CN2775690Y - Photon crystal optical fiber - Google Patents
Photon crystal optical fiber Download PDFInfo
- Publication number
- CN2775690Y CN2775690Y CN 200420110883 CN200420110883U CN2775690Y CN 2775690 Y CN2775690 Y CN 2775690Y CN 200420110883 CN200420110883 CN 200420110883 CN 200420110883 U CN200420110883 U CN 200420110883U CN 2775690 Y CN2775690 Y CN 2775690Y
- Authority
- CN
- China
- Prior art keywords
- cladding
- covering
- air holes
- airport
- fiber core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title abstract description 8
- 239000013078 crystal Substances 0.000 title abstract 2
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 238000005253 cladding Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 239000004038 photonic crystal Substances 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000009022 nonlinear effect Effects 0.000 abstract description 2
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 4
- 230000003287 optical effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The utility model relates to a photon crystal optical fiber, which comprises a fiber core and a cladding, wherein the cladding is arranged in the peripheral region of the fiber core; the refractivity of the cladding is smaller than the refractivity of the fiber core; the center of background material is provided with a central hole; the fiber core and the cladding are composed of air holes which are evenly arranged in a periodic mode around the center hole in the background material; the duty ratio of the air holes in the region of the fiber core is smaller than the duty ratio of the air holes in the region of the cladding, wherein the air holes forming the fiber core have the same diameter with the air holes forming the cladding, and the separation distance of every two adjacent air holes forming the cladding is larger than the separation distance of every two adjacent air holes forming the cladding; or, the separation distance of every two adjacent air holes forming the cladding is equal to the separation distance of every two adjacent air holes forming the cladding and the diameter of the air holes forming the fiber core is smaller than the diameter of the air holes forming the cladding. The fiber core of an optical fiber is formed by that a plurality of air holes are evenly distributed in the background material; the fiber core has larger area; the area of a mould field is basically equal to the area of the fiber core; thus, the utility model can realize the transmission of a large mould field and can reduce nonlinear effect.
Description
(1) technical field
The utility model relates to a kind of photonic crystal fiber, and particularly a kind of mode field area is very big, mode field area is to the insensitive photonic crystal fiber of wavelength.
(2) background technology
Photonic crystal fiber is called porous optical fiber or microstructured optical fibers again.On fiber end face, regularly arranged many air apertures are elongation vertically in background material, at air aperture of the center of optical fiber disappearance, forms the fibre core of leaded light, and the evenly distributed formation covering of peripheral air hole in background material.Fiber core refractive index is greater than covering, this class photonic crystal fiber is to carry out leaded light by the principle of total internal reflection, and the optical mode field is limited to the central defect position substantially, by changing covering hollow pore opening and pitch of holes size, can suitably increase mode field area, but the amplitude that increases is very limited.If lack a plurality of air apertures in the center, though can increase mode field area, multimode transmission often.Therefore be necessary to design the photonic crystal fiber of big mould field and energy single mode transport.
(3) summary of the invention
The purpose of this utility model is to solve that the existing fiber mode field area is big inadequately, mode field area increases the limited shortcoming of amplitude, provide a kind of mode field area enough greatly, mode field area is to the insensitive photonic crystal fiber of wavelength.
For this reason, the utility model is taked following technical scheme:
A kind of photonic crystal fiber, comprise fibre core and covering, described covering is arranged on the fibre core outer peripheral areas, its refractive index is lower than core segment, the background material center is provided with center pit, the airport that constitutes fibre core and covering is periodically evenly arranged in background material around described center pit, and the airport dutycycle of core region is less than the dutycycle of cladding regions.
Further, the airport diameter that constitutes fibre core and covering is identical, and per two the adjacent vacant pore spacings that constitute fibre core are greater than per two the adjacent vacant pore spacings that constitute covering.
Per two the adjacent vacant pore spacings that constitute fibre core equate that with per two the adjacent vacant pore spacings that constitute covering the airport diameter that constitutes fibre core is less than the airport diameter that constitutes covering.
The adjacent vacant pore spread geometry that links to each other is one of following manner: 1. equilateral triangle, and 2. square, 3. other regular polygons, 4. layer structure.
The airport number of turns that constitutes core region is the 1-30 circle.
