Power beam splitter, light source pool, and optical communication system

Abstract

Embodiments of the present application relate to the technical field of optical communication devices, and provide a power beam splitter, a light source pool, and an optical communication system, used for mitigating the problems of having difficulty in coupling a beam splitting element to an optical fiber in a power beam splitter and being prone to failure. The power beam splitter comprises a beam splitting element, a micro-lens array, and a first optical fiber array. The beam splitting element is used for splitting incident light into a plurality of sub-beams. The micro-lens array is disposed on a light-exit side of the beam splitting element, and comprises a plurality of micro-lenses; and the micro-lenses are used for collimating the sub-beams. The first optical fiber array is disposed on a light-exit side of the micro-lens array, and comprises a plurality of first couplers and a plurality of first output optical fibers; and the first couplers are in one-to-one correspondence with the sub-beams emitted from the micro-lenses, and are used for coupling the sub-beams to the first output optical fibers. The power beam splitter can be applied to a light source pool.

Description

A power beam splitter, a light source pool, and an optical communication system

[0001] This application claims priority to Chinese Patent Application No. 202411219376.1, filed with the State Intellectual Property Office of China on August 31, 2024, entitled "A Power Beam Splitter, Light Source Pool and Optical Communication System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical communication device technology, and in particular to a power beam splitter, a light source pool, and an optical communication system. Background Technology

[0003] In some optical communication systems, a light source pool is used to provide laser beams for a large number of optical modules. This eliminates the need for individual lasers in the optical modules, thereby reducing costs and preventing optical module failures due to laser malfunctions. As a result, the failure rate of the optical communication system is significantly reduced.

[0004] A light source pool typically includes a high-power laser and a power beam splitter. The high-power laser is used to generate a high-power laser beam. The laser beam is incident on the power beam splitter, which is used to split the high-power laser beam into multiple lower-power sub-beams. The sub-beams are transmitted to optical modules through optical fibers, so as to achieve the purpose of simultaneously supplying light to multiple optical modules.

[0005] In related technologies, power beam splitters in light source pools typically employ planar lightwave circuits (PLCs) for beam splitting. However, planar lightwave circuits suffer from difficulties in coupling with optical fibers (e.g., input and output fibers) and are prone to failure. Summary of the Invention

[0006] This application provides a power beam splitter, a light source pool, and an optical communication system to improve the problems of difficult coupling and easy failure of the beam splitting element with the optical fiber in the power beam splitter.

[0007] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0008] In a first aspect, embodiments of this application provide a power beam splitter, which includes a beam splitting element, a microlens array, and a first fiber array. The beam splitting element is used to split incident light into multiple sub-beams; the microlens array is disposed on the light-emitting side of the beam splitting element and includes multiple microlenses; the microlenses are used to collimate the sub-beams; the first fiber array is disposed on the light-emitting side of the microlens array and includes multiple first couplers and multiple first output fibers; each first coupler corresponds one-to-one with a sub-beam emitted from the microlens and is used to couple the sub-beam to the first output fiber.

[0009] In the power beam splitter provided in this application embodiment, the sub-beams generated by the beam splitting element are collimated by microlenses in the microlens array, and the collimated sub-beams are then irradiated into the first coupler. When the collimated sub-beams are coupled to the first output fiber by the first coupler, the coupling difficulty is greatly reduced, and high coupling efficiency and quality are achieved, along with good coupling reliability. This allows for long-term operation under high-power conditions. Furthermore, aligning the beam splitting element, the microlens array, and the first fiber array is relatively easy; that is, collimating the sub-beams generated by the beam splitting element through the microlens array and irradiating the collimated sub-beams into the first coupler is relatively straightforward. Therefore, it can be seen that the cooperation of multiple first couplers in the microlens array and the first fiber array reduces the coupling difficulty between the beam splitting element and the first output fiber, achieving high coupling efficiency and quality while maintaining good reliability; and it is applicable to high-power beam splitting scenarios.

[0010] In some embodiments, the power beam splitter further includes a polarization beam splitter disposed on the light-emitting side of the microlens array, for splitting the sub-beam into a first polarized beam and a second polarized beam; the first polarized beam and the second polarized beam have different polarization directions.

[0011] The first fiber array is set on the output side of the first polarized beam in the polarization beam splitter, and the first coupler in the first fiber array corresponds one-to-one with the first polarized beam.

[0012] Due to factors such as fabrication errors in the microlens array, the polarization of the sub-beams can degrade. By setting up a polarization beam splitter, the polarization-degraded portion of the sub-beams can be separated, thereby improving the polarization extinction ratio of the sub-beams.

[0013] In some embodiments, the power beam splitter further includes a second fiber array disposed on the output side of the second polarized beam in the polarization beam splitter; the second fiber array includes a plurality of second couplers and a plurality of second output fibers; the second couplers correspond one-to-one with the second polarized beam and are used to couple the second polarized beam to the second output fiber.

[0014] This design allows for two main advantages. First, it doubles the number of beams split by the power beam splitter, thereby improving its performance. Second, it reduces the requirements for beam splitting components while maintaining the same number of beams, leading to lower costs and higher yield. Third, the first and second fiber arrays transmit linearly polarized light with perpendicular polarization directions, making it suitable for beam splitting scenarios with different polarization requirements.

[0015] In some embodiments, the power beam splitter further includes a diffuser disposed on the output side of the second polarized beam in the polarization beam splitter. This design allows the diffuser to absorb the second polarized beam emitted from the polarization beam splitter, reducing the impact of this portion of the light on the power beam splitter.

[0016] In some embodiments, the power beam splitter further includes an adjustable half-wave plate disposed between the microlens array and the polarization beam splitter, and the optical axis angle is adjustable.

[0017] In the power beam splitter provided in the embodiments of this application, by cooperating with the adjustable half-wave plate and the polarization beam splitter, on the one hand, the polarization extinction ratio of the sub-beams can be further improved; on the other hand, by changing the direction of the optical axis of the adjustable half-wave plate, the ratio of the first polarized beam and the second polarized beam emitted from the polarization beam splitter can be changed.

[0018] In some embodiments, the power beam splitter further includes a polarizer disposed on the output side of the microlens array, and the first fiber array disposed on the output side of the polarizer. By using the polarizer, the polarization-degraded portion of the sub-beam can be blocked, thereby improving the polarization extinction ratio of the sub-beam.

[0019] In some embodiments, the power beam splitter further includes an adjustable half-wave plate disposed between the microlens array and the analyzer, and the optical axis angle is adjustable.

[0020] In the power beam splitter provided in the embodiments of this application, by cooperating with the adjustable half-wave plate and the analyzer, the polarization extinction ratio can be further improved on the one hand; on the other hand, the magnitude of the light emitted from the analyzer can be changed by changing the direction of the optical axis of the adjustable half-wave plate.

[0021] In some embodiments, the beam-splitting element is a diffractive optical element, which is used to split the incident light in one-dimensional or two-dimensional directions. Using a diffractive optical element to split the incident light offers the advantage of flexible and diverse beam-splitting parameters, meeting various beam-splitting requirements, such as achieving one-dimensional or two-dimensional beam splitting. Furthermore, using a diffractive optical element for beam splitting also allows it to withstand high-power incident light, enabling the splitting of incident light exceeding 10W, or even reaching hundreds of watts; thus, it is suitable for high-power beam-splitting scenarios.

[0022] In some embodiments, diffractive optical elements are used to split the incident light into equal proportions. Using diffractive optical elements to split the incident light has the advantage of good beam splitting consistency; by designing the diffractive optical elements to split the beam in equal proportions, scenarios requiring beam splitting consistency can be met.

[0023] In some embodiments, diffractive optical elements are used to split the incident light beam, and the full angle in the beam splitting direction is less than or equal to 120 degrees. This design can achieve good beam splitting consistency while ensuring the number of beams split.

[0024] In some embodiments, the microlens array and the diffractive optical element are integral structures fabricated on the same substrate, or discrete devices fabricated on different substrates.

[0025] When the microlens array and diffractive optical elements are integrated into a single substrate, manufacturing costs can be reduced and long-term reliability improved. When the microlens array and diffractive optical elements are designed as discrete components, high-precision alignment of the diffractive optical elements and the microlens array can be achieved through precise assembly and adjustment. Power beam splitters can select the specific form of the microlens array and diffractive optical elements according to the application scenario.

[0026] In some embodiments, the diffractive optical element and the microlens array are made of the same material. This design can reduce the manufacturing cost of the diffractive optical element and the microlens array, and facilitates the fabrication of the microlens array and the diffractive optical element into a single structure.

[0027] In some embodiments, the diffractive optical element is made of glass, plastic, or fused silica; and / or, the microlens array is made of glass, plastic, or fused silica. Diffractive optical elements and microlens arrays made of the above materials can withstand high-power incident light; for example, when fused silica is used, they can withstand incident light at the hundred-watt level; thus facilitating the use of power beam splitters to achieve high-power beam splitting.

[0028] In some embodiments, the distance between the beam splitter and the microlens array is equal to the focal length of the microlens array, and the first coupler is positioned at the focal length of the microlens array. This design allows the first coupler to be located at the position where the sub-beam waist size is minimized, thereby improving the coupling efficiency between the sub-beam and the output fiber (e.g., the first output fiber).

[0029] In some embodiments, the power beam splitter further includes an input optical fiber and a third coupler, which are disposed on the light-incident side of the diffractive optical element. The input optical fiber is used to transmit incident light, and the third coupler is used to couple the incident light to the diffractive optical element. The power beam splitter provided in this application embodiment can adapt to different incident light incidence methods and has advantages such as good adaptability and flexible design.

[0030] Secondly, embodiments of this application also provide a light source pool, which includes a laser and a power beam splitter as described in the first aspect embodiment, wherein the laser is used to generate incident light; and the power beam splitter is used to receive the incident light and split the incident light into beams.

[0031] In some embodiments, the laser's output power is greater than 10W.

[0032] Thirdly, this application also provides an optical communication system, which includes multiple communication devices and a light source pool as described in the second embodiment of the invention; wherein each communication device is connected to at least one communication device, and each communication device is provided with at least one optical module; the light source pool is used to supply light to the multiple optical modules.

[0033] Fourthly, embodiments of this application also provide a method for transmitting optical signals, the method comprising:

[0034] Acquire the incident light generated by the laser;

[0035] The incident light is split into multiple sub-beams by a beam-splitting element, and the multiple sub-beams are then directed onto a microlens array.

[0036] Multiple sub-beams are collimated by a microlens array and then projected onto a first fiber array; wherein, the first fiber array includes multiple first couplers and multiple first output fibers;

[0037] The sub-beam is coupled into the first output fiber via the first coupler.

[0038] The technical effects achievable by the light source pool, optical communication system, and optical signal transmission method provided in this application embodiment are the same as those achievable by the power beam splitter in any of the above embodiments, and will not be repeated here. Attached Figure Description

[0039] Figure 1 is a network architecture diagram of a data center or computing cluster provided by related technologies;

[0040] Figure 2 is a schematic diagram of a light source cell provided by related technologies;

[0041] Figure 3 is a schematic diagram of a power beam splitter provided by related technologies;

[0042] Figure 4 is a schematic diagram of a power beam splitter provided in an embodiment of this application;

[0043] Figure 5 is a schematic diagram of a one-dimensional proportional beam splitting using a diffractive optical element provided in an embodiment of this application;

[0044] Figure 6 is a schematic diagram of another power beam splitter provided in an embodiment of this application;

[0045] Figure 7 is a structural schematic diagram of another power beam splitter provided in an embodiment of this application;

[0046] Figure 8 is a schematic diagram of the polarization beam splitter in Figure 7;

[0047] Figure 9 is a schematic diagram of another power beam splitter provided in an embodiment of this application;

[0048] Figure 10 is a schematic diagram of another power beam splitter provided in an embodiment of this application;

[0049] Figure 11 is a schematic diagram of another power beam splitter provided in an embodiment of this application. Detailed Implementation

[0050] As shown in Figure 1, an optical communication system 100, such as a data center or computing cluster, includes multiple servers 130 and multiple switches 120. Servers 130 and switches 120, and switches 120 and each other, are interconnected via optical modules 110 and optical fibers. In this type of optical communication system 100, a large number of optical modules 110 are required. For example, a small to medium-sized computing cluster may require tens of thousands of optical modules 110.

