A method of connecting optical fiber coupling structures

Abstract

The application provides a connection method of an optical fiber coupling structure, comprising the following steps: connecting a first photoelectric conversion device with a coupling member; connecting one end of an optical fiber with a coupling output end and connecting the other end of the optical fiber with a test light source; adjusting the connection position of the optical fiber and the coupling output end, fixing the optical fiber at the current first connection position when the electric signal strength output by the first photoelectric detection device reaches the maximum value; separating the optical fiber from the test light source; connecting the end of the optical fiber far away from the coupling output end with a second photoelectric conversion device; optically connecting a light source assembly with a coupling input end by emitting an operating light signal; adjusting the connection position of the light source assembly and the coupling input end, fixing the light source assembly at the current second connection position when the electric signal output by the second photoelectric conversion device reaches the maximum value, and completing the connection of the optical fiber coupling structure. The application simplifies the coupling process and realizes fast coupling.

Description

Technical Field

[0001] This invention belongs to the field of optical communication technology, and specifically relates to a connection method for an optical fiber coupling structure. Background Technology

[0002] Optical modulation technology is a modulation technique that superimposes information-carrying signals onto carrier light waves. It can cause certain parameters of certain light waves, such as amplitude, frequency, phase, polarization state, and duration, to change according to certain rules. Optical modulation technology is widely used in optical communication, optical storage, and display.

[0003] The modulator is used for light intensity modulation. Its two ends are connected to a laser source and an optical fiber, respectively, so that the light beam emitted by the laser source is modulated and enters the optical fiber, allowing the laser carrying information to enter the optical fiber. The modulation connection line includes a laser source, a condenser lens, an optical isolator, a modulator, and an optical fiber connected in sequence. The laser propagation process in it is as follows: the laser source emits laser light, the laser light is focused by the condenser lens and its direction is controlled by the optical isolator, and then enters the modulator from the input end of the modulator. The optical fiber is installed at the output end of the modulator. After the laser light is modulated by the electrodes in the modulator, it enters the optical fiber from the output end of the modulator.

[0004] Because optical fibers have very small diameters (8μm-10μm for single-mode fibers), lasers with excessively large incident angles will be refracted by the cladding surrounding the fiber. Only lasers entering the fiber at a specific incident angle can propagate within it. Therefore, precise coupling between the laser source and the modulator's input, and between the optical fiber and the modulator's output, is necessary to control the laser's propagation angle and ensure accurate entry into the fiber. The traditional method involves first mounting the modulator, connecting its electrodes to external equipment such as an optical fiber, then installing the laser source, optical isolator, and modulator at pre-designed heights. A focusing lens is then placed between the laser source and the optical isolator. By rotating and adjusting the focusing lens, the laser direction is adjusted. The optical fiber is connected to an optical power meter, which detects real-time optical power, thus achieving the effect of adjusting the laser's incident angle through the focusing lens to ensure it enters the fiber at a specific angle.

[0005] In this connection method, since the laser source and modulator need to be pre-mounted and fixed, and the adjustable laser angle using the focusing lens is limited, the allowable installation error of each device is very small. During the coupling process between the laser source and the input end of the modulator, the installation position of the laser source is prone to an error of more than 10μm. During the coupling process between the output end of the modulator and the single-mode fiber, the mode field of the single-mode fiber needs to match the mode field of the output end. The mode field diameter of the single-mode fiber is about 9.2μm, and the mode field diameter of the output end of the modulator is about 6μm. Once the radial offset of the coupling connection position between the single-mode fiber and the modulator exceeds 2μm, the coupling efficiency will approach 0, the laser incident angle will be incorrect, and the laser will not be able to enter the fiber from the input end of the modulator for propagation. Since the coupling connection positions of the laser source and the single-mode fiber to the modulator are fixed, that is, the positions of laser – electrode in modulator – single-mode fiber are fixed, in order to ensure that the laser source and the input end of the modulator, and the fiber and the output end of the modulator achieve the coupling effect, it is necessary to adjust the incident angle of the laser entering the fiber by adjusting the focusing lens. However, the error formed during the mounting process of each component is large, the adjustment range of the focusing lens is limited, the probability of the fiber and the output end of the modulator being correctly coupled is very low, and a lot of time and effort are required for debugging, making the coupling extremely difficult and inefficient. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a connection method for an optical fiber coupling structure that simplifies the coupling process and improves coupling efficiency.

