Piezoelectric ceramic rapid polarization scrambling device

Abstract

The utility model relates to the technical field, and discloses a piezoelectric ceramic rapid polarization scrambling device, which comprises piezoelectric ceramic, a single-mode optical fiber and driving voltage. The device is directly placed in an optical communication system during detection, when polarized light enters the device, the piezoelectric ceramics and the driver generate resonance to drive the optical fiber wound on the surface to stretch, so that the effect of quickly disturbing polarization is achieved, the optical fiber is wound on the two piezoelectric ceramics, a 45-degree bending angle is formed at the joint, and the detection accuracy is improved. In the same way, the three cylindrical piezoelectric ceramics are wound on the three cylindrical piezoelectric ceramics, and the two cylindrical piezoelectric ceramics are bent by 45 degrees in pairs, so that the polarization state in any direction can be regulated and controlled. After the input polarized light passes through the complete device, the output light can be detected by the Poincare ball, and theoretical calculation shows that the final output light is uniformly distributed on the surface of the Poincare ball, so that the scrambling effect is achieved, and the method can reduce the manufacturing cost and improve the scrambling speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber communication technical field especially relates to a piezoelectric ceramic fast polarization disturbance device. BACKGROUND

[0002] With the high -speed development of computer technology and communication technology, under the condition that the number of channels increases ability is limited, we are very urgent need to develop a new generation with super bandwidth, super high speed communication link, to meet the growing demand of data flow, optical fiber communication has high speed, high bandwidth, low loss, long relay, high capacity and many advantages, become the effective communication mode of solving this problem, in order to obtain more stable, efficient optical communication network, become the present key research, in the actual process of optical fiber communication system, objective factors restrict the efficiency of many optical fiber communication, in the actual communication process, due to mechanical oppression, stress, temperature and other external factors, birefringence phenomenon occurs in optical fiber. The influence produced by this birefringence phenomenon also changes with the change of external factors, which makes the polarization state of optical signal in communication link disorder. Thus polarization related losses such as polarization mode dispersion, polarization related modulation, polarization related gain, which has a great influence on the efficiency of communication system. Polarization controller is an effective measure to overcome these polarization related damages at present, which can carry out real-time polarization correction. The working principle of the disturbance device is to change the polarization state (DOP) of the polarization light passing through the disturbance device at a high speed, so that the comprehensive effect loses the polarization characteristics in the overall time period.

[0003] The polarization change speed driven by the motor in the prior art is slow, and the high-speed disturbance effect cannot be achieved. In view of the above problems, the piezoelectric ceramic fast polarization disturbance device is provided. UTILITY MODEL CONTENT

[0004] In order to make up for the above shortcomings, the piezoelectric ceramic fast polarization disturbance device is provided to improve the problems of fast disturbance speed and complex operation of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a piezoelectric ceramic fast polarization disturbance device, comprising piezoelectric ceramic, single mode optical fiber, and driving voltage, the single mode optical fiber is wound and connected to the outer surface of the piezoelectric ceramic.

[0006] As a further description of the above technical scheme:

[0007] The piezoelectric ceramic adopts a hollow cylindrical structure, the inner diameter of the piezoelectric ceramic is 31.67mm, the outer diameter is 39.09mm, the column height is 13.37mm, the material performance category of the piezoelectric ceramic is P-5H, the piezoelectric strain constant d is 186C / N, and the free dielectric constant is 4000.

[0008] As a further description of the above technical solutions:

[0009] The single-mode optical fiber is a commonly used G652 single-mode optical fiber, the front end of the single-mode optical fiber is connected with an input light source, the rear end of the single-mode optical fiber is connected with a polarization detection device, and one end of the piezoelectric ceramic is connected with a driving power supply.

[0010] As a further description of the above technical solutions:

[0011] The driving voltage III is applied to the inner diameter and the outer diameter of the columnar piezoelectric ceramic, the inner diameter is a positive electrode, and the outer diameter is a negative electrode.

[0012] As a further description of the above technical solutions:

[0013] The resonance frequency of the piezoelectric ceramic is in the range of 500-1000 KHz.

[0014] As a further description of the above technical solutions:

[0015] The number of piezoelectric ceramics 1 is three, and every two adjacent piezoelectric ceramics 1 are bent by 45 degrees.

[0016] The utility model has the following beneficial effects:

[0017] The utility model discloses a piezoelectric ceramic fast polarization disturbance device, which is directly placed in an optical communication system during detection, when polarized light is incident into the device, the piezoelectric ceramic and the driving produce resonance, drive the optical fiber wound on the surface to stretch, so that the effect of fast disturbance polarization is achieved, the optical fiber is wound on the two piezoelectric ceramics, and a bending angle of 45 degrees is manufactured at the joint, so that the polarization state in two directions can be regulated and controlled. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A piezoelectric ceramic fast polarization disturbance device is provided, and a principle schematic view of the piezoelectric ceramic fast polarization disturbance device is shown in the figure.

