Optical fiber and piezoelectric ceramic combined double-PZT optical fiber phase modulator

Abstract

The utility model relates to an optical fiber and piezoelectric ceramic combined double-PZT optical fiber phase modulator, which comprises a fixed seat, one side of the fixed seat is connected with an optical fiber winding seat, the optical fiber winding seat is provided with a radial opening, the outer side of the radial opening is provided with an installation bayonet, and the installation bayonet is connected with the optical fiber winding seat. Two piezoelectric ceramics are sequentially mounted at the mounting bayonet in the thickness direction of the optical fiber winding seat, an electrode is attached to the surface of each piezoelectric ceramic, the electrodes are connected to an external control power supply through wires, and a single-mode optical fiber bypasses the piezoelectric ceramics and is sequentially wound on the optical fiber winding seat; and the input end and the output end of the single-mode optical fiber are respectively positioned by the fixed seat and then are connected with the interferometer. The optical fiber and piezoelectric ceramic combined double-PZT optical fiber phase modulator has the advantages of simple structure, high reliability, high sensitivity, high interference visibility and the like.

Description

Technical Field

[0001] The utility model relates to the field of optical fiber sensing, in particular to a double PZT optical fiber phase modulator combining optical fiber and piezoelectric ceramics. Background Art

[0002] The Mach-Zehnder interferometer (MZI) is a classic optical interferometer widely used to measure small changes in physical quantities. All-fiber MZ interferometers utilize optical fibers instead of the optical components in traditional interferometers, resulting in advantages such as high sensitivity, immunity to electromagnetic interference, compact size, and ease of distributed measurement. However, existing fiber-optic interferometers often suffer from complex structures, poor stability, poor environmental adaptability, and an inability to achieve precise control.

[0003] To improve the performance of fiber-optic interferometers, the introduction of piezoelectric ceramics (PZT) offers an effective solution. PZT exhibits electromechanical coupling, enabling its deformation to be controlled by applying voltage, thereby finely adjusting the fiber length and achieving phase modulation of the optical signal. However, existing fiber-PZT combinations still suffer from limitations such as a limited adjustment range and low sensitivity. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a dual-PZT optical fiber phase modulator combining optical fiber and piezoelectric ceramics, which has the advantages of simple structure, high reliability, high sensitivity, high interference visibility, etc.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramics includes a fixed base, one side of which is connected to a fiber winding base, the fiber winding base being provided with a radial opening, the outer side of which is formed with a mounting bayonet, two piezoelectric ceramics being sequentially mounted at the mounting bayonet along the thickness direction of the fiber winding base, each piezoelectric ceramic having an electrode attached to its surface, the electrodes being connected to an external control power supply via a wire, a single-mode optical fiber being wound around the piezoelectric ceramics in sequence, and the input and output ends of the single-mode optical fiber being positioned by the fixed base and then connected to an interferometer.

[0007] Furthermore, the radial opening is arranged to extend beyond the center of the optical fiber winding seat.

[0008] Furthermore, the radial opening is U-shaped.

[0009] Furthermore, the optical fiber winding seat is also provided with a lightweight hole.

[0010] Furthermore, the input end and the output end of the single-mode optical fiber are respectively fixed to the fixing seat by a clamp or an adhesive.

[0011] Furthermore, the fixing seat is provided with a mounting hole.

[0012] The utility model adopts the above technical solution, and has the following advantages:

[0013] 1. It adopts dual piezoelectric ceramic (PZT) design, which has great flexibility and reliability.

[0014] First, by connecting two piezoelectric ceramics in parallel, the optical path adjustment range of the optical fiber can be effectively increased. Specifically, each PZT will produce a slight deformation by applying a voltage, and the deformation is transmitted to the optical fiber connected to it through elastic coupling, thereby changing the length or bending degree of the optical fiber, and thus achieving modulation of the optical fiber phase. Using two PZTs in parallel means that the total optical path adjustment amplitude of the optical fiber can be significantly increased, which is very useful for applications that require a longer adjustment range, especially in long-distance fiber interference systems. By increasing the optical path, a more sensitive phase modulation effect can be obtained. Therefore, when it is necessary to increase the optical path length or multiply the optical path, the dual PZT design can greatly improve the adjustment capability of the system.

[0015] Secondly, the dual piezoelectric ceramic design allows users to use any one of the PZTs alone to meet the phase adjustment requirements of the optical fiber. Specifically, when a smaller optical path adjustment is required, only one of the PZTs needs to be used to complete the corresponding operation, thereby reducing power consumption and simplifying the control system. The other PZT component can be retained as a backup. Because the design retains redundant piezoelectric ceramics, when one of the PZT components fails or is damaged, the user can ensure the normal operation of the system by activating the backup PZT without disassembling the entire system. This greatly simplifies the maintenance process, extends the service life of the system, and reduces maintenance costs. For fiber optic sensing systems, maintaining system stability and continuity is crucial, and the dual PZT structure provides an efficient backup mechanism.

[0016] 2. The dual piezoelectric ceramic design has the design advantage of doubling the optical fiber path and length.

[0017] The dual-PZT design doubles the effective length and optical path of the optical fiber, significantly enhancing system sensitivity and expanding the measurement range of fiber interferometers. In this structure, the optical fiber is wound around the piezoelectric ceramic. This multiple winding method effectively increases the effective length of the fiber. Combined with the deformation adjustment capability of the dual-PZT, the fiber length can be adjusted over a wider range. For interferometer systems, the effective length of the optical fiber is closely related to the modulation sensitivity of the optical signal. Increasing the fiber length directly results in a larger phase difference, improving the sensitivity of the interference signal. This increased optical path means that the same optical signal interferes over a longer path, increasing the phase variation of the system and enhancing the sensor's accuracy. In scenarios where weak signal changes need to be detected, this optical path doubling design significantly improves overall system performance.

