Oxyhydrogen flame device for preparing spiral grating fiber

Abstract

The utility model discloses an oxyhydrogen flame device for preparing a spiral grating fiber. The oxyhydrogen flame device comprises a base station; the first displacement platform and the second displacement platform are oppositely arranged on the base platform and are used for driving an optical fiber to be processed to move; the rotating motor is arranged on the first displacement platform and is used for rotating one end of the optical fiber to be processed; the optical fiber clamp is arranged on the second displacement platform and is used for clamping the other end of the optical fiber to be processed; the flame nozzle is arranged above the gap between the first displacement platform and the second displacement platform and is used for spraying oxyhydrogen flame to the optical fiber to be processed; the hydrogen generator is communicated to the flame nozzle and is used for providing hydrogen required by combustion for the flame nozzle; and the displacement driver is connected with and controls the first displacement platform and the second displacement platform. The oxyhydrogen flame device prepares the spiral grating fiber based on oxyhydrogen flame.

Description

Technical Field

[0001] The utility model relates to the field of grating optical fibers, in particular to an oxygen-hydrogen flame device for preparing spiral grating optical fibers. Background Art

[0002] Spiral grating fiber is made by engraving a spiral around the axial direction directly on the optical fiber, and its refractive index modulation is distributed in a spiral along the axial direction of the optical fiber. This special structure makes spiral grating fiber have different optical properties from traditional grating fiber. Due to its unique spiral structure, spiral grating fiber can generate vortex light in optical fiber transmission. Vortex light has characteristics such as spiral wavefront structure, annular distribution of light intensity, certain orbital angular momentum, phase singularity, etc. It has a wide range of applications in optical information transmission, fiber lasers, optical micromanipulation and other fields. In addition, spiral grating fiber has high circular polarization characteristics, so it is widely used in the preparation of fiber polarization control devices and fiber coupling devices.

[0003] Existing spiral grating optical fibers are generally prepared by CO2 laser method, UV exposure method or arc discharge method. However, the traditional CO2 laser radiation technology and arc discharge technology cannot realize the processing of small-period spiral structures in terms of manufacturing process. The traditional UV exposure technology can meet the period requirements, but considering the low coupling coefficient of the high-order cladding mode, this method is not easy to achieve sufficiently strong mode coupling. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a hydrogen-oxygen flame device for preparing a spiral grating optical fiber based on the hydrogen-oxygen flame.

[0005] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0006] A hydrogen-oxygen flame device for preparing a spiral grating optical fiber, comprising:

[0007] abutment;

[0008] The first displacement platform and the second displacement platform are arranged on the base platform in a relative manner and are used to drive the optical fiber to be processed to move;

[0009] A rotary motor, disposed on the first displacement platform, for rotating one end of the optical fiber to be processed;

[0010] An optical fiber clamp, disposed on the second displacement platform, and used for clamping the other end of the optical fiber to be processed;

[0011] A flame spray head, arranged above the gap between the first displacement platform and the second displacement platform, for spraying hydrogen-oxygen flame toward the optical fiber to be processed;

[0012] A hydrogen generator, connected to the flame spray head, for providing the flame spray head with hydrogen required for combustion;

[0013] The displacement driver is connected to control the first displacement platform and the second displacement platform.

[0014] Furthermore, the spiral grating optical fiber is a uniform spiral grating optical fiber, and the rotary motor drives one end of the optical fiber to be processed to rotate at a uniform speed.

[0015] Furthermore, the spiral grating optical fiber is a chirped spiral grating optical fiber, and the rotary motor drives one end of the optical fiber to be processed to rotate at a variable speed.

[0016] Furthermore, there is a speed difference between the first displacement platform and the second displacement platform.

[0017] Furthermore, the oxyhydrogen flame device also includes a host computer, which is connected to control the rotating motor, the hydrogen generator and the displacement driver.

[0018] Furthermore, the first displacement platform and the second displacement platform are both linear displacement platforms, and the first displacement platform and the second displacement platform are arranged relatively to each other along a linear displacement direction.

[0019] Furthermore, the rotating motor is a stepping motor.

[0020] Furthermore, the oxyhydrogen flame device also includes a detection light source and a spectrum analyzer. The detection light source is connected to one end of the optical fiber to be processed and is used to emit a detection light beam into the optical fiber to be processed. The spectrum analyzer is connected to the other end of the optical fiber to be processed and is used to receive the detection light beam emitted from the optical fiber to be processed to obtain a processing spectrum of the optical fiber to be processed.

[0021] Furthermore, the optical fiber to be processed is a polarization-maintaining optical fiber.

[0022] Furthermore, the optical fiber to be processed is an elliptical core optical fiber.

[0023] The utility model has the following beneficial effects: the oxyhydrogen flame device of the utility model prepares spiral grating optical fiber based on oxyhydrogen flame, does not require photosensitivity optical fiber, has high processing flexibility and high efficiency, can prepare high-quality gratings with small periods, and the oxyhydrogen flame device has a series of advantages such as high processing yield, high efficiency, and good grating quality, and can efficiently batch process spiral grating optical fibers that meet the requirements in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structural principle of the hydrogen-oxygen flame device provided by the utility model.

[0025] Figure 2The utility model provides a schematic diagram of the connection structure between the detection light source and the spectrum analyzer in the oxyhydrogen flame device and the optical fiber to be processed. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] like Figure 1 As shown, a hydrogen-oxygen flame device for preparing a spiral grating optical fiber comprises:

[0032] Abutment 1;

[0033] The first displacement platform 2 and the second displacement platform 3 are arranged on the base 1 relatively to each other and are used to drive the optical fiber 10 to be processed to move;

[0034] A rotary motor 4, disposed on the first displacement platform 2, for rotating one end of the optical fiber 10 to be processed;

[0035] An optical fiber clamp 5, disposed on the second displacement platform 3, and used for clamping the other end of the optical fiber 10 to be processed;

[0036] A flame spray head 6, disposed above the gap between the first displacement platform 2 and the second displacement platform 3, for spraying hydrogen-oxygen flame toward the optical fiber 10 to be processed;

[0037] A hydrogen generator 7, connected to the flame nozzle 6, for providing the flame nozzle 6 with hydrogen required for combustion;

[0038] The displacement driver 8 is connected to control the first displacement platform 2 and the second displacement platform 3 .

[0039] The oxyhydrogen flame device of the utility model prepares spiral grating optical fiber based on oxyhydrogen flame, does not need photosensitivity optical fiber, has high processing flexibility and high efficiency, can prepare high-quality gratings with small period, and the oxyhydrogen flame device has a series of advantages such as high processing yield, high efficiency, good grating quality, etc., and can efficiently batch process spiral grating optical fibers that meet the requirements in a short time.

[0040] When preparing the spiral grating optical fiber, the steps are as follows:

[0041] Step 2: Clamp one end of the optical fiber 10 to be processed in the optical fiber clamp 5, connect the other end of the optical fiber 10 to be processed to the rotating motor 4, and strip the coating of the middle part of the optical fiber 10 to be processed to expose its optical fiber cladding.

[0042] In step 2, the coating layer is retained at both ends of the optical fiber 10 to be processed so as to be fixed to the optical fiber clamp 5 and the rotating motor 4 respectively. The part to be processed from which the coating layer has been stripped is repeatedly wiped clean with alcohol paper to leave no residue, thereby ensuring the processing quality.

[0043] Step 3: Start the hydrogen generator 7 to introduce hydrogen into the flame nozzle 6, so that the flame nozzle 6 ignites and sprays out a hydrogen-oxygen flame, and at the same time start the first displacement platform 2 and the second displacement platform 3 to drive the optical fiber 10 to be processed to move back and forth relative to the flame nozzle 6, so as to evenly heat the portion to be processed of the optical fiber 10 to be processed, so that the portion to be processed of the optical fiber 10 to be processed is melted.

[0044] In step 3, the hydrogen flow rate of the hydrogen generator 7 needs to be set to a value that can melt the optical fiber 10 to be processed, which requires adjusting the height of the flame nozzle 6 in combination with the hydrogen flow rate.

[0045] Step 4: Start the rotating motor 4 to drive one end of the optical fiber 10 to be processed to rotate, so that the portion of the optical fiber 10 to be processed forms the spiral grating optical fiber.

[0046] In step 4, there should be a certain speed difference between the first displacement platform 2 and the second displacement platform 3, so that the optical fiber 10 to be processed will not collapse during the processing.

[0047] When the prepared spiral grating fiber is a uniform spiral grating fiber, that is, the period of the spiral grating fiber is constant, the rotating motor 4 drives one end of the optical fiber 10 to be processed to rotate at a uniform speed; when the prepared spiral grating fiber is a chirped spiral grating fiber, that is, the period of the spiral grating fiber changes, the rotating motor 4 drives one end of the optical fiber 10 to be processed to rotate at a variable speed.

[0048] Note that when the rotation speed of the rotating motor 4 reaches above 2000 rpm, it is necessary to set a suitable rotation acceleration to enable the rotating motor 4 to achieve rapid acceleration and start and stop.

[0049] After completing the preparation of the spiral grating optical fiber, the optical fiber 10 to be processed is removed, and the two ends of the optical fiber 10 to be processed are cut off according to the required length, leaving only the spiral grating optical fiber of the required length, and then the two ends of the spiral grating optical fiber are respectively connected to the detection light source 11 and the spectrum analyzer 12 to observe whether its spectral characteristics meet the requirements.

[0050] The oxyhydrogen flame device further comprises a host computer 9 , which is connected to control the rotary motor 4 , the hydrogen generator 7 and the displacement driver 8 .

[0051] The host computer 9 is generally a computer or an industrial computer, and is used to set corresponding processing parameters according to the grating parameters of the spiral grating optical fiber.

[0052] When preparing the spiral grating optical fiber, before step 2, the method further includes:

[0053] Step 1: Setting the processing parameters of the spiral grating optical fiber.

[0054] In this step 1, in the host computer 9, the processing parameters are preset according to the grating parameters of the spiral grating optical fiber, and the processing parameters include the starting speed, ending speed and rotation acceleration of the rotating motor 4, the displacement speed of the first displacement platform 2 and the second displacement platform 3, the hydrogen flow rate of the hydrogen generator 7 and the processing time, etc., and then click Initialize, and the hydrogen-oxygen flame device is ready.

[0055] In this embodiment, the first displacement platform 2 and the second displacement platform 3 are both linear displacement platforms, and the first displacement platform 2 and the second displacement platform 3 are arranged relatively along the linear displacement direction; the rotary motor 4 is a stepping motor.

[0056] Taking the preparation of the chirped spiral grating fiber as an example, the starting speed and the ending speed of the rotating motor 4 are V1=1.32 mm / s and V2=1.4 mm / s respectively, the acceleration time is T=260s, the initial maximum period of the chirped spiral grating fiber is Λ1=21 mm, and the ending minimum period is Λ2=165.4 μm, and its grating period gradually decreases along the direction of light transmission.

[0057] like Figure 2 As shown, the oxyhydrogen flame device also includes a detection light source 11 and a spectrum analyzer 12. The detection light source 11 is connected to one end of the optical fiber to be processed 10 and is used to emit a detection light beam into the optical fiber to be processed 10. The spectrum analyzer 12 is connected to the other end of the optical fiber to be processed 10 and is used to receive the detection light beam emitted from the optical fiber to be processed 10 to obtain a processing spectrum of the optical fiber to be processed 10.

[0058] During the process of preparing the spiral grating optical fiber, the detection light source 11 is controlled to emit a detection light beam into the optical fiber to be processed 10, and the spectrum analyzer 12 is controlled to receive the detection light beam emitted from the optical fiber to be processed 10. The processing progress of the spiral grating optical fiber is monitored according to the processing spectrum of the optical fiber to be processed 10. When the processing spectrum is the required spectrum, the processing of the spiral grating optical fiber can be stopped.

[0059] In this embodiment, the optical fiber 10 to be processed is a polarization-maintaining optical fiber. Preferably, the optical fiber 10 to be processed is an elliptical core optical fiber. The elliptical core optical fiber is a special polarization-maintaining optical fiber whose core cross-section is elliptical instead of the traditional circular shape. The elliptical core structure can give the spiral grating optical fiber greater birefringence and polarization maintenance capabilities.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A hydrogen-oxygen flame device for preparing spiral grating optical fiber, characterized in that: include: abutment; The first displacement platform and the second displacement platform are arranged on the base platform in a relative manner and are used to drive the optical fiber to be processed to move; A rotary motor, disposed on the first displacement platform, for rotating one end of the optical fiber to be processed; An optical fiber clamp, disposed on the second displacement platform, and used for clamping the other end of the optical fiber to be processed; A flame spray head, arranged above the gap between the first displacement platform and the second displacement platform, for spraying hydrogen-oxygen flame toward the optical fiber to be processed; A hydrogen generator, connected to the flame spray head, for providing the flame spray head with hydrogen required for combustion; The displacement driver is connected to control the first displacement platform and the second displacement platform.

2. The oxyhydrogen flame device according to claim 1, characterized in that: The spiral grating optical fiber is a uniform spiral grating optical fiber, and the rotary motor drives one end of the optical fiber to be processed to rotate at a uniform speed.

3. The oxyhydrogen flame device according to claim 1, characterized in that: The spiral grating optical fiber is a chirped spiral grating optical fiber, and the rotary motor drives one end of the optical fiber to be processed to rotate at a variable speed.

4. The oxyhydrogen flame device according to claim 1, characterized in that: There is a speed difference between the first displacement platform and the second displacement platform.

5. The oxyhydrogen flame device according to claim 1, characterized in that: The oxyhydrogen flame device further comprises a host computer, which is connected to control the rotating motor, the hydrogen generator and the displacement driver.

6. The oxyhydrogen flame device according to claim 1, characterized in that: The first displacement platform and the second displacement platform are both linear displacement platforms, and the first displacement platform and the second displacement platform are arranged opposite to each other along a linear displacement direction.

7. The oxyhydrogen flame device according to claim 1, characterized in that: The rotating motor is a stepping motor.

8. The oxyhydrogen flame device according to claim 1, characterized in that: The oxyhydrogen flame device also includes a detection light source and a spectrum analyzer. The detection light source is connected to one end of the optical fiber to be processed and is used to emit a detection light beam into the optical fiber to be processed. The spectrum analyzer is connected to the other end of the optical fiber to be processed and is used to receive the detection light beam emitted from the optical fiber to be processed to obtain a processing spectrum of the optical fiber to be processed.

9. The oxyhydrogen flame device according to claim 1, characterized in that: The optical fiber to be processed is a polarization-maintaining optical fiber.

10. The oxyhydrogen flame device according to claim 1, characterized in that: The optical fiber to be processed is an elliptical core optical fiber.

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