CN104466620A - Frequency stabilization type photoproduction microwave signal source based on optical microcavity - Google Patents
Frequency stabilization type photoproduction microwave signal source based on optical microcavity Download PDFInfo
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- CN104466620A CN104466620A CN201410826223.3A CN201410826223A CN104466620A CN 104466620 A CN104466620 A CN 104466620A CN 201410826223 A CN201410826223 A CN 201410826223A CN 104466620 A CN104466620 A CN 104466620A
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Abstract
The invention discloses a frequency stabilization type photoproduction microwave signal source based on an optical microcavity, and relates to the field of optical communication devices. The frequency stabilization type photoproduction microwave signal source comprises an optical loop and an optical coupler, wherein the optical loop is mainly composed of the optical microcavity, a band-pass filter, an optical amplifier and an optical coupler. The optical microcavity is used for forming periodic comb filtering with fixed frequency space; the band-pass filter is used for selecting two optical signals with adjacent frequencies from multi-frequency optical signals output from the optical microcavity; the optical amplifier is used for generating optical power gains in the optical loop, achieving hot shooting of the two optical signals with the adjacent frequencies, and forming double-frequency lasers; the optical coupler is used for outputting part of optical power coupling of the double-frequency lasers; a photoelectric detector is used for receiving the double-frequency lasers output by the optical couplers and obtaining photoproduction microwave signals with an optical beat frequency effect. By means of the frequency stabilization type photoproduction microwave signal source, the frequency stability of the microwave signals is improved, and the phase noise of the photoproduction microwave signals is restrained.
Description
Technical field
The present invention relates to optic communication device field, specifically relate to a kind of frequency stabilization type photo-induced microwave signal source based on optical microcavity.
Background technology
Phase noise low and the microwave of frequency-tunable or millimeter wave have a wide range of applications in a lot of field, and they comprise: radar system, radio communication, software-defined radio and modern instrument.Typically, high-frequency microwave or millimeter wave are by being obtained by the stable oscillation stationary vibration signal many times frequency multiplication of low frequency.This scheme system is complicated, cost is higher and be unfavorable for the transmission of microwave signal.In order to overcome these shortcomings, photoproduction microwave technology is arisen at the historic moment.
Light heterodyne method (Optical Heterodyning) is the photoproduction microwave technology be most widely used in Microwave photonics.Namely the most direct implementation of light heterodyne method is that independently laser is restrainted in employing two, makes its beat frequency in photo-detector.Photo-detector is a kind of square law detection device, therefore when the light that two bundle wavelength are different enters photo-detector simultaneously, they can produce beat effect wherein, produce the microwave signal that a frequency equals the difference of two-beam frequency at the electric output port of photo-detector simultaneously.As long as the responsive bandwidth of photo-detector is enough large, the above-mentioned microwave signal produced by light heterodyne method can reach THz rank in theory.But the key being obtained photoproduction microwave signal by light heterodyne method is how to obtain phase stabilization and relevant light source.Because for two independently laser (especially semiconductor laser), it exports light does not have coherence, random phase noise is very serious, and the change of respective temperature and bias current also can cause the drift of excitation wavelength, thus causes the drift of difference frequency signal frequency.The microwave signal frequency produced in this way is unstable, noise is very large, and practicality is poor.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of frequency stabilization type photo-induced microwave signal source based on optical microcavity, promote the frequency stability of microwave signal, suppress the phase noise of photoproduction microwave signal.
For reaching above object, the technical scheme that the present invention takes is: a kind of frequency stabilization type photo-induced microwave signal source based on optical microcavity, comprise the optical loop primarily of optical microcavity, band pass filter, image intensifer and optical coupler composition, and an optical coupler; The periodicity comb filtering that optical microcavity is fixed for the formation of frequency interval; Band pass filter is used for, the multi frequency optical signal exported from optical microcavity, selecting the light signal of two side frequencies; Image intensifer be used in optical loop, produce optical power gain, realize two side frequency light signals swash penetrate, formed double-frequency laser; Optical coupler is used for the part Coupling power of double-frequency laser to export; The double-frequency laser that photodetector exports for receiving optical coupler, utilizes optical beat effect to obtain photoproduction microwave signal.
On the basis of technique scheme, in optical loop, also comprise optical delay line, for increasing the length of optical loop, promote the coherence of outgoing double-frequency laser.
On the basis of technique scheme, the length of described optical delay line is more than or equal to 10
-6m and be less than or equal to 10
4m, optical loss is more than or equal to 10
-4dB/m and be less than or equal to 10
4dB/m, the material of optical delay line is silicon single crystal, Si
3n
4, SiO
xn
yor SiO
2.
On the basis of technique scheme, described optical microcavity is silicon-based micro ring type resonant cavity, and two waveguides of this optical microcavity and its outside intercouple, and forms Add/drop Voice Channel structure, realizes comb filtering function.
On the basis of technique scheme, the ratio of the optical bandwidth of described band pass filter and the free spectral width of described optical microcavity is more than or equal to 1 and is less than or equal to 3.
On the basis of technique scheme, described image intensifer is the one in erbium-doped fiber amplifier, semiconductor optical amplifier, raman optical amplifier, Brillouin light amplifier, photoparametric amplifier.
On the basis of technique scheme, the light signal that the optical gain that in described optical loop, image intensifer produces is greater than two side frequencies transmits the optical loss of a week in this optical loop.
On the basis of technique scheme, described photodetector is silicon germanium waveguide type photodetector, and its responsive bandwidth is more than or equal to the free spectral width of optical microcavity.
On the basis of technique scheme, described photodetector is individual devices, or integrated with the random devices in optical loop.
On the basis of technique scheme, the optical microcavity in described optical loop, band pass filter, image intensifer and optical coupler are respective individual devices, or part/all on the same chip integrated.
Beneficial effect of the present invention is:
Penetrate formation double-frequency laser because two side frequency light signals swash, all produced by same optical microcavity and optical loop, therefore there is high correlation.
In addition, the difference on the frequency of double-frequency laser is equal to the free spectral width of optical microcavity, determined by the group index of optical microcavity and girth, can not the factor such as Yin Wendu, vibration impact and change, promote the frequency stability of microwave signal.
Moreover it is long that the optical delay line in optical loop adds chamber, make double-frequency laser live width constriction, improve the coherence of laser, therefore, described double-frequency laser is when carrying out difference frequency, and can suppress the phase noise of photoproduction microwave signal, frequency stability significantly promotes.
Accompanying drawing explanation
Fig. 1 is the frequency stabilization type photo-induced microwave signal source schematic diagram of the embodiment of the present invention based on optical microcavity;
Fig. 2 is the schematic diagram of optical microcavity output spectrum in the embodiment of the present invention;
Fig. 3 is the spectrum schematic diagram in the embodiment of the present invention after optical microcavity and band pass filter;
Fig. 4 is the double-frequency laser measured light spectrogram that in the embodiment of the present invention, optical coupler exports.
Reference numeral:
10-optical loop, 11-optical microcavity, 12-band pass filter, 13-image intensifer, 14-optical delay line, 15-optical coupler, 20-photo-detector.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the present invention is based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, comprise optical loop 10 and photodetector 20 two parts, optical loop 10 forms primarily of optical microcavity 11, band pass filter 12, image intensifer 13 and optical coupler 15, in the present embodiment, optical loop 10 also comprises optical delay line 14.Optical loop 10 is for generation of the different laser of two frequencies, i.e. double-frequency laser, photodetector 20 is for receiving the double-frequency laser exported from optical coupler 15, and recycling optical difference frequency effect obtains photoproduction microwave signal.
Concrete, optical microcavity 11 is for periodically choosing the fixing light of multiple frequency difference, the periodicity comb filtering that forming frequency interval is fixing.Optical microcavity 11 can based on silicon, Si
3n
4, SiO
xn
y(silicon oxynitride) or SiO
2material makes, and also can make based on other optical waveguide materials; Shape can be annular, dish-type or other echo wall-like structure, and optical microcavity 11 intercouples with two waveguides of its outside, forms Add/drop Voice Channel structure, realizes comb filtering function.Comparatively preferred, optical microcavity 11 is silicon-based micro ring type resonant cavity, is processed to form on Silicon Wafer by CMOS compatible technology.Silicon-based micro ring type resonant cavity realizes selection to optical wavelength, and the wavelength meeting micro-ring resonant condition can export from the waveguide of micro-ring other end, and other cannot the wavelength of resonance then be stopped.
As shown in Figure 2, the resonance peak in micro-ring transmission spectrum periodically occurs, FSR (FreeScale Range, free spectral width) is namely defined as the peak-to-peak optical frequency rate variance of adjacent resonance, can be expressed as:
Wherein, R is micro-ring radius, n
gfor group index, c is the propagation velocity of light in vacuum.As can be seen here, the FSR of the adjacent resonance peak of silicon-based micro ring type resonant cavity, only determined by the group index of micro-ring radius and ring waveguide, and both has all determined after micro-ring machines, the frequency difference between the light signal thus exported is very stable.
Band pass filter 12 is in the multi frequency optical signal that exports from optical microcavity 11, filtering selects the light signal of two side frequencies, block the light signal of all the other frequencies, therefore other light signals cannot form resonance in optical loop, make in optical loop 10, only have the light of two frequencies to realize sharp penetrating, as shown in Figure 3, for after optical microcavity 11 and the common filtering of band pass filter 12, the spectrum schematic diagram of output.The ratio of the optical bandwidth of described band pass filter 12 and the FSR of described optical microcavity 11 is more than or equal to 1 and is less than or equal to 3.
Image intensifer 13, for producing optical power gain in optical loop 10, is supplied to two side frequency light signals that band pass filter 12 leaches, realize two side frequency light signals swash penetrate, formed double-frequency laser.The light signal that the optical gain that in described optical loop 10, image intensifer 13 produces is greater than two side frequencies transmits the optical loss of a week in this optical loop 10.Image intensifer 13 can be the one in erbium-doped fiber amplifier, semiconductor optical amplifier, raman optical amplifier, Brillouin light amplifier, photoparametric amplifier, erbium-doped fiber amplifier is preferably in the present embodiment, in optical loop 10, produce optical power gain, make two side frequency light signals reach sharp and penetrate condition.
Optical delay line 14, for increasing the length of optical loop 10, promotes the coherence of outgoing double-frequency laser.The length of optical delay line 14 is more than or equal to 10
-6m and be less than or equal to 10
4m, optical loss is more than or equal to 10
-4dB/m and be less than or equal to 10
4dB/m, the material of optical delay line 14 is silicon single crystal, Si
3n
4, SiO
xn
yor SiO
2.
Optical coupler 15, for by the part Coupling power of double-frequency laser in optical loop 10 out, is input in photodetector 20.As shown in Figure 4, for the double-frequency laser measured light spectrogram that optical coupler 15 exports, show, by optical microcavity 11 and band pass filter 12 acting in conjunction, to only produce the laser of two frequencies in optical loop 10, the frequency interval of these two laser is determined by the FSR of optical microcavity 11.
The double-frequency laser that photodetector 20 exports for receiving optical coupler 15, optical difference frequency effect is utilized to produce photoproduction microwave signal, the frequency of photoproduction microwave signal equals the FSR of optical microcavity 11, because temperature and external disturbance can not have an impact to the FSR of optical microcavity 11 substantially, therefore the frequency of described photoproduction microwave signal is comparatively stable.The material of photodetector 20 can be other photodetection materials such as InGaAsP compound semiconductor, GeSnSi compound semiconductor or Graphene.In the present embodiment, photodetector 20 is silicon germanium waveguide type photodetector, and its responsive bandwidth is more than or equal to the FSR of optical microcavity 11.
The present invention is based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, each device in optical loop 10 can be independently device, or is partially integrated in same chip or module, or all devices are integrated in a chip.Photodetector 20 can be individual devices, also can be integrated with the random devices in optical loop 10.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. based on a frequency stabilization type photo-induced microwave signal source for optical microcavity, it is characterized in that, comprise the optical loop primarily of optical microcavity, band pass filter, image intensifer and optical coupler composition, and an optical coupler; The periodicity comb filtering that optical microcavity is fixed for the formation of frequency interval; Band pass filter is used for, the multi frequency optical signal exported from optical microcavity, selecting the light signal of two side frequencies; Image intensifer be used in optical loop, produce optical power gain, realize two side frequency light signals swash penetrate, formed double-frequency laser; Optical coupler is used for the part Coupling power of double-frequency laser to export; The double-frequency laser that photodetector exports for receiving optical coupler, utilizes optical beat effect to obtain photoproduction microwave signal.
2. as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: in optical loop, also comprise optical delay line, for increasing the length of optical loop, promote the coherence of outgoing double-frequency laser.
3., as claimed in claim 2 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: the length of described optical delay line is more than or equal to 10
-6m and be less than or equal to 10
4m, optical loss is more than or equal to 10
-4dB/m and be less than or equal to 10
4dB/m, the material of optical delay line is silicon single crystal, Si
3n
4, SiO
xn
yor SiO
2.
4. as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: described optical microcavity is silicon-based micro ring type resonant cavity, two waveguides of this optical microcavity and its outside intercouple, and form Add/drop Voice Channel structure, realize comb filtering function.
5., as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: the ratio of the optical bandwidth of described band pass filter and the free spectral width of described optical microcavity is more than or equal to 1 and is less than or equal to 3.
6., as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: described image intensifer is the one in erbium-doped fiber amplifier, semiconductor optical amplifier, raman optical amplifier, Brillouin light amplifier, photoparametric amplifier.
7. as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: the light signal that the optical gain that in described optical loop, image intensifer produces is greater than two side frequencies transmits the optical loss of a week in this optical loop.
8. as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: described photodetector is silicon germanium waveguide type photodetector, and its responsive bandwidth is more than or equal to the free spectral width of optical microcavity.
9., as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: described photodetector is individual devices, or integrated with the random devices in optical loop.
10. as claimed in claim 1 based on the frequency stabilization type photo-induced microwave signal source of optical microcavity, it is characterized in that: the optical microcavity in described optical loop, band pass filter, image intensifer and optical coupler are respective individual devices, or part/all on the same chip integrated.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322438A (en) * | 2015-12-11 | 2016-02-10 | 武汉邮电科学研究院 | Narrow-linewidth adjustable external cavity laser based on silicon substrate |
| CN105896235A (en) * | 2016-06-08 | 2016-08-24 | 中国科学技术大学 | Optoelectronic oscillator based on multilayer film echo wall mode optical microcavity |
| CN108426631A (en) * | 2018-02-09 | 2018-08-21 | 北京航空航天大学 | A kind of vibration measurement method and system of optics Echo Wall formula micro resonant cavity |
| CN108646350A (en) * | 2018-03-30 | 2018-10-12 | 中国科学技术大学 | Mechanical vibrator microcavity coupling body and use its optical circulators |
| CN108982418A (en) * | 2018-07-02 | 2018-12-11 | 北京无线电计量测试研究所 | Measuring device of refraction index of air and method based on microcavity laser dispersion interferometry |
| CN111060905A (en) * | 2020-01-15 | 2020-04-24 | 中国人民解放军空军预警学院 | Microwave photon active passive silent radar based on microcavity and full-medium antenna array |
| CN111628398A (en) * | 2020-04-08 | 2020-09-04 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Device for generating low-noise double-frequency laser and photo-generated microwave |
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| CN114447750A (en) * | 2021-12-23 | 2022-05-06 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locked laser |
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| CN105322438B (en) * | 2015-12-11 | 2018-09-18 | 武汉邮电科学研究院 | A kind of narrow linewidth adjustable extemal cavity laser based on silicon substrate |
| CN105322438A (en) * | 2015-12-11 | 2016-02-10 | 武汉邮电科学研究院 | Narrow-linewidth adjustable external cavity laser based on silicon substrate |
| CN105896235B (en) * | 2016-06-08 | 2019-04-05 | 中国科学技术大学 | Optical-electronic oscillator based on multilayer film echo wall mode optical micro-cavity |
| CN105896235A (en) * | 2016-06-08 | 2016-08-24 | 中国科学技术大学 | Optoelectronic oscillator based on multilayer film echo wall mode optical microcavity |
| CN108426631A (en) * | 2018-02-09 | 2018-08-21 | 北京航空航天大学 | A kind of vibration measurement method and system of optics Echo Wall formula micro resonant cavity |
| CN108426631B (en) * | 2018-02-09 | 2020-06-26 | 北京航空航天大学 | Vibration measurement method and system of optical echo wall type micro resonant cavity |
| CN108646350A (en) * | 2018-03-30 | 2018-10-12 | 中国科学技术大学 | Mechanical vibrator microcavity coupling body and use its optical circulators |
| CN108646350B (en) * | 2018-03-30 | 2019-10-25 | 中国科学技术大学 | Mechanical vibrator microcavity coupling body and the optical circulators for using it |
| CN108982418A (en) * | 2018-07-02 | 2018-12-11 | 北京无线电计量测试研究所 | Measuring device of refraction index of air and method based on microcavity laser dispersion interferometry |
| CN111060905A (en) * | 2020-01-15 | 2020-04-24 | 中国人民解放军空军预警学院 | Microwave photon active passive silent radar based on microcavity and full-medium antenna array |
| CN111628398A (en) * | 2020-04-08 | 2020-09-04 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Device for generating low-noise double-frequency laser and photo-generated microwave |
| CN112924908A (en) * | 2021-01-26 | 2021-06-08 | 北京邮电大学 | Magnetic field gradient detection method based on magneto-optical effect in optical microcavity |
| CN112924908B (en) * | 2021-01-26 | 2021-11-09 | 北京邮电大学 | Magnetic field gradient detection method based on magneto-optical effect in optical microcavity |
| CN114447750A (en) * | 2021-12-23 | 2022-05-06 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locked laser |
| CN114447750B (en) * | 2021-12-23 | 2024-01-09 | 香港理工大学深圳研究院 | Microwave signal generation method and system based on microcavity feedback locking laser |
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Application publication date: 20150325 |