[0007] This invention is achieved through the following technical solution: This invention provides a connection method for an optical fiber coupling structure, the optical fiber coupling structure including a first photoelectric conversion device, a second photoelectric conversion device, and a light source assembly, a modulator, and an optical fiber connected in sequence; the modulator includes a coupling input end, a coupling element, and a coupling output end connected in sequence; the connection method of the optical fiber coupling structure includes the following steps: the first photoelectric conversion device is connected to the coupling element; one end of the optical fiber is connected to the coupling output end, and the other end of the optical fiber is connected to a test light source, the photoelectric conversion device is connected to the coupling element, the optical signal emitted by the test light source is transmitted sequentially in the optical fiber, the coupling output end, the coupling element, and the first photoelectric conversion device, the first photoelectric conversion device receives the test optical signal and converts it into an electrical signal; the optical fiber and the coupling element are adjusted... The connection position of the coupling output end is described. When the electrical signal strength output by the first photoelectric conversion device reaches its maximum value, the optical fiber is fixed at the current first connection position. The optical fiber is then separated from the test light source. The end of the optical fiber furthest from the coupling output end is connected to the second photoelectric conversion device. The light source assembly is optically connected to the coupling input end by emitting a working optical signal. The emitted working optical signal is transmitted through the coupling input end, the coupling element, the coupling output end, the optical fiber, and the second photoelectric conversion device. The second photoelectric conversion device receives the working optical signal and converts it into an electrical signal. The connection position of the light source assembly and the coupling input end is adjusted. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, the light source assembly is fixed at the current second connection position, completing the connection of the optical fiber coupling structure.

[0008] This invention provides a connection method for an optical fiber coupling structure, wherein a first photoelectric conversion device is connected to a coupling element; one end of the optical fiber is connected to the coupling output end, and the other end of the optical fiber is connected to a test light source; the photoelectric conversion device is connected to the coupling element; the optical signal emitted by the test light source is transmitted sequentially through the optical fiber, the coupling output end, the coupling element, and the first photoelectric conversion device; the first photoelectric conversion device receives the test optical signal and converts it into an electrical signal; the connection position of the optical fiber and the coupling output end is adjusted; when the electrical signal strength output by the first photoelectric conversion device reaches its maximum value, the optical fiber is fixed at the current first connection position; the optical fiber is separated from the test light source; and the optical fiber is then... The end of the optical fiber furthest from the coupling output is connected to the second photoelectric conversion device. The light source assembly is optically connected to the coupling input by emitting a working optical signal. The emitted working optical signal is transmitted through the coupling input, the coupling element, the coupling output, the optical fiber, and the second photoelectric conversion device. The second photoelectric conversion device receives the working optical signal and converts it into an electrical signal. The connection position of the light source assembly and the coupling input is adjusted. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, the light source assembly is fixed in the current second connection position, completing the connection of the optical fiber coupling structure. This ensures that the laser light source and the coupling input, and the optical fiber and the coupling output, achieve a coupling effect. The operation is simple and efficient. The optical fiber coupling structure connection method provided by this invention simplifies the coupling process and achieves high manufacturing efficiency without the need for high-precision automated equipment.

[0009] Furthermore, the first photoelectric conversion component is a photodetector, and the second photoelectric conversion component is an optical power meter. This is one specific implementation. When the optical fiber is coupled to the coupling output end, the photodetector receives the test optical signal, thereby monitoring the coupling status between the optical fiber and the coupling output end in real time. The optical power meter is connected to the coupling element through the optical fiber, thus receiving the operating electrical signal of the light source component and displaying the real-time optical power to facilitate adjustment of the connection position of the light source component.

[0010] Furthermore, the light source assembly includes an emitting light source and a condensing lens. The emitting light source is optically connected to the coupling input terminal by emitting a working light signal; the condensing lens is located in the optical path between the emitting light source and the coupling input terminal.

[0011] Further, adjusting the connection position of the light source component and the coupling input terminal, and fixing the light source component at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, completes the connection of the fiber optic coupling structure. This step includes: adjusting the positions of the emitting light source and the condensing lens; fixing the emitting light source at the current light source connection position and the condensing lens at the current lens connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value. First, the optical fiber is coupled to the modulator, and then the emitting light source and the condensing lens are adjusted so that the emitting light source can couple with the modulator.

[0012] Further, adjusting the connection position of the light source assembly and the coupling input terminal, and fixing the light source assembly at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, completes the connection of the fiber optic coupling structure. This step includes adjusting the horizontal position, vertical position, deflection angle, and distance between the condenser lens and the modulator until the electrical signal output by the second photoelectric conversion device reaches its maximum value. Then, the emitting light source is fixed at the current light source connection position, and the condenser lens is fixed at the current lens connection position. First, the optical fiber is coupled to the modulator, and then the optical connection between the emitting light source and the condenser lens and modulator is adjusted to allow the emitting light source to couple with the modulator.

[0013] Furthermore, the light source assembly also includes an optical isolator, which is located between the condenser lens and the coupling input terminal, and is situated in the optical path between the emitting light source, the condenser lens, and the coupling input terminal.

[0014] Further, adjusting the connection position of the light source component and the coupling input terminal, and fixing the light source component at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, the step of completing the connection of the fiber optic coupling structure includes: adjusting the positions of the emitting light source, the condensing lens, and the optical isolator; fixing the emitting light source at the current light source connection position, the condensing lens at the current lens connection position, and the optical isolator at the current optical isolator connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value.

[0015] Furthermore, the step of connecting one end of the optical fiber to the coupling output end and the other end of the optical fiber to the test light source includes: the coupling output end has a coupling output surface, and one end face of the optical fiber is brought into contact with the coupling output surface; adjusting the connection position of the optical fiber and the coupling output end, and fixing the optical fiber at the current first connection position when the electrical signal strength output by the first photoelectric conversion device reaches its maximum value includes: moving the end face of the optical fiber on the coupling output surface to adjust the connection position of the optical fiber and the coupling output end, and fixing the optical fiber at the current first connection position when the electrical signal strength output by the first photoelectric conversion device reaches its maximum value. This is a specific implementation method, in which the optimal coupling position is found by moving the end face of the optical fiber on the coupling output surface.

[0016] Furthermore, the step of fixing the optical fiber to the current first connection position includes: fixing the optical fiber to the current first connection position using optical UV adhesive. During the adjustment of the position of the optical fiber and the coupling output end, when the electrical signal strength output by the first photoelectric conversion device is the largest, it indicates that the coupling effect between the optical fiber and the coupling input end is optimal at that connection position. Optical UV adhesive is then used to fix the optical fiber at the optimal coupling first connection position.

[0017] Further, the coupling element includes a first optical waveguide strip, a second optical waveguide strip, and a modulation module; the coupling input end, the first optical waveguide strip, the modulation module, the second optical waveguide strip, and the coupling output end are connected sequentially, and the first photoelectric conversion device is connected to the first optical waveguide strip or the second optical waveguide strip; or, the coupling element includes a first optical waveguide strip and a second optical waveguide strip, the coupling input end, the first optical waveguide strip, the second optical waveguide strip, and the coupling output end are connected sequentially, and the first photoelectric conversion device is connected to the first optical waveguide strip or the second optical waveguide strip. In one embodiment, the modulation module modulates the light beam entering the optical fiber from the emitting light source. To achieve coupling between the optical fiber and the coupling output end, the photoelectric conversion device detects the electrical signal to verify the coupling effect; the first photoelectric conversion device can be set on either the first or second optical waveguide strip to detect the electrical signal; or, when the working optical signal of the emitting light source is transmitted to the optical fiber after propagation through the first and second optical waveguide strips, the connection method of the above-described optical fiber coupling structure can also be used to achieve the connection.

[0018] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a flowchart of the connection method of the optical fiber coupling structure in the embodiment.

[0020] Figure 2 This is a schematic diagram of the fiber optic coupling structure in an embodiment.

[0021] Figure 3 This is a schematic diagram of the modulator in the embodiment.

[0022] Figure 4 This is a schematic diagram of the emission light source in an embodiment. Detailed Implementation

[0023] The embodiments described herein will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments and not intended to limit them. Furthermore, it should be noted that, for ease of description, only the parts relevant to the embodiments described herein are shown in the drawings, not the entire structure.

[0024] Furthermore, the terms "first," "second," "third," etc., used in the specification and claims are only for the purpose of distinguishing the description of the same technical features and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated, nor necessarily the order of description or chronological sequence. Where appropriate, the terms are interchangeable. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] Similarly, the terms "fixed" and "connected" are used in the specification and claims and should not be construed as limited to a direct connection. Therefore, the expression "device A is connected to device B" should not be limited to device A being directly connected to device B in a device or system; it means that there is a path between device A and device B, which can be a path that includes other devices or tools.