[0051] However, using a larger number of optical modules 110 increases the likelihood of interconnection interruptions due to module failure, which can disrupt the normal operation of data centers or computing clusters. In most cases of optical module 110 failure, the cause is a malfunction in the laser within the module. Furthermore, using a larger number of optical modules 110 increases costs.

[0052] To address the aforementioned issues, a light source pool solution is provided in the related technology, as shown in Figure 2. The light source pool 200 includes a laser 210 and a power beam splitter 1. The laser 210 is a high-power laser used to generate a high-power laser beam, which is incident on the power beam splitter 1. The power beam splitter 1 is used to split the high-power laser beam into multiple lower-power sub-beams, which are transmitted to optical modules 110 through optical fibers, thereby achieving the purpose of simultaneously supplying light to multiple optical modules 110.

[0053] By using the light source pool 200, the optical module 110 does not require a separate laser. In this case, on the one hand, the cost can be significantly reduced; on the other hand, the problem of optical module 110 failure due to laser failure can be avoided, improving the long-term reliability of optical module 110, thereby significantly reducing the failure rate of optical communication system 100.

[0054] In related technologies, the power beam splitter 1 in the light source pool 200 typically employs a planar lightwave circuit (PLC) 102 for beam splitting. Figure 3 is a schematic diagram of a power beam splitter 1 provided by related technologies. As shown in Figure 3, the power beam splitter 1 includes a planar lightwave circuit 102, an input fiber 101, and an output fiber 103. The planar lightwave circuit 102 includes an input end face and an output end face. The input fiber 101 is coupled to the input end face of the planar lightwave circuit 102 and is used to input a high-power laser beam into the planar lightwave circuit 102. The output fiber 103 is coupled to the output end face of the planar lightwave circuit 102 and is used to transmit the sub-beams after being split by the planar lightwave circuit 102.

[0055] In the power beam splitter 1 provided by the related technology, the coupling between the planar optical waveguide 102 and the optical fiber (including the input optical fiber 101 and the output optical fiber 103) is the coupling between the waveguide end face and the optical fiber, which presents a problem of high coupling difficulty. Especially in scenarios with high polarization isolation requirements, the input optical fiber 101 and the output optical fiber 103 need to be polarization-maintaining fibers, which further increases the difficulty of coupling alignment between the polarization-maintaining fibers and the end face of the planar optical waveguide 102. In addition, the coupling end face between the planar optical waveguide 102 and the optical fiber (including the input optical fiber 101 and the output optical fiber 103) is prone to damage, especially under high-power operating conditions, resulting in a high failure rate of the planar optical waveguide 102 and affecting the long-term reliability of the power beam splitter 1.

[0056] Based on this, embodiments of this application provide a power beam splitter to improve the above-mentioned problems.

[0057] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0058] In the following embodiments of this application, the terms "first," "second," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] In the embodiments of this application, "upper", "lower", "left" and "right" are not limited to the orientation of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0060] In the embodiments of this application, unless the context otherwise requires, the term "comprising" is interpreted as open and encompassing throughout the specification and claims, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "exemplarily," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this application. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0061] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0062] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0063] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0064] Exemplary embodiments are described in this application with reference to cross-sectional views and / or plan views and / or equivalent circuit diagrams, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0065] This application provides a power beam splitter, as shown in Figure 4. The power beam splitter 1 includes a diffractive optical element (DOE) 2, a microlens array 3, and a first fiber array 4. The diffractive optical element 2 is an optical device that uses the principle of light diffraction to adjust a light beam. It includes a micro / nano structure 21 formed on a substrate. This micro / nano structure 21 includes multiple diffraction units distributed in two dimensions, each with a specific geometry, refractive index, or phase retardation. The micro / nano structure 21 in the diffractive optical element 2 can finely control the wavefront phase distribution of the incident light P0. Therefore, beam shaping, beam splitting, structured light, or multifocal functions can be achieved through the design of the micro / nano structure 21.

[0066] In the power beam splitter 1 provided in this embodiment, the diffractive optical element 2 serves as a beam splitting element to split the incident light P0. Here, the incident light P0 can be a laser beam generated by an external laser, which can directly irradiate the diffractive optical element 2 on its light-receiving side. In some embodiments, the power beam splitter 1 further includes an input optical fiber and a third coupler. Both the input optical fiber and the third coupler are disposed on the light-receiving side of the diffractive optical element 2. The input optical fiber is used to transmit the laser beam generated by the external laser, and the third coupler is connected to the input optical fiber to couple the laser beam in the input optical fiber into the diffractive optical element 2.

[0067] As shown in Figure 5, the diffractive optical element 2 can be used to achieve one-dimensional proportional beam splitting. One-dimensional proportional beam splitting refers to dividing the incident light P0 into N sub-beams P1 along a splitting direction, where N is greater than 2. The N sub-beams P1 after splitting are arranged in the same splitting plane. In a reference plane located on the light-emitting side of the diffractive optical element 2 and parallel to the diffractive optical element 2, the illumination positions of the N sub-beams P1 can form a one-dimensional array arranged in the same straight line. Furthermore, the power of the N sub-beams P1 is equal or substantially equal. One-dimensional proportional beam splitting can also be represented as 1*N beam splitting.

[0068] Please refer to Figure 5. In one-dimensional proportional beam splitting, the angle between two adjacent sub-beams P1 is called the separation angle, which is represented by θ in Figure 5. s In the N sub-beams P1 after beam splitting, the angle between the two outermost sub-beams P1 is called the full angle, which is represented by θ in Figure 5. f express.

[0069] By designing the micro / nano structure 21 in the diffractive optical element 2, the number of beam splitters (N) and the beam splitting angle (θ) can be adjusted. s ), full angle (θ f The power ratio between the N sub-beams P1 and each sub-beam P1 is such that the N sub-beams P1 after beam splitting can be separated at the same separation angle (θ). s The beams emerge from the diffractive optical element 2, and the power of the N sub-beams P1 is equal.

[0070] In some embodiments, when the diffractive optical element 2 splits the beam in a one-dimensional proportional manner, its full angle θ in the beam splitting direction... f The angle should not exceed 120 degrees; for example, it can be 110 degrees, 100 degrees, 90 degrees, 80 degrees, 60 degrees, 45 degrees, 30 degrees, and 20 degrees. Because an excessively large full angle will lead to significant power differences between different sub-beams P1, it is difficult to ensure beam splitting consistency. When using a design with a full angle less than 120 degrees, better beam splitting consistency can be achieved while maintaining the number of beams.

[0071] In some embodiments, when the diffractive optical element 2 splits the beam in one dimension at equal proportions, the number of beams is greater than 2 and less than or equal to 20; such a design can achieve better beam splitting consistency.

[0072] Furthermore, when the number of beams is odd, the zeroth-order diffracted light is activated; when the number of beams is even, the zeroth-order diffracted light is suppressed. Since it is difficult to make the power of the zeroth-order diffracted light consistent with the power of other orders of diffracted light, suppressing the zeroth-order diffracted light helps to improve the consistency of beam splitting.

[0073] The diffractive optical element 2 can also be used to achieve two-dimensional proportional beam splitting. Two-dimensional proportional beam splitting refers to dividing the incident light P0 into M*N sub-beams P1 along two different splitting directions, where M and N are both greater than 2, and M and N can be equal or unequal. The M*N sub-beams P1 after splitting are arranged in different splitting planes. In a reference plane located on the light-emitting side of the diffractive optical element 2 and parallel to the diffractive optical element 2, the illumination positions of the M*N sub-beams P1 can form a two-dimensional array of M rows and N columns. Furthermore, the power of the M and N sub-beams P1 is equal or substantially equal. Two-dimensional proportional beam splitting can be represented as M*N beam splitting.

[0074] In two-dimensional proportional beam splitting, the beam splitting state can be described by the separation angle, full angle, number of beams, and power ratio between each sub-beam P1 in each beam splitting direction. For the separation angle and full angle, please refer to the description of one-dimensional proportional beam splitting.

[0075] By designing the micro-nano structure 21 in the diffractive optical element 2, the beam splitting state of the two-dimensional equal-proportion beam splitting can be adjusted, so that the M*N sub-beams P1 after beam splitting can exit from the diffractive optical element 2 at the same separation angle in both beam splitting directions, and the power of the M*N sub-beams P1 is equal.

[0076] In some embodiments, when the diffractive optical element 2 performs two-dimensional proportional beam splitting, its full angle in any beam splitting direction does not exceed 120 degrees, for example, it can be 110 degrees, 100 degrees, 90 degrees, 80 degrees, 60 degrees, 45 degrees, 30 degrees, and 20 degrees. Because an excessively large full angle leads to significant power differences between different sub-beams P1, it is difficult to ensure beam splitting consistency. When using a design with a full angle less than 120 degrees, better beam splitting consistency can be achieved while maintaining the number of beams.

[0077] In some embodiments, when the diffractive optical element 2 is split into two equal proportions in two dimensions, the number of beams split in any beam splitting direction is greater than 2 and less than or equal to 20; such a design can achieve better beam splitting consistency.

[0078] Furthermore, when the number of beams in a beam-splitting direction is odd, the zero-order diffracted light is activated; when the number of beams in a beam-splitting direction is even, the zero-order diffracted light is suppressed. Since it is difficult to make the power of the zero-order diffracted light consistent with the power of other orders of diffracted light, suppressing the zero-order diffracted light helps to improve the consistency of beam splitting.

[0079] In some embodiments, the diffractive optical element 2 can be used to achieve one-dimensional or two-dimensional beam splitting. The power of each sub-beam P1 after beam splitting can be designed to be unequal. For example, in each sub-beam after beam splitting, the power of each sub-beam gradually increases from the center position to the edge position. Or, in each sub-beam after beam splitting, the power of the sub-beam located at the outer edge position is much greater than the power of the sub-beam located at other positions, and so on. This satisfies the beam splitting requirements of different application scenarios.

[0080] The micro / nano structure 21 in the diffractive optical element 2 can be formed on a substrate using micro / nano fabrication techniques, such as etching, nanoimprinting, molding, or laser direct writing. The substrate material can be glass, plastic, or fused silica. By using a substrate made of the aforementioned materials to fabricate the diffractive optical element 2, the material of the diffractive optical element 2 can be the corresponding glass, plastic, or fused silica. This design allows the diffractive optical element 2 to have a high damage threshold, capable of withstanding high-power incident light P0 of over 10W, thus achieving high-power beam splitting.

[0081] In some embodiments, the substrate used to fabricate the diffractive optical element 2 is a fused silica substrate, that is, the material of the diffractive optical element 2 is fused silica. This design allows the diffractive optical element 2 to withstand incident light P0 at the level of hundreds of watts, achieving the purpose of high-power beam splitting.

[0082] The power beam splitter 1 provided in this application uses diffractive optical elements 2 for beam splitting, which has advantages such as good beam splitting consistency, flexible and diverse beam splitting parameters, and the ability to achieve high-power (e.g., 10W or more) beam splitting.