The utility model has the advantages that: fiber core is to be made of the uniform arrangement of a plurality of airports in background material, and area is bigger, and mode field area is substantially equal to the area of fibre core, can realize the transmission of big mould field, reduces nonlinear effect.The optical fiber that the utility model provides can weaken optical power density greatly when making active device, eliminate the gain saturation effect, and mode field area might be applied to the accurate detection that limits in territory, place and accept in the middle of the system the insensitive characteristic of wavelength.
(4) description of drawings
Fig. 1 is the cross sectional representation of an embodiment of the utility model;
Fig. 2 is the cross sectional representation of another embodiment of the utility model.
(5) embodiment
Embodiment one:
With reference to accompanying drawing 1, a kind of photonic crystal fiber, comprise fibre core and covering, background material 2 centers are provided with center pit, the airport 1 that constitutes fibre core and covering is periodically evenly arranged in background material around described center pit, and the airport spacing equates on the wherein whole fiber end face, and fibre core is by the uniform arrangement in background material of a plurality of less airports, formation leaded light zone, this zone directly limits the area of single-mode field.Outer peripheral areas is made of the uniform arrangement of bigger airport in background material, because of the airport dutycycle greater than core region, refractive index is slightly less than core region, forms covering.On the whole end face of optical fiber, a kind of periodic arrangement that adopts the present technique field to generally acknowledge, promptly as shown in Figure 1, every three adjacent airports link to each other and constitute an equilateral triangle.
Embodiment two:
With reference to accompanying drawing 2, a kind of photonic crystal fiber, comprise fibre core and covering, background material 2 centers are provided with center pit, and the airport 1 that constitutes fibre core and covering is periodically evenly arranged in background material around described center pit, the overhead pore opening equalization of whole fiber end face, bigger in core region airport spacing, the airport spacing of cladding regions is less, so the airport dutycycle of core region is less than covering, refractive index is slightly larger than covering, forms the leaded light zone.The mould field is limited to core region substantially, and when the core region area was very big, the size of mode field area was determined by core district area, basically not with wavelength variations.
Embodiment three:
Airport spacing on the whole fiber end face equates that the airport diameter of core region is slightly less than the airport diameter in the covering, and the airport dutycycle of core region is slightly less than covering, forms the leaded light zone.Every adjacent four airports constitute square arrangement, form the mould field equally and are limited to the interior large mode area pcf of fibre core areal extent.Other condition is with embodiment one.
Embodiment four:
Airport spacing on the whole fiber end face equates that the airport diameter of core region is slightly less than the airport diameter in the covering, and the airport dutycycle of core region is slightly less than covering, forms the leaded light zone.The airport number of turns of core region is 30 circles, can form the photonic crystal fiber of super large mode field area.Other condition is with embodiment one.
Claims (5)
1. photonic crystal fiber, comprise fibre core and covering, described covering is arranged on the fibre core outer peripheral areas, its refractive index is lower than core segment, it is characterized in that the background material center is provided with center pit, the airport that constitutes fibre core and covering is periodically evenly arranged in background material around described center pit, and the airport dutycycle of core region is less than the dutycycle of cladding regions.
2. photonic crystal fiber as claimed in claim 1, the airport diameter that it is characterized in that constituting fibre core and covering is identical, and per two the adjacent vacant pore spacings that constitute fibre core are greater than per two the adjacent vacant pore spacings that constitute covering.
3. photonic crystal fiber as claimed in claim 1 is characterized in that per two the adjacent vacant pore spacings that constitute fibre core equate that with per two the adjacent vacant pore spacings that constitute covering the airport diameter that constitutes fibre core is less than the airport diameter that constitutes covering.
4. photonic crystal fiber as claimed in claim 1 is characterized in that the adjacent vacant pore spread geometry that links to each other is one of following manner: 1. equilateral triangle, and 2. square, 3. other regular polygons, 4. layer structure.
5. photonic crystal fiber according to claim 1, the airport number of turns that it is characterized in that described formation core region are the 1-30 circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420110883 CN2775690Y (en) | 2004-12-03 | 2004-12-03 | Photon crystal optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420110883 CN2775690Y (en) | 2004-12-03 | 2004-12-03 | Photon crystal optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2775690Y true CN2775690Y (en) | 2006-04-26 |
Family
ID=36750006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420110883 Expired - Fee Related CN2775690Y (en) | 2004-12-03 | 2004-12-03 | Photon crystal optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2775690Y (en) |
-
2004
- 2004-12-03 CN CN 200420110883 patent/CN2775690Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |