Optical distribution network, optical distribution system and optical power disturbance method

Abstract

Provided in the present disclosure are an optical distribution network, an optical distribution system and an optical power disturbance method. The optical distribution network comprises a doped optical waveguide, wherein an optical detection signal changes, in the doped optical waveguide, an absorption coefficient of a service optical signal, so as to adjust the power of the service optical signal; and the wavelength of the optical detection signal is different from the wavelength of the service optical signal.

Description

Optical distribution network, optical distribution system and optical power disturbance method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410068392.9 filed on January 17, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to the field of communication technology, and in particular to an optical distribution network, an optical distribution system, and an optical power disturbance method. Background Art

[0004] A passive optical network (PON) is a point-to-multipoint network that provides higher bandwidth. It primarily consists of an optical line terminal (OLT) at the central office, an optical network unit (ONU) or optical network termination (ONT) at the user end, and an optical distribution network (ODN). Compared to a point-to-point topology, a PON can reduce fiber costs. However, its complex structure hinders fault detection and topology visualization.

[0005] To facilitate topology visualization and fault detection, relevant technicians have improved PON by installing a power variation component at the output port of each optical splitter. Different output ports correspond to different power variation components, and different power variation components have different effects on the power change of the service optical signal. Therefore, the output port of the optical splitter can be determined based on the correspondence between the power change of the service optical signal and the output port, thereby achieving topology visualization and fault detection. However, in order to achieve the power adjustment of the service optical signal by the power variation component, pump (PUMP) light is required. In addition, the structure of the ODN is complex, resulting in a complex PON structure and high manufacturing cost.

[0006] Public content

[0007] In a first aspect, the present disclosure provides an optical distribution network, comprising a doped optical waveguide, wherein an optical detection signal changes the absorption coefficient of a service optical signal in the doped optical waveguide to adjust the power of the service optical signal; the wavelength of the optical detection signal is different from the wavelength of the service optical signal.

[0008] In a second aspect, the present disclosure provides an optical distribution system, comprising an optical detection signal transceiver module, an optical line terminal (OLT) optical transceiver module, an optical network terminal, and an optical distribution network as provided in the first aspect of the present disclosure, wherein the optical distribution network is configured to perform signal connection between the optical detection signal transceiver module and the optical network terminal, and to perform signal connection between the OLT optical transceiver module and the optical network terminal.

[0009] In a third aspect, the present disclosure provides an optical power disturbance method, which uses the optical distribution system provided in the second aspect of the present disclosure to execute steps, including: using an optical detection signal to adjust the power of the service optical signal in the doped optical waveguide; the optical detection signal adjusts the power of the service optical signal by changing the absorption coefficient of the service optical signal in the doped optical waveguide. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a passive optical network architecture provided by the present disclosure;

[0011] FIG2 is a schematic diagram showing the principle of the stimulation of PUMP light and service optical signals during transmission in a doped optical waveguide;

[0012] FIG3 is a diagram showing the working principle of the doped optical waveguide in the present disclosure;

[0013] FIG4 is a schematic structural diagram of an optical distribution network provided by the present disclosure;

[0014] FIG5 shows an absorption spectrum of an erbium-doped optical waveguide for a single wavelength;

[0015] FIG6 shows an absorption spectrum of an erbium-doped optical waveguide at two wavelengths;

[0016] FIG7 shows an absorption spectrum of an erbium-doped optical waveguide for three wavelengths;

[0017] FIG8 is a block diagram of a wavelength-adjustable dual-mode optical transmission module provided by the present disclosure;

[0018] FIG9 is a block diagram of a wavelength-adjustable dual-mode optical transmission module provided by the present disclosure;

[0019] FIG10 is a transmission spectrum diagram of a band-stop or narrow-band reflective filter blocking or attenuating an optical signal;

[0020] FIG11 is a perspective spectrum diagram of a service optical signal and an optical detection signal passing through a bandpass filter in the present disclosure;

[0021] FIG12 is a block diagram of an electronic device provided by the present disclosure. DETAILED DESCRIPTION

[0022] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the optical distribution network, optical distribution system, and optical power disturbance method provided by the present disclosure are described in detail below with reference to the accompanying drawings.

[0023] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings, but the example embodiments may be embodied in different forms, and the present disclosure should not be construed as limited to the embodiments set forth herein. These embodiments are provided to make the present disclosure more thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0024] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0025] As used herein, the term "and / or" includes any and all combinations of at least one of the associated listed items.

[0026] The terms used herein are used only 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, they specify the presence of specific features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or possible addition of one or more other features, wholes, steps, operations, elements, components, and / or groups thereof.

[0027] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled 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 expressly defined as such herein.

[0028] In this disclosure, unless otherwise specified, the following technical terms should be understood as follows:

[0029] The light source is used to generate service optical signals and optical detection signals.

[0030] A wavelength division multiplexing (WDM) module combines two or more optical signals (carrying information) of different wavelengths at the transmitting end through a multiplexer and couples them into an optical waveguide for transmission. At the receiving end, a demultiplexer separates the optical signals of different wavelengths, and an optical receiver further processes them to restore the original signals. 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.

[0031] An optical splitter is a connecting device with at least one input port and multiple output ports. The optical splitter usually distributes the power to multiple split links in proportion to the power.

[0032] A filter is a wavelength-selective device that can select or filter out the desired wavelength from multiple wavelengths of optical signals.

[0033] A doped optical waveguide is an optical waveguide doped with a specific element. Based on the intrinsic parameters of the doping element, it absorbs input optical signals of different wavelengths. The doping element can be erbium ions, thulium ions, neodymium ions, or a co-doping of erbium and ytterbium ions, though this application does not limit this. It should be noted that the type of doping element, the doping element content, and the length of the doped optical waveguide all affect the absorption of the input optical signal.

[0034] Figure 1 is an architectural diagram of a passive optical network. As shown in Figure 1, the passive optical network includes PUMP light 1, OLT 2, ODN 3, and ONT 4. PUMP light 1 generates optical detection signals, and OLT 2 generates service optical signals. PUMP light 1 and OLT 2 are connected to ONT 4 via ODN 3. ODN 3 includes a wavelength division multiplexing module 31, an optical splitter 32, and a filter 33. The optical detection signal generated by PUMP light 1 passes through the wavelength division multiplexing module 31, optical splitter 32, and filter 33 in sequence before being transmitted to the corresponding ONT 4.

[0035] In order to visualize the PON topology, a filter 33 and a doped optical waveguide 34 can be set at the output port of the splitter 32. By using the correspondence between the center wavelength of the filter and the output port of the splitter 32, and the correspondence between the doped optical waveguide and the power change of the service optical signal, the correspondence between the power change of the service optical signal and the output port of the splitter 32 can be obtained, thereby realizing the visualization of the PON topology.

[0036] In the related art, the PUMP light 1 of the visualized PON topology converts the power of the PUMP light into the power of the signal light. The doped ions in the doped optical waveguide have three energy levels, namely E1 energy level, E2 energy level and E3 energy level. The E1 energy level represents the ground state with the lowest power, the E2 energy level represents the metastable state with intermediate power, and the E3 energy level represents the activated state with the highest power. When the photon power of the detection light is equal to the power difference between E3 and E1, the doped ions absorb the power of the detection light and transition from the ground state to the excited state, that is, the ions at the E1 energy level transition to the E3 energy level. Since the excited state is unstable, the ions will transition to the E2 energy level or the E1 energy level. This process will amplify the service optical signal and generate spontaneous radiation light.

[0037] Figure 2 is a schematic diagram of the principle of the stimulation of PUMP light and service optical signals during transmission in a doped optical waveguide. As shown in Figure 2, the doping elements in the doped optical waveguide transition from the ground state to the excited state under the radiation of PUMP light with a wavelength of 980nm; and transition from the ground state to the metastable state under the radiation of PUMP light with a wavelength of 1480nm. The doping elements in the excited state are unstable and easily transition from the excited state to the metastable state. The doping elements in the metastable state are also unstable and easily transition from the metastable state to the ground state. In the process of transitioning from the metastable state to the ground state, spontaneous radiation light with a wavelength of 1500nm is generated, and at the same time, the service optical signal with a wavelength of 1600nm is stimulated and amplified, that is, part of the power of the PUMP light is converted into the service optical signal, and part of the power is converted into spontaneous radiation light.

[0038] This method of amplifying service optical signals requires pump light, which is an array of light and requires the use of optical switches. Consequently, the PON structure is complex. Furthermore, to achieve the desired perturbation effect, each output port of the optical splitter 32 is equipped with multiple doped optical waveguides, increasing the complexity of the PON structure and the manufacturing cost.

[0039] To address this technical issue, the present disclosure provides an optical distribution network, an optical distribution system, and an optical power perturbation method, which adjust the power of service optical signals through doped optical waveguides. However, the working principle of doped optical waveguides is different from that of PUMP light. Therefore, PUMP light is not required, and the structure is simpler, thereby reducing the cost of PON.

[0040] To facilitate understanding of the optical distribution network, optical distribution system, and optical power perturbation method provided by the present disclosure, the working principle of the doped optical waveguide in the present disclosure is introduced below.

[0041] FIG3 is a diagram showing the working principle of the doped optical waveguide in the present disclosure. As shown in FIG3 , when the wavelength of the optical signal is within the absorption spectrum of the doped optical waveguide, the doping elements in the doped optical waveguide include a ground state and a metastable state. When the doping elements absorb the power in the optical signal, they transition from the ground state to the metastable state. When the doping elements in the metastable state transition to the ground state, the power in the absorbed optical signal is converted into amplified spontaneous emission (ASE) noise, and the power of the optical signal is changed. The optical power attenuation (dB) of a doped optical fiber per unit length (m) that absorbs a certain wavelength optical signal and converts it into ASE noise is the absorption coefficient of the optical signal at that wavelength. More importantly, the magnitude of the ASE noise converted from optical signals of different wavelengths is different, that is, the absorption coefficient of the optical signal is related to the characteristics of the doped optical waveguide. The present disclosure proposes a solution that utilizes this characteristic of the optical signal in the doped optical waveguide.

[0042] When only service optical signals are transmitted in a doped optical waveguide, due to the absorption effect of the doped optical waveguide (also known as the power absorption effect), part of the power of the service optical signal that falls within the absorption spectrum of the doped optical waveguide is absorbed by the doped optical waveguide and converted into ASE noise, causing attenuation of the service optical signal.

[0043] When a service optical signal and an optical detection signal are transmitted in a doped optical waveguide, the wavelength of the optical detection signal differs from that of the service optical signal, creating a new absorption effect on both signals. Part of the optical detection signal's power within the absorption spectrum is converted into ASE noise, reducing the power of the service optical signal converted into ASE noise. This, in turn, reduces the absorption coefficient of the service optical signal. Consequently, the power of the service optical signal within the absorption spectrum converted into ASE noise is reduced, thereby reducing the attenuation effect of the service optical signal. This, in turn, reduces the insertion loss of the doped optical waveguide for the service optical signal, indirectly enhancing the service optical signal received by the ONT.

[0044] In the present disclosure, because the wavelength of the optical detection signal differs from that of the service optical signal, the different wavelengths of the optical signals result in different insertion losses for the optical detection signal in the doped optical waveguide. Furthermore, as the optical detection signal's intensity increases, the power converted from the optical detection signal to ASE noise increases, weakening the attenuation effect on the service optical signal. When the wavelength of the optical detection signal falls within the absorption peak band of the doped optical waveguide, the power converted from the optical detection signal to ASE noise further increases, further weakening the attenuation effect on the service optical signal.

[0045] It should be noted that the optical detection signal inserted into the doped optical waveguide may be a single wavelength or multiple wavelengths, which is not limited in the present disclosure.

[0046] In a first aspect, the present disclosure provides an optical distribution network. Figure 4 is a schematic diagram of the structure of an optical distribution network provided by the present disclosure. As shown in Figure 4, the optical distribution network includes a doped optical waveguide 34. An optical detection signal modifies the absorption coefficient of a service optical signal in the doped optical waveguide to adjust the power of the service optical signal. The wavelength of the optical detection signal differs from the wavelength of the service optical signal.

[0047] When the optical detection signal and the service optical signal are transmitted in a doped optical waveguide, part of the power of the optical detection signal is converted into ASE noise. Compared to a doped optical waveguide carrying only the service optical signal, since part of the ASE noise comes from the optical detection signal, the attenuation effect of the service optical signal is weakened. In other words, the insertion loss of the service optical signal is reduced, making the transmission of the service optical signal more stable and the service optical signal received by the ONT stronger.

[0048] As shown in Figure 4, the optical distribution network also includes N levels of optical splitters, M filters, and K doped optical waveguides 34. Each level of optical splitters includes at least one optical splitter 32, where N, M, and K are all positive integers. Each optical splitter 32 in the at least one optical splitter includes multiple branch ports 321. A filter 33 is provided in the optical path of at least one of the multiple branch ports 321. The filter 33 is connected in series with the input end of the doped optical waveguide 34. The filter 33 is configured to select the wavelength of the optical detection signal, that is, to control the on / off of the optical detection signal, such as passing, blocking, and reflecting the optical detection signal. The filter 33 can include a passband, stopband, or narrowband reflective filter. However, the filter is transmissive to both upstream and downstream PON service optical signals. A doped optical waveguide 34 is provided in the optical path after the filter 33. The absorption spectrum of the doped optical waveguide 34 includes the wavelength of the optical detection signal and the service optical signal.