[0083] Referring to Figure 4, the microlens array 3 is positioned on the light-emitting side of the diffractive optical element 2. Multiple sub-beams P1, after being split by the diffractive optical element 2, illuminate the microlens array 3. The microlens array 3 includes multiple microlenses 31 arranged in an array, the arrangement of which matches the distribution of the sub-beams P1 emitted from the diffractive optical element 2. In other words, the microlens array 3 includes the same number of microlenses 31 as the number of sub-beams P1 emitted from the diffractive optical element 2. Each microlens 31 has a one-to-one correspondence with a sub-beam P1, and each microlens 31 is positioned at the illumination position of its corresponding sub-beam P1 when it reaches the location of the microlens array 3, ensuring that each sub-beam P1 can illuminate one microlens 31 within the microlens array 3. For example, in a one-dimensional proportional beam splitting scenario, the microlens array 3 includes N microlenses 31 corresponding to N sub-beams P1. The N microlenses 31 are arranged in a one-dimensional array in the same direction as the beam splitting direction, and the positions of the N microlenses 31 are the same as the illumination positions of the N sub-beams P1 when they are transmitted to the position of the microlens array 3.

[0084] For example, in a two-dimensional proportional beam splitting scenario, the microlens array 3 includes M*N microlenses 31 corresponding to M*N sub-beams P1. The M*N microlenses 31 are arranged in a two-dimensional array along the two beam splitting directions, and the positions of the M*N microlenses 31 are the same as the illumination positions of the M*N sub-beams P1 when they are transmitted to the position of the microlens array 3.

[0085] In some embodiments, the microlens array 3 includes P*Q microlenses 31 arranged in a two-dimensional array, where P is greater than M and Q is greater than M; however, the microlens array 3 includes N microlenses 31 corresponding to N sub-beams P1 in a one-dimensional proportional beam splitting scenario, and also includes M*N microlenses 31 corresponding to M*N sub-beams P1 in a two-dimensional proportional beam splitting scenario. This design allows for adaptation to different application scenarios using a single microlens array 3.

[0086] In the microlens array 3, the microlenses 31 are used to collimate the incident sub-beam P1, and the focal lengths of the microlenses 31 on the same microlens array 3 are equal. The focal length of each microlens 31 on the microlens array 3 can be represented by the focal length of the microlens array 3. The focal length of the microlens array 3 is represented by F in Figure 4. The size of the focal length F can be from 1 mm to 100 mm; for example, it can be 10 mm, 20 mm, 30 mm, 50 mm, 60 mm, 80 mm, 90 mm and 95 mm, etc.

[0087] In some embodiments, the distance between the diffractive optical element 2 and the microlens array 3 (denoted by d in FIG4) is equal to the focal length of the microlens array 3.

[0088] The microlens array 3 can be formed by processing the substrate using techniques such as etching, nanoimprinting, molding, or laser direct writing. The substrate can be a glass substrate, a plastic substrate, or a fused silica substrate, etc., and the substrate material is the same as the material of the microlens array 3. Using the above-mentioned materials to fabricate the microlens array 3 can give the microlens array 3 a high damage threshold, enabling it to withstand high-power incident light P0 of over 10W, which is beneficial for the power beam splitter 1 to achieve the purpose of high-power beam splitting.

[0089] In some embodiments, the substrate used to fabricate the microlens array 3 is a fused silica substrate, that is, the material of the microlens array 3 is fused silica. This design can withstand incident light P0 at the level of hundreds of watts, which is beneficial for the power beam splitter 1 to achieve the purpose of high-power beam splitting.

[0090] In the power beam splitter 1 provided in this application embodiment, the substrate materials used to fabricate the microlens array 3 and the diffractive optical element 2 can be the same or different. When the substrate materials are different, the microlens array 3 and the diffractive optical element 2 are discrete devices fabricated on different substrates. When the substrate materials are the same, the microlens array 3 and the diffractive optical element 2 can be either discrete devices fabricated on different substrates (as shown in Figure 4) or an integral structure fabricated on the same substrate (as shown in Figure 6).

[0091] As shown in Figure 6, the microlens array 3 and the diffractive optical element 2 are fabricated as an integrated structure on the same substrate. This means that the micro / nano structure 21 in the diffractive optical element 2 and the microlens 31 in the microlens array 3 are respectively fabricated on opposite surfaces of the same substrate. During operation, the multiple sub-beams P1 after beam splitting by the diffractive optical element 2 are transmitted to the microlens array 3 in the substrate. The integrated design of the microlens array 3 and the diffractive optical element 2 can reduce manufacturing costs and improve long-term reliability.

[0092] When the microlens array 3 and the diffractive optical element 2 are designed as discrete components, high-precision alignment of the diffractive optical element 2 and the microlens array 3 can be achieved through precise assembly and adjustment. The specific form of the microlens array 3 and the diffractive optical element 2 can be selected according to the application scenario.

[0093] Referring to Figure 4, in the power beam splitter 1 provided in this embodiment, a first fiber array 4 is disposed on the light-emitting side of the microlens array 3, including multiple first couplers 41 and multiple first output fibers 42. The number and position of the first couplers 41 match the multiple sub-beams P1 emitted from the microlens array 3. That is, the first fiber array 4 has the same number of first couplers 41 as the sub-beams P1, and there is a one-to-one correspondence between the first couplers 41 and the sub-beams P1. Each first coupler 41 is positioned at the illumination position of the corresponding sub-beam P1 when it is transmitted to the location of the first fiber array 4, so that each sub-beam P1 emitted from the microlens array 3 can be incident on a corresponding first coupler 41. The number of first couplers 41 and the number of first output fibers 42 are the same. One first output fiber 42 is connected to one first coupler 41, and the first coupler 41 couples the incident sub-beam P1 into the connected fiber for transmission. The first coupler 41 can be a collimator or a coupling lens, etc.

[0094] In the power beam splitter 1 provided in this application embodiment, by setting the microlens array 3, the sub-beam P1 after being split by the diffractive optical element 2 can be collimated, which is more conducive to coupling the sub-beam P1 to the first output fiber 42 through the first coupler 41, and at the same time, it is conducive to ensuring the consistency of the sub-beam P1 coupled to different first output fibers 42.

[0095] In some embodiments, the first fiber array 4 is positioned at the focal length of the microlens array 3. This design places the first coupler 41 at the position where the waist size of the sub-beam P1 emitted from the microlens 31 is minimized, thereby improving the coupling efficiency of the sub-beam P1 when it is coupled into the first coupler 41.

[0096] In the power beam splitter 1 provided in this application embodiment, since the diffractive optical element 2 has polarization dependence, the incident light P0 is required to be polarized light. When the polarized light is coupled to the first output fiber 42 through the diffractive optical element 2, the microlens array 3 and the first coupler 41, it is still polarized light. Therefore, the first output fiber 42 in the first fiber array 4 is generally selected as a polarization-maintaining fiber. When the polarization isolation requirement is not high, for example, when transmitting over short distances at the level of a few meters, the first output fiber 42 can be a non-polarized fiber.

[0097] This application also provides another power beam splitter 1, which can be applied to scenarios where the incident light P0 is linearly polarized and high polarization isolation is required.

[0098] As shown in Figure 7, the power beam splitter 1 includes a diffractive optical element 2, a microlens array 3, a polarization beam splitter 6, and a first fiber array 4. The diffractive optical element 2 is used to proportionally split the incident light P0 into multiple sub-beams P1. The incident light P0 is first-polarized light, which can be P-polarized or S-polarized. The sub-beams P1 after being split by the diffractive optical element 2 are also first-polarized light. The multiple sub-beams P1 emitted from the diffractive optical element 2 illuminate the microlens array 3. The microlenses 31 in the microlens array 3 are used to collimate the sub-beams P1. The collimation of the sub-beams P1 does not affect their polarization state; that is, the sub-beams P1 emitted from the microlens array 3 should still be first-polarized light. However, due to factors such as the processing error of the microlens array 3, the polarization of the sub-beam P1 will be degraded, causing the sub-beam P1 to be converted into elliptically polarized light. This elliptically polarized light includes a large proportion of first polarized light and a small proportion of second polarized light, wherein the polarization direction of the second polarized light is perpendicular to the polarization direction of the first polarized light; when the first polarized light is P-polarized light, the second polarized light is S-polarized light; when the first polarized light is S-polarized light, the second polarized light is P-polarized light.

[0099] Further descriptions of the diffractive optical element 2 and the microlens array 3 can be found above and will not be repeated here.

[0100] The sub-beam P1 emitted from the microlens array 3 illuminates the polarization beam splitter 6. The polarization beam splitter 6 is an optical device that splits the incident beam according to the polarization direction, and can transmit S-polarized light and P-polarized light incident at the same position to different positions respectively. The polarization beam splitter 6 can be a prism-type or a flat-plate polarization beam splitter.

[0101] Taking the prism-type polarizing beam splitter 6 as an example, as shown in Figure 8, the polarizing beam splitter 6 is a square prism formed by combining two right-angle prisms. Its outer surface includes four end faces, namely the first end face S1, the second end face S2, the third end face S3, and the fourth end face S4. The first end face S1 and the second end face S2 are arranged opposite to each other in the first direction and are both perpendicular to the first direction. The third end face S3 and the fourth end face S4 are arranged opposite to each other in the second direction and are both perpendicular to the second direction. The second direction and the first direction can be perpendicular to each other.

[0102] The polarization beam splitter 6 also has an internal beam-splitting surface S0, which is inclined relative to both the first and second directions. A first end face S1 and a second end face S2 are located on opposite sides of the beam-splitting surface S0, while the first end face S1 and a third end face S3 are located on the same side of the beam-splitting surface S0. A fourth end face S4 and a second end face S2 are located on the other side of the beam-splitting surface S0. A polarization beam-splitting film is disposed on the beam-splitting surface S0, which can reflect S-polarized light and transmit P-polarized light. When an incident beam containing S-polarized light (represented by a dot symbol in Figure 8) and P-polarized light (represented by a short vertical line symbol in Figure 8) illuminates the beam-splitting surface S0 through the first end face S1, the S-polarized light reflected by the polarization beam-splitting film on the beam-splitting surface S0 exits from the third end face S3, and the P-polarized light transmitted by the polarization beam-splitting film on the beam-splitting surface S0 exits from the second end face S2, thereby achieving the function of polarization beam splitting.

[0103] It can be seen that the polarization beam splitter 6 includes a transmission optical path that can transmit P-polarized light and a reflection optical path that can reflect S-polarized light; the first end face S1 and the second end face S2 are the input and output ends of the transmission optical path, respectively, and the first end face S1 and the third end face S3 are the input and output ends of the reflection optical path, respectively.

[0104] As described above, the first polarized light can be either P-polarized or S-polarized. After the first polarized light passes through the first end face S0 incident polarization beam splitter 6, it can be transmitted through either a transmission path or a reflection path depending on its polarization direction. The polarization direction of the second polarized light is perpendicular to that of the first polarized light. After the second polarized light passes through the first end face S0 incident polarization beam splitter 6, it can also be transmitted through either a transmission path or a reflection path depending on its polarization direction.

[0105] For ease of description, the optical paths used to transmit the first polarized light and the second polarized light in the polarization beam splitter 6 are referred to as the first optical path and the second optical path, respectively. The first optical path and the second optical path can be the transmission optical path and the reflection optical path, or the transmission optical path and the reflection optical path, respectively. The input ends of the first optical path and the second optical path are the same, both being the first end face S1; the output ends of the first optical path and the second optical path are the first polarized light output end and the second polarized light output end, respectively. The first input end and the second polarized light output end can be the second end face S2 and the third end face S3, or the third end face S3 and the second end face S2, respectively.

[0106] In the power beam splitter 1 provided in this embodiment, the microlens array 3 is disposed opposite to the first end face S1 of the polarization beam splitter 6. Multiple sub-beams P1 emitted from the microlens array 3 are incident into the polarization beam splitter 6 through the first end face S1. As described above, the sub-beams P1 emitted from the microlens array 3 may be first-polarized light or elliptically polarized light. When the sub-beam P1 is first-polarized light, it is transmitted through the first optical path in the polarization beam splitter 6 and then emitted from the first-polarized light output end. When the sub-beam P1 is elliptically polarized light, a larger proportion of the first-polarized light will be transmitted through the first optical path in the polarization beam splitter 6 and then emitted from the first-polarized light output end; a smaller proportion of the second-polarized light will be transmitted through the second optical path in the polarization beam splitter 6 and then emitted from the second-polarized light output end.

[0107] It can be seen that by setting the polarization beam splitter 6, the polarization degradation part of the sub-beam P1 caused by the microlens array 3 can be separated, thereby improving the polarization extinction ratio of the sub-beam P1.

[0108] For ease of description, in this paper, each sub-beam P1 emitted from the microlens array 3, after passing through the polarization beam splitter 6, is referred to as the first polarized beam, and the beam emitted from the second polarization beam output end is referred to as the second polarized beam.

[0109] The first fiber array 4 is positioned on the output side of the first polarized beam in the polarization beam splitter 6, that is, outside the first polarized light output end, and is used to receive the first polarized beam emitted from the first polarized light output end. The first coupler 41 in the first fiber array 4 couples the first polarized beam to the corresponding first output fiber 42, and the polarization direction of the first polarized beam is the same as that of the incident light P0.

[0110] For example, as shown in Figure 8, the incident light P0 is P-polarized light, the first optical path is the transmission optical path of the polarization beam splitter 6, and the output end of the first polarized light is the second end face S2 in the polarization beam splitter 6. The first fiber array 4 is disposed outside the second end face S2 in the polarization beam splitter 6. The first polarized beam coupled into the first fiber array 4 is P-polarized light.

[0111] In some embodiments, a half-wave plate (HWP) 5 is further disposed between the polarization beam splitter 6 and the microlens array 3. The half-wave plate 5 can generate a phase delay of π on the passing sub-beam P1, thereby rotating the polarization direction of the linearly polarized light. Through the cooperation of the half-wave plate 5 and the polarization beam splitter 6, the polarization extinction ratio of the sub-beam P1 can be further improved.

[0112] This application also provides another power beam splitter 1, as shown in FIG9. The difference between this power beam splitter 1 and the one shown in FIG7 is that it further includes a scattering plate 7. The scattering plate 7 is disposed on the light-emitting side of the second polarized beam in the polarization beam splitter 6, that is, outside the output end of the second polarized light, and is used to receive and absorb the second polarized beam emitted from the output end of the second polarized light. The scattering plate 7 can be a frosted glass structure or a coated structure, with an absorption rate of 50% to 100% for the second polarized beam. By absorbing the second polarized beam, the influence of stray light on the power beam splitter 1 can be avoided.

[0113] This application also provides another power beam splitter 1, as shown in FIG10. The difference between this power beam splitter 1 and the power beam splitter 1 shown in FIG7 is that it further includes a second fiber array 8. The second fiber array 8 is disposed on the output side of the second polarized beam in the polarization beam splitter 6, that is, outside the output end of the second polarized light. The second fiber array 8 includes multiple second couplers and multiple second output fibers. For a description of the second fiber array 8, please refer to the description of the first fiber array 4.

[0114] The second coupler is used to receive the second polarized beam emitted from the second polarized light output end and couple the second polarized beam to the corresponding second fiber array 8.

[0115] As described above, the second polarized beam transmitted in the second fiber array 8 is second polarized light, while the second polarized beam transmitted in the first fiber array 4 is first polarized light. This design doubles the number of beams split by the power beam splitter 1, thus improving its performance. This design also reduces the requirements for the diffractive optical element 2, thereby lowering costs and improving yield. Furthermore, since the first fiber array 4 and the second fiber array 8 transmit linearly polarized light with perpendicular polarization directions, they can be adapted to beam splitting scenarios with different polarization requirements.

[0116] In the power beam splitter 1 with half-wave plate 5 described above, half-wave plate 5 is replaced with an adjustable half-wave plate. An adjustable half-wave plate refers to a half-wave plate 5 whose optical axis is adjustable. The optical axis adjustment can be achieved mechanically by rotating half-wave plate 5 or electrically by applying different voltages. By adjusting the optical axis, the polarization direction of the linearly polarized light can be adjusted, thereby controlling the power ratio of the sub-beam P1 output from the first polarized light output end and the second polarized light output end when passing through the polarization beam splitter 6, thus achieving the purpose of adjusting the power of the output second polarized beam and the second polarized beam.

[0117] This application also provides another power beam splitter 1, as shown in Figure 11. The difference between this power beam splitter 1 and the one shown in Figure 7 is that a polarizer 9 replaces the polarization beam splitter 6, and the transmission direction of the polarizer 9 is the same as the polarization direction of the first polarized light. The polarizer 9 can block the polarization degradation portion of the sub-beam P1 caused by the microlens array 3, thereby improving the polarization extinction ratio of the sub-beam P1. In this embodiment, the polarization effect ratio can also be further improved by setting a half-wave plate 5. The power value of the output sub-beam P1 can also be adjusted by setting an adjustable half-wave plate.

[0118] In the power beam splitter 1 provided in the above embodiments, the diffractive optical element 2 is used as a beam splitting element to split the incident light P0. However, the embodiments of this application are not limited to this. For example, in some embodiments, the beam splitting element in the power beam splitter 1 can also be other components capable of beam splitting, such as gratings, planar waveguides, and spatial light modulators. When the beam splitting element adopts the above-mentioned components, the position of the diffractive optical element 2 in the above embodiments can be referenced. The power beam splitter 1 using the above-mentioned beam splitting element can also reduce the difficulty of coupling with optical fibers, improve reliability, and achieve the effect of high-power beam splitting.

[0119] The power beam splitter 1 provided in this application embodiment can be applied in devices such as light source pools and laser processing equipment to realize the function of laser beam splitting, and can adapt to application scenarios with high power and a large number of beams.

[0120] This application also provides a light source pool, which can also be called a centralized light supply device. The light source pool includes a laser and the power beam splitter 1 described in the above embodiments. The laser can be a high-power laser with an output power exceeding 10W, used to generate a high-power laser beam. The high-power laser beam is incident on the power beam splitter 1, which divides the high-power laser beam into multiple smaller-power sub-beams. These sub-beams are then transmitted to multiple optical modules via optical fibers, achieving the purpose of simultaneously supplying light to multiple optical modules.

