A fiber-based distributed dimmable light system and dimming method

Abstract

The application discloses a kind of distributed adjustable light systems and light adjusting method based on optical fiber, the system includes: light source module, optical fiber transmission unit, multiple light intensity modulation module, control module and multiple terminal light outlet unit;Constant light beam output by light source module is coupled into optical fiber transmission unit, and is branched into multiple branch light paths by the three-stage light splitting topological structure of optical fiber transmission unit and is transmitted to corresponding light outlet node;Each light intensity modulation module is respectively arranged in multiple branch light paths;Control module is signal connected with each light intensity modulation module, and adjacent light outlet node is divided into at least one neighbor group according to physical area;Each terminal light outlet unit is respectively arranged at the output end of each light outlet node, and the modulated light beam is homogenized and diffused output.Through the optical fiber transmission architecture of three-stage light splitting topological structure cooperates with the light intensity modulation module of distributed deployment, the technical problems that traditional electric light adjusting system is insufficient in stability, multiple node light intensity consistency is poor, long-distance transmission attenuation is obvious are solved.

Description

Technical Field

[0001] This invention relates to the field of fiber optic lighting and intelligent dimming technology, and in particular to a fiber-optic-based distributed dimmable system and dimming method. Background Technology

[0002] With the development of the smart lighting industry, the demand for dimmable systems in residential, industrial, and commercial scenarios continues to increase. Currently, most mainstream dimming solutions are based on electrical signal control: for example, using LED driver chips combined with PWM pulse width modulation or SCR voltage regulation to achieve brightness adjustment. While these solutions have simple circuit structures, they suffer from problems such as flickering during dimming, color temperature shift, and electromagnetic interference. They also exhibit poor stability in complex electromagnetic environments, and the control signal attenuates significantly over long distances, making them unsuitable for large-area distributed lighting scenarios. Another approach uses dedicated lighting protocols such as DALI and DMX512 to build networked dimming systems, enabling precise multi-point control. However, these systems have complex architectures, high deployment costs, and require independent control cabling, resulting in a large workload for wiring and maintenance.

[0003] Fiber optic technology, with its advantages of resistance to electromagnetic interference, low transmission loss, and high security, has achieved large-scale application in the communications field and has gradually extended to lighting and sensing fields in recent years. However, existing fiber optic-based dimming solutions still have significant drawbacks: First, most adopt a centralized light intensity control architecture, performing unified dimming only at the light source side, and cannot independently adjust each branch output node. Due to the difference in fiber loss across different links, the light intensity consistency at the end output node is poor. Second, dimming control relies heavily on independent electrical signal lines, failing to fully utilize the transmission capacity of fiber optics and failing to fully leverage the advantages of cabling. Third, there is a lack of regional collaborative control mechanisms, making it impossible to collaboratively optimize the light intensity uniformity of multiple nodes within the same lighting area, thus failing to meet the demands of high-quality lighting. Fourth, most solutions lack redundant link design, and a single link failure can easily lead to lighting failure in the corresponding area, resulting in insufficient reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a distributed tunable optical fiber system and dimming method to solve the problems mentioned in the background art.

[0005] A first aspect of the present invention provides a distributed tunable optical system based on optical fiber, comprising a light source module, an optical fiber transmission unit, multiple intensity modulation modules, a control module, and multiple terminal output units. A constant beam output from the light source module is coupled into the optical fiber transmission unit, split into multiple branch optical paths via a three-stage splitting topology, and transmitted to corresponding output nodes. Each intensity modulation module is respectively disposed in one of the multiple branch optical paths, independently adjusting the transmitted light intensity of its corresponding branch optical path. The control module is signal-connected to each intensity modulation module, dividing adjacent output nodes into at least one neighbor group according to physical regions, and outputting a dimming control signal to the corresponding intensity modulation module based on the intensity uniformity requirements within the group. Each terminal output unit is respectively disposed at the output end of each output node, homogenizing and diffusing the modulated beam for output.

[0006] Furthermore, the light source module includes a visible light source and an optical fiber coupling unit; the wavelength of the output beam of the visible light source covers the visible light band, and the optical fiber coupling unit couples the beam output by the visible light source to the input end of the optical fiber transmission unit.

[0007] Furthermore, the three-stage beam splitting topology of the optical fiber transmission unit includes a first-stage beam splitting unit, a second-stage beam splitting branch group, and a third-stage output port group cascaded in sequence; the first-stage beam splitting unit is a planar waveguide beam splitter, used to split the incident beam into at least two redundant transmission optical paths; the second-stage beam splitting branch group includes multiple beam splitting branches corresponding to the number of output paths of the first-stage beam splitting unit, and each beam splitting a single transmission beam into multiple parallel branch optical paths; the third-stage output port group includes several directional beam splitting ports, each directional beam splitting port being respectively disposed at the end of each branch optical path, constituting the output node.

[0008] Furthermore, the light intensity modulation module is a Mach-Zehnder interferometer electro-optic modulator, located at the end of the corresponding branch optical path and the front end of the three-stage output port group. The electro-optic modulator internally includes an input branch waveguide, two interferometer arms, and a combiner output terminal. The dimming control signal is applied to the modulation electrode of the interferometer arm, and the refractive index of the interferometer arm waveguide is changed through the electro-optic effect, so that the transmitted beams of the two arms generate a phase difference. After the combiner interference, the output light intensity can be continuously and steplessly adjusted.

[0009] Furthermore, the control module includes a light intensity acquisition subunit and a collaborative dimming calculation subunit; the light intensity acquisition subunit acquires the actual output light intensity parameters of each light-emitting node and the ambient illuminance parameters of the corresponding lighting area; the collaborative dimming calculation subunit generates dimming control signals for each light intensity modulation module based on the deviation between the preset target light intensity and the actual output light intensity, combined with the ambient illuminance compensation amount and the light intensity uniformity constraint within the neighboring group, thus forming a closed-loop dimming control.

[0010] Furthermore, the branch optical path of the optical fiber transmission unit uses multimode silica fiber as the transmission medium; the dimming control signal output by the control module is transmitted in the same optical fiber as the illumination beam through wavelength division multiplexing, without the need for separate electrical control cables.

[0011] Furthermore, the terminal light output unit includes a collimating lens group and a uniform light diffuser. The modulated beam is collimated and expanded before being output by the uniform light diffuser to form a uniform illumination spot. The system also transmits visible light communication signals through the optical fiber transmission unit, thus having both illumination dimming and short-distance data transmission functions.

[0012] This invention also provides a distributed tunable optical fiber method, implemented based on the above system, comprising the following steps: S1. The light source module outputs a constant beam of light, which is coupled into the optical fiber transmission unit. After being split into multiple branch optical paths by a three-level beam splitting topology, the beams are transmitted to the corresponding output nodes. S2. The control module divides adjacent light-emitting nodes into at least one neighbor group according to the physical region, and configures the target light intensity parameters and the light intensity uniformity threshold within each neighbor group. S3. The control module outputs dimming control signals to the light intensity modulation modules in each branch optical path to independently adjust the transmitted light intensity of the corresponding branch optical path. S4. Each terminal light output unit will homogenize and diffuse the modulated beam in the corresponding branch optical path to achieve multi-node distributed collaborative dimming.

[0013] Furthermore, S3 also includes a closed-loop adjustment step: The system collects the actual output light intensity of each light output node and the corresponding ambient illuminance parameters in real time, calculates the deviation between the actual output light intensity and the target light intensity, and generates a basic dimming signal by combining the ambient illuminance feedforward compensation. Then, based on the light intensity uniformity threshold in the neighboring group, the system performs coordinated fine-tuning of the dimming control signals of each light intensity modulation module in the group, so that the relative deviation of the light intensity of each light output node in the group meets the preset threshold requirements.

[0014] Furthermore, the dimming control signal is transmitted in the same direction as the illumination beam in the same optical fiber medium via wavelength division multiplexing, and after decoupling at the corresponding light output node, it is loaded onto the corresponding light intensity modulation module.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs a three-level split-topology fiber optic transmission architecture combined with a distributed light intensity modulation module, along with a neighbor-group-based regional collaborative dimming mechanism. This enables flexible expansion of multi-node distributed lighting while allowing independent and precise adjustment of the light intensity of each branch optical path, ensuring uniformity of light intensity across all output nodes within the same lighting area. Furthermore, relying on fiber optic media to transmit the lighting beam, it possesses strong resistance to electromagnetic interference, low transmission loss, and stable long-distance transmission characteristics, solving the technical problems of insufficient stability, poor light intensity consistency across multiple nodes, and significant attenuation over long distances in traditional electro-dimming systems.

