CN204903804U - Fine comb filter of equiband flat top full gloss not - Google Patents
Fine comb filter of equiband flat top full gloss not Download PDFInfo
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- CN204903804U CN204903804U CN201520686373.9U CN201520686373U CN204903804U CN 204903804 U CN204903804 U CN 204903804U CN 201520686373 U CN201520686373 U CN 201520686373U CN 204903804 U CN204903804 U CN 204903804U
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- fiber
- zehnder interferometer
- asymmetric mach
- coupler
- coupling mechanism
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Abstract
The utility model belongs to the technical field of an intensive light wave multiplex technique for the optical communication and specifically relates to a fine comb filter of equiband flat top full gloss not and preparation method is related to. Including tertiary asymmetric mach -Zehnder interferometer, tertiary asymmetric mach -Zehnder interferometer between be provided with the single mode fiber that the arm is interfered to optic fibre, every grade of asymmetric mach -Zehnder interferometer adopts different kinds of fiber coupler hybrid junctions to constitute, has the poor journey of certain optic fibre between per two fiber coupler, every grade of poor journey of optic fibre sets up the difference, every fiber coupler coupling coefficient sets up the difference, its simple structure is with low costs, easily batch production. Every fiber coupler's splitting ratio can the accurate control, has reduced the degree of difficulty of actual preparation wave filter, and it varies not only to have realized takes the wide type output register for easy reference, passband flat top very moreover, and the filtering effect is good, and the device has higher isolation simultaneously, can promote information transmission capacity and simultaneous transmission different rates's light signal.
Description
Technical field
The utility model relates to the intensive multiplexed optical wave technical field for optical communication, especially relates to a kind of different-bandwidth flat-top all-fiber comb filter.
Background technology
At present, close wavelength-division multiplex technology becomes raising and constantly to rise the Main Means of message capacity, optical interleaver is the Primary Component in close wavelength-division multiplex technology, not only well solve communications capacity, but also alleviate the burden of dense wave division multipurpose related device, in dense wave division multipurpose network system, play vital effect.Along with increasing of channel number makes channel spacing become more and more narrow, and then system is just more and more higher to the spectrally resolved requirement of filtering device.In existing non-all-fiber devices technology, realize wave filter output spectra passband and all realize top flat and high isolation, not only complexity is high, also improves cost and manufacture difficulty in practice; And in all-fiber devices technology, although achieved device passband different-bandwidth to export, but channel wherein presents sinusoidal pattern, cause the filter effect deterioration of wave filter, affect the proper communication of signal, channel isolation is not high simultaneously, be difficult to the cross-interference issue avoided between signal, meanwhile, in making devices process, the coupling coefficient of fiber coupler only controls by experience, and these problems are not also well solved.
Summary of the invention
The purpose of this utility model is avoid the defect of prior art and provide a kind of different-bandwidth flat-top all-fiber comb filter, efficiently solves prior art Problems existing.
For achieving the above object, the technical scheme that the utility model is taked is: described a kind of different-bandwidth flat-top all-fiber comb filter, be characterized in comprising three grades of asymmetric mach-zehnder interferometer, the single-mode fiber of fiber optic interferometric arm is provided with between three grades of described asymmetric mach-zehnder interferometer, every grade of asymmetric mach-zehnder interferometer adopts dissimilar fiber coupler Hybrid connections to form, there is certain optical fiber difference journey in the fiber optic interferometric arm between every two fiber couplers, every grade of optical fiber difference journey arranges difference, each fiber coupler coupling coefficient difference is set, the output port a of single-mode optical-fibre coupler C1
1and a
2respectively with the input port a of coupling mechanism C2
3and a
4corresponding connection, the output port a of coupling mechanism C2
3' and a
4' respectively with the input port a of coupling mechanism C3
5and a
6corresponding connection, the output port a of coupling mechanism C3
5' and a
6' respectively with the input port a of coupling mechanism C4
7and a
8corresponding connection.
