Device and method for inscribing fiber period adjustable fiber grating

A technology of fiber grating and write cycle, which is applied in the direction of cladding optical fiber, optical waveguide light guide, light guide, etc., can solve the problems of limited contrast of grating stripes, high requirements for laser coherence, and high cost of fiber grating, and achieve strong resistance to external interference , High grating preparation efficiency, simple online adjustment

Active Publication Date: 2015-07-08
BEIHANG UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device and method for writing period-tunable fiber gratings by overcoming the problems of high cost for preparing fiber gratings with different

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  • Device and method for inscribing fiber period adjustable fiber grating
  • Device and method for inscribing fiber period adjustable fiber grating
  • Device and method for inscribing fiber period adjustable fiber grating

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Embodiment Construction

[0049] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] 1) Selection of laser operating wavelength, focal length of components, aperture and other parameters

[0051] The laser used for grating writing is a 193nm ArF laser with a spot diameter of about 6.5mm. In order to obtain a grating with a grid area length of 5mm, the multiple of the beam expander is 4, the focal length of the converging lens is 260mm and the size is Φ35mm, the size of the Fourier lens is 50mm and the size is Φ35mm, the focal length of the cylindrical mirror is 20mm and the size is Φ35mm, and the size of the half-transparent mirror is Φ35mm. Optical element with mirror size Φ50mm.

[0052] 2) Formation of optical path for fiber grating writing

[0053] refer to figure 2 and Figure 5 As shown, the fiber grating writing optical path includes a laser 11, a power regulator 12, a beam expander 13, a converging lens 21, ...

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Abstract

The invention discloses a device and method inscribing a fiber period adjustable fiber grating. A laser, a beam expander, a convergent lens, a semi-transparent and semi-reflective mirror, a reflector, a Fourier lens, a cylindrical mirror and the like are adopted to form a transverse shear Sagnac interference fiber grating inscribing light path, a linear interference pattern high in contrast ratio and adjustable in period is obtained and acted on a fiber core of a fiber (or other guided wave materials), and the grating is inscribed. The period of the inscribed grating can be continuously changed online by adjusting the transverse shear amount of a Sagnac interferometer, and the inscribing of the period adjustable fiber grating is achieved. Fine adjustment of the shear amount of the interferometer is achieved through a micro displacement platform, and the needed any grating period can be obtained according to an equation. The light path is adjusted easily, the requirement for the coherence of a laser light source is low, the stripe contrast ratio is high, stability is good, the grating period can be continuously adjusted online, and the problems that in an existing mask plate grating inscribing scheme, the cost for replacing a mask plate is high, and the light path is adjusted complexly are solved.

Description

technical field [0001] The invention belongs to the field of preparation of optical fiber micro-nano devices, and relates to a device and method for writing period-tunable optical fiber gratings, in particular to a method for preparing period-tunable gratings inside an optical fiber with a common optical path and low cost using Sagnac interferometer transverse shearing technology method and device thereof. Background technique [0002] Fiber Bragg grating is a structure with periodic modulation of the refractive index of the fiber core, which reflects the incident light whose wavelength satisfies the Bragg condition. The current manufacturing techniques of fiber Bragg gratings mainly include phase mask method, point-by-point writing method, double-beam interferometry and so on. The writing light sources used include ultraviolet continuous laser, ultraviolet pulse laser, infrared pulse laser and the like. The phase mask method has the characteristics of stability and repeat...

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02095G02B6/02133
Inventor 杨远洪王巧妮杨福铃陆林
Owner BEIHANG UNIV
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