CN200972513Y - Single mould photon crystal optical fibre - Google Patents

Abstract

An optical fiber of single-mode photonic crystals comprises a cable core area, a cladding area and a light guide defect area that is arranged between the cladding area and the cable core area. The refractive index of the defect area is greater than those of the cable core area and the cladding area. The inside of the cable core area and the cladding area is provided with ventages and the ventages are the ventages that have the same directions with the central axis of the optical cable. The cross section of the defect area is a zonary regular polygon (such as a square, a rectangle, a regular hexagon, a regular octagon, a regular dodecagon, a circle or an ellipse, etc.) that are formed by the joining of missing ventages with the cross section of the optical fiber as the center. The utility model realizes large area polygon zonary single mode optical field. The device can be used for the conducting of high-power laser and can also be plied in such power distributor, etc.

Description

Single mould photon crystal optical fiber

(1) technical field:

The utility model relates to a kind of photonic crystal fiber.

(2) background technology:

Over past ten years, photonic crystal fiber has the fervent concern that many excellent characteristic are subjected to whole world scientists because of it.Photonic crystal fiber is called porous optical fiber or microstructured optical fibers again, the refractive index that is characterized in covering is subjected to wavelength magnitude and periodically modulates, this modulation generally realizes that by the airport of introducing elongation vertically in silex glass fibre core has destroyed the periodic defective of index modulation by one and constituted.With respect to the effective refractive index of covering, if fibre core is made of low-index material (as air), this optical fiber is by band gap principle leaded light, and it requires strict arrangement of airport in the covering.The fiber core refractive index of another kind of photonic crystal fiber is higher, therefore just can realize the conduction of light by total internal reflection, and this type optical fiber is not very accurate to the periodic arrangement requirement of airport in the covering, therefore makes than being easier to.

The good characteristic that photonic crystal fiber has makes it bring into play very big effect at optical communication field, can realize dispersion compensation in the Optical Fiber Transmission process utilizing its strong nonlinearity characteristic and birefringence effect can make many photonic devices such as the high dispersion characteristics of utilizing it.Though can weaken nonlinear effect by increasing mould field, fiber cores district, the action effect of this method is very limited, is necessary to develop the new method of more efficiently increase mode field area.

(3) utility model content:

The technical problems to be solved in the utility model provides the single mould photon crystal optical fiber that a kind of field distribution is the polygon band shape, can very increase mode field area effectively, reduce optical power density, the heat diffusion that produces when helping active medium to excite also helps further development of new optical power distribution devices.

For this reason, the utility model adopts following technical scheme:

A kind of single mould photon crystal optical fiber, include core region, cladding regions and be arranged in cladding regions and core region between the defect area of leaded light, the refractive index of described defect area 1 is greater than the refractive index of core region, cladding regions, be provided with airport in described core region and the cladding regions, described airport is and the equidirectional air hole of fiber optic hub axle.

Described defect area 1 cross section is that the airport by disappearance couples together that what form is the banded regular polygon (as square, rectangle, regular hexagon, octagon, dodecagon, circle or ellipse etc.) at center with the optical fiber kernel of section.

Described airport 4 is arranged in the periodicity of core region 2 and is arranged identical with airport in the periodicity of cladding regions.

Described core region is made up of a whole airport.

The cross section of core region 2 is regular polygon (as square, rectangle, regular hexagon, octagon, dodecagon, circle or an ellipse etc.).

The utility model compared with prior art, have following apparent beneficial effect: the mould field is polygonal zonal arrangement, can guarantee the pattern of basic mode, has very increased mode field area again effectively.

(4) description of drawings:

Fig. 1 is the cross-sectional view of first embodiment of the present utility model;

Fig. 2 is the cross-sectional view of second embodiment of the present utility model;

Fig. 3 is the cross-sectional view of the 3rd embodiment of the present utility model.

(5) embodiment

Embodiment one:

Referring to Fig. 1, photonic crystal fiber leaded light zone 1 is that the airport by a plurality of disappearances couples together that what form is the orthohexagonal banded structure at center with the optical fiber kernel of section, and core region 2 and cladding regions 3 all are to be made of airport 4 evenly distributed in silex glass background 5.A kind of periodic arrangement that adopts the present technique field to generally acknowledge, promptly as shown in Figure 1, every three adjacent airports 4 constitute an equilateral triangle.The airport diameter d is 0.69 micron, and airport spacing Λ is 2.3 microns.The ratio of airport diameter and pitch of holes possesses single mode transport characteristic ceaselessly less than 0.45, and the single-mode field that exists in each airport disappearance position interconnects and interferes and forms an orthohexagonal banded single-mode field.When covering thicker (the airport number of plies is more), the border will be very little to the influence of light field, and the fluctuating of field strength will disappear in the aperture, and the each point light intensity is with basically identical.

Embodiment two:

Referring to Fig. 2, the geometry core region 2 of optical fiber is to be made of a littler bigger circular airport of refractive index, and other are with embodiment one.The outer boundary of banded light field is the regular hexagon by 1 decision of leaded light defect area, and inner boundary then is the circle by how much core region 2 decisions.It is pointed out that identical with embodiment one, when covering is thicker, the border to light field to influence meeting very little, the fluctuating of field strength will disappear in the aperture, the each point light intensity is with basically identical.

Embodiment three:

Referring to Fig. 3, the geometry core region 2 of optical fiber is to be made of a square airport in Fig. 5, and leaded light defect area 1 is the square banded structure that is surrounded by the airport that two circles lack, and other are with embodiment one.The outer boundary of banded light field is the square by 1 decision of leaded light defect area, and inner boundary also is the square by how much core region 2 decisions, because two circle airport disappearances are arranged in the leaded light defect area 1, the result forms the banded light field of broad.Be similar to embodiment one and embodiment two, when covering is thicker, the border to light field to influence meeting very little, the fluctuating of field strength will disappear in the aperture, the each point light intensity is with basically identical.

Claims (5)

1. A single-mode photonic crystal fiber, characterized in that it includes a core region, a cladding region and a light-guiding defect region arranged between the cladding region and the core region, and the refractive index of the defect region is greater than that of the fiber The refractive index of the core area and the cladding area, the core area and the cladding area are provided with air holes, and the air holes are air through holes in the same direction as the central axis of the optical fiber. 2. The single-mode photonic crystal fiber according to claim 1, characterized in that the section of the defect region (1) is a band-shaped regular polygon centered on the center of the fiber section formed by connecting missing air holes. 3. The single-mode photonic crystal fiber according to claim 2, characterized in that the periodic arrangement of the air holes (4) in the core region (2) is the same as that of the air holes (4) in the cladding region (3) The periodic arrangement is the same. 4. The single-mode photonic crystal fiber according to claim 2, wherein the core region is composed of a whole air hole. 5. The single-mode photonic crystal fiber according to claim 2, characterized in that the cross-section of the core region (2) is a regular polygon.

Images