CN111338037A - Optical fiber coupling adjustment device and adjustment method thereof - Google Patents

Abstract

The invention discloses an optical fiber coupling adjusting device and an adjusting method thereof, wherein the optical fiber coupling adjusting device comprises a first fixing piece, a second fixing piece and a plurality of piezoelectric ceramic stacks, a first mounting hole for mounting an optical fiber coupler is formed in the middle of the first fixing piece, a second mounting hole for mounting an optical fiber is formed in the middle of the second fixing piece, and the plurality of piezoelectric ceramic stacks are arranged between the first fixing piece and the second fixing piece to drive the first fixing piece and further drive the optical fiber coupler mounted in the first mounting hole to move in three degrees of freedom. The invention creatively applies the piezoelectric ceramic stack to the optical fiber coupling adjusting device, and solves the problems of insufficient adjusting precision, easy overshoot and the like of the traditional optical fiber coupling adjusting device.

Description

Optical fiber coupling adjustment device and adjustment method thereof

technical field

The invention relates to the field of optical fibers, in particular to an optical fiber coupling adjustment device and an adjustment method thereof.

Background technique

Precision optical instruments are widely used in many fields such as precision testing and measurement, equipment testing and analysis, and their working light sources are often provided by lasers through optical fibers.

Fiber couplers are an important part of high-power lasers. Its function is to vary the beam diameter and couple the laser output beam into the fiber with minimal loss of optical power and with as small a beam numerical aperture as possible.

The fiber coupler is mainly composed of a coupling mirror and an optical fiber joint. The laser is focused on the optical fiber joint through the focusing effect of the coupling mirror, and then output through the optical fiber. When the focus of laser convergence hits the center of the fiber connector, the coupling efficiency is the highest at this time, and the light spot projected on the light screen through the fiber should be a circular light spot with uniform and continuous power density. If the focus of the laser does not converge on the fiber connector, the coupling efficiency will be reduced and the light intensity will drop; if the focus of the laser is converged on the fiber connector, but not on the center of the fiber connector, it will be projected to the light screen through the fiber The light spot on the top is caused by a ring shape, the power density is not uniform, and the quality of the light output is reduced. The traditional three-degree-of-freedom fiber coupling adjustment device is often adjusted manually, which is laborious and time-consuming to debug, especially when it is very difficult to couple spatial light into a single-mode fiber with a core diameter of only a few microns, and the debugging is laborious and time-consuming.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an optical fiber coupling adjustment device and an adjustment method thereof, so as to solve the above-mentioned problems in the prior art.

In order to solve the above problems, according to an aspect of the present invention, an optical fiber coupling adjustment device is provided, the optical fiber coupling adjustment device includes a first fixing member, a second fixing member and a plurality of piezoelectric ceramic stacks, the first fixing member The middle part of the fixing piece is provided with a first installation hole for installing the optical fiber coupler, the middle part of the second fixing piece is provided with a second installation hole for installing the optical fiber, and the plurality of piezoelectric ceramics are stacked and arranged on the first fixing piece and the second fixing member to drive the first firmware and then drive the optical fiber coupler installed in the first installation hole to move with three degrees of freedom.

In one embodiment, an elastic member is disposed between the first fixing member and the second fixing member, and two ends of the elastic member are respectively connected to the opposite sides of the first fixing member and the second fixing member. s surface.

In one embodiment, the plurality of piezoelectric ceramic stacks are uniformly arranged around the first mounting hole.

In one embodiment, the optical fiber coupling adjustment device includes three piezoelectric ceramic stacks, the three piezoelectric ceramic stacks are evenly distributed around the first mounting hole, and every adjacent two piezoelectric ceramic stacks An elastic piece is placed between the piles.

In one embodiment, the first fixing member is a disc member, the first installation hole is set at the center of the disc member, and the inner diameter of the first installation hole is the same as the outer diameter of the optical fiber coupler In cooperation, the optical fiber coupler is fixedly installed in the first installation hole.

In one embodiment, the second fixing member is a disc member, the second installation hole is disposed at the center of the disc member, and the inner diameter of the second installation hole is larger than the outer diameter of the optical fiber.

In one embodiment, the elastic member is a spring.

In one embodiment, the piezoelectric ceramic stack is connected to a power source through a wire, one end of the wire is connected to the power source, and the other end of the wire is connected to the piezoelectric ceramic stack through the second mounting hole connect.

In one embodiment, the first fixing member and the second fixing member are arranged concentrically such that the first mounting hole and the second mounting hole are aligned with each other.

In one embodiment, the optical fiber coupling adjustment device includes four piezoelectric ceramic stacks, the four piezoelectric ceramic stacks are evenly distributed around the first mounting hole, and every two adjacent piezoelectric ceramic stacks At least one elastic member is arranged between the stacks.

According to another aspect of the present invention, a method for adjusting an optical fiber coupling adjustment device is also provided, the optical fiber coupling adjustment device includes a first fixing member and a plurality of piezoelectric ceramic stacks, and the method includes the following steps:

Step 1: Coarsely adjust the first fixing piece so that the space light is irradiated to the center of the first fixing piece;

Step 2: A certain voltage is respectively applied to the plurality of piezoelectric ceramic stacks, and the plurality of piezoelectric ceramic stacks move along the normal direction of the first fixing member under the condition of electrification, so as to realize the first step. A three-degree-of-freedom motion adjustment of a fixed piece.

In one embodiment, the second step includes:

The same voltage is applied to the multiple groups of piezoelectric ceramic stacks, and the displacements of the three groups of piezoelectric ceramic stacks are the same, so as to realize the adjustment of the translational degree of freedom of the first fixing member along the Z direction;

When different voltages are applied to the multiple groups of piezoelectric ceramic stacks and the voltages satisfy a certain relationship, the adjustment of the rotational degree of freedom around the X direction or the adjustment of the rotational freedom around the Y direction of the first fixing member is realized , wherein the Z direction is the normal direction of the first fixing member, and the X, Y and Z directions are perpendicular to each other.

The invention creatively applies the piezoelectric ceramic stack to the optical fiber coupling adjustment device, solves the problems of insufficient adjustment precision and easy overshoot of the traditional optical fiber coupling adjustment device, and enables the optical fiber coupling adjustment device to realize fully automatic operation.

Description of drawings

Fig. 1 is the front view of the optical fiber coupling adjustment device of the present invention, which is not provided with the elastic member and the second fixing member;

Fig. 2 is the right side view of the optical fiber coupling adjustment device of Fig. 1;

Fig. 3 is the top view of the optical fiber coupling adjustment device of Fig. 1;

4 is a front view of the optical fiber coupling adjustment device, including an elastic member and a second fixing member;

Fig. 5 is the right side view of the optical fiber coupling adjustment device of Fig. 4;

Figure 6 is a top view of the fiber coupling adjustment device of Figure 4; and

FIG. 7 is a schematic diagram of a fiber coupling adjustment device according to another embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solutions of the present invention.

In the following description, for the purpose of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures or characteristics may be combined in any manner in one or more embodiments.

In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but "front", "rear", "left", "right", "outer", "inner" should be "," "outward", "inward", "up", "down" and other words are to be understood as convenient terms, and should not be understood as limiting words.

The present invention generally relates to an optical fiber coupling adjustment device 100, which includes a first fixing member 10, a second fixing member 20 and a plurality of piezoelectric ceramic stacks 30, and a first fixing member 10 is provided with a first fixing member 10 in the middle for installing the optical fiber coupler. An installation hole 11, a second installation hole 21 for installing optical fibers is provided in the middle of the second fixing member, and a plurality of piezoelectric ceramic stacks 30 are arranged between the first fixing member 10 and the second fixing member 20 to drive the first firmware 10 and then drive the optical fiber coupler 40 installed in the first mounting hole 11 to move with three degrees of freedom. For example, the direction perpendicular to the mounting surface of the first fixing member is defined as the Z-axis direction, and the two mutually perpendicular axes parallel to the mounting surface of the first fixing member are defined as the X-axis and Y-axis directions, then by adjusting The current directions and magnitudes of the multiple piezoelectric ceramic stacks can realize the rotational movement of the optical fiber coupler around the X-axis, the Y-axis and the linear movement perpendicular to the Z-axis driven by the first fixing member. Therefore, the present invention creatively applies the piezoelectric ceramic stack to the optical fiber coupling adjustment device, which solves the problems of insufficient adjustment accuracy and easy overshoot of the traditional optical fiber coupling adjustment device, so that the optical fiber coupling adjustment device can realize fully automatic operation. .

An embodiment of the present invention will be described in detail below with reference to FIGS. 1-6 .

1 is a front view of the optical fiber coupling adjustment device 100 of the present invention, which is not provided with an elastic member and a second fixing member, FIG. 2 is a right side view of the optical fiber coupling adjustment device 100 of FIG. 1 , and FIG. 3 is the optical fiber coupling adjustment device of FIG. 1 Top view of device 100. FIG. 4 is a front view of the optical fiber coupling adjustment device 100 including an elastic member and a second fixing member, FIG. 5 is a right side view of the optical fiber coupling adjustment device 100 in FIG. 4 , and FIG. 6 is a top view of the optical fiber coupling adjustment device 100 in FIG. 4 .

As shown in FIGS. 1-6 , the optical fiber coupling adjustment device 100 includes a first fixing member 10 , a second fixing member 20 and a plurality of piezoelectric ceramic stacks 30 , and a middle portion of the first fixing member 10 is provided with a first fixing member 10 for mounting the optical fiber coupler. An installation hole 11, a second installation hole 21 for installing optical fibers is provided in the middle of the second fixing member, and a plurality of piezoelectric ceramic stacks 30 are arranged between the first fixing member 10 and the second fixing member 20 to drive the first firmware 10 and then drive the optical fiber coupler 40 installed in the first mounting hole 11 to move with three degrees of freedom.

In the embodiment shown in FIG. 1 , the fiber coupling adjustment device 100 includes a first piezoelectric ceramic stack 31 , a second piezoelectric ceramic stack 32 and a third piezoelectric ceramic stack 33 . Specifically, the first piezoelectric ceramic stack 31 , the second piezoelectric ceramic stack 32 and the third piezoelectric ceramic stack 33 are fixed on the first fixing member 10 around the first mounting hole 11 . The first piezoelectric ceramic stack 31 , the second piezoelectric ceramic stack 32 and the third piezoelectric ceramic stack 33 are all piezoelectric ceramic stacks in d33 mode, which can move along the normal direction of the first fixing member 10 .

In one embodiment, the first piezoelectric ceramic stack 31 , the second piezoelectric ceramic stack 32 and the third piezoelectric ceramic stack 33 are evenly arranged around the first mounting hole 11 .

The optical fiber coupler 40 is installed in the first mounting hole 11, and is connected to the optical fiber 50 at one end (the right end shown in FIG. 2 ), and light enters from the other end (the left end shown in FIG. 2 ) of the optical fiber coupler 40 and passes through the optical fiber 50 spread. The function of the optical fiber coupler 40 is to couple the spatial light into the optical fiber for transmission. The optical fiber coupling adjustment device of the present invention solves the problem of adjusting the three degrees of freedom of the optical fiber coupler 40 so that the light transmitted from the optical fiber meets the requirements.

The specific implementation steps are as follows:

Step 1: Roughly adjust the first fixing member 10 so that the spatial light is irradiated to the center position of the first fixing member 10 .

The second step: apply a certain voltage to the three groups of piezoelectric ceramic stacks respectively, and the piezoelectric ceramic stacks move along the normal direction of the first fixing member 10 under the condition of electrification (that is, the direction perpendicular to the first fixing member 10 in FIG. 1 ) directional movement of the surface).

Specifically, when the same voltage is applied to the three groups of piezoelectric ceramic stacks, the displacements of the three groups of piezoelectric ceramic stacks are the same, and the translational degree of freedom of the first fixing member 10 along the Z direction can be adjusted; When different voltages are applied to the electrical ceramic stack and the three sets of voltages satisfy a certain relationship, the adjustment of the rotational freedom of the first fixing member 10 around the X direction or the adjustment of the rotational freedom around the Y direction can be achieved; The voltages applied by the piezoelectric ceramic stack 31 and the second piezoelectric ceramic stack 32 are reversed, so that the first fixing member 10 can drive the optical fiber coupler 40 to rotate around the X axis, and the first piezoelectric ceramic stack 31 and the When the voltage applied by the second piezoelectric ceramic stack 32 is the same and opposite to that applied by the third piezoelectric ceramic stack, the first fixing member 10 can drive the optical fiber coupler 40 to rotate around the Y axis.

As shown in FIGS. 4-6 , an elastic member 60 is disposed between the first fixing member 10 and the second fixing member 20 , and two ends of the elastic member 60 are respectively connected to the opposite surfaces of the first fixing member 10 and the second fixing member 20 . . When the first fixing member 10 moves, the second fixing member 20 and the first fixing member 10 play the role of fixing the piezoelectric ceramic stack.

In one embodiment, the three piezoelectric ceramic stacks 31 , 32 , 33 are evenly distributed around the first mounting hole 11 , and an elastic member 60 is disposed between every two adjacent piezoelectric ceramic stacks.

In one embodiment, the first fixing member 10 is a disc member, a first installation hole 11 is set at the center of the disc member, and the inner diameter of the first installation hole 11 is matched with the outer diameter of the optical fiber coupler 40, so that the optical fiber coupler 40 can be fixedly mounted in the first mounting hole 11 . The second fixing member 20 is a disc member, the second mounting hole 21 is arranged at the center of the second disc member, and the inner diameter of the second mounting hole 21 is larger than the outer diameter of the optical fiber 50 .

In one embodiment, the elastic member 60 is a spring.

The first piezoelectric ceramic stack 31, the second piezoelectric ceramic stack 32 and the third piezoelectric ceramic stack 33 are connected to the power supply through wires (not shown), one end of the wires is connected to the power source, and the other end of the wires passes through The second mounting holes 21 are connected to the first piezoelectric ceramic stack 31 , the second piezoelectric ceramic stack 32 and the third piezoelectric ceramic stack 33 .

In one embodiment, the first fixing member 10 and the second fixing member 20 are arranged concentrically such that the first mounting hole 11 and the second mounting hole 21 are aligned with each other.

FIG. 7 is a schematic diagram of a fiber coupling adjustment device 200 according to another embodiment of the present invention. Another embodiment of the present invention will be described below with reference to FIG. 7 . The difference between this embodiment and the previous embodiment lies in the number of groups of piezoelectric ceramic stacks, and the rest is the same as the previous embodiment, so this part only describes the differences from the previous embodiment, and this part does not describe in detail Where the description is made, reference is made to the relevant description of the previous embodiment.

As shown in FIG. 7 , the optical fiber coupling adjustment device 200 includes four groups of piezoelectric ceramic stacks, which are a first piezoelectric ceramic stack 81 , a second piezoelectric ceramic stack 82 , a third piezoelectric ceramic stack 83 and a third piezoelectric ceramic stack 83 . Four piezoelectric ceramic stacks 84 , four groups of piezoelectric ceramic stacks are fixed on the first fixing member 10 around the first mounting hole 11 . The four groups of piezoelectric ceramic stacks are all d33 mode piezoelectric ceramic stacks, which can move along the normal direction of the first fixing member 10 .

In one embodiment, four sets of piezoelectric ceramic stacks are evenly arranged around the first mounting hole 11 .

The specific implementation steps are as follows:

Step 1: Coarsely adjust the first fixing member 10 so that the spatial light is irradiated to the center of the first fixing member.

The second step: apply a certain voltage to the four groups of piezoelectric ceramic stacks respectively, and the four groups of piezoelectric ceramic stacks move along the normal direction of the first fixing member 10 under the condition of electrification (that is, perpendicular to the first fixing member in FIG. 1 ) 10 directional movement of the surface). Specifically, when the same voltage is applied to the four groups of piezoelectric ceramic stacks, the displacements of the four groups of piezoelectric ceramic stacks are the same, so that the translational degree of freedom of the first fixing member 10 along the Z direction can be adjusted; When different voltages are applied to the electrical ceramic stack and the voltages satisfy a certain relationship, the adjustment of the rotational freedom of the first fixing member 10 around the X-direction or the Y-direction can be achieved. For example, if the voltages applied by the first piezoelectric ceramic stack 81 and the second piezoelectric ceramic stack 82 are opposite to those applied by the third piezoelectric ceramic stack 83 and the fourth piezoelectric ceramic stack 84, the first fixing member can be realized. 10 drives the rotation of the optical fiber coupler 40 around the Y axis, while the first piezoelectric ceramic stack 81 and the fourth piezoelectric ceramic stack 84 and the second piezoelectric ceramic stack 82 and the third piezoelectric ceramic stack 83 apply When the voltage is reversed, the first fixing member 10 can drive the optical fiber coupler 40 to rotate around the X-axis.

In one embodiment, four piezoelectric ceramic stacks are evenly distributed around the first mounting hole 11 , and at least one elastic member is disposed between every two adjacent piezoelectric ceramic stacks.

It should be understood by those skilled in the art that the shapes of the first fixing member and the second fixing member of the present invention are not limited to a circle, and the cross-section of the piezoelectric ceramic stack is also not limited to a square, and the specific embodiments are not described in detail. described.

The invention creatively applies the piezoelectric ceramic stack to the optical fiber coupling adjustment device, solves the problems of insufficient adjustment precision and easy overshoot of the traditional optical fiber coupling adjustment device, and enables the optical fiber coupling adjustment device to realize fully automatic operation.

The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention. Such equivalents also fall within the scope defined by the claims appended hereto.

Claims (11)

1. An optical fiber coupling adjustment device, characterized in that, the optical fiber coupling adjustment device comprises a first fixing member, a second fixing member and a plurality of piezoelectric ceramic stacks, and a middle part of the first fixing member is provided with a mounting optical fiber The first mounting hole of the coupler, the middle of the second fixing piece is provided with a second mounting hole for installing the optical fiber, and the plurality of piezoelectric ceramics are stacked and arranged on the first fixing piece and the second fixing piece Thereby, the first firmware is driven and the optical fiber coupler installed in the first mounting hole is driven to move with three degrees of freedom. 2 . The optical fiber coupling adjustment device according to claim 1 , wherein an elastic member is provided between the first fixing member and the second fixing member, and two ends of the elastic member are respectively connected to the first fixing member. 3 . Opposing surfaces of a fixture and the second fixture. 3 . The optical fiber coupling adjustment device according to claim 1 , wherein the plurality of piezoelectric ceramic stacks are evenly arranged around the first mounting hole. 4 . 4 . The optical fiber coupling adjustment device according to claim 2 , wherein the optical fiber coupling adjustment device comprises three piezoelectric ceramic stacks, and the three piezoelectric ceramic stacks surround the first mounting hole evenly. 5 . distributed, and an elastic member is arranged between every two adjacent piezoelectric ceramic stacks. 5 . The optical fiber coupling adjustment device according to claim 2 , wherein the first fixing member is a disc member, and the first installation hole is provided at the center of the disc member, and the first installation The inner diameter of the hole is matched with the outer diameter of the optical fiber coupler, and the optical fiber coupler is fixedly installed in the first installation hole. 6 . The optical fiber coupling adjustment device according to claim 2 , wherein the second fixing member is a disc member, the second mounting hole is arranged at the center of the disc member, and the first mounting hole is located at the center of the disc. The inner diameter of the second mounting hole is larger than the outer diameter of the optical fiber. 7 . The optical fiber coupling adjustment device according to claim 1 , wherein the piezoelectric ceramic stack is connected to a power source through a wire, one end of the wire is connected to the power source, and the other end of the wire passes through the The second mounting hole is connected with the piezoelectric ceramic stack. 8 . The optical fiber coupling adjustment device according to claim 1 , wherein the first fixing member and the second fixing member are arranged concentrically, so that the first installation hole and the second installation hole are opposite to each other. 9 . allow. 9 . The optical fiber coupling adjustment device according to claim 1 , wherein the optical fiber coupling adjustment device comprises four piezoelectric ceramic stacks, and the four piezoelectric ceramic stacks surround the The first mounting holes are evenly distributed, and at least one elastic member is arranged between every two adjacent piezoelectric ceramic stacks. 10. A method for adjusting an optical fiber coupling adjustment device, the optical fiber coupling adjustment device comprising a first fixing member and a plurality of piezoelectric ceramic stacks, wherein the method comprises the following steps: Step 1: Coarsely adjust the first fixing piece so that the space light is irradiated to the center of the first fixing piece; Step 2: A certain voltage is respectively applied to the plurality of piezoelectric ceramic stacks, and the plurality of piezoelectric ceramic stacks move along the normal direction of the first fixing member under the condition of electrification, so as to realize the first step. A three-degree-of-freedom motion adjustment of a fixed piece. 11. The method according to claim 10, wherein the step 2 comprises: Applying the same voltage to the plurality of piezoelectric ceramic stacks, the displacements of the plurality of piezoelectric ceramic stacks are the same, so as to realize the adjustment of the translational degree of freedom of the first fixing member along the Z direction; When different voltages are applied to the plurality of piezoelectric ceramic stacks and the voltages satisfy a certain relationship, the adjustment of the rotational degree of freedom around the X direction or the adjustment of the rotational degree of freedom around the Y direction of the first fixing member is realized , wherein the Z direction is the normal direction of the first fixing member, and the X, Y and Z directions are perpendicular to each other.

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