[0019] Figure 2 A piezoelectric ceramic fast polarization disturbance device is provided, and a principle schematic view of the piezoelectric ceramic fast polarization disturbance device is shown in the figure.

[0020] Figure 3 A piezoelectric ceramic fast polarization disturbance device is provided, and a principle schematic view of the piezoelectric ceramic fast polarization disturbance device is shown in the figure.

[0021] Figure 4A plurality of example structure schematic diagrams of the piezoelectric ceramic rapid polarization disturbance device are provided in the utility model.

[0022] Legend:

[0023] 1, piezoelectric ceramic; 2, single-mode optical fiber; 3, driving voltage; 4, input light source; 5, polarization detection device; 6, driving power supply. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] The piezoelectric principle and the stretching principle of the optical fiber are used to explain the utility model in theoretical analysis.

[0026] For piezoelectric ceramics, the piezoelectric constant refers to the coefficient of mutual coupling between stress and electric field. The greater the value, the stronger the piezoelectric effect, and the smaller the value, the weaker the piezoelectric effect. For the positive piezoelectric effect, if stress P is applied to the piezoelectric ceramic, electric energy E will be generated on the material surface, so the piezoelectric constant d is d = E / P. For the inverse piezoelectric effect, when an electric field D is applied to the piezoelectric ceramic, stress T will be generated, so the piezoelectric constant is T / D.

[0027] When the propagation speed or the length of the optical fiber changes, the phase change of the light wave is:

[0028]

[0029] In the formula: β-----the propagation constant of the light wave in the optical fiber

[0030] L-----the length of the optical fiber, m

[0031] -----the phase change of the light wave, rad

[0032] -----the phase delay caused by the change of the length of the optical fiber, that is, the strain effect of the optical fiber, rad

[0033] -----the phase delay caused by the change of the refractive index of the optical fiber, that is, the photoelastic effect, rad

[0034] -----the phase delay caused by the change of the core diameter of the optical fiber, that is, the Poisson effect, rad

[0035] Generally speaking, only 3% of the phase change, so generally often on

[0036] negligible. Therefore, the stress-strain effect of optical fiber, photoelastic effect and temperature strain effect is generally speaking the three key factors causing phase modulation,

[0037] After the stress is applied to the optical fiber, the phase modulation generated is as follows:

[0038] (1) the longitudinal strain generated by the length change of the optical fiber, which will directly affect the phase change of the light wave;

[0039] (2) the transverse strain generated by the diameter change of the optical fiber, which will change the wave number of the light wave and further cause the phase change;

[0040] (3) the photoelastic effect caused by the longitudinal and transverse strain of the optical fiber, which will change the refractive index and also cause the phase change.

[0041] When the optical fiber is subjected to external force and its length changes, the phenomenon that the phase of the light wave in the optical fiber changes is called the stress-strain effect of the optical fiber. It can be expressed by the following formula:

[0042]

[0043] In the formula, λ0 is the wavelength of the light wave propagating in the vacuum, m

[0044] n is the effective refractive index of the waveguide

[0045] ΔL is the length change of the waveguide, m

[0046] The photoelastic effect refers to the phenomenon that when external force is applied to the medium, elastic deformation occurs, and the refractive index of the optical fiber changes. Here, the properties of the light wave in the single-mode optical fiber are considered, and after calculation, the change amount of the refractive index is as follows:

[0047]

[0048] In the formula, is the photoelastic coefficient of the optical fiber

[0049] The influence of the change of the refractive index of the optical fiber on the phase delay is as follows

[0050]

[0051] The utility model discloses a simple winding technology, clear principle, novel structure, material is easy to make the device price controllable.

[0052] Referring to Figure 1The utility model provides an embodiment: a piezoelectric ceramic rapid polarization disturbance device, including piezoelectric ceramic 1, single mode optical fiber 2, with driving voltage 3, single mode optical fiber 2 is wound and is connected to the outer surface of piezoelectric ceramic 1, single mode optical fiber 2 front end connects input light source 4, rear end connects polarization detection equipment 5, and one end of piezoelectric ceramic 1 is connected driving power supply 6.

[0053] In use, in the first part, the utility model adopts 1310nm waveband laser input light source 4 to debug.Second part is the key part of the application, and the second part includes cylindrical piezoelectric ceramic 1, single mode optical fiber 2 wound on the outer surface of cylindrical piezoelectric ceramic 1, driving voltage 3 applied on the inner and outer diameters of piezoelectric ceramic 1.Single mode optical fiber 2 and cylindrical piezoelectric ceramic 1 are wound and placed closely, utilize driving power supply 6 to apply the voltage with the inherent frequency of piezoelectric ceramic 1, make piezoelectric ceramic 1 reach resonance, thereby drive single mode optical fiber 2 wound on the surface of cylindrical piezoelectric ceramic 1 to stretch, make single mode optical fiber 2 produce birefringence effect through stretching, change the polarization state of output light, reach the effect of high speed disturbance.Using the same principle, winding two or three cylindrical piezoelectric ceramic 1, can change the polarization state in any direction, reach the effect of high speed disturbance in any direction.The last block is test block, utilizes polarization detection equipment 5 such as polarization detector to detect the device effect.The preliminary experimental result shows that the polarization degree detected by the instrument reduces significantly, reduces from the polarization degree 98.8% of the beginning to about 28%.The result on bongga ball shows that the input light is disturbed, and a cocoon shape is formed in the bongga ball.

[0054] Refer to Figures 2-4 Piezoelectric ceramic 1 adopts hollow cylindrical structure, the inner diameter of piezoelectric ceramic 1 is 31.67mm, the outer diameter is 39.09mm, the column height is 13.37mm, the material performance category of piezoelectric ceramic 1 is P-5H, piezoelectric strain constant d is 186C / N, and free dielectric constant is 4000.

[0055] Driving voltage III is applied to the inner and outer diameters of cylindrical piezoelectric ceramic 1, and the inner diameter is positive, and the outer diameter is negative.

[0056] The resonance frequency of piezoelectric ceramic 1 is in the range of 500-1000KHz.

[0057] The number of piezoelectric ceramic 1 is three, and two adjacent piezoelectric ceramic 1 is bent 45 °.

[0058] In use, the driving part supplies the positive and negative electrodes of the piezoelectric ceramic with the same frequency voltage, drives the piezoelectric ceramic to resonate, and the piezoelectric ceramic expands outward and then rapidly contracts, driving the tightly wound optical fiber to expand and contract, so that the polarization of the output light of the optical fiber is rapidly changed. Two piezoelectric ceramics are connected in series with the optical fiber, the degree of polarization is further reduced, the input light is disturbed, two piezoelectric ceramics are respectively pressed, and two cocoon shapes perpendicular to each other are formed in the bongga ball. When the two piezoelectric ceramics are pressed together, it can be seen that the degree of polarization is reduced to below 5%, the bongga ball near the center of the ball rapidly and small-range disturbs, and the debugging result shows that the device achieves the effect of rapid disturbance of polarization; three piezoelectric ceramics are connected in series with the optical fiber, the joint is twisted by 45°, the input light is disturbed, and three piezoelectric ceramics are respectively pressed, three cocoon shapes perpendicular to each other are formed in the bongga ball. The effect of high-speed disturbance of polarization can be achieved in any direction.

[0059] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A piezoelectric ceramic fast polarization scrambler comprising a piezoelectric ceramic (1), a single-mode optical fiber (2), and a driving voltage (3), characterized in that: The single-mode optical fiber (2) is wound and connected to the outer surface of the piezoelectric ceramic (1).

2. A piezoelectric ceramic fast polarization perturbation device according to claim 1, characterized in that: The piezoelectric ceramic (1) adopts a hollow cylindrical structure, the inner diameter of the piezoelectric ceramic (1) is 31.67 mm, the outer diameter is 39.09 mm, the column height is 13.37 mm, the material performance category of the piezoelectric ceramic (1) is P-5H, the piezoelectric strain constant d is 186 C / N, and the free dielectric constant is 4000.

3. A piezoelectric ceramic fast polarization perturbation device according to claim 1, characterized in that: The single-mode optical fiber (2) is a commonly used G652 single-mode optical fiber, the front end of the single-mode optical fiber (2) is connected with an input light source (4), the rear end of the single-mode optical fiber (2) is connected with a polarization detection device (5), and one end of the piezoelectric ceramic (1) is connected with a driving power supply (6).

4. The piezoelectric ceramic fast polarization perturbation device of claim 1, wherein: The driving voltage (3) is spot welded on the inner and outer diameters of the columnar piezoelectric ceramic (1), the inner diameter is the positive electrode, and the outer diameter is the negative electrode.

5. The piezoelectric ceramic fast polarization perturbation device of claim 1, wherein: The resonance frequency of the piezoelectric ceramic (1) is in the range of 500-1000 KHz.

6. A piezoelectric ceramic fast polarization perturbation device according to claim 1, characterized in that: The number of the piezoelectric ceramic (1) is three, and the two adjacent piezoelectric ceramics (1) are bent by 45°.

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