, the ONT obtains the service optical signal after the power adjustment by the doped optical waveguide, and determines the second power based on the service optical signal after the power adjustment.

[0065] In step S703, the ONT determines the first power change amount of the service optical signal based on the first power and the second power.

[0066] For example, the ONT calculates the difference between the first power and the second power to obtain the first power change amount of the service optical signal.

[0067] In step S704, the ONT determines whether the power gain of the service optical signal received by the ONT is caused by the detection optical signal based on the first power change amount of the service optical signal, the first threshold and the second threshold; wherein the first threshold and the second threshold are pre-set; and / or the ONT determines the connection relationship between the ONT and the branch port of the splitter according to the first power change amount of the service optical signal and the corresponding relationship between the power change amount and the doped optical waveguide connected in series with the branch port of the splitter.

[0068] In step S705, the topology of the ONT is determined based on the connection relationship between the ONT and the branch port of the splitter.

[0069] The length of the doped optical waveguide is adjusted by changing the filter position, and different lengths of doped optical waveguides do not need to be connected in series. The length of the doped optical waveguide corresponding to different branch ports determines the gain value of the downstream service optical signal, and the power variation of the service optical signal received by the ONT or ONU in the gain spectrum of the doped optical waveguide is different. The power variation of the different service optical signals received by different ONTs or ONUs can determine the corresponding doped optical waveguide, and the doped optical waveguide can determine the corresponding branch port, thereby determining the correspondence between the ONT or ONU and the branch port.

[0070] When the wavelength of the optical detection signal is the adjustable wavelength OTDR signal, the filter corresponding to different branch ports can select the center wavelength of the optical detection signal, and the filter corresponding to different branch ports can be arranged at the same position of the doped optical waveguide, as shown in FIG. 2. The optical detection signal with the same center wavelength as the filter wavelength can hardly pass through, but the service optical signal is hardly affected, while in other branch ports, the optical detection signal can pass through because the wavelength of the filter is different from the center wavelength of the optical detection signal. Therefore, the optical detection signal can amplify the gain of the service optical signal, and the power of the service optical signal received by the ONT or ONU changes, and the power variation value can be used to determine the filter corresponding to the ONT or ONU, and the filter can determine the corresponding branch port, thereby realizing the identification of the branch port of the visual splitter by the ONT.

[0071] For example, when the wavelength of the optical detection signal is the adjustable wavelength OTDR signal, the port identification method of the optical distribution system can include the following steps S801 to S805.

[0072] Step S801, the ONT receives the service optical signal from the optical line terminal, and determines the third power of the service optical signal.

[0073] Step S802, the ONT obtains the service optical signal after the power adjustment of the doped optical waveguide, and determines the fourth power based on the service optical signal after the power adjustment.

[0074] Step S803, the ONT determines the second power variation of the service optical signal based on the third power and the fourth power.

[0075] Step S804, the ONT determines the correspondence between the ONT and the branch port of the splitter according to the second power variation of the service optical signal and the correspondence between the center wavelength of the adjustable wavelength saturated absorption mode signal and the filter of the branch port of the splitter.

[0076] Step S805, based on the correspondence between the ONT and the branch port of the splitter, the topology of the ONT is determined.

[0077] When the wavelength of the light detection signal is the tunable wavelength of the pump light signal, the visualization can also be achieved by adjusting the transmittance of the filter.

[0078] For example, as shown in FIG. 3, filters of different transmittances r 1-8 are etched in the middle section of the doped optical waveguide. Due to the transmittance r i of the filter at the branch port i, the filter allows the pump light signal to pass through at a certain ratio r i . After passing through the filter, the doped optical waveguide behind the filter (right side of the filter in the figure) amplifies the power of the service light signal. The total power gain is the sum of the gain of the front doped optical waveguide and the gain of the rear doped optical waveguide. Since the transmittances of the filters corresponding to different branch ports are different, the power gain values of the service light signals corresponding to different branch ports are different. The ONU can identify the connected branch port through the different gain values.

[0079] The present disclosure provides a visualized optical splitter, an optical distribution network and an optical distribution system, which can simplify the structure of the optical splitter and reduce the manufacturing cost.

[0080] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the functions of the modules / units in the system and the device can be implemented as software, firmware, hardware and appropriate combinations thereof. In the hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as known to those skilled in the art, communication media typically includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

[0081] Example embodiments have been disclosed herein and, although the specific terms are employed, they are used in a generic sense only and should not be construed to be limited to the specific embodiments described herein. In some instances, those of ordinary skill in the art will appreciate that a feature, structure, or characteristic described in connection with a particular embodiment can be used in connection with another embodiment unless expressly mixed in contradiction thereto. Changes in form and detail can be made without departing from the scope of the disclosure as set forth in the accompanying claims.

Claims

1. A visual spectrometer, comprising: a doped optical waveguide configured to receive the optical detection signal and adjust the power of the service optical signal, wherein different doped optical waveguides change the power of the service optical signal by different amounts; The filter is configured to selectively pass, block or reflect the optical detection signal with a preset central wavelength and pass the service optical signal, and the filter is embedded in the doped optical waveguide.

2. The visualization spectrometer according to claim 1, wherein: The filter includes a Bragg grating etched into the doped optical waveguide.

3. The visualization spectrometer according to claim 1, wherein: The filter is embedded in any position of the doped optical waveguide.

4. The visualization spectrometer according to any one of claims 1 to 3, wherein: The visualization spectrometer includes at least two branch ports, and each of the at least two branch ports corresponds to one of the doped optical waveguides and one of the filters.

5. The visualization spectrometer according to claim 4, wherein: In a case where the optical detection signal is an optical signal with adjustable wavelength, the filters with different central wavelengths corresponding to different branch ports are embedded in the same position in the doped optical waveguide.

6. The visualization spectrometer according to claim 4, wherein: When the optical detection signal has a single wavelength, the filters of the same central wavelength corresponding to different branch ports are embedded in different positions in the doped optical waveguide.

7. The visualization spectrometer according to claim 1, wherein: The doped optical waveguide includes an optical waveguide and a doping element doped in the optical waveguide; the optical waveguide includes an optical fiber or a planar waveguide.

8. An optical distribution network, comprising a visual optical splitter, wherein the visual optical splitter is the visual optical splitter according to any one of claims 1 to 7.

9. The optical distribution network according to claim 8, wherein: The optical distribution network further comprises a backbone optical fiber, a distribution optical fiber, a branch optical fiber and an N-level visual optical splitter, wherein N is a positive integer; The backbone optical fiber is connected to the input end of the first-level visualization spectrometer among the N-level visualization spectrometers, the branch optical fiber is connected to the output end of the N-level visualization spectrometer among the N-level visualization spectrometers, and the distribution optical fiber is connected to the output end of the n-1-th level visualization spectrometer among the N-level visualization spectrometers and the input end of the n-level visualization spectrometer, where n is a positive integer greater than 1 and less than or equal to N.

10. An optical distribution system comprising: a light detection signal module configured to generate a light detection signal; an optical line terminal configured to send out a service optical signal; an optical network terminal, configured to receive the service optical signal; An optical distribution network is configured to connect the optical line terminal, the optical detection signal module and the optical network terminal, wherein the optical distribution network adopts the optical distribution network according to any one of claims 8 to 9.

11. The optical distribution system according to claim 10, wherein: The optical detection signal includes a pump light signal and / or an optical time domain reflectometer (OTDR) signal with adjustable wavelength; The optical detection signal module includes: a pump light source configured to generate a pump light signal; and / or, The tunable wavelength OTDR transceiver unit is configured to send and receive OTDR signals with tunable wavelength.

12. The optical distribution system according to claim 11, wherein: The pump light source includes a pump light array and an optical switch module. The pump light array is configured to generate pump light, and the optical switch module is configured to control the on / off of the pump light in the pump light array.

13. The optical distribution system according to claim 10, further comprising a wavelength division multiplexer configured to couple the service optical signal and the optical detection signal into the same optical waveguide.

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