Visualized optical splitter, optical distribution network and optical distribution system

Abstract

The disclosed embodiments provide a visual optical splitter, an optical distribution network, and an optical distribution system. The visual optical splitter includes a doped optical waveguide for receiving an optical detection signal and adjusting the power of a service optical signal, and different doped optical waveguides change the power of the service optical signal by different amounts; a filter for selecting to pass, block, or reflect the optical detection signal of a preset central wavelength, and pass the service optical signal, and the filter is embedded in the doped optical waveguide and is an integrated structure with the doped optical waveguide. The structure of the visual optical splitter is simple, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a visualized optical splitter, an optical distribution network and an optical distribution system. Background Art

[0002] Passive optical network (PON) is a point-to-multipoint network that can provide higher bandwidth. It mainly consists of optical line terminal (OLT) at the central office, optical network unit (ONU) or optical network terminal (ONT) at the user end, and optical distribution network (ODN). Compared with the point-to-point topology, PON can reduce the cost of optical fiber, but the structure of PON is complex, which is not conducive to fault detection and topology visualization.

[0003] The ODN includes an optical splitter, which includes a filter and a power change component, wherein the filter is used to turn off or turn on optical signals of a certain wavelength, and the power change component is used to adjust the power of the service optical signal. In the ODN, the output port of each optical splitter corresponds to a different power change component, and the output port of the optical splitter can be determined by the power change of the service optical signal, thereby realizing fault detection and topology visualization. However, the filter and the power change component are both independent components, resulting in a complex structure of the optical splitter and great difficulty in assembly. Moreover, in order to realize the power adjustment of different service optical signals by the power change component, the performance of each power change component is different, so the preparation method of each power change component is different, which increases the preparation cost of the optical splitter. Summary of the invention

[0004] The present disclosure provides a visualized optical splitter, an optical distribution network and an optical distribution system, aiming to simplify the structure of the optical splitter and reduce the manufacturing cost.

[0005] In a first aspect, an embodiment of the present disclosure provides a visualization spectrometer, comprising:

[0006] A doped optical waveguide, used for receiving an optical detection signal and adjusting the power of a service optical signal, wherein different doped optical waveguides change the power of the service optical signal by different amounts;

[0007] The filter is used for selectively passing, blocking or reflecting the optical detection signal of a preset central wavelength and passing the service optical signal, and the filter is embedded in the doped optical waveguide.

[0008] In a second aspect, an embodiment of the present disclosure provides an optical distribution network, including a visualization optical splitter, wherein the visualization optical splitter adopts the visualization optical splitter described above.

[0009] In a third aspect, an embodiment of the present disclosure provides an optical distribution system, including:

[0010] A light detection signal module, used for generating a light detection signal;

[0011] Optical line terminal, used to send out business optical signals;

[0012] An optical network terminal, used for receiving the service optical signal;

[0013] An optical distribution network is used to connect the optical network terminal, the optical detection signal module and the optical network terminal, wherein the optical distribution network adopts the above-mentioned optical distribution network.

[0014] The visualization spectrometer provided by the present disclosure simplifies the structure of the visualization spectrometer because the filter is embedded in the doped optical waveguide and is an integrated structure with the doped optical waveguide. Moreover, it is only necessary to adjust the position of the filter in the doped optical waveguide without adjusting the structure of the doped optical waveguide, and the doped optical waveguide can be used to adjust the power of the service optical signal, thereby realizing the visualization of the spectrometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an architecture diagram of a passive optical network;

[0016] Figure 2 A schematic diagram of the structure of a visual spectrometer provided in an embodiment of the present disclosure;

[0017] Figure 3 A schematic diagram of the structure of another visual spectrometer provided in an embodiment of the present disclosure;

[0018] Figure 4 A schematic diagram of the structure of another visual spectrometer provided in an embodiment of the present disclosure;

[0019] Figure 5 A schematic diagram of the structure of another visual spectrometer provided in an embodiment of the present disclosure;

[0020] Figure 6 A schematic diagram of the structure of an optical distribution system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the optical splitter, optical distribution network and optical distribution system provided by the present disclosure are described in detail below with reference to the accompanying drawings.

[0022] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0023] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0024] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0027] In this disclosure, unless otherwise specified, the following technical terms should be understood as follows:

[0028] Wavelength Division Multiplexing (WDM) module refers to the technology of combining two or more optical signals of different wavelengths (carrying information) at the transmitting end through a multiplexer and coupling them into an optical waveguide for transmission; at the receiving end, the optical signals of different wavelengths are separated by a demultiplexer, and then further processed by an optical receiver to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing. Wavelength division multiplexers transmit optical signals based on wavelength division multiplexing technology.

[0029] An optical splitter is a connecting device with one or more input ports and multiple output ports. An optical splitter usually distributes the power to multiple split links in proportion to the power.

[0030] A filter is a wavelength-selective device that can select or filter out a desired wavelength from multiple wavelengths of optical signals.

[0031] Doped optical waveguide refers to an optical waveguide doped with a specific element, which absorbs input optical signals of different wavelengths according to the intrinsic parameters of the doped element. The doped element can be erbium ion, thulium ion, neodymium ion or erbium-ytterbium ion co-doped, etc., which is not limited in this application. It should be noted that the type of doped element, the content of the doped element, and the length of the doped optical waveguide all affect the absorption of the input optical signal.

[0032] Figure 1 Figure 1 is a diagram of the architecture of a passive optical network. Figure 1 As shown, the passive optical network (PON) includes an adjustable 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 used to generate an optical detection signal, the PON OLT 13 is used to generate a service optical signal, and the OTDR light 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 a splitter 6. The 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 splitter 6 in sequence.

[0033] In order to visualize the topological structure of the PON, the optical splitter 6 includes a filter 8 and a power change component. The filter 8 is used to turn off or turn on optical signals of a certain wavelength. The power change component is used to adjust the power of the service optical signal. The change in the power of the service optical signal is used to determine the correspondence between the branch port of the visualization optical splitter and the ONT14, thereby realizing the visualization of the PON topological structure.

[0034] In a first aspect, an embodiment of the present disclosure provides a visual spectrometer.

[0035] Figure 2 A schematic diagram of the structure of a visual spectrometer provided in an embodiment of the present disclosure. Figure 2 As shown, a visual spectrometer is provided, comprising:

[0036] The doped optical waveguide 7 is used to receive the optical detection signal and adjust the power of the service optical signal. Different doped optical waveguides 7 change the power of the service optical signal by different amounts.

[0037] The filter 8 is used to select, pass, block or reflect the optical detection signal of the preset center wavelength, that is, the filter 8 can select the optical detection signal of the preset center wavelength. Each filter 8 can select to pass, block or reflect the optical detection signal of a specific center wavelength. For example, the filter passes the optical detection signal of the first center wavelength and blocks the optical detection signals of other center wavelengths; for another example, the filter blocks the optical detection signal of the second center wavelength and passes the optical detection signals of other center wavelengths. While selecting to pass, block or reflect the optical detection signal of the preset center wavelength, the filter 8 can pass the business optical signal, that is, the business optical signal is not affected by the filter 8.

[0038] 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 an integral structure 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 together, so that the filter 8 and the doped optical waveguide 7 are an integral structure.

[0039] In some embodiments, the filter 8 comprises a Bragg grating etched into the doped optical waveguide 7 .

[0040] 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.

[0041] When manufacturing the visual spectrometer, the doped optical waveguide 7 is first manufactured, and then a Bragg grating is etched out of the doped optical waveguide 7 by an etching process, so that the Bragg grating and the doped optical waveguide 7 are manufactured at one time.

[0042] In some embodiments, the filter 8 is embedded in any position of the doped optical waveguide 7, such as the filter 8 is embedded in the front section, middle section or tail section of the doped optical waveguide 7. The front section refers to the doped optical waveguide 7 close to the light incident side, such as the light incident side of the doped optical waveguide 7 to one third of the starting position of the light incident side. Figure 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 starting from the light incident side. Figure 3 The tail section refers to the doped optical waveguide 7 close to the light-emitting side, such as from two-thirds of the starting position of the incident light to the light-emitting side of the doped optical waveguide 7, such as Figure 4 shown.

[0043] In some embodiments, the visualization spectrometer includes a common port and at least two branch ports, each of the at least two branch ports corresponds to a doped optical waveguide 7 and a filter 8, and the filter corresponding to each branch port is located at the same position or different positions of the doped optical waveguide. For example, all filters 8 are located at the front section of the doped optical waveguide 7, such as Figures 2 to 4 Alternatively, different filters 8 are located at different positions of the doped optical waveguide 7, such as Figure 5 shown.

[0044] In the embodiment of the present disclosure, the structures of the doped optical waveguides 7 corresponding to different branch ports are the same, which simplifies the structure of the visualization spectrometer and reduces the manufacturing cost of the doped optical waveguide 7, thereby reducing the manufacturing cost of the visualization spectrometer; and different filters 8 can be processed at one time through an etching process, reducing the manufacturing cost of the filters 8.

[0045] like Figure 2 As shown, the visualization spectrometer includes a common port 9 and at least two branch ports 10 . Each of the at least two branch ports 10 corresponds to a doped optical waveguide 7 and a filter 8 . The filter 8 is embedded in the doped optical waveguide 7 .

[0046] In some embodiments, when the optical detection signal has an adjustable wavelength, filters with different center wavelengths corresponding to different branch ports 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 center wavelengths of the optical detection signals allowed to pass through the filters are different, the optical detection signals with different center wavelengths have different effects on the power change of the service optical signal (different branch ports). Therefore, the power gain or attenuation of the service optical signal received by the optical network terminal is different. The center wavelength of the optical detection signal can be determined by the power gain or attenuation of the service optical signal, the filter can be determined based on the center wavelength of the optical detection signal, and the branch port connected to the optical network terminal can be determined based on the filter.

[0047] like Figure 2 As shown, the visualized optical splitter includes a common port 9 and eight branch ports 10. The common port 9 is used to receive optical signals. At least some of the branch ports 10 are each connected to an ONT. A doped optical waveguide 7 and a filter 8 are arranged between the branch port 10 and the ONT. All filters 8 are embedded in the front section of the doped optical waveguide 7 and have 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.

[0048] Among them, the doped optical waveguides 7 have the same length, the same doping element, and the same doping concentration; the same length, different doping elements, and the same doping concentration; or the doped optical waveguides 7 have the same length, the same doping element, and different doping concentrations; or the doped optical waveguides 7 have the same length, different doping elements, and different doping concentrations. In this way, different doped optical waveguides 7 have different changes in the power of the service optical signal, so that the change in the power of the service optical signal corresponds to the branch port 10. Different filters 8 have the same structure, but different filters 8 have different choices for the wavelength of the detection optical signal.

[0049] For example, Figure 3 As shown, the visualized optical splitter includes a common port 9 and eight branch ports 10. The common port 9 is used to receive optical signals. Each branch port 10 is connected to an ONT signal. A doped optical waveguide 7 and a filter 8 are arranged between the branch port 10 and the ONT. All filters 8 are embedded in the front section of the doped optical waveguide 7 and have 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. Figure 3 The visualized spectrometer shown is Figure 2 Compared with the visualized spectrometer shown, the structure of the doped optical waveguide 7 and the filter 8 is similar to Figure 2 The same as shown, no further description is given here.

[0050] In some embodiments, when the optical detection signal is a single wavelength, the filters of the same central wavelength corresponding to different branch ports have different embedded positions in the doped optical waveguide, that is, the central wavelength of the filter set at each branch port is the same. The central wavelength of the filter refers to the central wavelength of the optical detection signal selected by the filter. If the central wavelength of the optical detection signal allowed to pass through the filter is the wavelength of the first band, then the central wavelength of the filter is the wavelength of the first band. For another example, if the central wavelength of the optical detection signal reflected by the filter is the wavelength of the second band, then the central wavelength of the filter is the wavelength of the second band. In some embodiments, the optical detection signal of a single wavelength can be a fixed wavelength PUMP light.

[0051] like Figure 5 As shown, the visualized optical splitter includes a common port 9 and eight branch ports 10. The common port 9 is used to receive optical signals. 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 embedded at a different position in 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 incident surface of the filter 8) is different, so that each doped optical waveguide 7 has a different change in the power of the service optical signal, thereby making the branch port 10 correspond to the change in the power of the service optical signal one by one.

[0052] The visualization spectrometer provided by the present disclosure simplifies the structure of the visualization spectrometer because the filter is embedded in the doped optical waveguide and is an integrated structure with the doped optical waveguide. Moreover, the position of the filter in the doped optical waveguide can be adjusted without adjusting the structure of the doped optical waveguide, and the doped optical waveguide can be used to adjust the power of the service optical signal, thereby realizing the visualization of the spectrometer.

[0053] In a second aspect, an embodiment of the present disclosure provides an optical distribution network, which can be applied to an optical distribution system. For ease of description, the optical distribution network is introduced below by taking an optical distribution system as an example.

[0054] Figure 6 FIG. 1 is a schematic diagram of a structure of an optical distribution system provided by an embodiment of the present disclosure. Figure 6 As shown, the optical distribution system includes an optical detection signal module, a PON OLT13, an optical network terminal ONT14 and an optical distribution network ODN15, wherein the optical detection signal module is used to generate an optical detection signal, the PON OLT13 is used to send a service optical signal, the ONT14 is used to receive a service optical signal, and the ODN15 is used to realize the optical signal connection between the optical detection signal module, the PON OLT13 and the ONT14.

[0055] In some embodiments, the optical detection signal includes a pump light signal and / or an optical time domain reflectometer OTDR signal with adjustable wavelength. When the optical detection signal is a pump light signal, the optical detection signal module includes a pump light source 11, and the pump light source 11 is used to emit the pump light signal. When the optical detection signal is an OTDR signal with adjustable wavelength, the optical detection signal module includes an adjustable wavelength OTDR transceiver unit 12, and the adjustable wavelength OTDR transceiver unit 12 is used to emit and receive the OTDR signal with adjustable wavelength.

[0056] In the embodiment of the present disclosure, the ODN 15 includes a visualization spectrometer 16. The visualization spectrometer 16 adopts the visualization spectrometer provided by the embodiment of the present disclosure. The structure of the visualization spectrometer is similar to the visualization spectrometer shown in the above embodiment, which will not be described in detail here.

[0057] In some embodiments, the optical distribution network further includes a backbone optical fiber, a distribution optical fiber, a branch optical fiber and N-level visualization splitters, wherein N is a positive integer; the backbone optical fiber is connected to the input end of the 1st-level visualization splitter among the N-level visualization splitters, the branch optical fiber is connected to the output end of the N-th-level visualization splitter among the N-level visualization splitters, the distribution optical fiber connects the output end of the n-1th-level visualization splitter among the N-level visualization splitters to the input end of the n-level visualization splitter, and n is a positive integer greater than 1 and less than or equal to N.

[0058] For example, Figure 6As shown, the optical distribution network includes two levels of visual splitters, namely, a first-level visual splitter and a second-level visual splitter, and the first-level visual splitter and the second-level visual splitter each include eight branch ports. Among them, the common port of the first-level visual splitter to the doped optical waveguide 7 of the first-level visual splitter is a backbone optical fiber, that is, the backbone optical fiber is connected to the input end of the first-level visual splitter in the N-level visual splitter. The doped optical waveguide 7 of the first-level visual splitter to the doped optical waveguide 7 of the second-level visual splitter is a distribution optical fiber, that is, the distribution optical fiber connects the doped optical waveguide 7 of the first-level visual splitter to the input end of the second-level visual splitter. The branch optical fiber is connected to the output end of the Nth-level visual splitter in the N-level visual splitter, that is, the doped optical waveguide 7 of the second-level visual splitter to ONT14 is a branch optical fiber.

[0059] When the optical distribution network includes only one level of 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 realize signal connection with ONT14 through the branch optical fiber.

[0060] The optical distribution network provided by the embodiment of the present disclosure adopts the visualized splitter provided by the embodiment of the present disclosure. Since the filter is embedded in the doped optical waveguide and is an integrated structure with the doped optical waveguide, the structure of the visualized splitter is simplified, thereby simplifying the structure of the optical distribution network; 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, thereby realizing the visualization of the optical distribution network.

[0061] In a third aspect, an embodiment of the present disclosure provides an optical distribution system.

[0062] like Figure 6As shown, the optical distribution system includes an optical detection signal module, a PON optical line terminal OLT13, an optical network terminal ONT14 and an optical distribution network ODN15, wherein the optical detection signal module is used to generate an optical detection signal, the PON OLT13 is used to send a service optical signal, the ONT14 is used to receive a service optical signal, and the ODN15 is used to connect the optical detection signal module, the PON OLT13 and the ONT14, that is, the ODN15 is used to realize the interconnection between the optical detection signal module, the PON OLT13 and the ONT14. ONT14 receives a Gigabit Passive Optical Network (G-PON) service signal and sends a G-PON service signal, or receives a 10 Gigabit Passive Optical Network (10G Gigabit Passive Optical Network, XG-PON) XG-PON service signal and sends an XG-PON service signal. ODN15 adopts the optical distribution network provided by the above embodiment.

[0063] 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 used to send a pump light signal, and the adjustable wavelength OTDR transceiver unit 12 is used to send and receive an adjustable wavelength OTDR signal. Both the pump light signal and the adjustable wavelength OTDR signal can be used as an optical detection signal.

[0064] In some embodiments, the pump light source 11 includes a pump light array and an optical switch module. The pump light array is used to generate a pump light signal, and the optical switch module is used to control the switching of each pump light in the pump light array.

[0065] In some embodiments, the optical distribution system further includes a wavelength division multiplexer 17, which is used to couple the service optical signal and the optical detection signal into the same optical waveguide. This embodiment does not limit the structure and model of the wavelength division multiplexer 17.

[0066] The optical distribution system provided by the embodiment of the present disclosure adopts the visualization splitter provided by the embodiment of the present disclosure in the optical distribution network, and the filter is embedded in the doped optical waveguide and is an integrated structure with the doped optical waveguide, which simplifies the structure of the visualization splitter, thereby simplifying 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, thereby realizing the visualization of the optical distribution system.

[0067] The embodiments of the present disclosure provide an optical distribution system that can perform port identification. Different visualization optical splitters use slightly different identification methods. The port identification methods of optical distribution systems using different visualization optical splitters are introduced below.

[0068] When the wavelength of the optical detection signal is fixed, 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, such as Figure 5 As shown, the power of the downstream service optical signal is adjusted, and the branch port is identified based on the change in the power of the downstream service optical signal, thereby realizing the visualization of the optical distribution system.

[0069] By way of example, when the wavelength of the optical detection signal is a fixed wavelength, the port identification method of the optical distribution system includes:

[0070] Step S701: An ONT receives a service optical signal and determines a first power of the service optical signal.

[0071] The first power of the service optical signal is the power of the service optical signal actually received by the ONT in the absence of an optical detection signal. The embodiment of the present disclosure does not limit the ONT to determine the first power of the service optical signal according to the service optical signal.

[0072] Step S702: The ONT obtains the service optical signal after the power of the doped optical waveguide is adjusted, and determines a second power based on the service optical signal after the power of the doped optical waveguide is adjusted.

[0073] Step S703: The ONT determines a first power variation of the service optical signal based on the first power and the second power.

[0074] The ONT calculates the difference between the first power and the second power to obtain a first power variation of the service optical signal.

[0075] 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 preset; 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.

[0076] Step S705: determining the topology of the ONT based on the connection relationship between the ONT and the branch port of the optical splitter.

[0077] By changing the position of the filter, the length of the doped optical waveguide is adjusted, and there is no need to connect doped optical waveguides of different lengths 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 change amount of the service optical signal in the gain spectrum received by the ONT or ONU is different. The corresponding doped optical waveguide can be determined by the power change amount of different service optical signals received by different ONTs or ONUs, and the corresponding branch port can be determined by the doped optical waveguide, thereby determining the corresponding relationship between the ONT or ONU and the branch port.

[0078] When the wavelength of the optical detection signal is an OTDR signal with adjustable wavelength, the filters corresponding to different branch ports can select the central wavelength of the optical detection signal, and the filters corresponding to different branch ports can be set at the same position of the doped optical waveguide, such as Figure 2 As shown. The optical detection signal with the same center wavelength as the filter wavelength can hardly pass through, but the service optical signal is almost unaffected. As the wavelength of the filter is different from the center wavelength of the optical detection signal, the optical detection signal can pass through other branch ports. 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. The filter corresponding to the ONT or ONU can be determined according to the power change value, and the corresponding branch port can be determined by the filter, so that the ONT can identify the branch port of the visualization splitter.

[0079] By way of example, when the wavelength of the optical detection signal is an OTDR signal with an adjustable wavelength, the port identification method of the optical distribution system includes:

[0080] Step S801, the ONT receives a service optical signal from an optical line terminal, and determines a third power of the service optical signal;

[0081] Step S802, the ONT obtains the service optical signal after the power of the doped optical waveguide is adjusted, and determines a fourth power based on the service optical signal after the power is adjusted;

[0082] Step S803, the ONT determines a second power variation of the service optical signal based on the third power and the fourth power;

[0083] Step S804, the ONT determines the correspondence between the ONT and the branch port of the optical splitter according to the second power variation of the service optical signal and the correspondence between the central wavelength of the adjustable wavelength saturated absorption mode signal and the filter of the branch port of the optical splitter;

[0084] Step S805: determining the topology of the ONT based on the correspondence between the ONT and the branch port of the optical splitter.

[0085] When the wavelength of the optical detection signal is a pump light signal with an adjustable wavelength, visualization can also be achieved by adjusting the transmittance of the filter.

[0086] For example, Figure 3 As shown, different transmittance r 1-8 The single wavelength filter is etched in the middle section of the doped optical waveguide. Since the transmittance of the filter at the branch port i is r i The filter makes the pump light signal have a certain ratio r i After passing through the filter, the doped optical waveguide behind the filter (on the right side of the filter in the figure) amplifies the power of the service optical signal. The total power gain is the sum of the doped optical waveguide gain in the front and the doped optical waveguide gain in the back. The transmittance of the filter corresponding to different branch ports is different. Therefore, the power gain value of the service optical signal corresponding to each branch port is different. The ONU can identify the connected branch port through different gain values.

[0087] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are 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 the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0088] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A visual spectrometer, comprising: A doped optical waveguide, used for receiving an optical detection signal and adjusting the power of a service optical signal, wherein different doped optical waveguides change the power of the service optical signal by different amounts; A filter, used for selectively passing, blocking or reflecting the optical detection signal of a preset central wavelength and passing the service optical signal, wherein the filter is embedded in the doped optical waveguide and comprises a Bragg grating etched on the doped optical waveguide; When the optical detection signal has a single wavelength, the filters of the same central wavelength corresponding to different branch ports are embedded at different positions in the doped optical waveguide.

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

3. The visualization spectrometer according to any one of claims 1 to 2, wherein: At least two branch ports are included, and each of the at least two branch ports corresponds to one of the doped optical waveguides and one of the filters.

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

5. An optical distribution network, comprising a visualization optical splitter, wherein the visualization optical splitter is the visualization optical splitter according to any one of claims 1 to 4.

6. The optical distribution network according to claim 5, wherein: The optical distribution network also includes 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 connects 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.

7. An optical distribution system, comprising: A light detection signal module, used for generating a light detection signal; Optical line terminal, used to send out business optical signals; An optical network terminal, used for receiving the service optical signal; An optical distribution network is used to connect the optical network terminal, the optical detection signal module and the optical network terminal, wherein the optical distribution network adopts the optical distribution network as claimed in any one of claims 5 to 6.

8. The optical distribution system according to claim 7, 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 comprises: a pump light source, for generating a pump light signal; and / or, The tunable wavelength OTDR transceiver unit is used to send and receive tunable wavelength OTDR signals.

9. The optical distribution system according to claim 8, wherein: The pump light source comprises a pump light array and an optical switch module. The pump light array is used to generate pump light, and the optical switch module is used to control the switching of the pump light in the pump light array.

10. The optical distribution system according to claim 7, wherein: It also includes a wavelength division multiplexer, which is used to couple the service optical signal and the optical detection signal into the same optical waveguide.

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