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Quasi-rectangular multi-core polarization-maintaining optical fiber and manufacturing method thereof

A polarization-maintaining optical fiber and manufacturing method technology, which is applied to polarization optical fibers, cladding optical fibers, manufacturing tools, etc., can solve the problems of large device size and unsuitable optical integration, and achieve the effect of reducing volume, optimizing geometry, and improving performance.

Inactive Publication Date: 2012-02-01
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ribbon-shaped polarizing fiber involved in the invention patent application "ribbon polarizing fiber and its manufacturing method and its array of polarizing optical fibers" (publication number: CN 1361437A) is composed of a plurality of independent polarization-maintaining optical fibers arranged in a straight line. It is not a multi-core fiber in the true sense, and the size of the device is also large, which is not suitable for optical integration

Method used

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  • Quasi-rectangular multi-core polarization-maintaining optical fiber and manufacturing method thereof
  • Quasi-rectangular multi-core polarization-maintaining optical fiber and manufacturing method thereof
  • Quasi-rectangular multi-core polarization-maintaining optical fiber and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The circular fiber core and hollow and solid cladding preforms of different sizes are manufactured by chemical vapor deposition process, and the large-size hollow cladding preform 7 is set outside the solid cladding preform 6 by using the sleeve method, and the two are concentric , the difference between the inner diameter of the hollow tube and the outer diameter of the solid rod is the length of the minor axis of the rectangular fiber core, and an annular air layer is formed between them; the fiber cores are symmetrically arranged in the annular air layer, and each fiber core is composed of two fiber core prefabricated rods 4 , and the other gaps are filled with cladding preform rods 5 of the same size as the mandrel rods; conventional methods are used for wire drawing, coating, and the wire drawing process needs to be pumped and inflated. The substantially rectangular multi-core polarization-maintaining fiber shown in Fig. 1(a), Fig. 2(a) and Fig. 3(a) will be drawn. ...

Embodiment 2

[0029] The circular fiber core and hollow and solid clad preform rods of different sizes are manufactured by chemical vapor deposition process. The inner diameter of the hollow clad preform rod 7 is equal to the outer diameter of the solid clad preform rod 6. The solid clad preform rod 6 is vertically and horizontally The cutting machine cuts shallow grooves 8 on the symmetrical longitudinal side according to the size of the fiber core. The preforms after slotting must be strictly cleaned with ion water and dried with inert gas. Outside the layer preform 6, the core preform is ground into a rectangular structure 11 with a shallow groove 8, and then embedded in the groove 8 of the cladding preform; conventional methods are used for drawing and coating, and the drawing process needs to be pumped and inflated. The quasi-rectangular multi-core polarization-maintaining fiber shown in Fig. 1(a), Fig. 2(a) and Fig. 3(a) will also be drawn.

[0030] In order to improve the polarizatio...

Embodiment 3

[0032] The structure of the quasi-rectangular dual-core polarization-maintaining fiber is shown in Figure 7 and Figure 8 As shown in Fig. 7(a), the dual-core polarization-maintaining fiber is composed of two rectangular optical fiber cores 1, the shape of the optical fiber core is rectangular, and the two rectangular cores are arranged in parallel. Two air holes 12 are symmetrically placed near each rectangular core to improve the polarization maintaining capability, and the polarization direction of the fiber in Fig. 7(b) is orthogonal to Fig. 7(a); Figure 8 The dual core polarization maintaining fiber has a periodic structure 13 in the cladding 2 .

[0033] Similar to Example 1, the core and cladding filled preforms of different sizes are manufactured by chemical vapor deposition process, and the refractive index of the cladding filling preforms is not completely the same, and the core preform is ground into a rectangular structure 11, According to the predetermined shape...

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Abstract

The invention provides a rectangular multi-core polarization-maintaining optical fiber and a manufacturing method thereof. The optical fiber includes a plurality of cores, the cores are in a rectangular structure, the cladding can be a uniform material or a periodic structure, and air holes can be set near the cores to increase the polarization maintaining capability. The characteristics of the present invention are: 1. The method of changing the geometric shape is used to control the polarization state of light, which belongs to the geometric structure polarization maintaining optical fiber; 2. The temperature stability is good; 3. Multiple cores are integrated into one optical fiber, which can be used For the integration of optical devices in optical fibers, improve the performance of integrated devices; 4. Use the tube rod stacking sleeve method and lateral slotting technology to control the geometry of the fiber core, and then draw into fibers.

Description

technical field [0001] The invention relates to a polarization-maintaining optical fiber used in the field of optical fiber communication or in the field of sensors and fiber optic devices, in particular to the structure of a rectangular multi-core polarization-maintaining optical fiber. The invention also relates to a manufacturing method of a rectangular multi-core polarization-maintaining optical fiber. Background technique [0002] Polarization Maintaining Optical Fiber (PMF, Polarization Maintaining Optical Fiber) has strong polarization maintaining ability for linearly polarized light, and has good compatibility with common single-mode optical fiber. It has a wide range of applications in advanced coherent optical communications, fiber optic gyroscopes, hydrophones, fiber optic sensors, and optical integrated devices. It is a key component in missiles and aircraft in the military field. Coherent detectors are increasingly demanding PMFs. Polarization maintaining fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/024C03C25/22C03B37/16
Inventor 苑立波关春颖田凤军戴强
Owner HARBIN ENG UNIV
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