[0121] In the light source pool provided in the embodiments of this application, two or more lasers can be provided, and two or more power beam splitters 1 can also be provided.

[0122] In some embodiments, the light source pool further includes an amplifier disposed between the laser and the power beam splitter 1, which amplifies the laser beam generated by the laser and then transmits the amplified laser beam to the power beam splitter 1.

[0123] In some other embodiments, the laser in the light source pool has a built-in amplifier, that is, the laser includes a seed source and an amplifier. The seed source is used to generate a seed laser beam, and the amplifier is used to amplify the seed laser beam and output it. The output laser beam is transmitted to the power beam splitter 1.

[0124] This application also provides an optical communication system, which includes multiple communication devices and a power beam splitter as described in the above embodiments. The communication devices can be different products depending on the application scenario. For example, in the scenario shown in Figure 1, the communication devices can be switches and servers.

[0125] In an optical communication system, each communication device is connected to at least one other communication device, and each communication device is equipped with at least one optical module. The optical module is used to convert optical signals into electrical signals; optical communication between the communication devices can be achieved through the optical module. The light source pool is connected to multiple optical modules in the optical communication system to supply light to the optical modules.

[0126] This application also provides a method for transmitting optical signals, the method comprising:

[0127] Acquire the incident light generated by the laser;

[0128] The incident light is split into multiple sub-beams by a beam-splitting element, and the multiple sub-beams are then directed onto a microlens array.

[0129] Multiple sub-beams are collimated by a microlens array and then projected onto a first fiber array; wherein, the first fiber array includes multiple first couplers and multiple first output fibers;

[0130] The sub-beam is coupled into the first output fiber via the first coupler.

[0131] The above transmission method can be implemented using the power beam splitter provided in the embodiments of this application.

[0132] The technical effects achievable by the light source pool, optical communication system, and optical signal transmission method provided in this application embodiment are the same as those achievable by the power beam splitter in any of the above embodiments, and will not be repeated here.

[0133] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

A power beam splitter, characterized in that, The power beam splitter includes: A beam splitter element is used to split the incident light into multiple sub-beams; A microlens array, disposed on the light-emitting side of the beam-splitting element, includes multiple microlenses; the microlenses are used to collimate the sub-beams; and A first fiber array is disposed on the light-emitting side of the microlens array, including multiple first couplers and multiple first output fibers; each first coupler corresponds to a sub-beam emitted from the microlens and is used to couple the sub-beam to the first output fiber. The power beam splitter according to claim 1 is characterized in that, The power beam splitter also includes a polarization beam splitter, which is disposed on the light-emitting side of the microlens array and is used to split the sub-beam into a first polarized beam and a second polarized beam; the first polarized beam and the second polarized beam have different polarization directions. The first fiber array is disposed on the output side of the first polarized beam in the polarization beam splitter, and the first coupler in the first fiber array corresponds one-to-one with the first polarized beam. The power beam splitter according to claim 2 is characterized in that, The power beam splitter further includes a second fiber array, which is disposed on the output side of the second polarized beam in the polarization beam splitter. The second fiber array includes multiple second couplers and multiple second output fibers; each second coupler corresponds to a second polarized beam and is used to couple the second polarized beam into the second output fiber. The power beam splitter according to claim 2 is characterized in that, The power beam splitter also includes a scattering plate, which is disposed on the output side of the second polarized beam in the polarization beam splitter. The power beam splitter according to any one of claims 2 to 4 is characterized in that, The power beam splitter also includes an adjustable half-wave plate, which is disposed between the microlens array and the polarization beam splitter, and the optical axis angle is adjustable. The power beam splitter according to claim 1 is characterized in that, The power beam splitter also includes a polarizer, which is disposed on the light-emitting side of the microlens array, and the first fiber array is disposed on the light-emitting side of the polarizer. The power beam splitter according to claim 6 is characterized in that, The power beam splitter also includes an adjustable half-wave plate, which is disposed between the microlens array and the analyzer, and the optical axis angle is adjustable. The power beam splitter according to any one of claims 1 to 7 is characterized in that, The beam splitting element is a diffractive optical element, which is used to split the incident light in one dimension or two dimensions. The power beam splitter according to claim 8 is characterized in that, The diffractive optical element is used to split the incident light into equal proportions. The power beam splitter according to claim 8 or 9 is characterized in that, The diffractive optical element is used to split the incident light into beams, and the full angle in the beam splitting direction is less than or equal to 120 degrees. The power beam splitter according to any one of claims 8 to 10 is characterized in that, The microlens array and the diffractive optical element are either an integral structure fabricated on the same substrate, or discrete devices fabricated on different substrates. The power beam splitter according to claim 11 is characterized in that, The diffractive optical element and the microlens array are made of the same material. The power beam splitter according to claim 11 or 12 is characterized in that, The material of the diffractive optical element is glass, plastic, or fused silica; And / or, the material of the microlens array is glass, plastic or fused silica. The power beam splitter according to any one of claims 1 to 13 is characterized in that, The distance between the beam splitter and the microlens array is equal to the focal length of the microlens array, and the first coupler is located at the focal length of the microlens array. The power beam splitter according to any one of claims 1 to 14 is characterized in that, The power beam splitter also includes an input optical fiber and a third coupler, which are disposed on the light-incoming side of the diffractive optical element. The input optical fiber is used to transmit the incident light, and the third coupler is used to couple the incident light to the diffractive optical element. A light source cell, characterized in that, The light source pool includes: A laser, said laser being used to generate incident light; and The power beam splitter according to any one of claims 1 to 15, wherein the power beam splitter is used to receive the incident light and split the incident light into beams. The light source cell according to claim 16 is characterized in that, The laser has an output power greater than 10W. An optical communication system, characterized in that, The optical communication system includes: Multiple communication devices, each of which is connected to at least one other communication device, and each of which is equipped with at least one optical module; and The light source pool as described in claim 16 or 17 is used to supply light to the plurality of said optical modules.

Images