Described first order asymmetric mach-zehnder interferometer is made up of two linear pattern 3 × 3 single-mode optical-fibre coupler C1 and C2, second level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C2 and 2 × 2 type single-mode optical-fibre coupler C3, third level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C3 and 3 × 3 type single-mode optical-fibre coupler C4, and the fiber optic interferometric arm length difference of first order asymmetric mach-zehnder interferometer is set to Δ l
1, the fiber optic interferometric arm length difference of second level asymmetric mach-zehnder interferometer is set to Δ l
2, the fiber optic interferometric arm length difference of third level asymmetric mach-zehnder interferometer is set to Δ l
3.
The fiber coupler of three grades of described asymmetric mach-zehnder interferometer is when connecting, all reserve a fiber port to hold as the free time, in manufacturing process, adopt the mode of same optical fiber being carried out continuously to fused biconical taper, utilize idle end accurately to monitor the coupling coefficient of coupling mechanism.
The preparation method of described a kind of different-bandwidth flat-top all-fiber comb filter, is characterized in comprising the steps:
(1), open light source and light power meter preheating 30-60 minute, input tunable optical source power is calibrated, light source is connected to optical power detector by fiber reel;
(2), according to the coupling coefficient of each coupling mechanism that will make, carry out according to the following formula changing value corresponding to calculating composition light ratio;
Conversion formula for linear pattern 3 × 3 single-mode optical-fibre coupler splitting ratio p:
p＝0.25(1+cosk)
2:0.5sin
2k:0.25(1-cosk)
2
Conversion formula for 2 × 2 single-mode optical-fibre coupler splitting ratio p ':
p'＝cos
2k:sin
2k
K in two formula represents the coupling coefficient of corresponding coupling mechanism;
(3), first fiber coupler C3 is made, select healthy and free from worry SMF28 single-mode fiber, identical two optical fiber are peelled off coat 20-30mm in coupled section, with being stained with spirituous dust-free paper wiped clean, continuous scouring three times, each wiping about 30 times, and the operator's console fiber clamp middle adopting parallel mode to be placed on to draw cone machine, be placed in high-temperature field and get angry stretching; What adopt is that the direct-fired mode of oxyhydrogen flame draws cone, control to draw cone speed 120 μm/s ~ 150 μm/s by computer program, burn flame width 6mm, temperature range is 1165 DEG C ~ 1170 DEG C, observe and draw the splitting ratio that cone machine instrument shows, just stop stretching after the predetermined splitting ratio of arrival, only carry out separately heating continue melting two optical fiber and reach final splitting ratio, flame front exits, and namely now ceases fire; Quartz ampoule now must be installed immediately to protect coupled section, and be fixed with 353ND packaging plastic and solidify;
(4) the fiber optic interferometric arm length difference Δ l between fiber coupler C3 and fiber coupler C4, is made
3; A middle part between fiber coupler C3 and fiber coupler C4 one fiber arm is wrapped on piezoelectric ceramics (PZT) cylinder, carries out with PZT the length variations controlling optical fiber, thus change fiber optic interferometric arm length difference Δ l
3value;
(5), fiber coupler C4 is made, optical fiber 1 and optical fiber 2 are drawn and adds identical 3rd optical fiber, by identical 3 optical fiber, carry out melting drawing according to third step, from the fiber coupler C4 splitting ratio that 1 idle port of coupling mechanism C4 adopts light power meter to carry out detecting;
(6) the fiber optic interferometric arm length difference Δ l between fiber coupler C3 and fiber coupler C2, is made
2; Repeat the 4th step;
(7), fiber coupler C2 is made; Repeat the 5th step;
(8) the fiber optic interferometric arm length difference Δ l between fiber coupler C2 and coupling mechanism C1, is made
1; Repeat the 4th step;
(9), fiber coupler C1 is made; Repeat the 5th step.
The beneficial effects of the utility model are: described a kind of different-bandwidth flat-top all-fiber comb filter, and its structure is simple, and the splitting ratio of each fiber coupler can accurately control, and reduces the difficulty of actual fabrication wave filter.This different-bandwidth optical fiber comb filter not only achieves different-bandwidth type output power spectrum, and passband flat-top very, filter effect is excellent, device has higher isolation simultaneously, information carrying capacity can be promoted and transmit the light signal of different rates simultaneously, also there is cost low feature in addition, be easy to batch production.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present utility model;
Shown in figure: 1,2 and 3 is signal input ports; C1, C2 and C4 are 3 × 3 type fiber couplers; C3 is 2 × 2 type fiber couplers.
Fig. 2 is that the utility model makes coupling mechanism C3 principle schematic;
Fig. 3 is that the utility model makes fiber optic interferometric arm length difference Δ l
3, Δ l
2with Δ l
1principle schematic;
Fig. 4 is that the utility model makes coupling mechanism C4, C2 and C1 principle schematic;
Fig. 5 is concrete result of implementation schematic diagram of the present utility model.
Described in figure: ordinate (Normalizedoutputintensity/dB) is signal normalization output power spectrum; Horizontal ordinate (wavelength (λ)/nm) is signal wavelength range.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, described a kind of different-bandwidth flat-top all-fiber comb filter, be characterized in comprising three grades of asymmetric mach-zehnder interferometer, the single-mode fiber of fiber optic interferometric arm is provided with between three grades of described asymmetric mach-zehnder interferometer, every grade of asymmetric mach-zehnder interferometer adopts dissimilar fiber coupler Hybrid connections to form, there is certain optical fiber difference journey in the fiber optic interferometric arm between every two fiber couplers, every grade of optical fiber difference journey arranges difference, each fiber coupler coupling coefficient difference is set, the output port a of single-mode optical-fibre coupler C1 during connection
1and a
2, respectively with the input port a of coupling mechanism C2
3and a
4corresponding connection, the output port a of coupling mechanism C2
3' and a
4', respectively with the input port a of coupling mechanism C3
5and a
6corresponding connection, the output port a of coupling mechanism C3
5' and a
6', respectively with the input port a of coupling mechanism C4
7and a
8corresponding connection.
Described first order asymmetric mach-zehnder interferometer is made up of two linear pattern 3 × 3 single-mode optical-fibre coupler C1 and C2, second level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C2 and 2 × 2 type single-mode optical-fibre coupler C3, third level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C3 and 3 × 3 type single-mode optical-fibre coupler C4, and the fiber optic interferometric arm length difference of first order asymmetric mach-zehnder interferometer is set to Δ l
1, the fiber optic interferometric arm length difference of second level asymmetric mach-zehnder interferometer is set to Δ l
2, the fiber optic interferometric arm length difference of third level asymmetric mach-zehnder interferometer is set to Δ l
3.Every grade of optical fiber difference journey arranges difference, and the power spectrum of wave filter can be made to realize different-bandwidth and export, the setting of each fiber coupler coupling coefficient, can make the power spectrum of wave filter realize passband flat-top and high channel isolation.
The fiber coupler of three grades of described asymmetric mach-zehnder interferometer is when connecting, all reserve a fiber port to hold as the free time, in manufacturing process, adopt the mode of same optical fiber being carried out continuously to fused biconical taper, utilize idle end accurately to monitor the coupling coefficient of coupling mechanism; The fiber optic interferometric arm length difference arranged when it meets relationship delta l
1=-Δ l
3=-2 Δ l
2, and the coupling coefficient value k of each fiber coupler
1=0.7854; k
2=0.6830; k
3=0.4134; k
4when=0.1848, described different-bandwidth flat-top all-fiber comb filter has best output power spectral pattern and higher isolation, and filter effect reaches best.
As shown in Figures 2 to 4, a kind of preparation method of different-bandwidth flat-top all-fiber comb filter, is characterized in comprising the steps:
(1), open light source and light power meter preheating 30-60 minute, input tunable optical source power is calibrated, light source is connected to optical power detector by fiber reel, determine that input light source power is 1mW;
(2), according to the coupling coefficient of each coupling mechanism that will make, carry out according to the following formula changing value corresponding to calculating composition light ratio;
Conversion formula for linear pattern 3 × 3 single-mode optical-fibre coupler splitting ratio p:
p＝0.25(1+cosk)
2:0.5sin
2k:0.25(1-cosk)
2
Conversion formula for 2 × 2 single-mode optical-fibre coupler splitting ratio p ':
p'＝cos
2k:sin
2k
K in two formula represents the coupling coefficient of corresponding coupling mechanism;
(3), first fiber coupler C3 is made, select healthy and free from worry SMF28 single-mode fiber, identical two optical fiber are peelled off coat 20-30mm in coupled section, with being stained with spirituous dust-free paper wiped clean, continuous scouring three times, each wiping about 30 times, and the operator's console fiber clamp middle adopting parallel mode to be placed on to draw cone machine, be placed in high-temperature field and get angry stretching; What adopt is that the direct-fired mode of oxyhydrogen flame draws cone, control to draw cone speed 120 μm/s ~ 150 μm/s by computer program, burn flame width 6mm,, temperature range is 1165 DEG C ~ 1170 DEG C, observes and draws the splitting ratio that cone machine instrument shows, just stop stretching after the predetermined splitting ratio of arrival, only carry out separately heating continue melting two optical fiber and reach final splitting ratio, flame front exits, and namely now ceases fire; Quartz ampoule now must be installed immediately to protect coupled section, and be fixed with 353ND packaging plastic and solidify;
(4) the fiber optic interferometric arm length difference Δ l between fiber coupler C3 and fiber coupler C4, is made
3; A middle part between fiber coupler C3 and fiber coupler C4 one fiber arm is wrapped on piezoelectric ceramics (PZT) cylinder, carries out with PZT the length variations controlling optical fiber, thus change fiber optic interferometric arm length difference Δ l
3value;
(5), fiber coupler C4 is made, optical fiber 1 and optical fiber 2 are drawn and adds identical 3rd optical fiber, by identical 3 optical fiber, carry out melting drawing according to third step, from the fiber coupler C4 splitting ratio that 1 idle port of coupling mechanism C4 adopts light power meter to carry out detecting;
(6) the fiber optic interferometric arm length difference Δ l between fiber coupler C3 and fiber coupler C2, is made
2; Repeat the 4th step;
(7), fiber coupler C2 is made; Repeat the 5th step;
(8) the fiber optic interferometric arm length difference Δ l between fiber coupler C2 and coupling mechanism C1, is made
1; Repeat the 4th step;
(9), fiber coupler C1 is made; Repeat the 5th step.
As shown in Figure 5, the power stage of the optical interleaver of this structure spectrum not only achieves different-bandwidth and exports, and more crucially the passband top of two channels all presents good flat-top, and achieve most flat response, combed filter quality is high; The channel isolation of device reaches about 70dB simultaneously, has good anti-crosstalk characteristic.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (3)
1. a different-bandwidth flat-top all-fiber comb filter, it is characterized in that comprising three grades of asymmetric mach-zehnder interferometer, the single-mode fiber of fiber optic interferometric arm is provided with between three grades of described asymmetric mach-zehnder interferometer, every grade of asymmetric mach-zehnder interferometer adopts dissimilar fiber coupler Hybrid connections to form, there is certain optical fiber difference journey in the fiber optic interferometric arm between every two fiber couplers, every grade of optical fiber difference journey arranges difference, each fiber coupler coupling coefficient difference is set, the output port a of single-mode optical-fibre coupler C1
1and a
2respectively with the input port a of coupling mechanism C2
3and a
4corresponding connection, the output port a of coupling mechanism C2
3' and a
4' respectively with the input port a of coupling mechanism C3
5and a
6corresponding connection, the output port a of coupling mechanism C3
5' and a
6' respectively with the input port a of coupling mechanism C4
7and a
8corresponding connection.
2. a kind of different-bandwidth flat-top all-fiber comb filter as claimed in claim 1, it is characterized in that: described first order asymmetric mach-zehnder interferometer is made up of two linear pattern 3 × 3 single-mode optical-fibre coupler C1 and C2, second level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C2 and 2 × 2 type single-mode optical-fibre coupler C3, third level asymmetric mach-zehnder interferometer is made up of single-mode optical-fibre coupler C3 and 3 × 3 type single-mode optical-fibre coupler C4, the fiber optic interferometric arm length difference of first order asymmetric mach-zehnder interferometer is set to Δ l
1, the fiber optic interferometric arm length difference of second level asymmetric mach-zehnder interferometer is set to Δ l
2, the fiber optic interferometric arm length difference of third level asymmetric mach-zehnder interferometer is set to Δ l
3.
3. a kind of different-bandwidth flat-top all-fiber comb filter as claimed in claim 1, it is characterized in that: the fiber coupler of three grades of described asymmetric mach-zehnder interferometer is when connecting, all reserve a fiber port to hold as the free time, in manufacturing process, adopt the mode of same optical fiber being carried out continuously to fused biconical taper, utilize idle end accurately to monitor the coupling coefficient of coupling mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520686373.9U CN204903804U (en) | 2015-09-07 | 2015-09-07 | Fine comb filter of equiband flat top full gloss not |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520686373.9U CN204903804U (en) | 2015-09-07 | 2015-09-07 | Fine comb filter of equiband flat top full gloss not |
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| Publication Number | Publication Date |
|---|---|
| CN204903804U true CN204903804U (en) | 2015-12-23 |
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ID=54925969
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520686373.9U Withdrawn - After Issue CN204903804U (en) | 2015-09-07 | 2015-09-07 | Fine comb filter of equiband flat top full gloss not |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093419A (en) * | 2015-09-07 | 2015-11-25 | 兰州交通大学 | Asymmetrical bandwidth all-fiber flat-top comb filter and preparation method thereof |
| CN105425340A (en) * | 2015-12-21 | 2016-03-23 | 华中科技大学 | Optical comb filter |
| CN108833016A (en) * | 2018-06-29 | 2018-11-16 | 华中科技大学 | A kind of single chip integrated wavelength-division multiplex single fiber bi-directional data transmission module |
| CN113253392A (en) * | 2021-07-02 | 2021-08-13 | 西安奇芯光电科技有限公司 | Flat-top type multipath signal wave-splitting or wave-combining device structure |
-
2015
- 2015-09-07 CN CN201520686373.9U patent/CN204903804U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093419A (en) * | 2015-09-07 | 2015-11-25 | 兰州交通大学 | Asymmetrical bandwidth all-fiber flat-top comb filter and preparation method thereof |
| CN105093419B (en) * | 2015-09-07 | 2018-03-06 | 兰州交通大学 | A kind of different-bandwidth flat-top all -fiber comb filter and preparation method thereof |
| CN105425340A (en) * | 2015-12-21 | 2016-03-23 | 华中科技大学 | Optical comb filter |
| CN108833016A (en) * | 2018-06-29 | 2018-11-16 | 华中科技大学 | A kind of single chip integrated wavelength-division multiplex single fiber bi-directional data transmission module |
| CN113253392A (en) * | 2021-07-02 | 2021-08-13 | 西安奇芯光电科技有限公司 | Flat-top type multipath signal wave-splitting or wave-combining device structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151223 Effective date of abandoning: 20180306 |