CN205141352U - Low noise reputation electric oscillator based on supplementary variable frequency technology - Google Patents
Low noise reputation electric oscillator based on supplementary variable frequency technology Download PDFInfo
- Publication number
- CN205141352U CN205141352U CN201520836176.0U CN201520836176U CN205141352U CN 205141352 U CN205141352 U CN 205141352U CN 201520836176 U CN201520836176 U CN 201520836176U CN 205141352 U CN205141352 U CN 205141352U
- Authority
- CN
- China
- Prior art keywords
- frequency conversion
- noise
- optical
- auxiliary
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 66
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000005693 optoelectronics Effects 0.000 claims description 24
- 230000010355 oscillation Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
To conventionality light electric oscillator because microwave light electric oscillator's frequency of operation is higher, the relative bandwidth receives the restriction of engineering realization, and the relative bandwidth generally is difficult to be less than the technological problem of one thousandth, the utility model provides a low noise reputation electric oscillator based on supplementary variable frequency technology, including light source, modulator, light divide ware, long term prolong the light path, in short -term prolong light path, first optical receiver, second optical receiver, electric combiner, amplify coupler, supplementary frequency conversion wave filter subassembly. Profitable technological effect: the utility model overcomes conventional light electric oscillator is because of the restriction of return circuit bandwidth broad to return circuit time delay length, has restricted the phase noise's of oscillator performance, provides a brand -new method for the phase noise who improves light electric oscillator.
Description
Technical Field
The utility model relates to a photoelectric oscillator technique, concretely relates to low noise photoelectric oscillator based on supplementary frequency conversion technique.
Background
The optoelectronic oscillator is a new oscillator different from the traditional oscillator (as shown in fig. 1), which is called as a final oscillator by scholars, and the characteristics of high frequency and low phase noise have the advantages of the optoelectronic oscillator with great technical advantages: the phase noise performance is ultra-low and is independent of the oscillation frequency; the oscillation frequency is high (the frequency range can cover 1GHz-100 GHz); wide tuning range, high speed and low vibration sensitivity (10)-12In terms of/g). The microwave photoelectric oscillator is probably an important technical revolution in the field of frequency sources, and provides a brand new technical path for future high-performance radar and electronic warfare systems.
The phase noise of the photoelectric oscillator is approximately in inverse proportion to the quadratic power of the optical fiber delay, so that the increase of the delay time of the oscillation loop is an effective means for reducing the phase noise of the microwave photoelectric oscillator, and because the phase has 360-degree periodicity, the single-loop microwave photoelectric oscillation has frequency ambiguity with the frequency period of
In the formula,is the optical feedback loop delay. In order to obtain high-frequency spectrum purity and realize suppression of other periodic frequencies, the conventional microwave photoelectric oscillator adopts a double-loop method to suppress the frequency thereof at present, the scheme still has periodicity, and an oscillation loop filter is a technical means for realizing suppression of the frequency thereof. Because the working frequency of the microwave photoelectric oscillator is high, and because the working frequency of the microwave photoelectric oscillator is high, the relative bandwidth is limited by engineering implementation, and the relative bandwidth is generally difficult to be less than one per thousand. In other words, the limitation of the loop bandwidth to the loop delay length of the conventional optoelectronic oscillator restricts the performance of the phase noise of the oscillator.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough of prior art, the utility model provides a low noise optoelectronic oscillator based on supplementary frequency conversion technique, its concrete structure as follows:
a low-noise photoelectric oscillator based on an auxiliary frequency conversion technology comprises a light source 1, a modulator 2, an optical splitter 3, a long-delay optical path 4, a short-delay optical path 5, a first optical receiver 6, a second optical receiver 7, an electric combiner 8, an amplification coupler 10 and an auxiliary frequency conversion filter component 11. Wherein,
the output of the light source 1 is connected to the input of an optical splitter 3 via a modulator 2. The optical splitter 3 splits the received optical signal into two paths, one path of the optical signal is transmitted to the first optical receiver 6 through the long-delay optical path 4, and the other path of the optical signal is transmitted to the second optical receiver 7 through the short-delay optical path 5. The output end of the first optical receiver 6 and the output end of the second optical receiver 7 are respectively connected with the input end of the electric combiner 8. The output end of the electric combiner 8 is connected with the input end of the amplifying coupler 10 through an auxiliary frequency conversion filter component 11. One output end of the amplifying coupler 10 is connected with the modulator 2, and the other output end of the amplifying coupler 10 is the output end of the ultra-narrow band low noise optoelectronic oscillator.
Further, the auxiliary frequency conversion filter component 11 includes a down converter 12, a narrow band filter 13, an up converter 14, a frequency conversion filter 15, a delay 16, and an auxiliary oscillation source 17. Wherein the output of the down-converter 12 is connected via a narrow-band filter 13 to one input of an up-converter 14. The auxiliary oscillator source 17 is connected to the down-converter 12 and the delay 16, respectively, and provides a clock signal. An output of the delay 16 is connected to another input of the up-converter 14. The output of the up-converter 14 is connected to the input of a frequency conversion filter 15. The input of the down converter 12 is the input of the auxiliary variable frequency filter assembly 11, and the output of the variable frequency filter 15 is the output of the auxiliary variable frequency filter assembly 11.
Advantageous technical effects
Constitute to conventional optoelectronic oscillator (shown in fig. 1) by light source, modulator, optical splitter, long time delay light path, short time delay light path, photoreceiver, electric combiner, wave filter, amplification coupler etc. because microwave optoelectronic oscillator's operating frequency is higher, the relative bandwidth receives the restriction that the engineering realized, and relative bandwidth generally is difficult to be less than thousandth one's technological problem, the utility model discloses replace former oscillator medium filter by supplementary frequency conversion filter subassembly, reduce operating frequency to reduce return circuit equivalent bandwidth. The auxiliary frequency conversion filter component consists of a down-conversion filter, a narrow-band filter, an up-converter, a broadband filter, a delayer and an auxiliary oscillation source.
The utility model discloses a through the operating frequency that supplementary frequency conversion reduces the oscillating circuit wave filter, make the system can realize narrower loop filter to make microwave optoelectronic oscillator can adopt longer delay circuit, finally realize the ultralow phase noise of oscillator. Because the auxiliary frequency conversion filter component introduces the auxiliary oscillation source and introduces additional phase noise, the method of frequency conversion first and frequency up-conversion is adopted to perform noise cancellation on the introduced additional phase noise.
The utility model overcomes conventional optoelectronic oscillator return circuit bandwidth has restricted the performance of the phase noise of oscillator to return circuit delay length's restriction, provides a brand-new method for improving optoelectronic oscillator's phase noise.
Drawings
Fig. 1 is a schematic diagram of a conventional optoelectronic oscillator.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic diagram of the structure of the auxiliary variable frequency filter assembly 11 in fig. 2.
Detailed Description
The structural features of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 2, the low-noise optoelectronic oscillator based on the auxiliary frequency conversion technology includes a light source 1, a modulator 2, an optical splitter 3, a long-delay optical path 4, a short-delay optical path 5, a first optical receiver 6, a second optical receiver 7, an electrical combiner 8, an amplification coupler 10, and an auxiliary frequency conversion filter component 11. Wherein,
the output of the light source 1 is connected to the input of an optical splitter 3 via a modulator 2. The optical splitter 3 splits the received optical signal into two paths, one path of the optical signal is transmitted to the first optical receiver 6 through the long-delay optical path 4, and the other path of the optical signal is transmitted to the second optical receiver 7 through the short-delay optical path 5. The output end of the first optical receiver 6 and the output end of the second optical receiver 7 are respectively connected with the input end of the electric combiner 8. The output end of the electric combiner 8 is connected with the input end of the amplifying coupler 10 through an auxiliary frequency conversion filter component 11. One output end of the amplifying coupler 10 is connected with the modulator 2, and the other output end of the amplifying coupler 10 is the output end of the ultra-narrow band low noise optoelectronic oscillator.
Furthermore, the light source 1 adopts a DFB laser with good spectral purity, the line width of the DFB laser is less than 1MHz, the relative intensity noise is less than-150 dBc/Hz, the output light power is more than 100mW, and the central wavelength is 1550 nm. The working wavelength of the modulator 2 is 1550nm, the radio frequency bandwidth is larger than 18GHz, and Vpi is smaller than 3.5V. The power distribution ratio of the optical splitter 3 is 1: 1. the long time delay optical path 4 adopts a single mode optical fiber, and the length is between 500 and 8000 m. The short-delay optical path 5 adopts a single-mode optical fiber and has a length of between 50 and 1000 m. The responsivity of the first optical receiver 6 is 0.8A/W, and the 3dB bandwidth is larger than 22 GHz. The responsivity of the second optical receiver 7 is 0.8A/W, and the 3dB bandwidth is larger than 22 GHz. The isolation of the electric combiner 8 is larger than 16dB, the phase unbalance is smaller than 5 degrees, and the insertion loss is smaller than 1 dB. The amplifier gain of the amplifying coupler 10 is larger than 40dB, the noise coefficient is smaller than 4dB, and the output 1dB compression point is larger than 15 dBm. The working frequency of the auxiliary frequency conversion filter component 11 is 10GHz, the working bandwidth is 100MHz, and the filter bandwidth is less than 200 kHz.
Furthermore, the model number of the light source 1 is EM650-193400 and 080-PM 900-FCA-NA. The modulator 2 is of type AZ-0K 5-20-PFA-SFA-LV. The optical Splitter 3 is of the type SMF1x2 Splitter. The long delay optical path 4 can implement delay by a single mode fiber. The short delay optical path 5 can implement delay by a single mode fiber. The first light receiver 6 is model DSC 30S. The second light receiver 7 is model DSC 30S. The model of the electric combiner 8 is PDM-24M-10G. The amplifying coupler 10 can be implemented by using a low noise amplifier and a power divider.
Referring to fig. 3, further, the auxiliary frequency conversion filter assembly 11 includes a down converter 12, a narrow band filter 13, an up converter 14, a frequency conversion filter 15, a delay 16, and an auxiliary oscillation source 17. Wherein,
the output of down-converter 12 is coupled via a narrow-band filter 13 to one input of an up-converter 14. The auxiliary oscillator source 17 is connected to the down-converter 12 and the delay 16, respectively, and provides a clock signal. An output of the delay 16 is connected to another input of the up-converter 14. The output of the up-converter 14 is connected to the input of a frequency conversion filter 15. The input of the down converter 12 is the input of the auxiliary variable frequency filter assembly 11, and the output of the variable frequency filter 15 is the output of the auxiliary variable frequency filter assembly 11.
Further, the delay time of the delay 16 is equal to the sum of the delay time of the loop narrow-band filter 13 and the delay time of the down-converter 14.
Furthermore, the down converter 12 has a radio frequency range of 2 to 18GHz, a medium frequency range of DC to 1GHz, and a loss variation of less than 8 dB. The center frequency of the narrow band filter 13 is 200MHz, and the 3dB bandwidth is 200 kHz. The radio frequency range of the up-converter 14 is 2-18 GHz, the intermediate frequency range is DC-1 GHz, and the variable loss is less than 8 dB. The center frequency of the frequency conversion filter 15 is 10GHz, the 3dB bandwidth is 100MHz, and the inhibition degree to 10GHz +/-200 MHz is more than 50 dB. The delay time of the delay 16 is about 5 us. The output frequency of the auxiliary oscillation source 17 is 9.8GHz, two paths of outputs are provided, the power is larger than 13dBm, and the phase noise is-110 dBc/Hz @10 kHz.
Further, down-converter 12 is of the type CXDM-D1. The narrow-band filter 13 is of the type STXFD08D200M 20-70. The up-converter 14 is of the type CXDM-D1. The model of the frequency conversion filter 15 is BP 1000-100-3C. The delay 16 is a fiber delay. The auxiliary oscillator source 17 is a conventional phase locked loop frequency synthesizer.
When the narrow-band frequency selection device is used, single-mode laser generated by a laser is divided into two paths after passing through a modulator, the two paths of electric signals are converted into two paths of electric signals by an optical receiver after passing through long and short delay fibers respectively, the two paths of electric signals are synthesized by a combiner and then sent to an auxiliary frequency conversion filter to be constructed, the frequency selection of narrow-band filtering is realized by an auxiliary frequency conversion filter component, the output of the narrow-band frequency selection device is amplified by an amplifying coupler and outputs two paths, one path is used as a radio frequency modulation signal of the modulator, and the other. When the whole loop meets the oscillation starting condition of the oscillator, the photoelectric oscillator can output a high-stability microwave signal. The photoelectric oscillator adopting the auxiliary variable frequency filtering technology can realize extremely narrow loop filtering and can solve the contradiction between the frequency ambiguity and the low phase noise of the conventional photoelectric oscillator. Along with the improvement of the output frequency of the photoelectric oscillator, the utility model discloses a more practical novel demonstration of technical advantage.
Claims (10)
1. The utility model provides a low noise optoelectronic oscillator based on supplementary frequency conversion technique which characterized in that: the optical fiber coupler comprises a light source (1), a modulator (2), an optical splitter (3), a long time delay optical path (4), a short time delay optical path (5), a first optical receiver (6), a second optical receiver (7), an electric combiner (8), an amplifying coupler (10) and an auxiliary frequency conversion filter component (11); wherein,
the output end of the light source (1) is connected with the input end of the optical splitter (3) through the modulator (2); the optical splitter (3) divides the received optical signals into two paths, one path of optical signals is transmitted to a first optical receiver (6) through a long time delay optical path (4), the other path of optical signals is transmitted to a second optical receiver (7) through a short time delay optical path (5), and the output end of the first optical receiver (6) and the output end of the second optical receiver (7) are respectively connected with the input end of an electric combiner (8); the output end of the electric combiner (8) is connected with the input end of the amplifying coupler (10) through an auxiliary variable frequency filter component (11); one output end of the amplifying coupler (10) is connected with the modulator (2), and the other output end of the amplifying coupler (10) is the output end of the ultra-narrow band low-noise optoelectronic oscillator.
2. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the light source (1) adopts a DFB laser; the line width of the light source (1) is less than 1MHz, the relative intensity noise is less than-150 dBc/Hz, the output optical power is more than 100mW, and the central wavelength is 1550 nm.
3. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the working wavelength of the modulator (2) is 1550nm, the radio frequency bandwidth is larger than 18GHz, and Vpi is smaller than 3.5V.
4. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the power distribution ratio of the optical splitter (3) is 1: 1.
5. a low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the responsivity of the first optical receiver (6) is 0.8A/W, and the 3dB bandwidth is larger than 22 GHz; the responsivity of the second optical receiver (7) is 0.8A/W, and the 3dB bandwidth is larger than 22 GHz.
6. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the isolation degree of the electric combiner (8) is larger than 16dB, the phase unbalance degree is smaller than 5 degrees, and the insertion loss is smaller than 1 dB.
7. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the amplifier gain of the amplifying coupler (10) is larger than 40dB, the noise coefficient is smaller than 4dB, and the output 1dB compression point is larger than 15 dBm.
8. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the working frequency of the auxiliary frequency conversion filter component (11) is 10GHz, the working bandwidth is 100MHz, and the filter bandwidth is less than 200 kHz.
9. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the model of the light source (1) is EM650-193400 and 080-PM 900-FCA-NA; the modulator (2) is AZ-0K 5-20-PFA-SFA-LV; the type of the optical Splitter (3) is SMF1x2 Splitter; the model of the first light receiver (6) is DSC 30S; the model of the second light receiver (7) is DSC 30S; the model of the electric combiner (8) is PDM-24M-10G.
10. A low-noise optoelectronic oscillator based on auxiliary frequency conversion technique as claimed in claim 1, wherein: the auxiliary frequency conversion filter component (11) comprises a down converter (12), a narrow-band filter (13), an up converter (14), a frequency conversion filter (15), a time delay (16) and an auxiliary oscillation source (17); wherein,
the output end of the down converter (12) is connected with one input end of the up converter (14) through a narrow-band filter (13); the auxiliary oscillation source (17) is respectively connected with the down converter (12) and the delayer (16) and provides a clock signal; the output end of the time delay device (16) is connected with the other input end of the up-converter (14); the output end of the up-converter (14) is connected with the input end of a variable frequency filter (15); the input end of the down converter (12) is the input end of the auxiliary frequency conversion filter component (11), and the output end of the frequency conversion filter (15) is the output end of the auxiliary frequency conversion filter component (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520836176.0U CN205141352U (en) | 2015-10-27 | 2015-10-27 | Low noise reputation electric oscillator based on supplementary variable frequency technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520836176.0U CN205141352U (en) | 2015-10-27 | 2015-10-27 | Low noise reputation electric oscillator based on supplementary variable frequency technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205141352U true CN205141352U (en) | 2016-04-06 |
Family
ID=55627109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520836176.0U Active CN205141352U (en) | 2015-10-27 | 2015-10-27 | Low noise reputation electric oscillator based on supplementary variable frequency technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205141352U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261914A (en) * | 2015-10-27 | 2016-01-20 | 中国电子科技集团公司第三十八研究所 | Ultra-narrowband low-noise optoelectronic oscillator |
| CN108270141A (en) * | 2018-01-18 | 2018-07-10 | 浙江大学 | A kind of master-slave mode optical-electronic oscillator and its method |
-
2015
- 2015-10-27 CN CN201520836176.0U patent/CN205141352U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261914A (en) * | 2015-10-27 | 2016-01-20 | 中国电子科技集团公司第三十八研究所 | Ultra-narrowband low-noise optoelectronic oscillator |
| CN108270141A (en) * | 2018-01-18 | 2018-07-10 | 浙江大学 | A kind of master-slave mode optical-electronic oscillator and its method |
| CN108270141B (en) * | 2018-01-18 | 2020-05-19 | 浙江大学 | Master-slave photoelectric oscillator and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10784967B2 (en) | Photonic radio-frequency receiver with mirror frequency suppression function | |
| CN108199776B (en) | Microwave photon up-conversion device and method based on photoelectric oscillator | |
| CN104022830A (en) | Device and method for generating eight frequency multiplication millimeter waves by utilizing Mach-Zehnder modulator | |
| CN113078545A (en) | Tunable dual-frequency photoelectric oscillator device based on stimulated Brillouin scattering | |
| CN110336611B (en) | Image interference rejection mixer based on optical fiber dispersion effect | |
| CN112039596A (en) | Broadband tunable multi-band microwave up-conversion system | |
| CN105261914A (en) | Ultra-narrowband low-noise optoelectronic oscillator | |
| CN205141352U (en) | Low noise reputation electric oscillator based on supplementary variable frequency technology | |
| JP4072053B2 (en) | Frequency synthesizer | |
| CN112653458B (en) | Self-injection locking photoelectric oscillator | |
| CN106656049B (en) | High-performance frequency synthesizer | |
| CN111641461B (en) | Filtering-free image rejection down-conversion method based on cascade modulator | |
| CN109361469B (en) | Millimeter wave generation system and method based on quantum dot laser | |
| KR101325247B1 (en) | Method and apparatus for generating terahertz continuous wave | |
| Berceli | A new approach for optical millimeter wave generation utilizing locking techniques | |
| CN112260761B (en) | Quadruple frequency up-conversion method based on cascaded modulator filter-free | |
| CN113315473A (en) | Terahertz frequency doubling source and working method thereof | |
| CN110463033B (en) | Enhanced linear mixer | |
| CN214228202U (en) | Frequency conversion equipment is received to X frequency channel | |
| KR100377915B1 (en) | Apparatus for mixing frequency in a RF Transceiver | |
| KR100665865B1 (en) | Multy-band transmitting and receiving apparatus | |
| CN118174794B (en) | Laser spectrum adjustable system for segmented modulation processing and implementation method thereof | |
| CN214228201U (en) | X frequency channel up-conversion equipment | |
| CN114204382B (en) | Dual-frequency microwave signal generation method and device based on photoelectric oscillator | |
| CN218482848U (en) | Frequency synthesizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |