CN203433143U - Hollow-core photonic band gap fiber used for 3-5 micron wave band light wave broadband low loss transmission - Google Patents
Hollow-core photonic band gap fiber used for 3-5 micron wave band light wave broadband low loss transmission Download PDFInfo
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- CN203433143U CN203433143U CN201320554204.0U CN201320554204U CN203433143U CN 203433143 U CN203433143 U CN 203433143U CN 201320554204 U CN201320554204 U CN 201320554204U CN 203433143 U CN203433143 U CN 203433143U
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Abstract
The utility model relates to a hollow-core photonic band gap fiber used for 3-5 micron wave band light wave broadband low loss transmission. A cross section is in a round shape. The fiber successively comprises a hollow fiber core, multilayer dielectric structure claddings and a protective layer along a radius direction from inside to outside. The multilayer dielectric structure claddings are formed by a dielectric layer group comprising different periods. The dielectric layer group is formed by ternary structure units. One ternary structure unit is a ternary structure period. By using the hollow-core photonic band gap fiber design provided in the utility model, a photonic band gap width is expanded and simultaneously transmission losses can be effectively reduced.
Description
Technical field
The utility model relate to a kind of for
3-5the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission, belongs to optical fiber technology field.
Background technology
3-5 micron middle-infrared band is important atmospheric transmission window, and because this wave band has been contained the basic frequency absorption band of a large amount of gas molecules and the fingerprint characteristic of reflection gas molecule, so 3-5 micron mid-infrared laser has significant application value at aspects such as infrared counteraction and guidance, space optical communication, atmosphere environment supervision, industrial process control and medical diagnosiss.Along with the successful development in infrared broadband tunable laser source in various types of 3-5 microns, select good online transmission medium just to seem particularly urgent to realize this wave band of laser broadband low loss transmission.Silica fibre based on total reflection principle is in the successful utilization of near infrared light communication band, the waveguide of proof optical-fiber type is the good medium of laser signal transmission, but limited by core material loss, silica fibre cannot be realized the length of middle-infrared band laser apart from low-loss transmission.For this reason, centering infrared waves is low absorption loss fluoride, sulfide and tellurite glass are used to draw mid-infrared laser Transmission Fibers in succession.Although prepare material difference, because this type optical fiber is all to utilize total reflection principle that light wave is limited in high index of refraction solid fibre core and is transmitted, therefore still can inevitably be subject to the impacts such as the various losses of core material, dispersion and nonlinear effect.For addressing these problems, researchist in succession designs and has prepared dissimilar hollow-core fiber type waveguide, and wherein the hollow bragg fiber based on one dimension photonic band gap effects leaded light new mechanism receives publicity day by day because of its novel guided wave mechanism.The 1-D photon crystal structure of this optical fiber is periodically variable multilayer dielectric layer by refractive index and forms, thereby light wave can be limited in hollow fibre core along fiber axis to transmission.Owing to utilizing photonic band gap effects, dielectric covering can by certain frequency scope (omnidirectional reflection photon band gap), the light wave with any incident direction and random polarization state be limited in the hollow fibre core of low-refraction and transmit, therefore be called again omnidirectional's guided wave optical fiber.Compare with the hollow-core photonic crystal fiber of employing two-dimensional photon band gap effect transmission mechanism, hollow bragg fiber is owing to adopting One Dimension Periodic structure, only need to change thickness and the refractive index of each dielectric covering, can realize the regulation and control of photon band gap and mode transfer characteristic, prepare difficulty simultaneously and also relatively reduce.Although hollow bragg fiber has wide spectrum and wide angle band gap properties, itself be easier to realize light wave wideband transmit, the transmission bandwidth of existing conventional bragg fiber is still relatively limited.Although the hollow bragg fiber design that exists at present some can expand transmission bandwidth, these optical fiber or complex structure, be difficult to preparation, or low-loss transmission window is discontinuous, or mode transfer loss is larger, is unfavorable for realizing long apart from low-loss transmission.
Summary of the invention
The utility model lacks good broadband low loss transmission medium problem in order to solve above-mentioned 3-5 micron waveband light wave, provide a kind of for
3-5the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission.
