A multi-stage optical splitter, a multi-stage optical splitter identification system and method

Abstract

A kind of multistage optical splitter, multistage optical splitter identification system and method, multistage optical splitter includes first stage optical splitter, first optical fiber code, multiple second gratings, intermediate stage optical splitter, second optical fiber code, multiple fourth gratings, last stage optical splitter, third optical fiber code, multiple sixth gratings.Different wavelength identification pulse light waves are sent out by optical fiber code identification device, under the setting based on specific wavelength and distance, each optical fiber code or grating on the multistage optical splitter of the embodiment of the application will not affect each other and reflect different wavelength identification pulse light waves, and reflected light waves are sequentially transmitted back to optical fiber code identification device for analysis processing, to realize the branch identification of multistage optical splitter.Therefore, for the multistage optical splitter and its identification system of the embodiment of the application, the problem that current multistage optical splitter is difficult to realize each branch link identification is solved, and it is beneficial to be applied to PON network.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber communication, in particular to a multi-stage optical splitter, a multi-stage optical splitter identification system and method. BACKGROUND

[0002] Passive optical network (PON) technology is a point-to-multipoint optical fiber access technology, which is composed of an optical line terminal (OLT) device at the station side, an optical network unit (ONU) device at the user side, and an optical distribution network (ODN). Among them, ODN is entirely composed of splitters and other passive devices, without expensive active electronic devices.

[0003] In order to realize the identification of each device in the PON network, it is necessary to indirectly identify the splitter arranged in the middle of the network. For the case of a large number of devices, the splitter will adopt a multi-stage connection mode, and it is currently difficult to realize the identification of each branch link of the multi-stage splitter. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a multi-stage optical splitter, which solves the problem that it is currently difficult to realize the identification of each branch link of the multi-stage splitter.

[0005] The present application also provides a multi-stage optical splitter identification system and a multi-stage optical splitter identification method.

[0006] The multi-stage optical splitter according to the first aspect embodiment of the present application is applied to a PON network, and comprises:

[0007] A first-stage optical splitter has a first input end and a plurality of first output ends.

[0008] A first fiber code is arranged on the optical fiber at the first input end, and the first fiber code comprises a plurality of first gratings of different wavelengths.

[0009] A plurality of second gratings are arranged one by one on the optical fibers at the plurality of first output ends, and the wavelengths of the plurality of second gratings correspond to the wavelength segments of the first fiber code.

[0010] A middle-stage optical splitter has a second input end and a plurality of second output ends, and the second input end is connected to the target first output end.

[0011] A second fiber code is arranged on the fiber at the second input end, and the second fiber code comprises a plurality of third gratings with different wavelengths, and the wavelengths of the plurality of third gratings correspond to the wavelength segments of the second gratings of the target;

[0012] A plurality of fourth gratings are arranged on the fibers at the plurality of second output ends respectively one by one, and the wavelengths of the plurality of fourth gratings correspond to the wavelength segments of the second fiber code.

[0013] A final-stage optical splitter has a third input end and a plurality of third output ends, and the third input end is connected with the second output end of the target.

[0014] A third fiber code is arranged on the fiber at the third input end, and the third fiber code comprises a plurality of fifth gratings with different arrangement distances, and the wavelengths of the plurality of fifth gratings are the same and correspond to the wavelengths of the fourth gratings of the target.

[0015] A plurality of sixth gratings are arranged on the fibers at the plurality of third output ends respectively one by one, and the wavelengths of the plurality of sixth gratings correspond to the wavelength segments of the fourth gratings of the target.

[0016] The multi-stage optical splitter according to the embodiments of the present application has at least the following beneficial effects:

[0017] By arranging the first fiber code and the second gratings on the first-stage optical splitter, and making the wavelength segments of each second grating be a split of the wavelength segments of the first fiber code, and by arranging the second fiber code and the fourth gratings on the middle-stage optical splitter, and making the wavelength segments of each fourth grating be a split of the wavelength segments of the second fiber code, and the wavelength segments of the second fiber code be the wavelength segments of the corresponding connected second gratings, based on the arrangement mode, the wavelength segments of the first fiber code can be split in the multi-stage connection, so that the fiber codes and the gratings of each stage of the optical splitter can reflect the identification pulse light waves with different wavelengths without affecting each other, to realize the distinguishing identification of each branch. At the same time, by arranging the third fiber code and the sixth gratings on the final-stage optical splitter, and making the arrangement distances of each fifth grating be different, the principle of distinguishing identification by using different arrangement distances between the gratings is utilized to prevent the identification effect from being deteriorated after the wavelength segments are split for multiple times in the multi-stage transmission. Therefore, the multi-stage optical splitter according to the embodiments of the present application solves the problem that it is difficult to realize the identification of each branch link of the multi-stage optical splitter, and is beneficial to be applied to the PON network.

