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CN-122018076-A - Tunable optical fiber based on optofluidic control and manufacturing method

CN122018076ACN 122018076 ACN122018076 ACN 122018076ACN-122018076-A

Abstract

The invention discloses a tunable optical fiber based on optical flow control and a manufacturing method thereof, belonging to the field of optical fiber communication. A tunable optical fiber based on optofluidic control comprises an optical fiber main body, wherein the optical fiber main body comprises a fiber core and a cladding, the optical fiber main body is divided into an input section and an output section, a tuning section is arranged between the input section and the output section, first micropores penetrating through and parallel to the optical fiber main body are formed in the cladding of the input section and the output section, second micropores penetrating through and parallel to the axial direction of the optical fiber main body are formed in the tuning section, two ends of the tuning section are respectively welded with the input section and the output section, the second micropores are positioned between the fiber cores of the input section and the output section and are used for forming a Fabry-Perot cavity, and liquid mediums with different refractive indexes are injected into the second micropores, so that the optical length of the Fabry-Perot cavity between the input section and the tuning section is changed, and tuning of output wavelength is realized.

Inventors

  • LI KEYI
  • ZHANG YANG

Assignees

  • 艾迪科技(山东)有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (8)

  1. 1. The tunable optical fiber based on the optofluidic control is characterized by comprising an optical fiber main body (1), wherein the optical fiber main body (1) comprises a fiber core (101) and a cladding (102), the optical fiber main body (1) is divided into an input section (10) and an output section (12), and a tuning section (11) is arranged between the input section (10) and the output section (12); A first micropore (103) penetrating through and parallel to the optical fiber main body (1) is formed in the cladding (102) of the input section (10) and the output section (12), a second micropore (104) penetrating through and parallel to the axial direction of the optical fiber main body (1) is formed in the tuning section (11), two ends of the tuning section (11) are respectively welded with the input section (10) and the output section (12), the second micropore (104) is positioned between the fiber cores (101) of the input section (10) and the output section (12) and is used for forming a Fabry-Perot cavity, The first micropores (103) are communicated with the second micropores (104), the first micropores (103) and the second micropores (104) are the same in size and are cylindrical, the central axes of the first micropores (103) and the second micropores (104) are staggered by a first distance, and the first distance meets the following constraint: D/3 is less than or equal to DeltaL is less than or equal to D/2, and L/40 is less than or equal to DeltaL is less than or equal to L/20; wherein D is the diameter of the first microwell (103) or the second microwell (104), deltaL is the first distance, and L is the length of the second microwell (104).
  2. 2. The tunable optical fiber based on the optofluidic control according to claim 1, wherein the optical fiber main body (1) further comprises an injection section (13), the injection section (13) is welded at one end of the output section (12) far away from the tuning section (11), one end of the injection section (13) close to the output section (12) is provided with a grinding inclined plane, the first micro hole (103) is aligned with an air section formed by the grinding inclined plane, and an included angle between the grinding inclined plane and the axial direction of the optical fiber main body (1) meets the following constraint condition: θ = arctan(14ΔL/L); Where ΔL is the first distance and L is the length of the second microwells (104).
  3. 3. A tunable optical fiber based on optofluidic control according to claim 2, characterized in that the angle between the grinding chamfer and the axial direction of the optical fiber body (1) is 20 ° -35 °.
  4. 4. A tunable optical fiber based on optical flow control according to claim 1, wherein said first distance is 9-15 microns.
  5. 5. A tunable optical fiber based on optofluidic control according to claim 1, wherein the second micro-holes (104) have a length of 300-350 μm.
  6. 6. The tunable optical fiber based on the optical flow control according to claim 2, wherein the grinding inclined plane is connected with a quartz capillary tube perpendicular to the axial direction of the optical fiber main body (1), and the other end of the quartz capillary tube is connected with a needle tube controlled by a micro-flow pump.
  7. 7. The tunable optical fiber based on optical flow control according to claim 1, wherein the input section (10) and the output section (12) are provided with 30-50nm gold films at the opposite ends.
  8. 8. A method for manufacturing a tunable optical fiber based on optical flow control, which is applied to the tunable optical fiber based on optical flow control as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps: S1, a first micropore (103) and a second micropore (104) which are symmetrical relative to a fiber core (101) are formed in a cladding (102) of an optical fiber main body (1), and the distance between the central axes of the first micropore (103) and the second micropore (104) and the central axis of the fiber core (101) is 25 microns; s2, dividing the optical fiber main body (1) into three sections, namely an input section (10), a tuning section (11) and an output section (12) in sequence; s3, plating a 30-50nm gold film on the end surfaces of the input section (10) and the output section (12); S4, moving the tuning section (11) along the direction from the second micropore (104) to the first micropore (103), and keeping the input section (10) and the output section (12) motionless, so that the central axis of the second micropore (104) on the tuning section (11) moves to a position 9-15 microns below the central axes of the first micropore (103) on the input section (10) and the output section (12); S5, respectively welding end surfaces of the gold-plated films of the input section (10) and the output section (12) at two ends of the tuning section (11); s6, welding an injection section (13) with an grinding inclined plane at one end of the output section (12) far away from the tuning section (11); and S7, vertically welding the quartz capillary at the grinding inclined plane of the injection section (13) so that the quartz capillary is communicated with the first micropore (103) on the output section (12).

Description

Tunable optical fiber based on optofluidic control and manufacturing method Technical Field The invention relates to the field of optical fiber communication, in particular to a tunable optical fiber based on optical flow control and a manufacturing method thereof. Background The tunable optical fiber device is used as a core functional element of a modern photon system, and the flexible wavelength regulation and control capability of the tunable optical fiber device directly influences the transmission capacity of an optical communication network, the detection precision of an optical fiber sensing system and the working performance of a spectrum analysis instrument. In the field of fiber lasers, the tunable fiber not only determines the wavelength range and stability of output laser, but also is a key for realizing narrow linewidth and low-noise laser output. For example, the thermo-optic tuning mechanism utilizes the thermo-optic effect of doped fibers or polymer fibers to change the refractive index of the core by external temperature control, thereby achieving bragg wavelength drift. The device has a simple structure, but the tuning response is limited by a thermal diffusion process and is usually in the order of hundreds of milliseconds, and the device has the problems of poor thermal stability, high power consumption, easiness in thermal drift during long-term working and the like, so that the application requirement of high-speed dynamic tuning is difficult to meet. The conventional tunable fiber technology is difficult to consider in key indexes such as response speed, tuning range, insertion loss, long-term stability, system integration level and the like, and particularly, the conventional tunable fiber technology lacks an effective technical scheme in the aspects of realizing controllable micropore communication at an optical fiber fusion interface and constructing a tunable structure of optical-flow cooperative integration. In view of this, we propose a tunable optical fiber based on optofluidic control and a method of manufacturing. Disclosure of Invention 1. Technical problem to be solved The invention aims to provide a tunable optical fiber based on optofluidic control and a manufacturing method thereof, so as to solve the problems in the background technology. 2. Technical proposal The invention is realized by the following technical scheme: The tunable optical fiber based on the optofluidic control comprises an optical fiber main body, wherein the optical fiber main body comprises a fiber core and a cladding, the optical fiber main body is divided into an input section and an output section, and a tuning section is arranged between the input section and the output section; the cladding of the input section and the output section is internally provided with a first micropore which penetrates and is parallel to the optical fiber main body, the tuning section is provided with a second micropore which penetrates and is parallel to the axial direction of the optical fiber main body, two ends of the tuning section are respectively welded with the input section and the output section, the second micropore is positioned between fiber cores of the input section and the output section and is used for forming a Fabry-Perot cavity, The first micropore is communicated with the second micropore, the first micropore and the second micropore are the same in size and are all cylindrical, the central axes of the first micropore and the second micropore are staggered by a first distance, and the first distance meets the following constraint: D/3 is less than or equal to DeltaL is less than or equal to D/2, and L/40 is less than or equal to DeltaL is less than or equal to L/20; wherein D is the diameter of the first or second micropores, deltaL is the first distance, and L is the length of the second micropores. As an alternative to the technical solution of the present disclosure, the optical fiber main body further includes an injection section, the injection section is welded at an end of the output section away from the tuning section, an end of the injection section near the output section has a polishing bevel, the first micro hole is aligned with an air cross section formed by the polishing bevel, and an included angle between the polishing bevel and an axial direction of the optical fiber main body meets the following constraint conditions: θ = arctan(14ΔL/L); Wherein Δl is the first distance and L is the length of the second microwell. As an alternative to the technical scheme of the application, the included angle between the grinding inclined plane and the axial direction of the optical fiber main body is 20-35 degrees. As an alternative to the solution of the present document, the first distance is 9-15 micrometers. As an alternative to the technical solution of the present application, the length of the second microwells is 300-350 micrometers. As an alternative scheme of the technical scheme of