[0026] This embodiment provides a connection method for an optical fiber coupling structure. Figure 1 This is a flowchart of the connection method for the optical fiber coupling structure. Figure 2 This is a schematic diagram of an optical fiber coupling structure. Figure 3 This is a schematic diagram of the modulator structure, such as... Figure 1-3 As shown, the fiber optic coupling structure includes a first photoelectric conversion device, a second photoelectric conversion device, and a light source assembly 1, a modulator 2, and an optical fiber 3 connected in sequence; the modulator 2 includes a coupling input terminal 21, a coupling element 22, and a coupling output terminal 23 connected in sequence.

[0027] The connection method of the optical fiber coupling structure includes the following steps: S1, connect the first photoelectric conversion device to the coupling member 22; connect one end of the optical fiber 3 to the coupling output end 23, and connect the other end of the optical fiber 3 to the test light source 6. The test light signal emitted by the test light source 6 is transmitted sequentially in the optical fiber 3, the coupling output end 23, the coupling member 22 and the first photoelectric conversion device. The first photoelectric conversion device receives the test light signal and converts it into an electrical signal. S2, adjust the connection position of optical fiber 3 and coupling output terminal 23, and when the electrical signal strength output by the first photoelectric conversion device reaches the maximum value, fix optical fiber 3 in the current first connection position. S3, separate the optical fiber 3 from the test light source 6; connect the end of the optical fiber 3 away from the coupling output end 23 to the second photoelectric conversion device; S4, the light source component 1 is optically connected to the coupling input terminal 21 by emitting a working light signal. The emitted working light signal is transmitted sequentially through the coupling input terminal 21, the coupling element 22, the coupling output terminal 23, the optical fiber 3, and the second photoelectric conversion device. The second photoelectric conversion device receives the working light signal and converts it into an electrical signal. S5, adjust the connection position between the light source component 1 and the coupling input terminal 21. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, fix the light source component 1 at the current second connection position to complete the connection of the optical fiber coupling structure.

[0028] Modulator 2 can be used to split the beam into several paths proportionally, or to modulate the beam. For example, when using a Mach-Zehnder modulator to modulate the beam, the connection method of the fiber coupling structure provided in Embodiment 1 can be used to complete the coupling of modulator 2 with the transmitting light source 11 and fiber 3. Fiber 3 can be selected as single-mode fiber 3 or multimode fiber 3.

[0029] Preferably, in S1, the step of connecting one end of the optical fiber 3 to the coupling output end 23 and connecting the other end of the optical fiber 3 to the test light source 6 includes: the coupling output end 23 is provided with a coupling output surface, and one end face of the optical fiber 3 is in contact with the coupling output surface; In step S2, the step of adjusting the first connection position between the optical fiber 3 and the coupling output terminal 23, and fixing the optical fiber 3 at the current first connection position when the electrical signal strength output by the first photoelectric conversion device reaches its maximum value, includes: moving the end face of the optical fiber 3 on the coupling output surface to adjust the connection position between the optical fiber 3 and the coupling output terminal 23; and fixing the optical fiber 3 at the current first connection position when the electrical signal strength output by the photoelectric detection device reaches its maximum value. This is one specific implementation method, where the optimal coupling position is found by moving the end face of the optical fiber 3 on the coupling output surface. During operation, a clamping device can be used to clamp the optical fiber 3 and move it on the coupling output surface.

[0030] More preferably, in S2, the step of fixing the optical fiber 3 to the current first connection position includes: fixing the optical fiber 3 to the current position using optical UV adhesive. During the adjustment of the position of the optical fiber 3 and the coupling output end 23, when the electrical signal strength detected by the first photoelectric conversion device is the largest, it indicates that the coupling effect between the optical fiber 3 and the coupling input end 21 is optimal at that position. Optical UV adhesive is then used to fix the optical fiber 3 to the optimal first connection position.