[0049] By way of example, the optical distribution network includes two cascaded optical splitters, namely, a first-stage optical splitter L1 and a second-stage optical splitter L2. The first-stage optical splitter L1 and the second-stage optical splitter L2, as well as the second-stage optical splitter L2 and the ONT 4, are connected via optical waveguide signals. For ease of description, in this disclosure, the optical waveguide before the input port of the first-stage optical splitter L1 is referred to as a backbone optical waveguide, the optical waveguide between the output of the first-stage optical splitter L1 and the input of the second-stage optical splitter L2 is referred to as a distribution optical waveguide, and the optical waveguide after the output of the second-stage optical splitter L2 is referred to as a branch optical waveguide.

[0050] Each level of the optical splitter includes multiple branch ports 321, and each branch port 321 is provided with at least one filter 33 and a doped optical waveguide 34. Since the insertion loss of the service optical signal will be reduced after the doped optical waveguide 34 inserts the optical detection signal, in the present disclosure, each branch port 321 only needs to be provided with one doped optical waveguide 34.

[0051] In some embodiments, the optical distribution network further includes a wavelength division multiplexing module 31, which is disposed between the optical detection signal transceiver module 11, the optical line terminal OLT optical transceiver module 12 and the optical splitter 32, and is used to merge and separate optical signals.

[0052] In some embodiments, the optical detection signal includes at least one of a saturated absorption mode signal and a wavelength-tunable optical time-domain reflectometer (OTDR) mode signal.

[0053] The saturated absorption mode signal is used to change the absorption coefficient of the service optical signal. Compared to inserting a non-saturated absorption mode signal into the doped optical waveguide, inserting the saturated absorption mode signal into the doped optical waveguide can reduce the service optical signal's insertion loss. Furthermore, the power change of the service optical signal can be used to determine whether the power change is caused by the service optical signal's own fluctuations or by the inserted saturated absorption mode signal.

[0054] In some embodiments, the saturated absorption mode signal includes a tunable wavelength saturated absorption mode signal and a fixed wavelength saturated absorption mode signal.

[0055] In some embodiments, the saturated absorption mode signal includes at least one of a continuous optical signal, an OTDR pulse optical signal, a pulse-coded optical signal, and a linear frequency modulation (LFM) optical signal. In practical applications, the saturated absorption mode signal can be switched as needed. For example, the saturated absorption mode signal can be selected as a continuous optical signal, a pulse-coded optical signal, or an LFM optical signal as needed.

[0056] Tunable-wavelength OTDR mode signals are used to monitor the optical link quality and topology of optical distribution networks. Similar to saturated absorption mode signals, tunable-wavelength OTDR mode signals can also reduce insertion loss in service optical signals. Based on the power variation of the service optical signal and the wavelength of the tunable-wavelength OTDR mode signal, the correspondence between the optical network terminal and the splitter's branch port can be determined, thereby determining the topology of the optical distribution network.

[0057] In some embodiments, the tunable wavelength OTDR mode signal includes at least one of a pulsed light signal, a pulse-coded light signal, and an LFM light signal. In practical applications, the tunable wavelength OTDR mode signal can be switched as needed. For example, the tunable wavelength OTDR mode signal can be selected from a pulsed light signal, a pulse-coded light signal, or an LFM light signal as needed.

[0058] In some embodiments, the characteristics of the doped optical waveguide are important factors affecting the power variation of the service optical signal. Therefore, configuring different branch ports with doped optical waveguides of different characteristics can change the power variation of the service optical signal. The lengths of the doped optical waveguides corresponding to the branch ports in the optical distribution network can be different or the same, and the doping element content of the doped optical waveguides corresponding to the branch ports can also be different or the same, that is, the lengths of the different doped optical waveguides can be different or the same; and / or the doping element content of the different doped optical waveguides can be different or the same. Changing the characteristics of the doped optical waveguides can change the power variation of the service optical signal.

[0059] A doped optical waveguide has different absorption coefficients for optical signals of different wavelengths. In the present disclosure, the wavelength of the optical detection signal is within the absorption spectrum of the doped optical waveguide. The wavelength of the service optical signal is also within the absorption spectrum of the doped optical waveguide. For example, the wavelength of at least one service optical signal is within the absorption spectrum of the doped optical waveguide.

[0060] Figure 5 shows the absorption spectrum of an erbium-doped optical waveguide for a single wavelength. The abscissa represents the wavelength in nanometers (nm), and the ordinate represents the absorption coefficient in decibels per meter (dB / m). As shown in Figure 5, the absorption coefficient of the erbium-doped optical waveguide for light with a wavelength of 1530 nm is shown.

[0061] Figure 6 shows the absorption spectrum of an erbium-doped optical waveguide at two wavelengths. The abscissa represents wavelength in nanometers (nm), and the ordinate represents the absorption coefficient in decibels per meter (dB / m). Figure 6 shows the absorption coefficient spectrum of the erbium-doped optical waveguide at wavelengths of 1490 nm and 1580 nm when two wavelengths are present simultaneously.

[0062] Figure 7 shows the absorption spectrum of an erbium-doped optical waveguide for three wavelengths. The abscissa represents wavelength in nanometers (nm), and the ordinate represents the absorption coefficient in decibels per meter (dB / m). Figure 7 shows the absorption coefficients (spectrum) of the erbium-doped optical waveguide for light at wavelengths of 1490 nm, 1530 nm, and 1580 nm when the three wavelengths are present simultaneously.

[0063] It should be noted that the wavelengths of 1490nm and 1580nm correspond to the downlink service wavelengths of the Gigabit Passive Optical Network (GPON) and the 10G (symmetric) Passive Optical Network (XG(S)PON), respectively. The erbium-doped optical waveguide in this disclosure is also applicable to future PONs as long as the wavelength is within the absorption spectrum range of the erbium-doped optical waveguide.

[0064] In some implementations, the wavelength of the optical detection signal lies within the peak absorption band of the doped optical waveguide. This peak absorption band can more effectively reduce insertion loss and increase power variation of the service optical signal, thereby facilitating topology visualization and fault detection.

[0065] In a second aspect, the present disclosure provides an optical distribution system. As shown in Figure 4 , the optical distribution system includes an optical detection signal transceiver module 11, an optical line terminal (OLT) optical transceiver module 12, an optical terminal (ONT) 4, and an optical network (ODN) 3. The ODN 3 is configured to establish a signal connection between the optical detection signal transceiver module 11 and the ONT 4, and to establish a signal connection between the OLT optical transceiver module 12 and the ONT 4. The ODN 3 utilizes the optical distribution network provided in the first aspect, and will not be further described here.

[0066] In ODN3, since a doped optical waveguide is provided at the branch port, when the optical detection signal and the service optical signal are transmitted in the doped optical waveguide, part of the power of the optical detection signal is converted into ASE noise. However, compared with the case where only the service optical signal is transmitted in the doped optical waveguide, since part of the ASE noise comes from the optical detection signal, the attenuation effect of the service optical signal is weakened. In other words, the insertion loss of the service optical signal is reduced, making the transmission of the service optical signal more stable and the service optical signal received by the ONT stronger.

[0067] In some embodiments, the optical detection signal transceiver module 11 includes an adjustable wavelength dual-mode optical transmission module, which is configured to generate an optical detection signal. The optical detection signal includes at least one of a saturated absorption mode signal and an adjustable wavelength OTDR mode signal. The saturated absorption mode signal is used to change the absorption coefficient of the service optical signal; the saturated absorption mode signal includes an adjustable wavelength saturated absorption mode signal and a fixed wavelength saturated absorption mode signal. The adjustable wavelength OTDR mode signal is used to detect the optical link quality and topology of the optical distribution network. The adjustable wavelength dual-mode optical transmission module is different from the PUMP light and does not require an optical switch, which simplifies the structure of the optical detection signal transceiver module 11, thereby simplifying the structure of the optical distribution system.

[0068] Figure 8 is a block diagram of a wavelength-tunable dual-mode optical transmission module provided by the present disclosure. As shown in Figure 8, the wavelength-tunable dual-mode optical transmission module includes a wavelength-tunable light source 81, an external modulator 82, a driver 83, and an optical amplifier 84. The wavelength-tunable light source 81 is configured to generate light with an adjustable wavelength. The driver 83 is configured to drive the external modulator 82. Under the drive of the driver 83, the external modulator 82 modulates the wavelength-tunable light to obtain an optical detection signal. The optical amplifier 84 is configured to amplify the optical detection signal.

[0069] Figure 9 is a block diagram of a wavelength-tunable dual-mode optical transmission module provided by the present disclosure. As shown in Figure 9, the wavelength-tunable dual-mode optical transmission module includes a wavelength-tunable direct-modulation light emitter 91, a driver 92, and an optical amplifier 93. The driver 92 is configured to drive the wavelength-tunable direct-modulation light emitter 91. The wavelength-tunable direct-modulation light emitter 91 generates a light detection signal under the drive of the driver 92. The optical amplifier 93 is configured to amplify the light detection signal.

[0070] In some embodiments, the optical detection signal is an optical signal of a single wavelength, and the optical detection signal includes at least one of a single pulse signal, a coded pulse signal, and an LFM signal.

[0071] The optical distribution system provided by the present disclosure converts part of the energy of the optical detection signal into ASE noise through the optical distribution network provided by the first aspect above, so that the energy of the service optical signal converted into ASE noise is reduced, thereby causing the attenuation effect of the service optical signal in the doped optical waveguide to be weakened, thereby reducing the insertion loss of the service optical signal, and indirectly leading to an enhancement of the service optical signal received by the ONT. The doped optical waveguide only requires a single doped optical waveguide to adjust the power of the service optical signal, thereby simplifying the structure of the optical distribution network; moreover, the doped optical waveguide does not require the use of PUMP light, thereby simplifying the structure of the optical distribution system, thereby reducing the manufacturing cost of the optical distribution network and the optical distribution system.

[0072] In a third aspect, the present disclosure provides an optical power perturbation method. The optical power perturbation method includes: utilizing an optical detection signal to adjust the power of a service optical signal in a doped optical waveguide; the optical detection signal adjusts the power of the service optical signal by changing the absorption coefficient of the service optical signal in the doped optical waveguide.

[0073] In some embodiments, the doping element in the doped optical waveguide includes at least one of erbium, thulium, and rubidium.

[0074] In some embodiments, the optical detection signal includes at least one of a saturated absorption mode signal and a tunable wavelength OTDR mode signal. The saturated absorption mode signal is used to change the absorption coefficient of the service optical signal, i.e., it is used to reduce the attenuation of the service optical signal, thereby detecting disturbances in the service optical signal. Saturated absorption mode signals include tunable wavelength saturated absorption mode signals and fixed wavelength saturated absorption mode signals.

[0075] In some embodiments, the saturated absorption mode signal includes at least one of a continuous optical signal, a pulse coded optical signal, and a linear frequency modulated optical signal.

[0076] The tunable wavelength OTDR mode signal is used to detect the topology of the optical distribution network. That is, the tunable wavelength OTDR mode signal is used to reduce the attenuation of the service optical signal and obtain the topology of the optical distribution network based on the power variation of the service optical signal.

[0077] In some embodiments, the tunable wavelength OTDR mode signal includes at least one of an OTDR pulse optical signal, a pulse coded optical signal, and a linear frequency modulated optical signal.

[0078] In some embodiments, the wavelengths of the service optical signal and the optical detection signal fall within the absorption spectrum of the doped optical waveguide. In some embodiments, the wavelength of the optical detection signal falls within the peak absorption band of the doped optical waveguide. This peak absorption band can increase the power variation of the service optical signal, thereby enhancing the perturbation effect.

[0079] In some embodiments, the saturated absorption mode signal and the tunable wavelength OTDR mode signal are the same optical detection signal, such as a linear frequency modulated optical signal, which is transmitted in a doped optical waveguide. The doped optical waveguide uses the saturated absorption mode signal function of the signal to adjust the absorption coefficient of the service optical signal. At the same time, the receiving module in the optical detection signal transceiver module receives the reversely transmitted Rayleigh scattering and Fresnel reflection signals of the tunable wavelength OTDR mode signal function, thereby realizing optical link quality detection and topology restoration of the optical distribution network.

[0080] In some embodiments, the saturated absorption mode signal and the tunable wavelength OTDR mode signal are transmitted in the doped optical waveguide at different times, that is, the saturated absorption mode signal and the tunable wavelength OTDR mode signal are inserted into the doped optical waveguide at different times to adjust the absorption coefficient of the service optical signal, respectively, to obtain an ONT visualization topology and implement optical link quality detection and topology restoration of the optical distribution network.

[0081] In the case where the optical detection signal is a fixed wavelength saturation absorption mode signal, the optical power perturbation method further includes: steps S101 to S104.

[0082] In step S101 , an ONT receives a service optical signal and determines a first power of the service optical signal.

[0083] 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 the optical detection signal. This disclosure does not limit how the ONT determines the first power of the service optical signal based on the service optical signal.

[0084] In step S102, the ONT obtains the service optical signal after power adjustment by the doped optical waveguide, and determines a second power based on the service optical signal after power adjustment.

[0085] When the doped optical waveguide propagates a saturated absorption mode signal, it affects the power of the service optical signal. The ONT determines the second power according to the received service optical signal.

[0086] When the saturated absorption mode signal generated by the adjustable wavelength dual-mode optical transmission module is inserted into the ODN, the doped optical waveguide converts part of the power of the saturated absorption mode signal into ASE noise, changing the absorption coefficient of the service optical signal, reducing the insertion loss of the service optical signal, and indirectly increasing the power of the service optical signal. The ONT receives the service optical adjustment signal (i.e., the service optical signal after power adjustment) and obtains the second power based on the service optical adjustment signal.

[0087] In the present disclosure, the wavelength of the saturated absorption mode signal can be selected by a filter before being transmitted to the doped optical waveguide. In the present disclosure, the filter includes but is not limited to a passband, stopband or narrowband reflective filter.

[0088] When the filter is a band-stop or narrowband reflective filter, it filters the saturated absorption mode signal. Figure 10 shows the transmission spectrum of a band-stop or narrowband reflective filter blocking or attenuating an optical signal. The horizontal axis represents wavelength, and the vertical axis represents transmittance. As shown in Figure 10, when a saturated absorption mode signal passes through a band-stop or narrowband reflective filter, the saturated absorption mode signal of a certain wavelength (the peak portion) is allowed to pass, while the saturated absorption mode signal of other wavelengths is blocked.

[0089] In some embodiments, the wavelengths of the service optical signal and the saturated absorption mode signal are different. When the saturated absorption mode signal is blocked or attenuated by a bandstop or narrowband reflective filter, while the downstream service optical signal passes through the bandstop or narrowband reflective filter, only the service optical signal enters the doped optical waveguide, unaffected by the saturated absorption mode signal, and the power variation of the service optical signal is less than a first threshold. When the saturated absorption mode signal is not blocked or attenuated by the bandstop or narrowband reflective filter, part of the energy of the saturated absorption mode signal is converted into ASE noise in the doped optical waveguide, reducing the absorption coefficient of the service optical signal and the conversion of the downstream service optical signal into ASE noise. The power variation of the service optical signal is relatively large, typically exceeding a second threshold.

[0090] When the saturated absorption mode signal passes through the bandpass filter, the saturated absorption mode signal can pass through the bandpass filter with the same wavelength as the saturated absorption mode signal, while the bandpass filter attenuates or cuts off the saturated absorption mode signal with a wavelength different from the wavelength of the saturated absorption mode signal.

[0091] Figure 11 shows a perspective spectrum of the service optical signal and optical detection signal passing through a bandpass filter in the present disclosure. The horizontal axis represents wavelength, and the vertical axis represents transmittance. As shown in Figure 11, the transmittance of the optical detection signal with the same wavelength as the bandpass filter can be close to 100%, that is, it can pass through the bandpass filter. The transmittance of the optical detection signal with a different wavelength from the bandpass filter is close to 0. For example, the transmittance of the optical detection signal with wavelength channel number "2" is close to 100%, while the transmittance of the optical detection signal with wavelength channel number "1" and "3-8" is close to 0.

[0092] For example, when a saturated absorption mode signal of a first wavelength passes through a bandpass filter of a second wavelength (the second wavelength is different from the first wavelength), the saturated absorption mode signal of the first wavelength is blocked or attenuated by the bandpass filter. Therefore, the saturated absorption mode signal does not affect a downstream service optical signal, and a power variation of the downstream service optical signal is less than a first threshold. When the saturated absorption mode signal of the first wavelength passes through the bandpass filter of the first wavelength with a transmittance close to 100%, part of the energy of the saturated absorption mode signal in the doped optical waveguide is converted into ASE noise, the absorption coefficient of the downstream service optical signal is reduced, and the power variation of the downstream service optical signal is greater than a second threshold.

[0093] Step S103: The ONT determines a first power variation of the service optical signal based on the first power and the second power.

[0094] The ONT calculates the difference between the first power and the second power to obtain a first power variation of the service optical signal.

[0095] Step S104: The ONT determines whether the power gain of the service optical signal received by the optical network terminal is caused by the optical detection signal based on the first power variation of the service optical signal, the first threshold, and the second threshold.

[0096] The first threshold and the second threshold are preset, and the first threshold is less than or equal to the second threshold.

[0097] When the first power variation is less than the first threshold, the power gain of the service optical signal is caused by the power fluctuation of the service optical signal itself; when the first power variation is greater than the second threshold, the power gain of the service optical signal is caused by the optical detection signal.

[0098] In some embodiments, the optical power disturbance method further includes: determining the connection relationship between the ONT and the branch port of the splitter based on the first power change of the service optical signal and the corresponding relationship between the power change and the doped optical waveguide connected in series with the branch port of the splitter; and determining the topology of the optical network terminal based on the corresponding connection relationship between the optical network terminal and the branch port of the splitter.

[0099] The power variation of the service optical signal corresponds to the characteristics of the doped optical waveguide. Doped optical waveguides with different characteristics cause different power variations of the service optical signal. After presetting the correspondence between the characteristics of the doped optical waveguide and the branch port of the optical splitter, the connection relationship between the ONT and the branch port of the optical splitter can be determined based on the first power variation and the correspondence between the power variation and the doped optical waveguide connected in series with the branch port of the optical splitter. Then, based on the corresponding connection relationship between the optical network terminal and the branch port of the optical splitter, the topology of the optical network terminal is determined.

[0100] In some embodiments, when the optical detection signal is a wavelength-adjustable saturated absorption mode signal, the optical power perturbation method further includes steps S201 to S205.

[0101] In step S201, an ONT receives a service optical signal from an optical line terminal and determines a third power of the service optical signal.

[0102] The third power of the service optical signal is the power of the service optical signal actually received by the ONT in the absence of the optical detection signal. This disclosure does not limit how the ONT determines the third power of the service optical signal based on the service optical signal.

[0103] In step S202, the ONT obtains a service optical signal after power adjustment via the doped optical waveguide, and determines a fourth power based on the service optical signal after power adjustment.