[0018] According to some embodiments of the present application, each sixth grating has a different arrangement distance.

[0019] According to some embodiments of the present application, the middle-stage optical splitters are provided in plurality, and the plurality of middle-stage optical splitters are connected to each other to form a middle-stage optical splitter network, an input end of the middle-stage optical splitter network is connected to the first output end, and an output end of the middle-stage optical splitter network is connected to the third input end.

[0020] According to the multi-stage optical splitter identification system of the second aspect of the embodiments of the present application, the multi-stage optical splitter identification system comprises:

[0021] An optical fiber code identification device is configured to identify the optical fiber code.

[0022] The multi-stage optical splitter according to any one of the first aspect of the embodiments of the present application is connected to an output end of the optical fiber code identification device.

[0023] According to the multi-stage optical splitter identification system of the embodiments of the present application, at least the following beneficial effects are achieved:

[0024] The optical fiber code identification device is configured to emit identification pulse light waves of different wavelengths. Under the setting based on the specific wavelength and distance, the optical fiber codes or gratings on the multi-stage optical splitter of the embodiments of the present application will reflect the identification pulse light waves of different wavelengths without affecting each other, and the reflected light waves are sequentially transmitted back to the optical fiber code identification device for analysis and processing, thereby realizing the identification of each branch of the multi-stage optical splitter. Therefore, the multi-stage optical splitter identification system of the embodiments of the present application solves the problem that it is difficult to identify each branch link of the multi-stage optical splitter, and is beneficial to be applied to the PON network.

[0025] According to some embodiments of the present application, the optical fiber code identification device comprises:

[0026] A plurality of pulse light sources are configured to output identification pulse light waves of different wavelengths, respectively.

[0027] A light source selection module is connected to the plurality of pulse light sources one by one at the plurality of input ends, respectively.

[0028] A circulator comprises a first port, a second port, and a third port. The first port is connected to the output end of the light source selection module, and the second port is connected to the first input end.

[0029] An optoelectronic processing module is connected to the third port at the input end.

[0030] A control module is electrically connected to the plurality of pulse light sources, the light source selection module, and the optoelectronic processing module, respectively.

[0031] According to some embodiments of the present application, the optoelectronic processing module comprises:

[0032] a photoelectric conversion unit, an input end of which is connected with the third port, the photoelectric conversion unit being used for converting optical signals into electrical signals;

[0033] an analog-digital conversion unit, an input end of which is electrically connected with an output end of the photoelectric conversion unit, and an output end of which is electrically connected with the control module.

[0034] According to some embodiments of the present application, the light source selection module adopts a SOA optical switch, a plurality of input ends of the SOA optical switch are respectively connected with output ends of a plurality of the pulse light sources one by one, an output end of the SOA optical switch is connected with the first port, and the SOA optical switch is electrically connected with the control module.

[0035] According to some embodiments of the present application, the light source selection module adopts a beam splitter, a plurality of input ends of the beam splitter are respectively connected with output ends of a plurality of the pulse light sources one by one, an output end of the beam splitter is connected with the first port, and the beam splitter is electrically connected with the control module.

[0036] According to some embodiments of the present application, the light source selection module adopts a wavelength division multiplexer, a plurality of input ends of the wavelength division multiplexer are respectively connected with output ends of a plurality of the pulse light sources one by one, an output end of the wavelength division multiplexer is connected with the first port, and the wavelength division multiplexer is electrically connected with the control module.

[0037] The multi-stage optical splitter identification method according to the third aspect of the embodiments of the present application is applied to the multi-stage optical splitter identification system according to any one of the second aspect of the embodiments of the present application, and includes the following steps:

[0038] The fiber coding identification device outputs an identification pulse light wave to the first input end;

[0039] The fiber coding identification device receives a plurality of reflected light waves reflected by the first fiber coding, the second grating, the second fiber coding, the fourth grating, the third fiber coding and the sixth grating respectively in sequence;

[0040] The fiber coding identification device performs analysis processing on the plurality of reflected light waves to realize identification of the branch links of the multi-stage optical splitter.

[0041] The multi-stage optical splitter identification method according to the embodiments of the present application has at least the following beneficial effects:

[0042] The multi-stage optical splitter identification method of the embodiment of the application is applied to the multi-stage optical splitter identification system of the embodiment of the application, different wavelength identification pulse light waves are emitted by the fiber code identification device, under the setting based on specific wavelengths and distances, each fiber code or grating on the multi-stage optical splitter will reflect different wavelength identification pulse light waves without affecting each other, and the reflected light waves are sequentially transmitted back to the fiber code identification device for analysis processing, thereby realizing the identification of each branch of the multi-stage optical splitter. Therefore, the multi-stage optical splitter identification method of the embodiment of the application solves the problem that it is difficult to identify each branch link of the multi-stage optical splitter at present, and is beneficial to be applied to the PON network.

[0043] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0045] Figure 1 is a structural schematic diagram of a multi-stage optical splitter of an embodiment of the application;

[0046] Figure 2 is a structural schematic diagram of a first-stage optical splitter of an embodiment of the application;

[0047] Figure 3 is a structural schematic diagram of a middle-stage optical splitter of an embodiment of the application;

[0048] Figure 4 is a structural schematic diagram of a last-stage optical splitter of an embodiment of the application;

[0049] Figure 5 is a spectral diagram of reflected light waves generated by fiber codes or gratings on each stage optical splitter of an embodiment of the application;

[0050] Figure 6 is a structural schematic diagram of a multi-stage optical splitter identification system of an embodiment of the application;

[0051] Figure 7 is a structural schematic diagram of a fiber code identification device of an embodiment of the application;

[0052] Figure 8 is a flowchart of a multi-stage optical splitter identification method of an embodiment of the application.

[0053] REFERENCE NUMERALS:

[0054] First-stage optical splitter 100; first fiber code 110; first grating 111; second grating 120;

[0055] Intermediate optical splitter 200; second fiber encoding 210; third grating 211; fourth grating 220;

[0056] Final optical splitter 300; third fiber encoding 310; fifth grating 311; sixth grating 320;

[0057] Fiber encoding identification device 400; pulse light source 410; light source selection module 420; circulator 430; control module 440; photoelectric conversion unit 451; analog-digital conversion unit 452. DETAILED DESCRIPTION

[0058] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0059] In the description of the present application, if the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0060] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, only for the purpose of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0061] In the description of the present application, it should be noted that, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0062] The technical solutions of the present application will be described below in detail in combination with the drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all embodiments.

[0063] It should be noted that the fiber coding is composed of multiple reflection and transmission marks, which can be distinguished by different wavelengths or different mark setting intervals when reflecting and transmitting light waves to realize the unique characteristics of the fiber coding under the light waves. Considering the cost, it is preferred to use marks with different setting intervals to compose the fiber coding. Specifically, the interval between adjacent marks is L0xK, where L0 is the reference interval and K is an integer. The reflection or transmission marks of the fiber coding can be sampled by a variety of different elements, mainly including fiber gratings (referred to as gratings), reflective films (sheets), transmission films (sheets), and silicon-based line grating. Since the wavelength width of the existing products of the reflective film (sheet) and the transmission film (sheet) is large, they are not suitable for the existing application scenarios; the silicon-based line grating can be directly engraved on the silicon substrate of the optical splitter, but the silicon substrate requires a small size, the interval between the silicon-based line grating and the optical splitter is very small, and the light source pulse and the collection space precision are required to be relatively high, and the cost is also very high; the fiber grating includes reflective fiber grating, transmission fiber grating, phase fiber grating, etc., which can be directly engraved on the optical fiber and directly connected with the optical fiber material product, and the cost is relatively low. Therefore, the fiber grating is preferably used as the fiber coding of the embodiments of the present application.

[0064] With reference to Figure 1As shown, the multi-stage optical splitter provided by the embodiment of the present application is applied to a PON network, and comprises a first-stage optical splitter 100, a first fiber coding 110, a plurality of second gratings 120, a middle-stage optical splitter 200, a second fiber coding 210, a plurality of fourth gratings 220, a last-stage optical splitter 300, a third fiber coding 310, and a plurality of sixth gratings 320. The first-stage optical splitter 100 has a first input end and a plurality of first output ends. The first fiber coding 110 is arranged on the optical fiber at the first input end, and the first fiber coding 110 comprises a plurality of first gratings 111 of different wavelengths. The plurality of second gratings 120 are arranged one by one on the optical fiber at the plurality of first output ends, and the wavelengths of the plurality of second gratings 120 correspond to the wavelength segments of the first fiber coding 110. The middle-stage optical splitter 200 has a second input end and a plurality of second output ends, and the second input end is connected to the first output end of the target. The second fiber coding 210 is arranged on the optical fiber at the second input end, and the second fiber coding 210 comprises a plurality of third gratings 211 of different wavelengths, and the wavelengths of the plurality of third gratings 211 correspond to the wavelength segments of the second gratings 120 of the target. The plurality of fourth gratings 220 are arranged one by one on the optical fiber at the plurality of second output ends, and the wavelengths of the plurality of fourth gratings 220 correspond to the wavelength segments of the second fiber coding 210. The last-stage optical splitter 300 has a third input end and a plurality of third output ends, and the third input end is connected to the second output end of the target. The third fiber coding 310 is arranged on the optical fiber at the third input end, and the third fiber coding 310 comprises a plurality of fifth gratings 311 of different setting distances, and the wavelengths of the plurality of fifth gratings 311 are the same and correspond to the wavelengths of the fourth gratings 220 of the target. The plurality of sixth gratings 320 are arranged one by one on the optical fiber at the plurality of third output ends, and the wavelengths of the plurality of sixth gratings 320 correspond to the wavelength segments of the fourth gratings 220 of the target.

[0065] Specifically, in combination with reference to FIGS. 1 to Figure 3 As shown, based on the actual application consideration, the number of stages of the multi-stage optical splitter cannot be too large, and therefore a three-stage optical splitter is taken as an example for illustration. Reference is made to FIG. 2. Figure 1 It can be understood that the three-stage optical splitter is connected in sequence and end to end, and the input end and the plurality of output ends of each stage of the optical splitter are respectively provided with fiber coding or gratings.

[0066] Continuing to refer to Figure 2 and Figure 3 The difference between the fiber coding or gratings on the first-stage optical splitter 100 and the middle-stage optical splitter 200 mainly lies in that the wavelengths are set differently. Specifically, the wavelength segments of the second fiber coding 210 on the middle-stage optical splitter 200 belong to the wavelength segments of the second gratings 120 on the first output end connected thereto, and the wavelength segments of the second gratings 120 are obtained by splitting the wavelength segments of the first fiber coding 110. Specifically, reference is made to FIG. 3. Figure 5It can be understood that, from the spectrum diagram of the reflected light waves generated by the fiber coding or the gratings on the spectrometers at each level, it can be seen that, except for the final spectrometer 300, for the spectrometers at other levels, the wavelength segments of the gratings on the multiple output ends are the split of the wavelength segments of the fiber coding on the input end, that is, the wavelength segments of the multiple gratings can be combined into the wavelength segments of the fiber coding, in addition, the wavelength segments of the fiber coding of the next level spectrometer are the wavelength segments of the gratings on the next level branch.

[0067] With continued reference to Figure 4 For the final spectrometer 300, the multiple fifth gratings 311 of the third fiber coding 310 are arranged at different intervals, the wavelength of each fifth grating 311 is the same and belongs to one of the wavelength segments of the fourth grating 220 on the second output end, the wavelengths of the multiple sixth gratings 320 are different from each other and are selected from the wavelength segments of the fourth grating 220 on the second output end respectively.

[0068] It can be understood that, based on the above arrangement of the multiple spectrometers, for the first spectrometer 100 and the intermediate spectrometer 200, the wavelengths of the fiber coding or the gratings are different, so that the identification can be distinguished; for the final spectrometer 300, the third fiber coding 310 uses gratings arranged at different intervals, and the sixth grating 320 uses different wavelengths, so that the identification can also be distinguished.

[0069] Further, in some embodiments, in view of the distance between the spectrometers at each level and the identification pulse light wave sending side, and the energy attenuation of the identification pulse light wave transmission, the reflectivity of the first fiber coding 110 is preferably 5%, the reflectivity of the second fiber coding 210 is preferably 5% x 115%, and the reflectivity of the third fiber coding 310 is preferably 60%; the reflectivity of the second grating 120 is preferably 40%, the reflectivity of the fourth grating 220 is preferably 40% x 120%, the reflectivity of the sixth grating 320 is preferably 100%, so as to realize smaller subsequent light wave shielding and overcome the problem of difficult identification after light wave attenuation.

[0070] In the embodiment, the first optical fiber code 110 and the second optical gratings 120 are arranged on the first-level optical splitter 100, and the wavelength range of each second optical grating 120 is split into the wavelength range of the first optical fiber code 110; the second optical fiber code 210 and the fourth optical gratings 220 are arranged on the middle-level optical splitter 200, and the wavelength range of each fourth optical grating 220 is split into the wavelength range of the second optical fiber code 210, and the wavelength range of the second optical fiber code 210 is the wavelength range of the corresponding connected second optical grating 120; based on the arrangement mode, the wavelength range of the first optical fiber code 110 can be split in the multi-level connection, so that the optical fiber code and the optical grating of each level of the optical splitter can reflect the identification pulse light waves of different wavelengths without affecting each other, to realize the distinguishing identification of each branch. Meanwhile, the third optical fiber code 310 and the sixth optical gratings 320 are arranged on the last-level optical splitter 300, and the arrangement distances of each fifth optical grating 311 are different, that is, the principle of distinguishing identification is realized by using the different arrangement distances between the optical gratings, to prevent the identification effect from being poor after the wavelength range is split for multiple times in the multi-level transmission. Therefore, the multi-level optical splitter of the embodiment solves the problem that the branch links of the multi-level optical splitter are difficult to be identified at present, and is beneficial to be applied to the PON network.

[0071] In some embodiments, as shown in Figure 4 Each sixth optical grating 320 has a different arrangement distance, respectively.

[0072] Specifically, referring to Figure 4 It can be understood that after the transmission through the multi-level optical splitter, the wavelength range may be split to the extent that it cannot be split further. Therefore, for the last-level optical splitter 300, the wavelengths of the multiple sixth optical gratings 320 can be the same as the wavelength of the third optical fiber code 310, but the arrangement distances of each sixth optical grating 320 are different, so the distinguishing identification of the sixth optical gratings 320 can still be realized.

[0073] In some embodiments, multiple middle-level optical splitters 200 are arranged, and the multiple middle-level optical splitters 200 are connected to form a middle-level optical splitter 200 network. The input end of the middle-level optical splitter 200 network is connected with the first output end, and the output end of the middle-level optical splitter 200 network is connected with the third input end.

[0074] Specifically, it can be understood that the number of levels of the multi-level optical splitter of the embodiment can be greater than three, that is, multiple middle-level optical splitters 200 can be arranged, and the multiple middle-level optical splitters 200 are connected in sequence and then connected with the first-level optical splitter 100 and the last-level optical splitter 300. It can be understood that in some embodiments, the multiple middle-level optical splitters 200 can also be connected to form a topological network, and multiple last-level optical splitters 300 are arranged and connected with the multiple second output ends of the multiple middle-level optical splitters 200 one by one.

[0075] In addition, referring toFigure 6 The embodiment of the present application also provides a multi-stage optical splitter identification system, comprising: a fiber code identification device 400 and the multi-stage optical splitter according to any one of the embodiment of the first aspect of the present application. The fiber code identification device 400 is used for identifying fiber codes; and the first input end of the multi-stage optical splitter is connected with the output end of the fiber code identification device 400.

[0076] Specifically, referring to Figure 6 A schematic diagram of the multi-stage optical splitter identification system according to an embodiment of the present application can be understood as follows: By using the fiber code identification device 400 to send out identification pulse light waves of different wavelengths, the identification pulse light waves are reflected by the first fiber code 110, the second grating 120, the second fiber code 210, the fourth grating 220, the third fiber code 310 and the sixth grating 320 in turn, and are transmitted back to the fiber code identification device 400 in turn to be analyzed, so that the input end and the output end of the first-stage optical splitter 100, the input end and the output end of the middle-stage optical splitter 200 and the input end and the output end of the last-stage optical splitter 300 are identified in turn, that is, the identification of each branch link of the multi-stage optical splitter is realized.

[0077] It can be understood that, by using the fiber code identification device 400 to send out identification pulse light waves of different wavelengths, under the setting based on specific wavelengths and distances, each fiber code or grating on the multi-stage optical splitter according to the embodiment of the present application will reflect the identification pulse light waves of different wavelengths without affecting each other, and the reflected light waves are transmitted back to the fiber code identification device 400 in turn to be analyzed, so that the identification of each branch of the multi-stage optical splitter is realized. Therefore, the multi-stage optical splitter identification system according to the embodiment of the present application solves the problem that it is difficult to identify each branch link of the multi-stage optical splitter, and is beneficial to be applied to a PON network.

[0078] In some embodiments, as Figure 7 shown, the fiber code identification device 400 comprises: a plurality of pulse light sources 410, a light source selection module 420, a circulator 430, an optoelectronic processing module and a control module 440. The plurality of pulse light sources 410 are used for outputting identification pulse light waves of different wavelengths respectively; the plurality of input ends of the light source selection module 420 are connected with the plurality of pulse light sources 410 one by one respectively; the circulator 430 comprises a first port, a second port and a third port, the first port is connected with the output end of the light source selection module 420, the second port is connected with the first input end; the input end of the optoelectronic processing module is connected with the third port; and the control module 440 is electrically connected with the plurality of pulse light sources 410, the light source selection module 420 and the optoelectronic processing module respectively.

[0079] Specifically, referring to Figure 7It can be understood that, under the operation of the control module 440, according to the wavelength of different fiber codes or gratings, the light source selection module 420 selects one pulsed light source 410 to send out an identification pulsed light wave of a specific wavelength, or selects multiple pulsed light sources 410 to simultaneously send out multiple identification pulsed light waves of different wavelengths, the identification pulsed light wave is transmitted to the circulator 430 and continues to be transmitted to each fiber code of the corresponding wavelength and is reflected, the multiple reflected light waves reflected back are received by the photoelectric processing module after passing through the circulator 430, the photoelectric processing module sequentially processes the multiple reflected light waves and outputs a digital signal to the control module 440, and the control module 440 analyzes the digital signal to complete the identification of each fiber code in the multi-stage optical splitter, thereby realizing the identification of each branch link of the multi-stage optical splitter.

[0080] In some embodiments, as shown in Figure 7 The photoelectric processing module includes a photoelectric conversion unit 451 and an analog-to-digital conversion unit 452. The input end of the photoelectric conversion unit 451 is connected with the third port, and the photoelectric conversion unit 451 is used for converting an optical signal into an electrical signal. The input end of the analog-to-digital conversion unit 452 is electrically connected with the output end of the photoelectric conversion unit 451, and the output end is electrically connected with the control module 440.

[0081] Specifically, referring to Figure 7 It can be understood that the photoelectric processing module can adopt the combination of the photoelectric conversion unit 451 and the analog-to-digital conversion unit 452. Specifically, the reflected light wave reflected back is processed by the photoelectric conversion unit 451 to convert the optical signal into an analog electrical signal, and then the analog electrical signal is further processed by the analog-to-digital conversion unit 452 to convert the analog electrical signal into a digital signal, and the digital signal is transmitted to the control module 440 for analysis. Specifically, the photoelectric conversion unit 451 can adopt a PIN photodiode to realize photoelectric conversion, or can adopt an avalanche photodiode (APD) to realize photoelectric conversion. The core processor of the control module 440 can adopt a single-chip microcomputer, a DSP or an ARM, and specifically can use an STM32 series processor.

[0082] In some embodiments, the light source selection module 420 adopts an SOA optical switch. The multiple input ends of the SOA optical switch are respectively and one-to-one connected with the output ends of the multiple pulsed light sources 410. The output end of the SOA optical switch is connected with the first port. The SOA optical switch is electrically connected with the control module 440.

[0083] Specifically, the SOA optical switch utilizes a semiconductor optical amplifier, and the switch function can be realized by changing the bias voltage of the SOA. When the bias is reduced, there is no population inversion, and thus the optical signal is absorbed. When the bias is increased, the input signal is amplified. Therefore, when the SOA is in the absorption and amplification state, the on-off extinction ratio is large, the switch is easy to integrate, the switch speed is fast, but the polarization is sensitive. In some embodiments, the SOA optical switch adopts an N*N type, that is, has a plurality of input ends and a plurality of output ends corresponding to the plurality of input ends. By setting the ports of the SOA optical switch, the connection of the plurality of pulsed light sources 410 can be realized, and the light waves of the corresponding wavelengths can be output.

[0084] In some embodiments, the light source selection module 420 adopts a beam splitter. The plurality of input ends of the beam splitter are connected to the output ends of the plurality of pulsed light sources 410 one by one. The output end of the beam splitter is connected to the first port. The beam splitter is electrically connected to the control module 440.

[0085] Specifically, the beam splitter can be in an M*N type, that is, has M input ends and N output ends. The light waves output by the plurality of pulsed light sources 410 can enter the beam splitter through the M input ends, and can be output through one of the N output ends, so as to realize the purpose of outputting the light waves of the required wavelengths.

[0086] In some embodiments, the light source selection module 420 adopts a wavelength division multiplexer. The plurality of input ends of the wavelength division multiplexer are connected to the output ends of the plurality of pulsed light sources 410 one by one. The output end of the wavelength division multiplexer is connected to the first port. The wavelength division multiplexer is electrically connected to the control module 440.

[0087] Specifically, the wavelength division multiplexer can combine two or more different wavelength optical carrier signals carrying various information together, and couple them into the same optical fiber of an optical line for transmission. When transmitted to the receiving end, the different wavelength optical signals are separated by a certain method. By using the wavelength division multiplexer, the connection of the plurality of pulsed light sources 410 can be realized, and the coupled light waves can be output. The receiving end can perform wavelength division multiplexing processing to obtain the light waves of the required wavelengths.

[0088] In addition, as shown in Figure 8 The embodiment of the present application also provides a multi-stage beam splitter identification method, which is applied to the multi-stage beam splitter identification system of any one of the embodiments of the present application, and includes the following steps:

[0089] The fiber coding identification device 400 outputs the identification pulsed light wave to the first input end;

[0090] The fiber coding identification device 400 receives the plurality of reflected light waves reflected by the first optical fiber coding 110, the second grating 120, the second optical fiber coding 210, the fourth grating 220, the third optical fiber coding 310, and the sixth grating 320 in sequence.

[0091] The optical fiber code recognition device 400 analyzes the multiple reflected light waves to realize the identification of the branch links of the multi-stage optical splitter.

[0092] Specifically, refer to Figure 8 the flowchart of the multi-stage optical splitter identification method of the embodiments of the present application. It should be noted that the multi-stage optical splitter identification system of the embodiments of the present application is used to realize the multi-stage optical splitter identification method described above, and the multi-stage optical splitter identification method of the embodiments of the present application corresponds to the multi-stage optical splitter identification system described above. The specific processing process is described with reference to the multi-stage optical splitter identification system described above, and will not be described here.

[0093] It can be understood that the multi-stage optical splitter identification method of the embodiments of the present application is applied to the multi-stage optical splitter identification system of the embodiments of the present application, and the optical fiber code recognition device 400 is used to emit identification pulse light waves of different wavelengths. Under the setting based on a specific wavelength and distance, the optical fiber codes or gratings on the multi-stage optical splitter will reflect the identification pulse light waves of different wavelengths without affecting each other, and the reflected light waves will be transmitted back to the optical fiber code recognition device 400 in turn for analysis, thereby realizing the identification of each branch of the multi-stage optical splitter. Therefore, the multi-stage optical splitter identification method of the embodiments of the present application solves the problem that it is difficult to identify each branch link of the multi-stage optical splitter, and is beneficial to be applied to the PON network.

[0094] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

[0096] As will be appreciated by one of ordinary skill in the art, all or some of the steps, systems, and techniques disclosed herein can be embodied in software, firmware, hardware, or any suitable combination thereof. 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 computer readable media, which can comprise computer storage media (or non-transitory media), and communication media (or transitory media). As will be appreciated by one of ordinary skill in the art, the term computer storage media includes all physical and tangible computer storage media, such as a 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 tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Further, as will be appreciated by one skilled in the art, communication media typically embodies 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 includes any information delivery media.

[0097] The embodiments of the present application disclosed above are only used to explain the principle of the present application, and the present application is not limited to the above embodiments. Various changes can be made by those skilled in the art without departing from the spirit of the present application.

Claims

1. A multi-stage optical splitter applied to a PON network, characterized in that, The application relates to a multi-stage optical splitter. The first-stage optical splitter comprises a first input end, a plurality of first output ends, a first fiber code arranged on an optical fiber at the first input end, and a plurality of first gratings of different wavelengths in the first fiber code. A plurality of second gratings are arranged on optical fibers at the plurality of first output ends respectively, and the wavelengths of the plurality of second gratings correspond to wavelength segments of the first fiber code. The middle-stage optical splitter comprises a second input end, a plurality of second output ends, and the second input end is connected with the first output end of the target. A second fiber code is arranged on an optical fiber at the second input end, the second fiber code comprises a plurality of third gratings of different wavelengths, and the wavelengths of the plurality of third gratings correspond to wavelength segments of the second gratings of the target. A plurality of fourth gratings are arranged on optical fibers at the plurality of second output ends respectively, and the wavelengths of the plurality of fourth gratings correspond to wavelength segments of the second fiber code. The last-stage optical splitter comprises a third input end, a plurality of third output ends, and the third input end is connected with the second output end of the target. A third fiber code is arranged on an optical fiber at the third input end, the third fiber code comprises a plurality of fifth gratings of different setting distances, the wavelengths of the plurality of fifth gratings are the same and correspond to the wavelengths of the fourth gratings of the target. A plurality of sixth gratings are arranged on optical fibers at the plurality of third output ends respectively, and the wavelengths of the plurality of sixth gratings correspond to wavelength segments of the fourth gratings of the target. Each of the sixth gratings has a different setting distance.

2. The multi-stage optical spectrometer of claim 1, wherein, The middle-stage optical splitter is provided with a plurality of middle-stage optical splitters which are connected with each other to form a middle-stage optical splitter network, the input end of the middle-stage optical splitter network is connected with the first output end, and the output end of the middle-stage optical splitter network is connected with the third input end.

3. The multi-stage optical spectrometer of claim 1, wherein, The application also relates to a fiber code identification device for identifying the fiber code.

4. A multi-stage optical splitter identification system, characterized by, The first input end of the multi-stage optical splitter is connected with the output end of the fiber code identification device. The fiber code identification device comprises a plurality of pulse light sources for outputting identification pulse light waves of different wavelengths respectively, a light source selection module, a circulator, an optoelectronic processing module, and a control module. The light source selection module is connected with the plurality of pulse light sources respectively.

5. The multi-stage optical splitter identification system of claim 4, wherein, The circulator comprises a first port, a second port, and a third port. The input end of the optoelectronic processing module is connected with the third port. The control module is electrically connected with the plurality of pulse light sources, the light source selection module, and the optoelectronic processing module respectively. The optoelectronic processing module comprises an optoelectronic conversion unit and an analog-digital conversion unit. The input end of the optoelectronic conversion unit is connected with the third port. The output end of the analog-digital conversion unit is electrically connected with the control module.

6. The multi-stage optical splitter identification system of claim 5, wherein, ​ ​ ​ 7. The multi-stage optical splitter identification system of claim 5, wherein, The light source selection module adopts a SOA optical switch, multiple input ends of the SOA optical switch are connected with the output ends of multiple pulse light sources one by one, an output end of the SOA optical switch is connected with the first port, and the SOA optical switch is electrically connected with the control module.

8. The multi-stage optical splitter identification system of claim 5, wherein, The light source selection module adopts a beam splitter, multiple input ends of the beam splitter are connected with the output ends of multiple pulse light sources one by one, an output end of the beam splitter is connected with the first port, and the beam splitter is electrically connected with the control module.

9. The multi-stage optical splitter identification system of claim 5, wherein, The light source selection module adopts a wavelength division multiplexer, multiple input ends of the wavelength division multiplexer are connected with the output ends of multiple pulse light sources one by one, an output end of the wavelength division multiplexer is connected with the first port, and the wavelength division multiplexer is electrically connected with the control module.

10. A multi-stage optical splitter identification method applied to the multi-stage optical splitter identification system according to any one of claims 4 to 9, characterized in that, The method comprises the following steps: The fiber encoding recognition device outputs an identification pulse light wave to the first input end; The fiber encoding recognition device receives multiple reflected light waves reflected by the first fiber encoding, the second grating, the second fiber encoding, the fourth grating, the third fiber encoding and the sixth grating in sequence; The fiber encoding recognition device analyzes the multiple reflected light waves to identify the branch links of the multi-stage beam splitter.

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