An online tunable ultrasonic grating integrated in fiber

An ultrasonic grating and internal integration technology, applied in light guides, optics, optical components, etc., can solve problems such as cumbersome tuning methods and complex structures, and achieve the effects of simple structure, good wavelength selectivity, and broad development prospects

CN109143468BActive Publication Date: 2020-06-16HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-16

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Abstract

The invention provides an online tunable in-fiber integrated supersonic grating, and belongs to the technical field of fiber sensing and fiber communication. A fiber, an air vent, an air vent fillingliquid and a supersonic wave source are included, the air vent is positioned in the fiber and filled with the air vent filling liquid, the supersonic wave source is attached to the surface of the fiber, supersonic waves generated by the supersonic wave source spread in the air vent filling liquid to form standing waves, the refractive index of the liquid is distributed periodically according to weakness via intensity change of the supersonic waves, a grating whose period is related to the supersonic wave length is formed in the axial direction of the fiber, and a light beam in a fiber core canbe tuned and filtered online via the supersonic wave length. The online tunable in-fiber integrated supersonic grating has the advantages of small size, high wavelength selectivity, high coupling performance, easy tuning and low cost, can be compatible with fiber function devices, and can be used for in-fiber integration of a photonic device and system.
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Description

technical field

[0001] The invention belongs to the technical field of optical fiber sensing and optical fiber communication, in particular to an on-line tunable integrated ultrasonic grating in an optical fiber. Background technique

[0002] Fiber grating is a new type of fiber photonic device made by using the photosensitive effect of doped fiber to produce periodic changes in the refractive index along the length of the fiber core. The fiber grating forms a certain periodic refractive index distribution along the axis of the fiber, so that it can coherently reflect the phase-matched frequencies in the incident light, forming a central reflection peak, which is similar to a narrow-band filter centered on the resonant wave. The continuous development of optical fiber technology has also promoted in-depth research on optical fiber integration at home and abroad. Integrating various active and passive devices into the optical fiber can greatly reduce the size and weight of th...

Examples

Embodiment 1

[0029] combine figure 2 (b) and image 3 , the front end of the integrated ultrasonic grating in the online tunable fiber is coupled with a fiber taper, and the rear end face is aligned and coupled with a single-core fiber. Due to the ultrasonic waves of certain wavelengths generated by the piezoelectric ceramic sheet, standing waves are formed in the closed air holes in the fiber, so that the refractive index of the air hole filling liquid changes periodically with the intensity of the standing waves, and the grating is formed by characterization of the fiber core.

[0030] In order to better describe the grating of the fiber core, a plurality of identical closed air holes can be surrounded around the fiber core. When broad-spectrum light passes through the grating region from the fiber core, the fiber grating will reflect specific wavelengths, allowing other wavelengths of light to pass. When the selected fiber taper is coupled to the single-core polarized hole ultrasonic...

Embodiment 2

[0032] Same as Example 1, the main difference is:

[0033] combine figure 2 (c) and Figure 4 , the front end of the integrated ultrasonic grating in the online tunable fiber is coupled with a fiber taper, and the rear end face is aligned to couple a double-core fiber or two single-core fibers. When the selected fiber taper is coupled to the multi-core mesoporous optical grating provided by the present invention, after passing through the fiber grating, multiple fiber cores can reflect a specific wavelength at the same time.

[0034] Figure 5 is the reflection spectrum of fiber gratings with different wavelengths formed by the present invention.