[0016] 2. This invention uses wavelength division multiplexing (WDM) technology to achieve co-fiber transmission of the lighting beam and dimming control signal, eliminating the need for separate electrical control cables, simplifying the wiring structure of the distributed system, and reducing deployment and maintenance costs. At the same time, the three-level splitting architecture is configured with a primary and backup redundant optical path, which improves the reliability of system operation and can rely on the same optical fiber medium to expand visible light communication functions, realizing the integrated integration of lighting and data transmission. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating the overall structural architecture of the fiber-optic-based distributed tunable optical system of the present invention. Figure 2 This is a flowchart of the fiber-based distributed tunable light method of the present invention; Figure 3 This is a schematic diagram of the dimming process of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] It should be noted that the serial numbers assigned to the components in the embodiments of the present invention, such as "first" and "second", are only used to distinguish the described objects and have no sequential or technical meaning.

[0020] The following is combined with Figure 1This invention describes a fiber-optic-based distributed tunable lighting system, which includes a light source module, a fiber optic transmission unit, multiple intensity modulation modules, a control module, and multiple terminal light output units. The system achieves distributed light transmission from a single light source to multiple nodes through a three-level splitting topology, enables independent intensity control of each node through independent intensity modulation of each branch, ensures uniformity of light intensity in the area through a neighbor group collaborative dimming mechanism, and achieves stable lighting output with high anti-interference capabilities over long distances using the fiber optic medium.

[0021] The light source module includes a visible light source and an optical fiber coupling unit.

[0022] The visible light source can employ a high-power broadband white LED chip, with an output wavelength covering the 380nm~780nm visible light band, a rated output optical power of 5W, and a color rendering index Ra≥90, meeting the spectral and luminous flux requirements of general lighting. For long-distance transmission scenarios, it can also be replaced with a red, green, and blue tri-color laser diode light source, resulting in lower transmission loss and higher brightness. The light source module incorporates a semiconductor cooler and a high-precision thermistor, ensuring a constant output beam intensity.

[0023] The fiber optic coupling unit can employ a two-piece self-focusing lens assembly. A three-dimensional precision adjustment frame aligns and couples the light-emitting surface of the light source with the end face of the optical fiber, coupling the beam output from the visible light source to the input end of the fiber optic transmission unit. After alignment, a double-curing process using UV adhesive and mechanical pressing ensures long-term mechanical stability. An optical isolator with an isolation greater than 30dB is connected in series at the light source output end to block interference from reflected light and ensure the stability of the output beam.

[0024] The optical fiber transmission unit adopts a three-level splitting topology, including a first-level splitting unit, a second-level splitting branch group, and a third-level output port group cascaded in sequence, which is used to split a single-input constant beam into multiple branch optical paths and transmit them to the corresponding output optical nodes.

[0025] The primary beam splitter unit employs a PLC beam splitter to divide the incident beam into two redundant transmission optical paths, serving as the primary and backup optical paths respectively. It can simultaneously carry visible light illumination and near-infrared control light. A magneto-optical switch is configured on the output side of the primary beam splitter unit. During normal operation, the primary optical path is active; when the optical power of the primary optical path is detected to be below 50% of its rated value, it automatically switches to the backup optical path, achieving seamless link redundancy backup.

[0026] Secondary beam splitting branch group: This group comprises multiple beam splitting branches corresponding to the number of output paths of the primary beam splitting unit. Each beam splitting branch employs a multimode interferometric beam splitter to divide a single transmission beam into multiple parallel branch optical paths. These branch optical paths use multimode silica fiber as the transmission medium, supporting long-distance transmission.

[0027] The three-level output port group contains several directional splitting ports, each corresponding to the end of each branch optical path, forming an independent output node. The directional splitting ports use standard LC type fiber optic adapters, supporting quick plug-and-play docking with the optical intensity modulation module and terminal output unit; all output nodes are assigned a unique address number, which is pre-stored in the node mapping table of the control module as the basis for neighbor group division and independent addressing.

[0028] The fiber optic transmission unit in this invention uses CWDM wavelength division multiplexing to couple the visible light illumination beam and the near-infrared OAM light carrying the dimming control signal into the same fiber for co-fiber transmission, eliminating the need for separate electrical control cables. The wavelength division device can adopt a 12-channel CWDM demultiplexing / multiplexing structure, including 6 visible light illumination channels and 6 OAM control channels, with the remaining channels reserved for future expansion. The illumination light operates in the visible light band, while the control light uses the near-infrared band. The two are combined and demultiplexed through a dielectric film filter type wavelength division multiplexer, without interference between them.

[0029] The number of optical intensity modulation modules corresponds one-to-one with the number of branch optical paths. Each optical intensity modulation module is respectively set in one of the multiple branch optical paths, specifically deployed at the end of the corresponding branch optical path and at the front end of the three-stage output port group, for independently adjusting the transmitted optical intensity of the corresponding branch optical path. The end-deployment method can avoid the interference of environmental factors such as temperature, vibration, and bending loss of the front-end link on the modulation accuracy, and can directly compensate for the inherent loss differences of different branch links, ensuring the consistency of optical intensity of each output node.

[0030] The light intensity modulation module employs a lithium niobate-based Mach-Zehnder interferometer electro-optic modulator, internally comprising an input branch waveguide, two interferometer arms, and a combiner output. The input branch waveguide splits the incident beam into two beams of equal power, which then enter the two parallel interferometer arms. Metal modulation electrodes are fabricated above the two arms. The dimming control signal is applied to the modulation electrodes of the interferometer arms, changing the refractive index of the waveguide material through the electro-optic effect, thereby creating a controllable phase difference between the beams transmitted through the two arms. The two beams with a phase difference interfere at the combiner output, and the output light intensity continuously changes with the phase difference, thus achieving continuous stepless adjustment of the output light intensity.

[0031] The typical half-wave voltage of the electro-optic modulator in this invention is 3V to 5V, and the modulation bandwidth can reach the GHz level. The modulator integrates an automatic bias control circuit, which can stabilize the operating point at the half-power point, ensure the optical performance of the modulator, and periodically and automatically calibrate to offset the operating point offset caused by temperature drift and aging.

[0032] The control module is signal-connected to each light intensity modulation module, divides adjacent light-emitting nodes into at least one neighbor group according to physical regions, and outputs dimming control signals to the corresponding light intensity modulation module according to the light intensity uniformity requirements within the group. The control module is based on an ARM Cortex-M series microcontroller (such as an M4 microcontroller) and includes a light intensity acquisition subunit and a collaborative dimming operation subunit.

[0033] Light intensity acquisition subunit: Used to acquire the actual output light intensity parameters of each light-emitting node and the ambient illuminance parameters of the corresponding illumination area. A miniature silicon photodiode is installed on the light-input side of each light-emitting node to sample the actual output light intensity. All acquired signals are amplified, filtered, and then input to the main control via an AD converter; the acquisition circuit can have an automatic dark current calibration function to eliminate acquisition errors caused by temperature drift and device aging.

[0034] The collaborative dimming operation subunit generates dimming control signals for each light intensity modulation module based on the deviation between the preset target light intensity and the actual output light intensity, combined with the ambient illuminance compensation and the light intensity uniformity constraint within the neighbor group, forming a closed-loop dimming control. Neighbor group division supports multiple methods, including automatic clustering based on physical coordinates and manual division based on bright loops. Each neighbor group contains 3 to 8 adjacent light-emitting nodes, corresponding to the same illumination area. The dimming algorithm employs an incremental PID combined with an ambient light feedforward compensation architecture: first, a basic adjustment amount is output based on the deviation between the target light intensity and the actual light intensity; then, the ambient illuminance feedforward compensation amount is superimposed to offset the influence of natural light variations; finally, the dimming voltage of each node is collaboratively fine-tuned based on the light intensity uniformity threshold within the group, resulting in a smooth and stepless adjustment process.

[0035] The dimming control signal output by the control module is modulated onto the near-infrared optical carrier, coupled with the visible light illumination light through a wavelength division multiplexer, and then transmitted in the same optical fiber. After decoupling at the corresponding output node, it is converted into an analog voltage signal and applied to the light intensity modulation module. No separate electrical control cable needs to be laid throughout the process.

[0036] Each of the aforementioned terminal light-emitting units is respectively disposed at the output end of each light-emitting node, and homogenizes and diffuses the modulated light beam for output. Each terminal light-emitting unit includes a collimating lens group and a light-diffusing element, which are integrated into a fixed housing.

[0037] The collimating lens group uses aspherical glass lenses, and the distance between the lens and the fiber end face can be changed through a threaded adjustment mechanism. The light output angle can be continuously adjusted within the range of 15° to 120° to adapt to different needs of accent lighting and floodlighting. The light-diffusing component uses a microlens array diffuser plate with a haze greater than 95%. It can convert the Gaussian distributed incident beam into a Lambertian uniform light spot with a light spot illuminance uniformity of better than 90%, without obvious bright spots, dark areas, or glare.

[0038] This system can also transmit visible light communication signals through the optical fiber transmission unit, and use the amplitude change of light intensity modulation to carry low-speed data. It can achieve short-distance data transmission while realizing lighting dimming. It can be used in scenarios such as environmental sensing data feedback and equipment status monitoring, and has the functions of both lighting dimming and short-distance data transmission.

[0039] The following is combined with Figure 2 and 3 The method for visible light modulation using the aforementioned system is described, and the method includes the following steps: S1. The light source module outputs a constant beam of light, which is coupled into the optical fiber transmission unit. After being split into multiple branch optical paths by a three-level beam splitting topology, the beams are transmitted to the corresponding output nodes. S2. The control module divides adjacent light-emitting nodes into at least one neighbor group according to the physical region, and configures the target light intensity parameters and the light intensity uniformity threshold within each neighbor group. S3. The control module outputs dimming control signals to the light intensity modulation modules in each branch optical path to independently adjust the transmitted light intensity of the corresponding branch optical path. The light intensity acquisition subunit collects light signals from each light-emitting node in real time at a preset frequency. The signals are then converted by photodiodes, conditioned by amplification circuits, and converted to digital signals by a multi-channel ADC before being transmitted to the control module. The control module subtracts the power-on calibrated dark current base and performs sliding filtering to obtain a stable actual output light intensity value for each node. Ambient illuminance sensors in each lighting area synchronously collect ambient illuminance data. Using neighboring groups as units, the target light intensity required by the light source is calculated based on the preset target total illuminance of the working surface and the real-time ambient illuminance. This target light intensity is then compared with the actual output light intensity to obtain the light intensity deviation. Simultaneously, the change in ambient illuminance between the current cycle and the previous cycle is calculated, and a feedforward compensation is generated using a pre-calibrated feedforward coefficient to preemptively offset the impact of sudden changes in natural light on the lighting effect. The total deviation is input to an incremental PID controller to generate the basic increment of the dimming voltage, which is then converted into the actual drive voltage value by a built-in modulator nonlinearity correction table, obtaining the basic dimming parameters for each branch. The average light intensity and maximum relative deviation of each node within the group are calculated. If the deviation exceeds a preset light intensity uniformity threshold, the dimming voltage of each branch is collaboratively corrected with a fixed micro-step size: the attenuation is increased at nodes with high light intensity, and the attenuation is decreased at nodes with low light intensity. After multiple iterations, the relative light intensity deviation within the group stabilizes and meets the preset threshold requirement, and finally a stable dimming control signal is output. The dimming control signal is transmitted in the same direction as the illumination beam in the same optical fiber medium via wavelength division multiplexing, and after decoupling at the corresponding output node, it is loaded onto the corresponding light intensity modulation module.

[0040] S4. Each terminal light output unit will homogenize and diffuse the modulated beam in the corresponding branch optical path to achieve multi-node distributed collaborative dimming.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distributed tunable optical fiber system, characterized in that, It includes a light source module, an optical fiber transmission unit, multiple light intensity modulation modules, a control module, and multiple terminal light output units; The constant beam output by the light source module is coupled into the optical fiber transmission unit, and then split into multiple branch optical paths by the three-level beam splitting topology of the optical fiber transmission unit and transmitted to the corresponding output nodes. Each of the aforementioned light intensity modulation modules is respectively set in the multi-branch optical path, and independently adjusts the transmitted light intensity of the corresponding branch optical path; The control module is signal-connected to each of the light intensity modulation modules, divides adjacent light-emitting nodes into at least one neighbor group according to the physical area, and outputs dimming control signals to the corresponding light intensity modulation modules according to the light intensity uniformity requirements within the group. Each of the terminal light-emitting units is respectively set at the output end of each light-emitting node to homogenize and diffuse the modulated light beam for output.

2. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The light source module includes a visible light source and an optical fiber coupling unit; the wavelength of the output beam of the visible light source covers the visible light band, and the optical fiber coupling unit couples the beam output by the visible light source to the input end of the optical fiber transmission unit.

3. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The three-stage optical splitting topology of the optical fiber transmission unit includes a first-stage optical splitting unit, a second-stage optical splitting branch group, and a third-stage output port group cascaded in sequence. The primary beam splitting unit is a planar optical waveguide beam splitter, used to split the incident beam into at least two redundant transmission optical paths. The secondary beam splitting branch group includes multiple beam splitting branches corresponding to the number of output paths of the primary beam splitting unit. Each beam splitting branch splits a single transmitted beam into multiple parallel branch optical paths. The three-stage output port group includes several directional beam splitting ports, each of which is respectively located at the end of each branch optical path, forming the light output node.

4. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The light intensity modulation module is a Mach-Zehnder interferometer-type electro-optic modulator, located at the end of the corresponding branch optical path and the front end of the three-stage output port group. The electro-optic modulator contains an input branch waveguide, two interferometer arms, and a combiner output terminal. The dimming control signal is applied to the modulation electrode of the interferometer arm, and the refractive index of the interferometer arm waveguide is changed through the electro-optic effect, so that the transmitted beams of the two arms generate a phase difference. After the combiner interference, the output light intensity is continuously and steplessly adjusted.

5. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The control module includes a light intensity acquisition subunit and a collaborative dimming calculation subunit; The light intensity acquisition subunit acquires the actual output light intensity parameters of each light-emitting node and the ambient illuminance parameters of the corresponding lighting area. The collaborative dimming operation subunit generates dimming control signals for each light intensity modulation module based on the deviation between the preset target light intensity and the actual output light intensity, combined with the ambient illuminance compensation amount and the light intensity uniformity constraint within the neighboring group.

6. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The branch optical path of the optical fiber transmission unit uses multimode silica fiber as the transmission medium; the dimming control signal output by the control module is transmitted in the same optical fiber as the illumination beam through wavelength division multiplexing.

7. The fiber-optic-based distributed tunable optical system according to claim 1, characterized in that, The terminal light-emitting unit includes a collimating lens group and a uniform light diffuser. The modulated light beam is collimated and expanded and then output by the uniform light diffuser to form a uniform illumination spot.

8. A distributed tunable optical control method based on optical fiber, characterized in that, The method, based on the system as described in any one of claims 1 to 7, includes the following steps: S1. The light source module outputs a constant beam of light, which is coupled into the optical fiber transmission unit. After being split into multiple branch optical paths by a three-level beam splitting topology, the beams are transmitted to the corresponding output nodes. S2. The control module divides adjacent light-emitting nodes into at least one neighbor group according to the physical region, and configures the target light intensity parameters and the light intensity uniformity threshold within each neighbor group. S3. The control module outputs dimming control signals to the light intensity modulation modules in each branch optical path to independently adjust the transmitted light intensity of the corresponding branch optical path. S4. Each terminal light output unit will homogenize and diffuse the modulated beam in the corresponding branch optical path to achieve multi-node distributed collaborative dimming.

9. The distributed dimmable control method according to claim 8, characterized in that, S3 includes: The system collects the actual output light intensity of each light output node and the ambient illuminance parameters of the corresponding area in real time, calculates the deviation between the actual output light intensity and the target light intensity, and generates a basic dimming signal by combining the ambient illuminance feedforward compensation amount. Then, based on the light intensity uniformity threshold in the neighboring group, the dimming control signals of each light intensity modulation module in the group are coordinated and finely adjusted so that the relative deviation of the light intensity of each light output node in the group meets the preset threshold requirements.

10. The distributed dimmable control method according to claim 8, characterized in that, The dimming control signal is transmitted in the same direction as the illumination beam in the same optical fiber medium via wavelength division multiplexing, and is decoupled at the corresponding light output node and then loaded onto the corresponding light intensity modulation module.

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