[0018] 3. The optical fiber phase modulator of the present application also has the advantage of a simple structure.

[0019] 4. The optical fiber phase modulator of the present application has broad application prospects in the field of optical fiber sensors and can play an important role in the measurement of various physical quantities such as small displacement, temperature, and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the unwound single-mode optical fiber of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure after winding single-mode optical fiber.

[0022] In the figure, 1. fixing seat, 2. optical fiber winding seat, 3. radial opening, 4. piezoelectric ceramic, 5. wire, 6. single-mode optical fiber, 7. mounting hole, 8. lightweight hole. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0024] like Figure 1-2As shown, in this embodiment, the dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramics includes a fixed base 1, one side of the fixed base 1 is connected to a fiber winding base 2, the fiber winding base 2 is provided with a radial opening 3, the outer side of the radial opening 3 is formed with a mounting bayonet, and two piezoelectric ceramics 4 are installed in sequence at the mounting bayonet along the thickness direction of the fiber winding base 2, each piezoelectric ceramic 4 is attached with an electrode on the surface, and the electrode is connected to an external control power supply through a wire 5, a single-mode optical fiber 6 bypasses the piezoelectric ceramic 4 and is wound on the fiber winding base 2 in sequence, specifically, a groove is provided on the fiber winding base 2 for winding the single-mode optical fiber, and the energy transmission optical fiber is tightly wound on the outer surface of the fiber winding base and fixed by gluing, and the input end and the output end of the single-mode optical fiber 6 are respectively positioned by the fixed base 1 and connected to the interferometer.

[0025] Working Principle: The piezoelectric ceramic 4 is fixed to the mounting bracket of the radial opening 3. When voltage is applied to it, the piezoelectric ceramic will produce a slight mechanical deformation. This deformation affects the physical length or curvature of the optical fiber through the coupling between the optical fiber winding seat and the optical fiber, thereby changing the phase of the light wave in the optical fiber. In other words, by controlling the tiny displacement of the piezoelectric ceramic, the tiny displacement of the wound optical fiber can be precisely controlled. The dual piezoelectric ceramic design can be used in parallel to effectively increase the optical path adjustment range of the optical fiber, and a one-in-one backup mechanism can also be used. The advantages of the above modulation method are its flexibility and high-precision control, which can achieve high-precision phase adjustment of the optical signal.

[0026] The above structure can be used to construct an all-fiber MZ interferometer. Two optical input signals enter the interferometer via optical fibers. One optical signal passes through a fiber phase modulator with a dual PZT structure. The interference signal at the output is read by a fiber detector. By adjusting the voltage applied by the PZT, the phase of the optical fiber in the interferometer arm changes, which in turn affects the interference pattern, ultimately enabling the measurement of tiny physical quantities.

[0027] As for the optical fiber winding seat, after the piezoelectric ceramic produces mechanical deformation, its radial opening will also become larger. Therefore, the optical fiber winding seat can be made of, but not limited to, conventional materials such as aluminum and resin, as long as it has a certain elasticity and can return to its original position when no voltage is applied.

[0028] In one specific embodiment, the input end and the output end of the single-mode optical fiber 6 are fixed to the fixing base 1 by clamps or adhesives. Such a setting can ensure the precise control of the length and bending of the optical fiber, thereby facilitating the formation of a stable interference optical path.

[0029] In one specific embodiment, the radial opening 3 is arranged beyond the center of the optical fiber winding seat 2 to facilitate the deformation of the piezoelectric ceramic after pressure is applied.

[0030] In one specific embodiment, the radial opening 3 is U-shaped.

[0031] In one specific embodiment, the optical fiber winding seat 2 is further provided with a lightweight hole 8 .

[0032] In one specific embodiment, a mounting hole 7 is provided on the fixing base 1 .

[0033] The above specific implementation methods cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or transformation made to the implementation methods of the present utility model falls within the protection scope of the present utility model.

[0034] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. A dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramics, characterized in that: It includes a fixing seat, one side of which is connected to a fiber winding seat, a radial opening is provided on the fiber winding seat, and a mounting bayonet is formed on the outer side of the radial opening. Two piezoelectric ceramics are sequentially mounted on the mounting bayonet along the thickness direction of the fiber winding seat, and an electrode is attached to the surface of each piezoelectric ceramic. The electrode is connected to an external control power supply through a wire. A single-mode optical fiber bypasses the piezoelectric ceramic and is sequentially wound on the fiber winding seat. The input end and output end of the single-mode optical fiber are respectively positioned by the fixing seat and connected to the interferometer.

2. The dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramic according to claim 1, characterized in that: The radial opening is arranged to extend beyond the center of the optical fiber winding seat.

3. The dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramic according to claim 1, characterized in that: The radial opening is U-shaped.

4. The dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramic according to claim 1, characterized in that: The optical fiber winding seat is also provided with a lightweight hole.

5. The dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramic according to claim 1, characterized in that: The input end and the output end of the single-mode optical fiber are respectively fixed on the fixing seat by means of a clamp or adhesive.

6. The dual-PZT fiber phase modulator combining optical fiber and piezoelectric ceramic according to claim 1, characterized in that: The fixing seat is provided with a mounting hole.

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