[0031] Even better, such as Figure 3 As shown, the coupling element 22 includes a first optical waveguide 221, a second optical waveguide 222, and a modulation module 224; the coupling input terminal 21, the first optical waveguide 221, the modulation module 224, the second optical waveguide 222, and the coupling output terminal 23 are connected in sequence, and the first photoelectric conversion device is electrically connected to the first optical waveguide 221 or the second optical waveguide 222. Alternatively, the coupling element 22 includes a first optical waveguide strip 221 and a second optical waveguide strip 222, and the coupling input end 21, the first optical waveguide strip 221, the second optical waveguide strip 222 and the coupling output end 23 are connected in sequence; the first photoelectric conversion device is electrically connected to the first optical waveguide strip 221 or the second optical waveguide strip 222.

[0032] This is one specific implementation. The modulation module 224 modulates the light beam entering the optical fiber 3 from the transmitting light source 11. To achieve coupling between the optical fiber 3 and the coupling output end 23, the first photoelectric conversion device detects the electrical signal to verify the coupling effect. The first photoelectric conversion device can be set on either the first optical waveguide 221 or the second optical waveguide 222 to detect the electrical signal. Alternatively, when the working optical signal emitted by the transmitting light source 11 is transmitted to the optical fiber after propagation through the first optical waveguide 221 and the second optical waveguide 222, the connection method of the above-mentioned optical fiber coupling structure can also be used to achieve the connection.

[0033] In another embodiment, the coupling element 22 is used to split the light beam into several beams. The coupling element 22 includes a first optical waveguide strip 221 and several second optical waveguide strips 222. The number of coupling output terminals 23 is the same as the number of second optical waveguide strips 222. One end of each second optical waveguide strip 222 is connected to the first optical waveguide strip 221, and the other end is connected to a coupling output terminal 23. Each second optical waveguide strip 222 is provided with a first photoelectric conversion device, and the first optical waveguide strip 221 is also provided with a first photoelectric conversion device.

[0034] The electrical signal converted by the photoelectric conversion device can be voltage, current, or power. When the voltage, current, or power reaches its maximum value, it indicates that the position is the optimal coupling position. For example, in a specific embodiment, the first photoelectric conversion component is a photodetector 5, and the second photoelectric conversion component is an optical power meter.

[0035] In the above embodiment, when the optical fiber 3 is coupled to the coupling output terminal 23, the photodetector 5 receives the test optical signal to monitor the coupling status between the optical fiber 3 and the coupling output terminal 23 in real time; the optical power meter receives the working electrical signal of the light source component 1 through the optical fiber 3 to display the real-time optical power so as to adjust the connection position of the light source component 1 accordingly.

[0036] Existing modulators typically include more than one photodetector 5 to monitor optical communication during operation. However, in this invention, the photodetector 5 in the modulator 2 is used in the coupling connection process of the fiber optic coupling structure. This eliminates the need for high-precision automated equipment and additional components, allowing coupling to be completed under normal conditions, thus reducing labor and material costs associated with coupling debugging. Compared to existing technologies, this invention eliminates the need for a condenser lens to adjust the coupling between the fiber 3 and the modulator 2, thereby solving the problem of the condenser lens's adjustment range being smaller than the error range caused by installation.

[0037] Preferably, such as Figure 2 As shown, the light source assembly 1 includes an emitting light source 11 and a condenser lens 12; the emitting light source 11 is optically connected to the coupling input terminal 21 by emitting a working light signal; the condenser lens 12 is located in the optical path between the emitting light source 11 and the coupling input terminal 21. The emitting light source 11 can be selected from a semiconductor laser or a laser diode.

[0038] More preferably, in S5, the step of adjusting the connection position of the light source assembly 1 and the coupling input terminal 21, and fixing the light source assembly 1 at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, includes: adjusting the position of the emitting light source 11 and the condensing lens 12, and fixing the emitting light source 11 at the current light source connection position and the condensing lens 12 at the current lens connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value.

[0039] Specifically, the emitting light source 11 and the condensing lens 12 can be pre-installed before the optical fiber 3 is coupled, and then adjusted after the optical fiber 3 is coupled. Alternatively, the emitting light source 11 and the condensing lens 12 can be installed and adjusted after the optical fiber 3 is coupled. The condensing lens 12 can be a silicon photonic lens, and its refractive index and radius of curvature can be pre-designed to converge the beam of the emitting light source 11. The coupling effect between the emitting light source 11 and the coupling input terminal 21 can be adjusted by rotating and moving the silicon photonic lens. In this step, the second photoelectric conversion component used can be an optical power meter. After the optical fiber is separated from the emitting light source, the optical power meter is connected to the light source.