The utility model is realized by following measures: a kind of for
3-5the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission, xsect is circular, along radial direction, comprises successively from inside to outside hollow fibre core, multilayer dielectric structure covering, protective seam; Described multilayer dielectric structure covering consists of 1-4 group dielectric layer group; Described dielectric layer group is by 5-20 ternary structural cell formation, and a ternary structural unit is a ternary structural cycle; Arsenic selenide (the As that the refractive index in 3-5 micron waveband that described ternary structural unit is equated by thickness is 2.74
2se
3) the outer media layer forming and the middle level dielectric layer composition of internal layer dielectric layer and the formation of the polyetherimide that refractive index is 1.62 in 3-5 micron waveband (PEI) material between them, the thickness sum of outer media layer and internal layer dielectric layer and the thickness of middle level dielectric layer meet the quarter-wave condition under nearly glancing incidence condition, and the refractive index of middle level dielectric layer is lower than the refractive index of outer media layer and internal layer dielectric layer; The periodic quantity in the ternary structural cycle in described different medium layer group along radius from inside to outside direction reduce successively, the ratio of the periodic quantity in the periodic quantity in lateral media layer group and the inner side dielectric layer group that is adjacent is more than or equal to 0.8 and be less than 1.
Hollow core photonic bandgap optical fiber of the present utility model, the diameter of described hollow fibre core is 300-900 micron, the thickness range of multilayer dielectric structure covering is at 15-70 micron.
Hollow core photonic bandgap optical fiber of the present utility model, the increase that the dielectric layer group number in described multilayer dielectric structure covering requires with transmission bandwidth increases.
Hollow core photonic bandgap optical fiber of the present utility model, the dielectric layer group number that described multilayer dielectric structure covering comprises is preferably 2-4 group.
Hollow core photonic bandgap optical fiber of the present utility model, the number of the ternary structural unit that described dielectric layer group comprises is preferably 8-20.
Hollow core photonic bandgap optical fiber of the present utility model, described protective seam consists of polyetherimide (PEI) material, and thickness accounts for the 15%-25% of whole optical fiber external diameter.
The beneficial effects of the utility model are: because multilayer dielectric structure covering of the present utility model adopts the ternary structural cycle, compare with the existing diadactic structure cycle, in number of cycles and big or small homogeneous phase while, fibre cladding has higher reflectivity to the incident light wave in fibre core, this means and can obtain lower leakage loss; Because the dielectric layer of close fibre core is high refractive index layer, and its thickness is half of high index of refraction layer thickness in diadactic structure cycle covering, therefore can effectively suppress surface modes and produce, thereby further reduce guided wave mould loss; The different medium layer group that fibre cladding is reduced along radial direction from inside to outside successively by contained periodic quantity forms, and this can effectively expand photon band gap scope, and increased cladding structure parameter regulation and control degree of freedom, is easy to realize the transmission of mid-infrared light ripple broadband low loss.In sum, the hollow core photonic bandgap optical fiber design that the utility model proposes, when expanding photon band gap width, can more effectively reduce loss.
Accompanying drawing explanation
Fig. 1 represents to be used for
3-5the hollow core photonic bandgap cross section of optic fibre structural representation of micron waveband light wave broadband low loss transmission.
Fig. 2 represents the structural representation of ternary structural unit.
Fig. 3 represents the refractive index radial distribution schematic diagram of hollow core photonic bandgap optical fiber.
When Fig. 4 represents that described in embodiment 1, structural parameters are identical, conventional multilayer dielectric structure covering is respectively in the hollow core photonic bandgap optical fiber based on diadactic structure cycle and ternary structural cycle
the leakage loss contrast schematic diagram of mould.
Hollow core photonic bandgap fibre cladding when Fig. 5 represents that described in embodiment 2, covering comprises two dielectric layer groups is to having horizontal magnetic (TM) the wave reflection spectrum of different incidence angles in fibre core.
Fig. 6 represents described in embodiment 3 in optical fiber
the leakage loss curve of mould, and have with it in optical fiber based on the diadactic structure cycle of same structure parameter
the leakage loss curve of mould.
In hollow core photonic bandgap optical fiber when Fig. 7 represents that described in embodiment 4, covering comprises three dielectric layer groups
the leakage loss curve of mould.
In figure: 1, hollow fibre core, 2, dielectric layer group, 4, protective seam, 5, multilayer dielectric structure covering, 6, ternary structural unit, 7, internal layer dielectric layer, 8, middle level dielectric layer, 9, outer media layer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is made to specific description.
The utility model design for
3-5the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission as shown in Figure 1 and Figure 2, is hollow fibre core 1, multilayer dielectric structure covering 5 and the protective seam 4 that is full of air along circular xsect radial direction from inside to outside successively.
The diameter of described hollow fibre core 1 is 300-900 micron.
Described multilayer dielectric structure covering 5 is heterojunction structure, some dielectric layer groups 2, consists of, and the effect of multilayer dielectric structure covering 5 is to build 1-D photon crystal structure, light wave is limited in to transmission in the hollow fibre core 1 that is full of air; Dielectric layer group 2 numbers that form multilayer dielectric structure covering 5 require depending on transmission bandwidth, and transmission bandwidth is wider, and needed dielectric layer group 2 numbers are just more, and general 2-4 group can meet application requirements; In each dielectric layer group 2, comprise several ternary structural unit 6, ternary structural unit 6 numbers in different medium layer group 2 can be different, are generally 5-20; A described ternary structural unit 6 is a ternary structural cycle, in the middle of the outer media layer 9 being equated by thickness and internal layer dielectric layer 7, accompanying middle level dielectric layer 8 forms, the thickness sum of outer media layer 9 and internal layer dielectric layer 7 and the thickness of middle level dielectric layer 8 meet the quarter-wave condition under nearly glancing incidence condition, the refractive index of middle level dielectric layer 8 is lower than the refractive index of outer media layer 9 and internal layer dielectric layer 7, so outer media layer 9 and the internal layer dielectric layer 7 employing arsenic selenide (As that refractive index is 2.74 in 3-5 micron waveband
2se
3), middle level dielectric layer 8 adopts the polyetherimide (PEI) that refractive index is 1.62 in 3-5 micron waveband; The described ternary structural periodic quantity belonging in different medium layer group 2 varies in size, and reduces successively from inside to outside along xsect radial direction, and the ratio of the periodic quantity in lateral media layer group and in the inner side dielectric layer group being adjacent is less than 1, but can not be less than 0.8; The described ternary structural cycle is the characteristic of the utility model maximum, be also the utility model can realize good in the basic assurance of infrared broadband low loss transport property.
Fiber optic protection layer 4 consists of polyetherimide (PEI) material, and thickness accounts for the 15%-25% of whole optical fiber external diameter, and its effect is the physical strength that improves optical fiber, and protection optical fiber is avoided damage; Described hollow core photonic bandgap optical fiber utilizes one dimension photonic band gap effects leaded light, and its bandgap structure and loss transport property can be by changing fiber medium layer group number, and the parameters such as the ternary structural periodic quantity in each dielectric layer group and number realize regulation and control.Described for
3-5its preparation process of the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission is simple, is convenient to make, and can adopt the prefabricated rods-melt drawing its preparation process identical with bragg fiber.
With reference to the accompanying drawings, embodiment of the present utility model is described in conjunction with the embodiments.
As shown in Figure 3, the radius of hollow fibre core 1 is
, refractive index
, the arsenic selenide (As using in multilayer dielectric structure covering 5
2se
3) refractive index be
, the refractive index of polyetherimide (PEI)
, dielectric layer group 2 numbers that multilayer dielectric structure covering 5 comprises are
individual, i dielectric layer group 2 comprises
individual ternary structural cycle, wherein 7 layers of arsenic selenide (As used of outer media layer 9 and internal layer medium
2se
3) thickness be
, the thickness of the polyetherimide (PEI) that middle level dielectric layer 8 is used is
, periodic quantity
, in one of them cycle, the thickness of contained each dielectric layer meets the quarter-wave condition in nearly glancing incidence situation and is
; The periodic quantity in the ternary structural cycle in different medium layer group 2 meets from inside to outside along xsect radial direction
, and
.
Compare with the covering based on the diadactic structure cycle in the past, hollow core photonic bandgap optical fibre multi-layer dielectric structure covering 5 for the transmission of 3-5 micron waveband light wave broadband low loss described in the utility model is based on the ternary structural cycle 6, when getting same fibre structural parameters, incident light wave in hollow fibre core is had to higher reflectivity, therefore can obtain lower leakage loss.