[0104] After the tunable wavelength saturated absorption mode signal passes through the filter, the absorption coefficient of the service optical signal is adjusted in the doped optical waveguide. Part of the energy of the tunable wavelength saturated absorption mode signal is converted into ASE noise, which reduces the absorption coefficient of the service optical signal, thereby reducing the insertion loss of the service optical signal and indirectly increasing the power of the service optical signal. The fourth power can be determined based on the adjusted service optical signal.

[0105] Step S203: The ONT determines a second power variation of the service optical signal based on the third power and the fourth power.

[0106] The ONT calculates the difference between the third power and the fourth power to obtain a second power variation of the service optical signal.

[0107] In step S204, 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 center wavelength of the tunable wavelength saturated absorption mode signal and the filter of the branch port of the optical splitter.

[0108] The central wavelength of the tunable wavelength saturated absorption mode signal is the central wavelength allowed to pass by the filter, and different filters have different central wavelengths of the tunable wavelength saturated absorption mode signal that pass or block.

[0109] In the present disclosure, the filter is selective for the wavelength of the optical signal. The center wavelength of the tunable wavelength saturated absorption mode signal passing through the filter corresponds to the filter, and the branch port of the optical splitter corresponds to the filter. That is, the center wavelength of the tunable wavelength saturated absorption mode signal corresponds to the branch port of the optical splitter. The branch port of the optical splitter can be determined based on the center wavelength of the tunable wavelength saturated absorption mode signal passing through the filter. Based on this, the ONT determines the center wavelength of the tunable wavelength saturated absorption mode signal that the filter allows or blocks to pass based on the second power change and the center wavelength of the tunable wavelength saturated absorption mode signal. Then, based on the center wavelength of the tunable wavelength saturated absorption mode signal that the filter allows or blocks to pass through, and the correspondence between the center wavelength and the branch port of the optical splitter, the branch port of the optical splitter to which the ONT is connected is determined.

[0110] Step S205: Determine the topology of the ONT based on the correspondence between the ONT and the branch ports of the optical splitter.

[0111] Based on the correspondence between each ONT and the branch port of the optical splitter, the topology of the ONT is determined.

[0112] In some embodiments, the optical power disturbance method further includes: obtaining optical waveguide link curves of the optical link terminal and the optical network terminal; determining the position of the splitter, the backbone optical waveguide length, the distributed optical waveguide length, and the branch optical waveguide length in the optical distribution network based on the optical waveguide link curve; and determining the topology of the optical distribution network based on the position of the splitter, the backbone optical waveguide length, the distributed optical waveguide length, and the branch optical waveguide length in the optical distribution network.

[0113] In some implementations, when the optical detection signal is a wavelength-tunable OTDR mode signal, the optical power disturbance method further includes steps S301 to S305.

[0114] In step S301, an ONT receives a service optical signal from an optical line terminal and determines a third power of the service optical signal.

[0115] In step S302, the ONT obtains a service optical signal after power adjustment via the doped optical waveguide, and determines a fourth power based on the service optical signal after power adjustment.

[0116] Step S303: The ONT determines a second power variation of the service optical signal based on the third power and the fourth power.

[0117] Steps S301 to S303 are the same as steps S201 to S203 and will not be described again here.

[0118] Step S304: 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 center wavelength of the tunable wavelength OTDR mode signal and the filter of the branch port of the optical splitter.

[0119] The central wavelength of the tunable wavelength OTDR mode signal is the central wavelength allowed to pass by the filter. Different filters have different central wavelengths of the tunable wavelength OTDR mode signal that pass or block.

[0120] In the present disclosure, the center wavelength of the tunable wavelength OTDR mode signal corresponds to the filter, and the branch port of the optical splitter corresponds to the filter. Therefore, the center wavelength of the tunable wavelength OTDR mode signal corresponds to the branch port of the optical splitter, and the branch port of the optical splitter can be determined based on the center wavelength of the tunable wavelength OTDR mode signal that passes through the filter. Based on this, the ONT determines the center wavelength of the tunable wavelength OTDR mode signal that the filter allows or blocks based on the second power change and the center wavelength of the tunable wavelength OTDR mode signal. Then, based on the center wavelength of the tunable wavelength OTDR mode signal that the filter allows or blocks, and the correspondence between the center wavelength and the branch port of the optical splitter, the branch port of the optical splitter to which the ONT is connected is determined.

[0121] Step S305: Determine the topology of the ONT based on the correspondence between the ONT and the branch ports of the optical splitter.

[0122] Based on the correspondence between each ONT and the branch port of the optical splitter, the topology of the ONT is determined.

[0123] Step S305 is the same as step S205.

[0124] It should be noted that, in the optical power perturbation method provided by the present invention, the same filter can be used for the adjustable wavelength OTDR mode signal and the adjustable wavelength saturated absorption mode signal with the same wavelength. That is, for the adjustable wavelength OTDR mode signal and the adjustable wavelength saturated absorption mode signal, as long as the same wavelength is used, there is no need to replace the filter. This not only realizes the disturbance of optical power by different mode signals, but also simplifies the structure of the optical distribution system.

[0125] In some embodiments, the optical power disturbance method further includes: obtaining Rayleigh backscattering and Fresnel reflection signals generated when the adjustable wavelength OTDR mode signal is transmitted in the optical distribution network; obtaining an OTDR optical link quality curve based on the Rayleigh backscattering and Fresnel reflection signals, the OTDR optical link quality curve being the correspondence between the power of the Rayleigh backscattering and Fresnel reflection signals and the distance of the optical waveguide, where the optical waveguide is the medium connecting the ONT and the splitter.

[0126] The optical power disturbance method provided by the present disclosure is that when the service optical signal and the optical detection signal are transmitted in a doped optical waveguide, since the wavelength of the optical detection signal is different from that of the service optical signal, part of the energy of the optical detection signal is converted into ASE noise, and the doped optical waveguide forms a new absorption effect on the service optical signal and the optical detection signal. Therefore, the energy of the service optical signal converted into ASE noise is reduced, thereby causing the attenuation effect of the service optical signal in the doped optical waveguide to be weakened, thereby reducing the insertion loss of the service optical signal, and indirectly causing the service optical signal received by the ONT to be enhanced. The doped optical waveguide only requires a single doped optical waveguide to adjust the power of the service optical signal, thereby simplifying the structure of the optical distribution network; moreover, the doped optical waveguide does not require the use of PUMP light, thereby simplifying the structure of the optical distribution system, thereby reducing the manufacturing cost of the optical distribution network and the optical distribution system.