[0040] More preferably, in step S5, the step of adjusting the connection position of the light source assembly 1 and the coupling input terminal 21, and fixing the light source assembly 1 at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, includes: adjusting the horizontal position, vertical position, and distance between the condenser lens 12 and the modulator 2 until the optical power detected by the photoelectric conversion device reaches its maximum value, then fixing the emitting light source 11 at the current light source connection position and fixing the condenser lens 12 at the current lens connection position. This is a specific implementation method. By adjusting the condenser lens and the optical isolator, the optical signal of the emitting light source is finely adjusted until the electrical signal strength reaches its maximum, then the emitting light source 11 and the condenser lens 12 are fixed to achieve the best coupling effect with the modulator 2.

[0041] Even better, such as Figure 2 As shown, the light source assembly 1 also includes an optical isolator 13, which is located between the condenser lens 12 and the coupling input terminal 21, and is located in the optical path between the emitting light source 11, the condenser lens 12 and the coupling input terminal 21.

[0042] More preferably, in step S5, the step of adjusting the connection position of the light source assembly 1 and the coupling input terminal 21, and fixing the light source assembly 1 at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, includes: adjusting the positions of the emitting light source 11, the condenser lens 12, and the optical isolator 13; fixing the emitting light source 11 at the current light source connection position, fixing the condenser lens 12 at the current lens connection position, and fixing the optical isolator 13 at the current optical isolator connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value. During operation, the coupling position can be adjusted by adjusting the height of the optical isolator 13 and the distance between the optical isolator 13 and the modulator 2.

[0043] Figure 4 This is a schematic diagram of the emitting light source, such as... Figure 4 As shown, the emitting light source 11 includes a housing 111, a cooler 114, a mounting substrate 113, and a light source body 112; the housing 111 has a through-hole for emission opposite to the modulator 2; the cooler 114, the mounting substrate 113, and the light source body 112 are stacked sequentially at the bottom of the housing 111 along the direction from the bottom to the top of the housing 111, and the working light signal emitted by the light source body 112 is emitted from the through-hole to the outside of the housing 111.

[0044] Specifically, the light source body 112 is a semiconductor laser (DFB); the mounting substrate 113 is an AI ceramic substrate; and the cooler 114 is a semiconductor cooler (TEC). The semiconductor laser is mounted onto the mounting substrate 113, the mounting substrate 113 is mounted onto the semiconductor cooler, and the semiconductor cooler is then mounted on the bottom of the housing 111. Since the coupling margin between the condenser lens 12, the optical isolator 13, and the modulator 2 is relatively large, the condenser lens 12 and the optical isolator 13 can be pre-placed according to the pre-designed optical path propagation route to complete the pre-installation. Install fiber optic cable 3 on coupling output end 23 to complete pre-installation. Set up a test light source at the other end of fiber optic cable 3 and adjust the test light signal emitted by the test light source to be able to enter fiber optic cable 3. Move fiber optic cable 3 so that its end face moves on the coupling output surface, adjust the connection position between the end face of fiber optic cable 3 and the coupling output surface, and verify the coupling effect by detecting the current magnitude through photodetector 5. At the position where the current is measured to be at its maximum value, fix fiber optic cable 3 to the current first connection position with optical UV glue to complete the coupling of fiber optic cable 3 and modulator 2. The test light source is removed, and the Gaussian beam of the emitting light source 11 is focused and the emitted light signal of the emitting light source 11 is finely adjusted by adjusting the condenser lens 12. At the same time, the real-time optical power of the optical fiber 3 is detected by the optical power meter. The optical fiber is coupled at the point where the measured optical power is the maximum, thus completing the connection of the optical fiber coupling structure.

[0045] The modulation module 224 includes at least one of an electrode, an optical waveguide, and a grating structure. The technical solution of this invention is applicable to various optical coupling operations such as beam modulation, beam splitting, and grating diffraction.

[0046] This invention is not limited to the above-described embodiments. If any modifications or variations to this invention do not depart from the spirit and scope of this invention, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this invention, then this invention also intends to include such modifications and variations.

Claims

1. A connection method for an optical fiber coupling structure, characterized in that: The fiber optic coupling structure includes a first photoelectric conversion device, a second photoelectric conversion device, and a light source assembly, a modulator, and an optical fiber connected in sequence; the modulator includes a coupling input terminal, a coupling element, and a coupling output terminal connected in sequence. The connection method of the optical fiber coupling structure includes the following steps: The first photoelectric conversion device is connected to the coupling element; one end of the optical fiber is connected to the coupling output end, and the other end of the optical fiber is connected to the test light source. The test light signal emitted by the test light source is transmitted sequentially in the optical fiber, the coupling output end, the coupling element, and the first photoelectric conversion device. The first photoelectric conversion device receives the test light signal and converts it into an electrical signal. The coupling output end is provided with a coupling output surface, and one end face of the optical fiber is in contact with the coupling output surface. Adjust the connection position of the optical fiber and the coupling output end, so that the end face of the optical fiber moves on the coupling output surface to adjust the connection position of the optical fiber and the coupling output end. When the electrical signal strength output by the first photoelectric conversion device reaches the maximum value, fix the optical fiber at the current first connection position. Separate the optical fiber from the test light source; connect the end of the optical fiber furthest from the coupling output end to the second photoelectric conversion device; The light source component is optically connected to the coupling input terminal by emitting a working optical signal. The working optical signal emitted by the light source component is transmitted sequentially in the coupling input terminal, the coupling element, the coupling output terminal, the optical fiber, and the second photoelectric conversion device. The second photoelectric conversion device receives the working optical signal and converts it into an electrical signal. Adjust the connection position between the light source component and the coupling input terminal. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, fix the light source component at the current second connection position to complete the connection of the optical fiber coupling structure.

2. The connection method of the optical fiber coupling structure according to claim 1, characterized in that: The first photoelectric conversion device is a photodetector, and the second photoelectric conversion device is an optical power meter.

3. The connection method of the optical fiber coupling structure according to claim 1, characterized in that: The light source assembly includes an emitting light source and a condenser lens; the emitting light source is optically connected to the coupling input terminal by emitting a working light signal; the condenser lens is located in the optical path between the emitting light source and the coupling input terminal.

4. The connection method of the optical fiber coupling structure according to claim 3, characterized in that, The steps of adjusting the connection position of the light source component and the coupling input terminal, and fixing the light source component at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, to complete the connection of the fiber optic coupling structure include: Adjust the connection positions of the emitting light source and the condensing lens to the coupling input terminal. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, fix the emitting light source at the current light source connection position and fix the condensing lens at the current lens connection position.

5. The connection method of the optical fiber coupling structure according to claim 4, characterized in that, The steps of adjusting the connection position of the light source component and the coupling input terminal, and fixing the light source component at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, to complete the connection of the fiber optic coupling structure include: Adjust the horizontal and vertical positions, deflection angle, and distance between the condenser lens and the modulator until the electrical signal output by the second photoelectric conversion device reaches its maximum value. Then, fix the emitting light source at the current light source connection position and the condenser lens at the current lens connection position.

6. The connection method of the optical fiber coupling structure according to claim 3, characterized in that: The light source assembly also includes an optical isolator located between the condenser lens and the coupling input terminal, and in the optical path between the emitting light source, the condenser lens, and the coupling input terminal.

7. The connection method of the optical fiber coupling structure according to claim 6, characterized in that, The steps of adjusting the connection position of the light source component and the coupling input terminal, and fixing the light source component at the current second connection position when the electrical signal output by the second photoelectric conversion device reaches its maximum value, to complete the connection of the fiber optic coupling structure include: Adjust the positions of the emitting light source, the condensing lens, and the optical isolator. When the electrical signal output by the second photoelectric conversion device reaches its maximum value, fix the emitting light source at the current light source connection position, fix the condensing lens at the current lens connection position, and fix the optical isolator at the current optical isolator connection position.

8. The connection method of the optical fiber coupling structure according to claim 1, characterized in that: The step of fixing the optical fiber to the current first connection position includes: fixing the optical fiber to the current first connection position with optical UV adhesive.

9. The connection method of the optical fiber coupling structure according to claim 1, characterized in that: The coupling element includes a first optical waveguide strip, a second optical waveguide strip, and a modulation module. The coupling input end, the first optical waveguide strip, the modulation module, the second optical waveguide strip, and the coupling output end are connected in sequence. The first photoelectric conversion device is connected to the first optical waveguide strip or the second optical waveguide strip. Alternatively, the coupling element includes a first optical waveguide strip and a second optical waveguide strip, with the coupling input end, the first optical waveguide strip, the second optical waveguide strip, and the coupling output end connected in sequence, and the first photoelectric conversion device connected to the first optical waveguide strip or the second optical waveguide strip.

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