Online tunable in-fiber integrated supersonic grating
An ultrasonic grating and internal integration technology, which is applied in light guides, optics, optical components, etc., can solve problems such as complex structures and cumbersome tuning methods, and achieve the effects of good wavelength selectivity, simple structure, and small device impact
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Embodiment 1
[0029] combine figure 2 (b) and image 3 , the front end of the online tunable optical fiber integrated ultrasonic grating is coupled with a fiber taper, and the rear end face is aligned with a single-core optical fiber. Because certain wavelength ultrasonic waves generated by the piezoelectric ceramic sheet form standing waves in the closed air holes in the fiber, the refractive index of the air hole filling liquid changes periodically with the standing wave intensity, and the grating is formed by delineating the fiber core.
[0030] In order to better describe the grating on 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 and pass other wavelengths of light. When the fiber taper is coupled to the single-core offset hole ultrasonic grating, the light reflection effect that meets the reflectio...
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 optical fiber is coupled with a fiber taper, and the rear end face is aligned and coupled with a double-core optical fiber or two single-core optical fibers. When the tapered optical fiber is coupled to the multi-core mesoporous optical grating provided by the present invention, multiple fiber cores can reflect a specific wavelength at the same time after passing through the optical fiber grating.
[0034] Figure 5 is the reflection spectrum of fiber gratings with different wavelengths formed by the present invention.
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