[0127] In the fourth aspect, referring to Figure 12, the present disclosure provides an electronic device, including: at least one processor 1201; and a memory 1202, on which at least one computer program is stored, when the at least one computer program is executed by the at least one processor 1201, the at least one processor 1201 implements the above-mentioned optical power disturbance method; and at least one I / O interface 1203, connected between the processor 1201 and the memory 1202, configured to realize information interaction between the processor 1201 and the memory 1202.

[0128] The processor 1201 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 1202 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read-write interface) 1203 is connected between the processor 1201 and the memory 1202, and can realize information interaction between the processor 1201 and the memory 1202, including but not limited to a data bus (Bus), etc.

[0129] In some implementations, the processor 1201 , the memory 1202 , and the I / O interface 1203 are connected to each other via a bus 1204 , and further connected to other components of the computing device.

[0130] In some implementations, the processor 501 adjusts the power of the service optical signal in the doped optical waveguide using an optical detection signal; the optical detection signal adjusts the power of the service optical signal by changing the absorption coefficient of the service optical signal in the doped optical waveguide.

[0131] In some embodiments, the optical detection signal includes at least one of the following signals: a saturated absorption mode signal for changing the absorption coefficient of the service optical signal; and a tunable wavelength OTDR mode signal for detecting the optical link quality and topology of the optical distribution network.

[0132] In some embodiments, the saturated absorption mode signal includes a tunable wavelength saturated absorption mode signal and a fixed wavelength saturated absorption mode signal. The saturated absorption mode signal and the tunable wavelength OTDR mode signal are transmitted in the doped optical waveguide at the same time; alternatively, the saturated absorption mode signal and the tunable wavelength OTDR mode signal are transmitted in the doped optical waveguide at different times.

[0133] In some embodiments, the tunable wavelength OTDR mode signal includes at least one of an OTDR pulse optical signal, a pulse coded optical signal, and a linear frequency modulated optical signal; the saturated absorption mode signal includes at least one of a continuous optical signal, a pulse coded optical signal, and a linear frequency modulated optical signal.

[0134] In some embodiments, the wavelengths of the service optical signal and the optical detection signal are within the absorption spectrum of the doped optical waveguide.

[0135] In some embodiments, the wavelength of the optical detection signal is located in the absorption peak band of the doped optical waveguide.

[0136] In some embodiments, when the optical detection signal is a fixed wavelength saturated absorption mode signal, the processor 501 is further configured to: the optical network terminal receives the service optical signal and determines a first power of the service optical signal; the optical network terminal obtains the service optical signal after power adjustment by the doped optical waveguide, and determines a second power based on the service optical signal after power adjustment; the optical network terminal determines a first power change of the service optical signal based on the first power and the second power; the optical network terminal determines whether the power gain of the service optical signal received by the optical network terminal is caused by the optical detection signal based on the first power change of the service optical signal, a first threshold value and a second threshold value; the first threshold value and the second threshold value are pre-set; and / or, based on the first power change of the service optical signal and the correspondence between the power change and the doped optical waveguide connected in series with the branch port of the splitter, determine the connection relationship between the optical network terminal and the branch port of the splitter; based on the connection relationship between the optical network terminal and the branch port of the splitter, determine the topology of the optical network terminal.

[0137] In some embodiments, when the optical detection signal is a signal in an adjustable wavelength saturated absorption mode, the processor 501 is further configured as follows: the optical network terminal receives a service optical signal from the optical line terminal and determines a third power of the service optical signal; the optical network terminal obtains the service optical signal after power adjustment by the doped optical waveguide, and determines a fourth power based on the service optical signal after power adjustment; the optical network terminal determines a second power change of the service optical signal based on the third power and the fourth power; the optical network terminal determines a correspondence between the optical network terminal and the branch port of the splitter based on the second power change of the service optical signal and the correspondence between the center wavelength of the adjustable wavelength saturated absorption mode signal and the filter of the branch port of the splitter; and the topology of the optical network terminal is determined based on the correspondence between the optical network terminal and the branch port of the splitter.

[0138] In some embodiments, the processor 501 is further configured to obtain Rayleigh backscattering and Fresnel reflection signals generated when the adjustable wavelength OTDR mode signal is transmitted in the optical distribution network; and obtain an OTDR optical link quality curve based on the Rayleigh backscattering and Fresnel reflection signals. The OTDR optical link quality curve is a correspondence between the power of the Rayleigh backscattering and Fresnel reflection signals and the distance of the optical waveguide, where the optical waveguide is a medium connecting the optical network terminal and the splitter.

[0139] In a fifth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, and the computer program is executed by a processor, so that the processor implements the above-mentioned optical power disturbance method.

[0140] 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 temporary 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 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 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 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 may include any information delivery media.

[0141] 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 purposes of limitation. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly stated, 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, it will be understood by those skilled in the art 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. An optical distribution network includes a doped optical waveguide. An optical detection signal changes the absorption coefficient of a service optical signal in the doped optical waveguide to adjust the power of the service optical signal. The wavelength of the optical detection signal is different from the wavelength of the service optical signal.

2. The optical distribution network according to claim 1, wherein, It further includes an N-stage optical splitter, M filters, and K doped optical waveguides. Each stage of the optical splitter includes at least one optical splitter. N, M, and K are all positive integers. Each of the at least one optical splitter includes a plurality of branch ports. At least one of the plurality of branch ports is provided with the filter. The filter is connected in series with the input end of the doped optical waveguide. The filter is used to select the wavelength of the optical detection signal and pass the service optical signal. Wherein, the selection of the wavelength of the optical detection signal includes passing, blocking, or reflecting the optical detection signal.

3. The optical distribution network according to claim 1 or 2, wherein The optical detection signal includes at least one of the following: A saturated absorption mode signal for changing the absorption coefficient of the service optical signal. An optical time domain reflectometer (OTDR) mode signal with adjustable wavelength for detecting the optical link quality and topology of the optical distribution network.

4. The optical distribution network according to claim 3, wherein The saturated absorption mode signal includes an adjustable wavelength saturated absorption mode signal and a fixed wavelength saturated absorption mode signal.

5. The optical distribution network according to claim 3, wherein The saturated absorption mode signal includes at least one of a continuous optical signal, a pulse-coded optical signal, and a chirped optical signal. The adjustable wavelength OTDR mode signal includes at least one of a pulsed optical signal, a pulse-coded optical signal, and a chirped optical signal.

6. The optical distribution network according to claim 2, wherein, The characteristics of the doped optical waveguide include at least one of the following: The lengths of different doped optical waveguides are different or the same. The contents of the doping elements in different doped optical waveguides are different or the same.

7. The optical distribution network according to claim 1, wherein, The doping elements in the doped optical waveguide include at least one of erbium, thulium, and rubidium.

8. An optical distribution system includes an optical detection signal transceiver module, an optical line terminal (OLT) optical transceiver module, an optical network terminal, and the optical distribution network according to any one of claims 1 to 7. The optical distribution network is configured to signal-connect the optical detection signal transceiver module and the optical network terminal, and to signal-connect the OLT optical transceiver module and the optical network terminal.

9. The optical distribution system according to claim 8, wherein, The optical detection signal transceiver module includes an adjustable wavelength dual-mode optical transmission module configured to generate the optical detection signal.

10. The optical distribution system according to claim 9, wherein, The adjustable wavelength dual-mode optical transmission module includes an adjustable wavelength light source, an external modulator, a driver, and an optical amplifier. Wherein, the adjustable wavelength light source is configured to generate adjustable wavelength light. The driver is configured to drive the external modulator. The external modulator modulates the adjustable wavelength light under the drive of the driver to obtain the optical detection signal. The optical amplifier is configured to perform amplification processing on the optical detection signal.

11. The optical distribution system according to claim 9, wherein, The adjustable wavelength dual-mode optical transmission module includes an adjustable wavelength directly modulated laser, a driver, and an optical amplifier. Wherein, the driver is configured to drive the adjustable wavelength directly modulated laser. The adjustable wavelength directly modulated laser generates the optical detection signal under the drive of the driver. The optical amplifier is configured to perform amplification processing on the optical detection signal.

12. An optical power perturbation method, which performs the steps by using the optical distribution system according to any one of claims 8 to 11, includes: Adjusting the power of the service optical signal in the doped optical waveguide by using an optical detection signal; wherein, the optical detection signal adjusts the power of the service optical signal by changing the absorption coefficient of the service optical signal in the doped optical waveguide.

13. The optical power perturbation method according to claim 12, wherein, The optical detection signal includes at least one of the following signals: A saturated absorption mode signal for performing perturbation detection on the service optical signal; An adjustable wavelength OTDR mode signal for detecting the optical link quality and topological structure of the optical distribution network.

14. The optical power perturbation method according to claim 13, wherein, The saturated absorption mode signal includes an adjustable wavelength saturated absorption mode signal and a fixed wavelength saturated absorption mode signal.

15. The optical power perturbation method according to claim 13, wherein, The saturated absorption mode signal and the adjustable wavelength OTDR mode signal are the same optical detection signal and are transmitted at the same time in the doped optical waveguide; or, the saturated absorption mode signal and the adjustable wavelength OTDR mode signal are the same optical detection signal or different optical detection signals and are transmitted at different times in the doped optical waveguide.

16. The optical power perturbation method according to claim 13, wherein, The adjustable wavelength OTDR mode signal includes at least one of a pulsed optical signal, a pulse-coded optical signal, and a chirped optical signal; The saturated absorption mode signal includes at least one of a continuous optical signal, a pulse-coded optical signal, and a chirped optical signal.

17. The optical power perturbation method according to claim 13, wherein, The wavelengths of the service optical signal and the optical detection signal are within the absorption spectrum range of the doped optical waveguide.

18. The optical power perturbation method according to claim 17, wherein, The wavelength of the optical detection signal is within the peak band of the absorption effect of the doped optical waveguide.

19. The optical power perturbation method according to claim 13, wherein, In the case where the optical detection signal is a fixed wavelength saturated absorption mode signal, the method further includes: The optical network terminal receives the service optical signal and determines the first power of the service optical signal; The optical network terminal obtains the service optical signal with the power adjusted by the doped optical waveguide and determines the second power based on the service optical signal with the adjusted power; The optical network terminal determines the first power change amount of the service optical signal based on the first power and the second power; The optical network terminal determines whether the power gain of the service optical signal received by the optical network terminal is caused by the optical detection signal based on the first power change amount of the service optical signal, a first threshold, and a second threshold; wherein, the first threshold and the second threshold are preset.

20. The optical power perturbation method according to claim 19, the optical power perturbation method further includes: Determining the connection relationship between the optical network terminal and the branch port of the optical 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 optical splitter; Determining the topological structure of the optical network terminal based on the connection relationship between the optical network terminal and the branch port of the optical splitter.

21. The optical power perturbation method according to claim 13, wherein, In the case where the optical detection signal is an adjustable wavelength saturated absorption mode signal, the method further includes: The optical network terminal receives the service optical signal from the optical line terminal and determines the third power of the service optical signal; The optical network terminal obtains the service optical signal after the power is adjusted by the doped optical waveguide, and determines a fourth power based on the service optical signal after the power is adjusted; The optical network terminal determines a second power change amount of the service optical signal based on the third power and the fourth power; The optical network terminal determines the corresponding relationship between the optical network terminal and the branch port of the optical splitter according to the second power change amount of the service optical signal and the corresponding relationship between the central wavelength of the tunable wavelength saturation absorption mode signal and the filter of the branch port of the optical splitter; Based on the corresponding relationship between the optical network terminal and the branch port of the optical splitter, the topological structure of the optical network terminal is determined.

22. The optical power perturbation method according to claim 13, wherein, When the optical detection signal is a tunable wavelength OTDR mode signal, the method further includes: The optical network terminal receives the service optical signal from the optical line terminal and determines a third power of the service optical signal; The optical network terminal obtains the service optical signal after the power is adjusted by the doped optical waveguide, and determines a fourth power based on the service optical signal after the power is adjusted; The optical network terminal determines a second power change amount of the service optical signal based on the third power and the fourth power; The optical network terminal determines the corresponding relationship between the optical network terminal and the branch port of the optical splitter according to the second power change amount of the service optical signal and the corresponding relationship between the central wavelength of the tunable wavelength OTDR mode signal and the filter of the branch port of the optical splitter; Based on the corresponding relationship between the optical network terminal and the branch port of the optical splitter, the topological structure of the optical network terminal is determined.

23. The optical power perturbation method according to claim 22, further includes: Obtaining Rayleigh backscattering and Fresnel reflection signals generated when the tunable wavelength OTDR mode signal is transmitted in the optical distribution network; wherein, for the tunable wavelength OTDR mode signal and the tunable wavelength saturation absorption mode signal with the same wavelength, the same filter is used; Obtaining an OTDR optical link quality curve based on the Rayleigh backscattering and Fresnel reflection signals, wherein the OTDR optical link quality curve is the corresponding relationship between the power of the Rayleigh backscattering and Fresnel reflection signals and the distance of the optical waveguide, and the optical waveguide is a medium connecting the optical network terminal and the optical splitter.

24. The optical power perturbation method according to claim 12, wherein, The doping element in the doped optical waveguide includes at least one of erbium, thulium, and rubidium.

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