CN104934840A - Microwave oscillator based on sapphire filter - Google Patents
Microwave oscillator based on sapphire filter Download PDFInfo
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- CN104934840A CN104934840A CN201510357609.9A CN201510357609A CN104934840A CN 104934840 A CN104934840 A CN 104934840A CN 201510357609 A CN201510357609 A CN 201510357609A CN 104934840 A CN104934840 A CN 104934840A
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Abstract
The invention discloses a microwave oscillator based on a sapphire filter. The microwave oscillator comprises a laser unit 1, an electrooptical modulator 2, an optical fiber delay 3, the sapphire filter 4, an optical amplifier 5, an optical detector 6, a microwave amplifier 7 and a microwave power coupler 8, wherein the laser unit 1 is used for outputting an optical carrier wave signal; the electrooptical modulator 2 is used for modulating the optical carrier wave signal; the optical fiber delay 3 is used for regulating a phase between optical paths; the sapphire filter 4 is used for filtering an optical signal and an electric signal; the optical amplifier 5 is used for amplifying the optical signal filtered by the sapphire filter; the optical detector 6 is used for converting the amplified optical signal into the electric signal; the microwave amplifier 7 is used for amplifying the electric signal filtered by the sapphire filter, so that gain of the microwave oscillator is greater than an oscillation threshold value; and the microwave power coupler 8 is used for outputting a microwave signal. The microwave oscillator is an optoelectronic oscillator with an optical filter and an electric filter, and has the advantages of a compact structure, low cost, and low medium-far end phase noises.
Description
Technical field
The present invention relates to optoelectronic information field.More specifically, a kind of microwave oscillator based on sapphire filter is related to.
Background technology
The Microwave Frequency Source of Low phase noise, high stability is widely used with radar, communicate the field such as to measure.Low temperature (4k) sapphire Microwave Frequency Source has extremely low phase noise (at X-band, and excellent short-term stability (<1E-151s) <-160dBc/Hz10kHz), but due to low temperature sapphire microwave source cost and the high and volume of maintenance cost large, be only applicable to laboratory environment at present.Optical-electronic oscillator adopts photoelectric feedback loop technology, laser energy is converted to microwave signal energy, optical-electronic oscillator is a kind of high performance microwave signal generation apparatus, and optical-electronic oscillator can obtain making an uproar mutually of-163dBc/Hz10kHz when output frequency 8 ~ 12GHz.Optical-electronic oscillator, for traditional oscillator, has extremely low phase noise, has broken away from traditional microwave oscillator and has raised with frequency the restriction that performance can reduce of making an uproar mutually, become a kind of high-quality microwave signal source.But because current long optical fibers optical-electronic oscillator is subject to the impact of external environment as the factor such as temperature, mechanical oscillation, thus there is certain defect.
Therefore, develop a kind of optical-electronic oscillator based on optical resonator at present, as patents such as CN201510103877, CN201410493333, CN104659637A, but light filtering that what above-mentioned patent adopted is all and electrofiltration wavelength-division from form, wherein light filtering part adopts optical fiber, Micro-ring structure or miniature hdd structure, and electrofiltration ripple generally adopts cavity body filter or microstrip filter.This structure that wherein electric light is separated causes oscillator structure compact not, and the performance of electrofiltration ripple is not high, Q value is lower.
Summary of the invention
The technical problem to be solved in the present invention is to provide the microwave oscillator based on sapphire filter of Low phase noise under a kind of normal temperature.
For solving above-mentioned first technical problem, the present invention adopts following technical proposals:
Based on a microwave oscillator for sapphire filter, comprising:
Laser, for exporting optical carrier;
Electrooptic modulator, for modulating described optical carrier;
Optical-fiber time-delay device, for adjusting the phase place between light path;
Sapphire filter, for the filtering to light signal and the signal of telecommunication;
Image intensifer, for amplifying the carrying out of the light signal after described sapphire filter filtering;
Photo-detector, for converting the signal of telecommunication to the light signal after amplification;
Microwave amplifier, for amplifying the signal of telecommunication after sapphire filter filtering, makes the gain of microwave oscillator be greater than vibration threshold values;
Microwave power coupler, for the output of microwave signal.Wherein said sapphire filter first carries out filtering to light signal and then carries out filtering to the signal of telecommunication, not only so just achieve a filter and carry out filtering to light signal but also to the signal of telecommunication, sapphire filter is made to have the effect of optical signal filtering device and electrical signal filter concurrently, thus the compact conformation of microwave oscillator of the present invention.
Preferably, the sapphire crystal in described sapphire filter all runs on Whispering-gallery-mode under required microwave frequency and light frequency.Thus make sapphire filter there is high Q value, the middle far-end of this microwave oscillator is made an uproar low mutually.
Preferably, for the crystal of microwave filtering and light filtering, there is different radiuses in described sapphire crystal.
Beneficial effect of the present invention is as follows:
The present invention is a kind of optical-electronic oscillator based on having light and electrical filter concurrently, has compact conformation, low, the middle far-end of cost makes an uproar low advantage mutually.The present invention adopts the structure of electric light filtering one, volume compact, and the filtering performance in photoelectricity territory is high, can obtain higher index and export.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 illustrates structured flowchart of the present invention.
Fig. 2 illustrates the vertical view of sapphire filter in the present invention.
Fig. 3 illustrates the front view of sapphire filter in the present invention.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
As shown in Figure 1, a kind of microwave oscillator based on sapphire filter, comprising: laser 1, for exporting optical carrier; Electrooptic modulator 2, for modulating described optical carrier; Optical-fiber time-delay device 3, for adjusting the phase place between light path; Sapphire filter 4, for the filtering to light signal and the signal of telecommunication; Image intensifer 5, for amplifying the carrying out of the light signal after described sapphire filter filtering; Photo-detector 6, for converting the signal of telecommunication to the light signal after amplification; Microwave amplifier 7, for amplifying the signal of telecommunication after sapphire filter filtering, makes the gain of microwave oscillator be greater than vibration threshold values; Microwave power coupler 8, for the output of microwave signal.
Laser 1 exports optical carrier to electrooptic modulator 2, electrooptic modulator 2 pairs of optical carriers are sent to optical-fiber time-delay device 3 after modulating, sapphire filter 4 is transferred to after optical-fiber time-delay device 3 pairs of optical carriers enter horizontal phasing control, sapphire filter 4 pairs of optical carriers carry out filtering, filtered optical carrier is sent to image intensifer 5, photo-detector 6 is transferred to after image intensifer 5 pairs of optical carriers amplify, photo-detector 6 is transferred to sapphire filter 4 and carries out filtering after converting optical carrier to the signal of telecommunication, filtered electric signal transmission amplifies to microwave amplifier 7, electric signal transmission after amplification is to microwave power coupler 8, signal of telecommunication Single port after micro-wave coupler 8 exports microwave signal, another port is carried on electrooptic modulator 2, form whole loop.
As shown in Figure 2 and Figure 3, sapphire filter 4 comprises metallic shield cavity 9 and is positioned at the sapphire crystal 10 of its inside, and metallic shield cavity 9 is provided with microwave input port A, microwave output port B, light input end mouth C and optical output port D.Sapphire crystal 10 all runs on Whispering-gallery-mode under required microwave frequency and light frequency, if the FSR of area of light is less when designing, can make shaped sapphire crystal, the crystal of the crystal and light filtering that are used in microwave filtering has different radiuses, as the region of E part in Fig. 3.The microwave input/output port of sapphire filter 4 can adopt probe coupling and coupling loop to be coupled two kinds of modes, and optical fiber input/output port can adopt coupling fiber, prism wedge and grating coupled mode.After connecting according to the structured flowchart of Fig. 1, microwave spectrometer is connected, by regulating optical-fiber time-delay device 3, when output port can observe microwave signal at the output port of microwave power coupler 8, this system can normally work, and just can obtain the microwave signal of Low phase noise at output port.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all execution modes, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (3)
1. based on a microwave oscillator for sapphire filter, it is characterized in that, comprising:
Laser, for exporting optical carrier;
Electrooptic modulator, for modulating described optical carrier;
Optical-fiber time-delay device, for adjusting the phase place between light path;
Sapphire filter, for the filtering to light signal and the signal of telecommunication;
Image intensifer, for amplifying the carrying out of the light signal after described sapphire filter filtering;
Photo-detector, for converting the signal of telecommunication to the light signal after amplification;
Microwave amplifier, for amplifying the signal of telecommunication after sapphire filter filtering, makes the gain of microwave oscillator be greater than vibration threshold values;
Microwave power coupler, for the output of microwave signal.
2. the microwave oscillator of a kind of several sapphire filters according to claim 1, is characterized in that, the sapphire crystal in described sapphire filter all runs on Whispering-gallery-mode under required microwave frequency and light frequency.
3. the microwave oscillator of a kind of several sapphire filters according to claim 2, is characterized in that, has different radiuses in described sapphire crystal for the crystal of microwave filtering and light filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510357609.9A CN104934840A (en) | 2015-06-25 | 2015-06-25 | Microwave oscillator based on sapphire filter |
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| CN201510357609.9A CN104934840A (en) | 2015-06-25 | 2015-06-25 | Microwave oscillator based on sapphire filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106374322A (en) * | 2016-09-28 | 2017-02-01 | 北京无线电计量测试研究所 | Multi-phase-locked filter structure-based optoelectronic oscillator |
| CN107069390A (en) * | 2017-06-02 | 2017-08-18 | 北京邮电大学 | Optical-electronic oscillator |
| CN111146669A (en) * | 2018-11-05 | 2020-05-12 | 中国科学院半导体研究所 | On-chip integrated double-ring photoelectric oscillator |
| CN114499670A (en) * | 2021-12-31 | 2022-05-13 | 北京无线电计量测试研究所 | Microwave signal processing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374322A (en) * | 2016-09-28 | 2017-02-01 | 北京无线电计量测试研究所 | Multi-phase-locked filter structure-based optoelectronic oscillator |
| CN107069390A (en) * | 2017-06-02 | 2017-08-18 | 北京邮电大学 | Optical-electronic oscillator |
| CN107069390B (en) * | 2017-06-02 | 2019-04-12 | 北京邮电大学 | Optical-electronic oscillator |
| CN111146669A (en) * | 2018-11-05 | 2020-05-12 | 中国科学院半导体研究所 | On-chip integrated double-ring photoelectric oscillator |
| CN114499670A (en) * | 2021-12-31 | 2022-05-13 | 北京无线电计量测试研究所 | Microwave signal processing device |
| CN114499670B (en) * | 2021-12-31 | 2023-09-15 | 北京无线电计量测试研究所 | Microwave signal processing device |
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Application publication date: 20150923 |