CN108055035B - Broadband frequency extension device of photoelectric oscillator - Google Patents
Broadband frequency extension device of photoelectric oscillator Download PDFInfo
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- CN108055035B CN108055035B CN201711435135.0A CN201711435135A CN108055035B CN 108055035 B CN108055035 B CN 108055035B CN 201711435135 A CN201711435135 A CN 201711435135A CN 108055035 B CN108055035 B CN 108055035B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
The invention discloses a broadband frequency extension device of a photoelectric oscillator, which comprises: the phase-locked loop comprises a narrow-band photoelectric oscillator, a frequency divider, a first phase-locked loop and a second phase-locked loop, wherein the narrow-band photoelectric oscillator is respectively connected with the input ends of the frequency divider and the first phase-locked loop; the input end of the second phase-locked loop is respectively connected with the output ends of the first phase-locked loop and the frequency divider; and signals output by the narrow-band photoelectric oscillator are output after being subjected to frequency conversion through the first phase-locked loop and the second phase-locked loop respectively. The invention solves the problem that the phase noise of the reference source synthesized by the traditional frequency can not meet the requirement of sufficient transmission; by the multi-ring frequency expansion technology, the problem that the output frequency of the photoelectric oscillator is narrow and cannot meet the requirement of broadband calibration is solved.
Description
Technical Field
The present invention relates to the field of optoelectronics. And more particularly, to a broadband frequency extending apparatus of an optoelectronic oscillator.
Background
In the microwave and millimeter wave frequency range, the low-phase noise reference sources on the market at present mainly comprise introduced HP8663A/B, E8257D, SMA/B series and the like, and the components of the reference sources mainly comprise a low-noise time base link, a harmonic generator, a baseband signal, an intermediate frequency unit, an up-conversion unit, a down-conversion unit and a display control system. The most significant disadvantage of these microwave and millimeter wave reference sources, which adopt the conventional frequency synthesis scheme, is that the phase noise level is greatly reduced as the output frequency is increased. And with the improvement of the development level of the phase noise of the microwave millimeter wave source to be detected, the phase noise level of the microwave millimeter wave reference source cannot meet the 10dB volume transmission requirement, and the phase noise of the source to be detected can only be calibrated in a comparison mode, so that the phase noise of the microwave millimeter wave source cannot be traced. Since the optical cavity has a much better quality factor than the conventional microwave cavity, the phase noise of the optoelectronic oscillator (OEO) is very superior, and the most significant advantage is that the phase noise of the output signal is not deteriorated with increasing frequency. Although the phase noise of the optoelectronic oscillator is very excellent, the biggest disadvantage is that the output frequency is narrow-band and cannot meet the measurement requirement of wide band.
The problems of the reference source in the domestic microwave and millimeter wave frequency range are as follows: 1. the phase noise of the reference source of the traditional frequency synthesis cannot meet the requirement of sufficient transmission; 2. the output frequency of the optoelectronic oscillator is narrow, and the requirement of broadband calibration cannot be met.
Therefore, it is desirable to provide a broadband frequency extending apparatus for an optoelectronic oscillator.
Disclosure of Invention
The invention aims to provide a broadband frequency extension device of a photoelectric oscillator, which is particularly suitable for being used as a phase noise calibration reference source in a microwave millimeter wave frequency range and can solve the problem that the reference source is difficult to select in the phase noise calibration process of the microwave millimeter wave source at present.
In order to achieve the purpose, the invention adopts the following technical scheme:
a broadband frequency extending apparatus of an optoelectronic oscillator, comprising: a narrow-band optoelectronic oscillator, a frequency divider, a first phase-locked loop, a second phase-locked loop, wherein,
the narrow-band photoelectric oscillator is respectively connected with the frequency divider and the input end of the first phase-locked loop;
the input end of the second phase-locked loop is respectively connected with the output ends of the first phase-locked loop and the frequency divider;
and signals output by the narrow-band photoelectric oscillator are output after being subjected to frequency conversion through the first phase-locked loop and the second phase-locked loop respectively.
Further, the first phase-locked loop includes: the phase detector comprises a first mixer, a first phase detector and a first loop filter, wherein the input end of the first phase detector is connected with the first mixer, and the output end of the first phase detector is connected with the input end of the first loop filter.
Further, the first phase-locked loop further comprises a power divider, wherein the input end of the power divider is connected with the narrow-band optoelectronic oscillator, and the output end of the power divider is connected with the first mixer.
Further, the first phase locked loop further comprises a direct digital frequency synthesizer for reducing the signal frequency, wherein the input end of the direct digital frequency synthesizer is connected with the power divider, and the output end of the direct digital frequency synthesizer is connected with the first phase detector.
Furthermore, the first phase-locked loop also comprises a voltage-controlled oscillator for expanding the signal frequency range, wherein the input end of the voltage-controlled oscillator is connected with the output end of the first loop filter, and the output end of the voltage-controlled oscillator is connected with the second phase-locked loop.
Further, the second phase locked loop includes: the input end of the second phase discriminator is connected with the second mixer, and the output end of the second phase discriminator is connected with the input end of the second loop filter.
Furthermore, the second phase-locked loop also comprises a sampling medium oscillator for expanding the frequency bandwidth of the signal, wherein the input end of the sampling medium oscillator is connected with the output end of the second loop filter, and the sampling medium oscillator outputs the signal with the expanded frequency range.
Furthermore, the device also comprises a third phase-locked loop formed by a third mixer, a third phase discriminator, a third loop filter and a YIG oscillator, wherein the sampling medium oscillator is connected with the input end of the third mixer and sends the signal after the frequency of the second phase-locked loop is expanded to the third mixer.
Furthermore, the output end of the frequency divider is respectively connected with the second phase discriminator and the third phase discriminator, and the signals output by the narrow-band photoelectric oscillator are respectively compared with the signals output by the corresponding second frequency mixer and the third frequency mixer in phase.
Further, the third phase-locked loop further comprises a frequency division multiplier, and the output end of the YIG oscillator is connected with the frequency division multiplier to expand and output the signal frequency.
The invention has the following beneficial effects:
the broadband frequency extension device of the viewpoint oscillator solves the problem that a reference source is difficult to select in the phase noise calibration process of the existing microwave millimeter wave source, and has the following advantages that: 1. the problem that the phase noise of a reference source synthesized by the traditional frequency cannot meet the requirement of sufficient transmission is solved; 2. by the multi-ring frequency expansion technology, the problem that the output frequency of the photoelectric oscillator is narrow and cannot meet the requirement of broadband calibration is solved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings;
fig. 1 is a schematic diagram of a wideband frequency spreading device of an optoelectronic oscillator according to the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, the present invention discloses a wideband frequency spreading apparatus for an optoelectronic oscillator, comprising: a narrow band opto-electronic oscillator 1, a frequency divider 2, a first phase locked loop 11, a second phase locked loop 22, wherein,
the narrow-band photoelectric oscillator 1 is respectively connected with the frequency divider 2 and the input end of the first phase-locked loop 11;
the input end of the second phase-locked loop 22 is respectively connected with the output ends of the first phase-locked loop 11 and the frequency divider 2;
the signals output by the narrow-band photoelectric oscillator 1 are output after being subjected to phase-loop frequency conversion through the first phase-locked loop 11 and the second phase-locked loop 22 respectively.
Wherein the first phase-locked loop 11 includes: the phase detector comprises a first mixer 4, a first phase detector 6 and a first loop filter 7, wherein the input end of the first phase detector 6 is connected with the first mixer 4, and the output end of the first phase detector 6 is connected with the input end of the first loop filter 7. The first phase-locked loop 11 further comprises a power divider 3, a direct digital frequency synthesizer (DDS)5, and a voltage-controlled oscillator 8, wherein the input end of the power divider 3 is connected to the narrowband optoelectronic oscillator 1, and the output end is connected to the first mixer 4; the input end of the direct digital frequency synthesizer 5 is connected with the power divider 3, and the output end of the direct digital frequency synthesizer is connected with the first phase detector 6; the input of the voltage controlled oscillator 8 is connected to the output of the first loop filter 7 and the output is connected to the second phase locked loop 22.
When the narrow-band photoelectric oscillator works, after an output signal of the narrow-band photoelectric oscillator 1 passes through the power divider 3, one path of the output signal is subjected to fundamental wave mixing down-conversion through the first mixer 4, an intermediate frequency signal obtained after down-conversion and a subdivided frequency distinguishing signal generated by the direct digital frequency synthesizer 5 are subjected to phase discrimination through the first phase discriminator 6, a clock of the direct digital frequency synthesizer 5 is provided by the other path of the narrow-band photoelectric oscillator 1 after power division, an error signal after the phase discrimination is integrated through the first loop filter 7 and then fed back to control the voltage-controlled oscillator 8, after a loop is locked, a signal of the narrow-band photoelectric oscillator 1 is locked on the voltage-controlled oscillator 8, the loop bandwidth is set to be wide and is near 1MHz, thus, the phase noise characteristic of the output signal of the first phase-locked loop 11 is maintained within the frequency deviation of 1MHz, and the low phase noise characteristic of the narrow-band optoelectronic oscillator 1 signal is maintained. Beyond a frequency offset of 1MHz, the phase noise is determined by the voltage controlled oscillator 8. The first phase locked loop 11 is used to combine the wide frequency characteristic of a conventional voltage controlled oscillator with the low phase noise characteristic of an optoelectronic oscillator. The frequency of the narrow-band photoelectric oscillator 1 is subjected to frequency expansion through a voltage-controlled oscillator 8, and the bandwidth is about 200 MHz.
The second phase locked loop 22 includes: the phase detector comprises a second mixer 9, a second phase detector 10 and a second loop filter 11, wherein the input end of the second phase detector 10 is connected with the second mixer 9, and the output end of the second phase detector is connected with the input end of the second loop filter 11. The second phase-locked loop 22 further includes a sampling medium oscillator 12 for expanding the frequency bandwidth of the signal, and an input end of the sampling medium oscillator 12 is connected to an output end of the second loop filter 11 to output the signal with the expanded frequency range.
During operation, the voltage-controlled oscillator 8 and the second mixer 9 which are locked by the first phase-locked loop 11 carry out fundamental wave mixing down-conversion, an intermediate frequency signal obtained after down-conversion and a signal of the narrow-band photoelectric oscillator 1 which is frequency-divided by the frequency divider 2 carry out phase discrimination through the second phase discriminator 10, an error signal obtained by phase discrimination is integrated through the second loop filter 11, the integrated error signal feedback controls the sampling medium oscillator 12, after loop locking, the narrow-band photoelectric oscillator 1 is locked on the sampling medium oscillator 12, the second phase-locked loop 22 locks a signal output by the first phase-locked loop 11 and the sampling medium oscillator 12 through a microwave phase-locked loop, a signal with a 200MHz bandwidth generated by the first phase-locked loop 11 is expanded to about 1100MHz bandwidth, the loop bandwidth is set to be greater than 1MHz, thus, the phase noise characteristic of a signal output by the second phase-locked loop 22, the phase noise characteristics of the output signal of the first phase locked loop 11 are replicated within the loop bandwidth, outside of which the phase noise is determined by the performance of the sampling medium oscillator 12. Thus, the characteristic of the low-noise photoelectric oscillator is combined with the oscillator voltage-controlled oscillator and the sampling medium oscillator, the phase noise characteristic of the photoelectric oscillator is kept, and the frequency expansion is carried out by utilizing the characteristic that the frequency bands of the voltage-controlled oscillator and the sampling medium oscillator are wider.
The broadband frequency spreading device of the optoelectronic oscillator further comprises a third phase-locked loop 33 composed of a third mixer 13, a third phase detector 14, a third loop filter 15 and a YIG oscillator 16, wherein the sampling medium oscillator 12 is connected with the input end of the third mixer 13, and sends the signal subjected to frequency spreading of the second phase-locked loop 22 to the third mixer 13. The third phase-locked loop 33 further includes a frequency division multiplier 17, and the output end of the YIG oscillator 16 is connected to the frequency division multiplier 17, and outputs the expanded signal frequency.
During operation, the sampling medium oscillator 12 and the third mixer 13 which are locked by the second phase-locked loop 33 perform fundamental wave mixing down-conversion, an intermediate frequency signal obtained after down-conversion and another path of signal of the narrow-band optoelectronic oscillator 1 which is frequency-divided by the frequency divider 2 perform phase discrimination through the third phase discriminator 14, an error signal obtained by the phase discrimination is integrated through the third loop filter 15, the integrated error signal is fed back to control the YIG oscillator 16, after loop locking, the narrow-band optoelectronic oscillator is locked on the YIG oscillator 16, the third phase-locked loop 33 locks a signal output by the second phase-locked loop 22 and the YIG oscillator 16 through a microwave phase-locked loop, and a signal with a bandwidth of 1100MHz generated by the second phase-locked loop 22 is expanded to a bandwidth (10-20) GHz, so that the phase noise characteristic of the signal output by the third phase-locked loop 33 duplicates the phase noise characteristic of the signal output by the second phase-locked loop 22 in the loop bandwidth, outside the loop bandwidth, the phase noise is determined by the performance of the YIG oscillator 16.
Because the voltage-controlled oscillator, the sampling medium oscillator and the YIG oscillator are different in use frequency band, the characteristics of the low-phase-noise photoelectric oscillator in different frequency bands are combined with the voltage-controlled oscillator, the sampling medium oscillator and the YIG oscillator, the phase noise characteristics of the photoelectric oscillator are kept, and the frequency expansion is carried out by utilizing the characteristics of wider frequency bands of the voltage-controlled oscillator, the sampling medium oscillator and the YIG oscillator.
The broadband frequency extension device of the viewpoint oscillator solves the problem that a reference source is difficult to select in the phase noise calibration process of the existing microwave millimeter wave source, and has the following advantages that: the problem that the phase noise of a reference source synthesized by the traditional frequency cannot meet the requirement of sufficient transmission is solved; by the multi-ring frequency expansion technology, the problem that the output frequency of the photoelectric oscillator is narrow and cannot meet the requirement of broadband calibration is solved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (4)
1. A broadband frequency extending apparatus of an optoelectronic oscillator, comprising: a narrow-band optoelectronic oscillator, a frequency divider, a first phase-locked loop, a second phase-locked loop, wherein,
the narrow-band photoelectric oscillator is respectively connected with the frequency divider and the input end of the first phase-locked loop;
the input end of the second phase-locked loop is respectively connected with the output ends of the first phase-locked loop and the frequency divider;
the signals output by the narrow-band photoelectric oscillator are output after being subjected to frequency conversion through a first phase-locked loop and a second phase-locked loop respectively;
the first phase-locked loop includes: the input end of the first phase detector is connected with the first mixer, and the output end of the first phase detector is connected with the input end of the first loop filter;
the first phase locked loop further comprises a power divider, a direct digital frequency synthesizer to reduce the frequency of the signal and a voltage controlled oscillator to extend the frequency range of the signal,
the input end of the power divider is connected with the narrow-band photoelectric oscillator, and the output end of the power divider is connected with the first mixer; the input end of the direct digital frequency synthesizer is connected with the power divider, and the output end of the direct digital frequency synthesizer is connected with the first phase detector; the input end of the voltage-controlled oscillator is connected with the output end of the first loop filter, and the output end of the voltage-controlled oscillator is connected with the second phase-locked loop;
the second phase locked loop includes: the input end of the second phase discriminator is connected with the second mixer, and the output end of the second phase discriminator is connected with the input end of the second loop filter;
the second phase-locked loop also comprises a sampling medium oscillator for expanding the frequency bandwidth of the signal, the input end of the sampling medium oscillator is connected with the output end of the second filter, and the signal with the expanded frequency range is output.
2. The apparatus of claim 1, further comprising a third pll comprising a third mixer, a third phase detector, a third loop filter, and a YIG oscillator, wherein the sampling medium oscillator is connected to an input of the third mixer, and transmits the frequency-spread signal of the second pll to the third mixer.
3. The apparatus of claim 2, wherein the output terminals of the frequency divider are respectively connected to the second phase detector and the third phase detector, and are used for performing phase comparison between the signal output by the narrow-band optoelectronic oscillator and the signals output by the corresponding second frequency mixer and the third frequency mixer.
4. The apparatus of claim 3, wherein the third PLL further comprises a frequency divider/multiplier, and wherein the YIG oscillator output is connected to the frequency divider/multiplier for expanding the signal frequency and outputting the expanded signal frequency.
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| CN108712213B (en) * | 2018-07-19 | 2019-10-29 | 南京航空航天大学 | Microwave three/two divided-frequency method and device based on optoelectronic oscillation loop |
| CN109067392A (en) * | 2018-07-25 | 2018-12-21 | 北京无线电计量测试研究所 | A kind of frequency combining method and device based on optical-electronic oscillator |
| CN108988857B (en) * | 2018-10-19 | 2023-07-07 | 贵州航天计量测试技术研究所 | Broadband low-phase-noise frequency synthesizer and method based on photoelectric oscillator |
| CN110034758B (en) * | 2019-03-11 | 2021-01-19 | 北京大学 | Injection locking millimeter wave frequency divider based on self-oscillation optical frequency comb and frequency dividing method thereof |
| CN113422604B (en) * | 2021-08-24 | 2021-11-16 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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