Be illustrated in figure 4 conventional multilayer dielectric structure covering 5(only containing Single Medium layer group,
) respectively basic mode in the hollow core photonic bandgap optical fiber based on diadactic structure cycle and ternary structural cycle (
mould) leakage loss curve.This leakage loss adopts ray optics method to calculate, and periodic quantity and number in multilayer dielectric structure covering 5 are respectively
nm and
, the radius of hollow fibre core 1
μ m.By relatively both can find out, in photon band gap wavelength coverage, conventional ternary structural cycle covering can be realized than the conventional lower leakage loss of diadactic structure cycle covering, especially can effectively suppress the middle loss peak of band gap.
Get multilayer dielectric structure covering 5 and formed by two dielectric layer groups,
, in each dielectric layer group, respectively comprise 15 ternary structural cycles,
, the periodic quantity in two dielectric layer groups in the dielectric layer group of inner side is
nm, the periodic quantity in the dielectric layer group in outside is
nm.
In order to illustrate that the optical fiber structure design that the utility model proposes can effectively expand photon band gap bandwidth, as shown in Figure 5, the variation of the present embodiment high spot reviews omnidirectional reflection photon band gap.
Adopt transfer matrix method can calculate said structure covering to different angles incident TM wave reflection spectrum, as shown in Fig. 5 (a).As a comparison, Fig. 5 (b) has correspondingly provided number of cycles and has been all 30 conventional multilayer dielectric structure covering (
,
during nm) different angles incident TM wave reflection is composed.Comparison diagram 5(a) and (b) can see, although photon band gap scope is all in 3-5 micron middle-infrared band, it is formed that the former formed omnidirectional's reflection photon band gap (reflectivity representing between black vertical line is more than or equal to 99% wavelength coverage) is obviously greater than the latter.If adopting incident angle is that the band gap overlapping region of 0 and 85 ripples of TM while spending characterizes omnidirectional's reflection photon band gap, the sub-band gap width of the formed normalization of structure covering omnidirectional's reflected light described in the present embodiment (being band gap band width and the ratio of bandgap center frequency) for 0.207(respective wavelength scope be 3415-4205nm), and the sub-band gap width of the formed normalization of above-mentioned conventional structure covering omnidirectional's reflected light is that 0.117(respective wavelength scope is 3764-4232nm), the former is than the latter 322nm that widened about 76.9%(respective wavelength scope broadening).If further increase by two cycle differences in dielectric layer group, as be respectively 1100nm and 880nm, the sub-band gap width of the formed normalization of cladding structure described in the utility model omnidirectional reflected light is 0.331 (respective wavelength scope 3021-4219nm), is 2.83 times of the sub-band gap width of above-mentioned conventional structure covering formed normalization omnidirectional's reflected light.
Embodiment 3
Although in prior art, each dielectric layer group adopts the diadactic structure cycle also can realize photon band gap and expands, but due to reason as shown in Figure 4, its leakage loss is greater than the hollow core photonic bandgap optical fiber based on ternary structural cycle covering described in the utility model.Be illustrated in figure 6 same media layer group number (
), number of cycles (
) and size (
nm,
nm), and hollow fiber core radius (
μ m) under condition, basic mode in the large core diameter hollow core photonic bandgap optical fiber based on diadactic structure cycle and ternary structural cycle (
mould) leakage loss curve.As seen from Figure 6, although omnidirectional's Photonic Band of two kinds of structured optical fibers almost identical (scope as shown in line segment AB), but within the scope of omnidirectional's Photonic Band, the former leakage loss is obviously greater than the latter, this explanation hollow core photonic bandgap optical fiber based on the ternary structural cycle described in the utility model not only can be expanded transmission bandwidth, and can realize lower loss.
On the basis of embodiment 2 and 3, for the hollow core photonic bandgap optical fiber that further proof the utility model proposes can be realized low-loss transmission in the wider wavelength coverage of 3-5 micron middle-infrared band, described in the present embodiment, photon band-gap optical fiber multilayer dielectric structure covering consists of three dielectric layer groups,
; Radially from inside to outside, the ternary structural number of cycles comprising in three dielectric layer groups respectively is 10,16 and 16,
,
, cycle size is followed successively by
nm,
nm,
nm, hollow fiber core radius
μ m.Be illustrated in figure 7 basic mode in the hollow core photonic bandgap optical fiber of cladding structure described in the present embodiment (
mould) leakage loss curve, in figure, horizontal line represents that loss is 0.01dB/m.From this figure, in whole 3-5 micron middle-infrared band, except near wavelength place 3 microns has occurred several loss peaks, in all the other wavelength coverages, the leakage loss of basic mode is all lower than 0.01dB/m, and part wavelength coverage internal loss even can reach
below dB/m.
Claims (6)
- One kind for 3-5the hollow core photonic bandgap optical fiber of micron waveband light wave broadband low loss transmission, is characterized in that: xsect, for circular, comprises hollow fibre core (1), multilayer dielectric structure covering (5), protective seam (4) from inside to outside successively along radial direction; Described multilayer dielectric structure covering (5) consists of 1-4 group dielectric layer group (2); Described dielectric layer group (2) consists of 5-20 ternary structural unit (6), and a ternary structural unit (6) is a ternary structural cycle; Arsenic selenide (the As that the refractive index in 3-5 micron waveband that described ternary structural unit (6) is equated by thickness is 2.74 2se 3) the outer media layer (9) forming and middle level dielectric layer (8) composition of internal layer dielectric layer (7) and the formation of the polyetherimide that refractive index is 1.62 in 3-5 micron waveband (PEI) material between them, the thickness of the thickness sum of outer media layer (9) and internal layer dielectric layer (7) and middle level dielectric layer (8) meets the quarter-wave condition under nearly glancing incidence condition, and the refractive index of middle level dielectric layer (8) is lower than the refractive index of outer media layer (9) and internal layer dielectric layer (7); The periodic quantity in the ternary structural cycle in described different medium layer group (2) reduces from inside to outside successively along radial direction, and the ratio of the periodic quantity in the periodic quantity in lateral media layer group and the inner side dielectric layer group that is adjacent is more than or equal to 0.8 and be less than 1.
- 2. hollow core photonic bandgap optical fiber according to claim 1, is characterized in that: the diameter of described hollow fibre core (1) is 300-900 micron, and the thickness range of multilayer dielectric structure covering (5) is at 15-70 micron.
- 3. hollow core photonic bandgap optical fiber according to claim 1, is characterized in that: the increase that dielectric layer group (2) number that described multilayer dielectric structure covering (5) comprises requires with transmission bandwidth increases.
- 4. according to the hollow core photonic bandgap optical fiber described in claim 1 or 3, it is characterized in that: the number of the dielectric layer group (2) that described multilayer dielectric structure covering (5) comprises is 2-4 group.
- 5. hollow core photonic bandgap optical fiber according to claim 1, is characterized in that: the number of the ternary structural unit (6) that described dielectric layer group (2) comprises is 8-20.
- 6. hollow core photonic bandgap optical fiber according to claim 1, is characterized in that: described protective seam (4) consists of polyetherimide (PEI) material, and thickness accounts for the 15%-25% of whole optical fiber external diameter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487876A (en) * | 2013-09-09 | 2014-01-01 | 曲阜师范大学 | Hollow core photonic band gap optical fiber for 3-5-micrometer wave band optical wave broadband low-loss transmission |
| CN111290074A (en) * | 2020-02-21 | 2020-06-16 | 东北大学 | Intermediate infrared Bragg optical fiber and gas qualitative and quantitative detection device thereof |
| CN111474625A (en) * | 2020-03-02 | 2020-07-31 | 华中科技大学 | Multiband transmission optical fiber and preparation method thereof |
-
2013
- 2013-09-09 CN CN201320554204.0U patent/CN203433143U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487876A (en) * | 2013-09-09 | 2014-01-01 | 曲阜师范大学 | Hollow core photonic band gap optical fiber for 3-5-micrometer wave band optical wave broadband low-loss transmission |
| CN103487876B (en) * | 2013-09-09 | 2016-02-03 | 曲阜师范大学 | A kind of air-core photonic band pbg fiber for the transmission of 3-5 micron waveband light wave broadband low loss |
| CN111290074A (en) * | 2020-02-21 | 2020-06-16 | 东北大学 | Intermediate infrared Bragg optical fiber and gas qualitative and quantitative detection device thereof |
| CN111474625A (en) * | 2020-03-02 | 2020-07-31 | 华中科技大学 | Multiband transmission optical fiber and preparation method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140212 Effective date of abandoning: 20160203 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |