CN103163664A - Frequency-selective wave filter based on micro-ring resonant cavity - Google Patents
Frequency-selective wave filter based on micro-ring resonant cavity Download PDFInfo
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- CN103163664A CN103163664A CN2013101130440A CN201310113044A CN103163664A CN 103163664 A CN103163664 A CN 103163664A CN 2013101130440 A CN2013101130440 A CN 2013101130440A CN 201310113044 A CN201310113044 A CN 201310113044A CN 103163664 A CN103163664 A CN 103163664A
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Abstract
The invention discloses a frequency-selective wave filter based on a micro-ring resonant cavity. The frequency-selective wave filter based on the micro-ring resonant cavity comprises the micro-ring resonant cavity, a first main waveguide, a second main waveguide, a first optical fiber coupler and a second optical fiber coupler, wherein the micro-ring resonant cavity is connected with the first main waveguide through the first optical fiber coupler, an Input end of the first main waveguide is a signal input end of the frequency-selective wave filter, a Through end of the first main waveguide is a first signal output end of the frequency-selective wave filter, the micro-ring resonant cavity is connected with the second main waveguide through the second optical fiber coupler, and a Drop end of the second main waveguide is a second signal output end of the frequency-selective wave filter. One side of the micro-ring resonant cavity is connected with a first key data processor (KDP) modulator between the first optical fiber coupler and the second optical fiber coupler, the other side of the micro-ring resonant cavity is connected with a second KDP modulator between the first optical fiber coupler and the second optical fiber coupler, and both the first KDP modulator and the second KDP modulator are communicated with a power source. The frequency-selective wave filter based on the micro-ring resonant cavity has the advantages of being small in size, favorable for integration of an optical fiber system, high in sensitivity and tuning speed and the like.
Description
Technical field
The invention belongs to the optical information technical field, be specifically related to a kind of frequency-selecting filter based on micro-ring resonant cavity.
Background technology
Along with communication technology ground high speed development, the micro-ring resonant wave filter is subject to technician's extensive concern and research, has more and more important effect in the optical communication technique field.The radius of micro-ring resonant cavity very little (micron level), similar with the optical wavelength size, therefore, it has very high integration.Light in resonator cavity after iterative cycles from the straight-through end (through) of this structure and lower terminal (drop) output: when light wave and resonator cavity reach phase matching, light could be from the lower terminal output of system, and the optical wavelength of this moment is the resonance wavelength of resonance cavity system.But not the light of resonance wavelength will be from the straight-through end output of this structure, the transmission curve that therefore can obtain caving at straight-through end, thus realized the frequency-selective filtering function of micro-ring resonant cavity; And the micro-ring resonant cavity wavelength selects to have very high high sensitivity: namely the subtle change of resonator cavity effective refractive index just can cause the variation of output wavelength.
Yet all there are some shortcomings separately in existing tunable optic filter, and for example, the tuned speed of AWG tunable optic filter is slow; The filtering bandwidth of acousto-optic tunable filter is large, power consumption is high, complex structure; Etc..
Summary of the invention
The invention provides a kind of frequency-selecting filter based on micro-ring resonant cavity.Frequency-selecting filter of the present invention has that volume is little, to be easy to fibre system integrated, highly sensitive, and the advantage such as tuned speed is fast is particularly suitable for the application in the optical communication system technology.
The present invention takes following technical scheme: based on the frequency-selecting filter of micro-ring resonant cavity, comprise the first power supply (1), second source (6), the first main waveguide BW1 (7), the second main waveguide BW2 (2), the first fiber coupler C
1(8), the second fiber coupler C
2(3), a KDP modulator (4), the 2nd KDP modulator (5) and micro-ring resonant cavity (9); Micro-ring resonant cavity (9) is by the first fiber coupler C
1(8) and the first main waveguide BW1 (7) links, and wherein, the Input end is the signal input part of this frequency-selecting filter, and the Through end is one of them signal output part of this frequency-selecting filter---straight-through end.Micro-ring resonant cavity (9) is also by the second fiber coupler C
2(3) and the second main waveguide BW2 (2) links, and wherein, the Drop end is another signal output part of this frequency-selecting filter---lower terminal.A side (two fiber coupler C at micro-ring resonant cavity (9)
1And C
2Between) connection the one KDP modulator (4), opposite side (two fiber coupler C
1And C
2Between) connect the 2nd KDP modulator (5), all switch on power on two modulators, namely a KDP modulator (4) is connected the first power supply (1), and the 2nd KDP modulator (5) is connected second source (6).
Light wave is from the Input end input of the first main waveguide BW1, and part light is through coupling mechanism C
1Be coupled into ring in a subtle way, the light that satisfies condition of resonance passes through coupling mechanism C again
2Coupling, then by the left end of the second main waveguide BW2---lower terminal output, but not the light of resonance wavelength is by right-hand member---the straight-through end output of the first main waveguide BW1, thus realized the frequency-selective filtering function of this micro-ring resonant cavity configuration.
Preferably, the cross-coupling coefficient of 2 of this frequency-selecting filter fiber couplers is 0.3.
Preferably, the input of this frequency-selecting filter is continuous wave signal.
Characteristics of the present invention are to have increased by two KDP modulators in micro-ring resonant cavity.The KDP modulator is to be made of the KDP electro-optic crystal, its principle of work is based on electrooptical effect: under the effect of applying direct current electric field or low-frequency current field, the variation linear with extra electric field occurs in the refractive index of medium, makes the also variation thereupon of phase place by the light of waveguide.
The present invention utilizes the FDP modulator to realize frequency-selective filtering function based on micro-ring resonant cavity.When switching on power, due to the effect of KDP modulator, the effective refractive index of micro-ring resonant cavity changes, and causes that the phase place of the light that transmits in little ring changes, and finally will cause the variation of the resonance wavelength of micro-ring resonant cavity.The micro-ring resonant cavity wavelength selects to have very high sensitivity: namely the subtle change of resonator cavity effective refractive index just can cause the variation of output wavelength.Suitably the regulation voltage size, can realize the output of any resonance wavelength.
Frequency-selecting filter of the present invention have volume little, be easy to the advantages such as fibre system is integrated, highly sensitive, tuned speed is fast, be particularly suitable for the application in the optical communication system technology.
Description of drawings
Fig. 1 is the structural representation based on the frequency-selecting filter of micro-ring resonant cavity.
In Fig. 1, A
1Expression input light field, a
dThe lower terminal transmission light field of expression, a
tThe straight-through end of expression transmission light field.
Fig. 2 is the curve of output that there is no two output terminals of system in the impressed voltage situation.
In Fig. 2, T
dThe lower terminal transmissivity of expression, T
tThe straight-through end of expression transmissivity.
Fig. 3 is the curve of output that two impressed voltages are two output terminals of system in the 2V situation.
In Fig. 3, T
dThe lower terminal transmissivity of expression, T
tThe straight-through end of expression transmissivity.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
As shown in Figure 1, the present embodiment comprises power supply 1, power supply 6, main waveguide BW17, main waveguide BW22, fiber coupler C based on the frequency-selecting filter of micro-ring resonant cavity
18, fiber coupler C
23, KDP modulator 4, KDP modulator 5 and micro-ring resonant cavity 9.Wherein, the cross-coupling coefficient of two fiber couplers is 0.3.
Micro-ring resonant cavity 9 is by fiber coupler C
1Link with main waveguide BW1, wherein, the Input end is the signal input part of this frequency-selecting filter, and the Through end is one of them signal output part of this frequency-selecting filter---straight-through end.Micro-ring resonant cavity 9 is also by fiber coupler C
2Link with main waveguide BW2, wherein, the Drop end is another signal output part of this frequency-selecting filter---lower terminal.A side (two fiber coupler C at micro-ring resonant cavity 9
1And C
2Between) connection KDP modulator 4, opposite side (two fiber coupler C
1And C
2Between) also connect on 5, two modulators of KDP modulator and all switch on power, that is: KDP modulator 4 links with power supply 1, and KDP modulator 5 and power supply 6 link.
When Input end input continuous wave signal, part light is through fiber coupler C
1Be coupled in a subtle way ring, when transmit the phase place that produces in a week when light signal being the integral multiple of 2 π in micro-ring resonant cavity, namely satisfy condition of resonance: β L=2q π (q=1,2, light 3...) passes through fiber coupler C
2Coupling, then by the left end of main waveguide BW2---lower terminal output, but not the light of resonance wavelength is by right-hand member---the straight-through end output of main waveguide BW1.Suitably regulate the power supply size, under the effect of KDP modulator, corresponding skew can occur in the export resonance wavelength of frequency-selecting filter.
As shown in Figure 2, during U=0V, the transmissivity of the straight-through end of system and lower terminal.As shown in Figure 3, during U=2V, the transmissivity of the straight-through end of system and lower terminal.Comparison diagram 2 and Fig. 3 can find that when input voltage changes the export resonance wavelength of system is offset.Explanation can be controlled output wavelength by the size of regulating input voltage.
The frequency-selective filtering process of frequency-selecting filter of the present invention:
1, according to required wavelength of optical signal or frequency, select suitable signal wavelength to satisfy the condition of resonance of micro-ring resonant cavity.
2, according to the export resonance wavelength of straight-through end and lower terminal, adjust the power supply size, thereby obtain required resonance wavelength.
Above the preferred embodiments of the present invention and principle are had been described in detail, for those of ordinary skill in the art, according to thought provided by the invention, will change on embodiment, and these changes also should be considered as protection scope of the present invention.
Claims (3)
1. based on the frequency-selecting filter of micro-ring resonant cavity, comprise micro-ring resonant cavity (9), the first main waveguide (7), the second main waveguide (2), the first fiber coupler (8) and the second fiber coupler (3), micro-ring resonant cavity (9) links by the first fiber coupler (8) and the first main waveguide (7), wherein, the Input end of the first main waveguide (7) is the signal input part of described frequency-selecting filter, and the Through end of the first main waveguide (7) is the first signal output terminal of described frequency-selecting filter; Micro-ring resonant cavity (9) links by the second fiber coupler (3) and the second main waveguide (2), and wherein, the Drop of the second main waveguide (2) end is the secondary signal output terminal of described frequency-selecting filter; It is characterized in that: micro-ring resonant cavity (9) one sides connect a KDP modulator (4) between the first fiber coupler (8) and the second fiber coupler (3), opposite side connects the 2nd KDP modulator (5) between the first fiber coupler (8) and the second fiber coupler (3), a KDP modulator (4), the 2nd KDP modulator (5) all switch on power.
2. frequency-selecting filter as claimed in claim 1, it is characterized in that: the cross-coupling coefficient of described the first fiber coupler (8), the second fiber coupler (3) is 0.3.
3. frequency-selecting filter as claimed in claim 1 or 2, it is characterized in that: the input of described frequency-selecting filter is continuous wave signal.
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| CN201310113044.0A CN103163664B (en) | 2013-04-02 | 2013-04-02 | Based on the frequency-selecting filter of micro-ring resonant cavity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698906A (en) * | 2013-12-19 | 2014-04-02 | 杭州电子科技大学 | Frequency adjustable filter based on Mach-Zehnder electro-optic modulator |
| CN108702235A (en) * | 2016-08-24 | 2018-10-23 | 华为技术有限公司 | A kind of segmented micro-ring resonant cavity cascade unit |
| WO2019034138A1 (en) * | 2017-08-18 | 2019-02-21 | Huawei Technologies Co., Ltd. | Efficient wavelength tunable hybrid laser |
| CN110579269A (en) * | 2019-08-14 | 2019-12-17 | 中国地震局地壳应力研究所 | infrasonic wave sensor for rarefied atmosphere space and sound detection load cabin |
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2013
- 2013-04-02 CN CN201310113044.0A patent/CN103163664B/en active Active
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| CN1588143A (en) * | 2004-07-19 | 2005-03-02 | 浙江大学 | Light wave guide micro ring device coupled by bending shape oriented coupler |
| CN101000393A (en) * | 2007-01-05 | 2007-07-18 | 东南大学 | Organic polymer optical waveguide resonance ring |
| CN101004466A (en) * | 2007-01-12 | 2007-07-25 | 东南大学 | Rectangular, micro annular resonant cavity type light filter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698906A (en) * | 2013-12-19 | 2014-04-02 | 杭州电子科技大学 | Frequency adjustable filter based on Mach-Zehnder electro-optic modulator |
| CN108702235A (en) * | 2016-08-24 | 2018-10-23 | 华为技术有限公司 | A kind of segmented micro-ring resonant cavity cascade unit |
| CN108702235B (en) * | 2016-08-24 | 2019-12-24 | 华为技术有限公司 | Sectional type micro-ring resonant cavity cascade device |
| WO2019034138A1 (en) * | 2017-08-18 | 2019-02-21 | Huawei Technologies Co., Ltd. | Efficient wavelength tunable hybrid laser |
| CN110579269A (en) * | 2019-08-14 | 2019-12-17 | 中国地震局地壳应力研究所 | infrasonic wave sensor for rarefied atmosphere space and sound detection load cabin |
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| CN103163664B (en) | 2015-10-07 |
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