CN101393304A - Microwave photon filter based on chirp optical fiber grating and doping active optical fiber - Google Patents
Microwave photon filter based on chirp optical fiber grating and doping active optical fiber Download PDFInfo
- Publication number
- CN101393304A CN101393304A CNA2008102262959A CN200810226295A CN101393304A CN 101393304 A CN101393304 A CN 101393304A CN A2008102262959 A CNA2008102262959 A CN A2008102262959A CN 200810226295 A CN200810226295 A CN 200810226295A CN 101393304 A CN101393304 A CN 101393304A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- fiber
- active optical
- input end
- port
- 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.)
- Pending
Links
Images
Landscapes
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses an active optical fiber-doped chirped microwave photonic filter. The connection of components of the active optical fiber-doped chirped microwave photonic filter is as follows: an output end of a laser (10) and an output end of an audio-frequency signal generator (20) are connected with two input ends of a modulator (30) respectively; an output end of the modulator is connected with one input end of an optical fiber coupler (40) the other input end of which is connected with a first port of an optical fiber circulator (50); a second port of the optical fiber circulator is connected with one end which is doped with active optical fibers, and the other end which is doped with the active optical fibers is connected with an output end of a wavelength division multiplexer (70); a third port of the optical fiber circulator is connected in series with N fiber gratings; and one input end of the wavelength division multiplexer is connected with a pumping source (80), and the other input end of the wavelength division multiplexer is connected with one output end of the optical fiber coupler the other output end of which is connected with an input end of a photoelectric detector (100). The filter has high quality factor and low cost, and is used in the fields of optical fiber microwave communication, microwave photons, satellite communication, radars, etc.
Description
Technical field
The present invention relates to a kind of microwave photon filter, be applicable to fields such as optical fiber microwave communication (RoF:Radioon/over Fiber), microwave photon, satellite communication and radar.
Background technology
The communication technology and the IT technology of making rapid progress promote constantly development of society.After coming into operation, the large capacity digital microwave transmission system soon, just replaced by high capacity long-distance optical fiber communication system.In recent years, be accompanied by the appearance of electronic technology high speed, high frequencyization, millimeter wave band welcomes the recovery phase again, and in electromagnetic wave bands, advanced Fibre Optical Communication Technology is just being brought into play and acted on.Concerning the mankind, the maximum assets that 21 century is left people for are electromagnetic wave bands that electric wave and light merge.In other words, the key of modern communications is " light and wireless ".
The application of microwave in satellite communication and land mobile communication system is more prevalent, and microwave filter occupies crucial status in communication system, is a kind of radio-frequency devices of key.
The development trend of microwave current wave filter mainly comprises step impedance resonance filter, has to suppress harmonic performance preferably and processing dimension is little; The microwave active filter can pass through desired passband signal without distortion, suppresses unwanted stopband signal as wide as possible simultaneously, is the important means that realizes this frequency range low-loss and high performance microwave integrated filter, has very big market potential; Film acoustics bulk wave resonance technique occupies absolute advantage aspect miniaturization, can realize that volume is less than present product based on ceramic product 10%; In addition, microwave, millimetre-wave attenuator, system and equipment such as radar, measurement instrument require Microwave Devices ﹠ Circuits to reach level higher, that upgrade, and the development that appears as microwave technology of superconductor brings new expulsive force.Along with the develop rapidly of mobile communication, electronic countermeasure and airmanship, the demand of new microwave device and the improvement of existing device performance are had higher requirement.
The microwave photon technology is learned microwave and is in the same place with optical fusion, becomes a brand-new technology field, is commonly referred to Microwave Photonics (being called for short MWP).Opened a field mystery, full of hope in the development that is integrated in telecommunication of photon technology and microwave, millimeter wave.Optical tech merges mutually with electric wave technology, utilize low-loss that optical fiber has, high capacity, non-inductive, in light weight, be easy to characteristics such as carrying, in traditional microwave technology, introduce optical tech, the basic network that can form information society reaches communication system multifunction and High Level that the continuous development of indivedual technology also can't realize.Last decade, microwave photon are learned and to have been caused the attention of countries in the world, now special microwave photon international conference every year in the North America, Europe, the Asian-Pacific area holds in turn.
In fact, owing to using value potential in the microwave/millimeter wave fibre system, the microwave signal treatment technology on the light territory has caused numerous researchers' interest, becomes international research focus in recent years.Compared with traditional electronic microwave wave filter, advantage such as microwave photon filter has that electromagnetic compatibility is good, volume is little, in light weight and bandwidth of operation broad.Fiber grating has good wavelength selectivity energy and filtering characteristic, can make up microwave photon filter in the mode of dexterity, therefore many microwave photon filter constructions based on fiber grating have been proposed in recent years, as uneven Mach-Zehnder interferometer structure, structure based on wideband light source and optical fiber optical grating array, adopt the structure of superstructure grating and wideband light source, adopt the right structure of fiber grating, based on the structure of tunable laser and fiber grating and the adjustable filter structure of appliance computer control differential delay line etc., but the subject matter that exists is that cost is higher, complex structure, tunability is relatively poor.
Publish in January, 2006 at periodical " photoelectron laser ", in the 17th volume 1 interim " based on the tunable microwave photon filter of fiber optic loop ", a kind of microwave photon filter construction has been proposed, an input end of the output termination modulator of laser instrument, another input end of the output termination modulator of radio-frequency signal generator; An input end of the output termination fiber coupler of modulator, another input end of fiber coupler links to each other with first port of optical fiber circulator, second port of optical fiber circulator links to each other with an output terminal of fiber coupler, and optical fiber circulator the 3rd port connects the fiber grating of N series connection; Another output terminal of fiber coupler is connected with the input end of photoelectric detector; The microwave photon filter of this structure makes full use of the wavelength selectivity of fiber grating, and its free sound interval can realize continuous tuning by the wavelength that changes the input light carrier, has precipitous attenuation outside a channel, amplitude versus frequency characte and phase propetry in the smooth band; But the defective of the wave filter maximum of this structure is that quality factor are lower, makes performance of filter poor.
In a word, microwave filter occupies crucial status in communication system, is a kind of radio-frequency devices of key.
Summary of the invention
Technical matters to be solved by this invention is to improve the quality factor of microwave photon filter, improves performance of filter, and a kind of microwave photon filter based on chirped fiber grating and Active Optical Fiber is provided.
Technical scheme of the present invention:
Microwave photon filter based on chirped fiber grating and doping Active Optical Fiber, constitute being connected between the device of this wave filter: an input end of the output termination modulator of laser instrument, another input end of the output termination modulator of radio-frequency signal generator; An input end of the output termination fiber coupler of modulator, first port of another input termination optical fiber circulator of fiber coupler, second port of optical fiber circulator links to each other with an end of doping Active Optical Fiber, N chirped fiber grating of the 3rd port series connection of fiber optical circulator, the other end of doping Active Optical Fiber links to each other with the output terminal of wavelength division multiplexer, an input termination pumping source of wavelength division multiplexer, another input end of wavelength division multiplexer links to each other with an output terminal of fiber coupler, and another output terminal of fiber coupler is connected with the input end of photoelectric detector.
The doping Active Optical Fiber is er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped Active Optical Fiber.
The fiber coupler splitting ratio is for arbitrarily.
The pump mode of pumping source is pumping in the same way, backward pump or two directional pump.
The length of doping Active Optical Fiber 〉=0.5 meter.
Beneficial effect of the present invention is specific as follows:
Microwave photon filter based on chirped fiber grating and doping Active Optical Fiber of the present invention, make full use of the wavelength selectivity of chirped fiber grating, in fiber optical circulator and fiber coupler, add the doping Active Optical Fiber, the quality factor of microwave photon filter have been increased substantially, improved the performance of microwave photon filter, its free sound interval can realize continuous tuning by the wavelength that changes the input light carrier, this high performance microwave photon filter and low-noise preamplifier, small-sized refrigerator and electronic control system can be formed filter system and replace having now the conventional filter system of being made up of the plain metal wave filter in the mobile communication base station, can improve speech quality greatly, increase the conversation capacity, enlarge the area coverage of base station, strengthen the antijamming capability of base station, reduce the mobile phone emissive power, have tempting development prospect.
Description of drawings
Fig. 1 is the structural representation of N for the microwave photon filter chirped fiber grating number based on chirped fiber grating and doping Active Optical Fiber.
Fig. 2 is 2 structural representation for the microwave photon filter chirped fiber grating number based on chirped fiber grating and doping Active Optical Fiber.
Fig. 3 is 6 structural representation for the microwave photon filter chirped fiber grating number based on chirped fiber grating and doping Active Optical Fiber.
Fig. 4 is 10 structural representation for the microwave photon filter chirped fiber grating number based on chirped fiber grating and doping Active Optical Fiber.
Embodiment
Below in conjunction with accompanying drawing the microwave photon filter based on chirped fiber grating and doping Active Optical Fiber is further described.
Embodiment one
As Fig. 2, based on the microwave photon filter of chirped fiber grating and doping Active Optical Fiber, the connection between the device of its formation:
Selecting the number N of chirped fiber grating is 2.
Selecting doping Active Optical Fiber 60 is Er-doped fiber, and length is 1 meter.
Select the pump mode of pump light 80 to be pumping in the same way.
Selecting the splitting ratio of fiber coupler 40 is 50:50
An input end of the output termination modulator 30 of laser instrument 10, another input end of the output termination modulator 30 of radio-frequency signal generator 20; The output termination splitting ratio of modulator 30 is an input end of the fiber coupler 40 of 50:50, first port one of another input termination optical fiber circulator 50 of fiber coupler 40, second port 2 and the length of optical fiber circulator 50 is that an end of 1 meter Er-doped fiber 60 links to each other, 2 chirped fiber gratings 91 of the 3rd port 3 series connection of optical fiber circulator 50,92, the other end of Er-doped fiber 60 links to each other with the output terminal of wavelength division multiplexer 70, an input termination pumping source 80 of wavelength division multiplexer 70, pumping source 80 carries out pumping in the same way by 70 pairs of Er-doped fibers of wavelength division multiplexer 60 and produces gain, another input end of wavelength division multiplexer 70 links to each other with an output terminal of fiber coupler 40, and another output terminal of fiber coupler 40 is connected with the input end of photoelectric detector 100.
The light signal that the radiofrequency signal of radio-frequency signal generator 20 emissions and laser instrument 10 send is modulated in modulator 30, the light signal of modulator 30 outputs is afterwards injected in the fiber coupler 40, pump light 80 pumping in the same way drives the 60 generation gains of 1 meter long Er-doped fiber, because chirped fiber grating 91,92 have the reflection potential to different wave length, different modulated light according to wavelength is cut into and fiber grating 91,92 the same number of 2 light beams, the width of light beam is by chirped fiber grating 91,92 reflection bandwidth decision, and every bundle cutting light is because the difference of reflection spot, arrive fiber optical circulator 50 the 3rd port 3 and arranged between adjacent a mistiming, so just formed the delay inequality of different light beams, by changing laser instrument 10 input light wavelengths, light signal is different through the path of the chirped fiber grating of the 3rd port 3 series connection of fiber optical circulator 50, thereby the also change accordingly of the free sound interval of microwave photon filter, thereby realizes active high quality factor filtering and tunability.
Embodiment two
As Fig. 3, based on the microwave photon filter of chirped fiber grating and doping Active Optical Fiber, the connection between the device of its formation:
Selecting the number N of chirped fiber grating is 6.
Selecting doping Active Optical Fiber 60 is Yb dosed optical fiber, and length is 4 meters.
Selecting the pump mode of pump light 80 is backward pump.
Selecting the splitting ratio of fiber coupler 40 is 30:70
An input end of the output termination modulator 30 of laser instrument 10, another input end of the output termination modulator 30 of radio-frequency signal generator 20; The output termination splitting ratio of modulator 30 is an input end of the fiber coupler 40 of 30:70, first port one of another input termination optical fiber circulator 50 of fiber coupler 40, second port 2 of optical fiber circulator 50 links to each other with the output terminal of wavelength division multiplexer 70,6 chirped fiber gratings 91 of the 3rd port 3 series connection of optical fiber circulator 50,92,96, an input end of wavelength division multiplexer 70 links to each other with an end of 4 meters long Yb dosed optical fibers 60, another input termination pumping source 80 of wavelength division multiplexer 70, pumping source 80 carries out backward pumping by 70 pairs of Yb dosed optical fibers of wavelength division multiplexer 60 and produces gain, the other end of Yb dosed optical fiber 60 links to each other with an output terminal of fiber coupler 40, and another output terminal of fiber coupler 40 is connected with the input end of photoelectric detector 100.
Embodiment three
As Fig. 4, based on the microwave photon filter of chirped fiber grating and doping Active Optical Fiber, the connection between the device of its formation:
Selecting the number N of chirped fiber grating is 10.
Selecting doping Active Optical Fiber 60 is neodymium-doped fiber, and length is 10 meters.
Selecting the pump mode of pump light 80 is two directional pump.
Selecting the splitting ratio of fiber coupler 40 is 50:50
An input end of the output termination modulator 30 of laser instrument 10, another input end of the output termination modulator 30 of radio-frequency signal generator 20; The output termination splitting ratio of modulator 30 is an input end of the fiber coupler 40 of 50:50, first port one of another input termination optical fiber circulator 50 of fiber coupler 40, second port 2 of optical fiber circulator 50 links to each other with the output terminal of wavelength division multiplexer 70,10 chirped fiber gratings 91 of the 3rd port 3 series connection of optical fiber circulator 50,92,910, an input end of wavelength division multiplexer 70 links to each other with an end of 10 meters long neodymium-doped fibers 60, another input termination pumping source 80 of wavelength division multiplexer 70, the other end of neodymium-doped fiber 60 links to each other with the output terminal of wavelength division multiplexer 71, an input termination pumping source 81 of wavelength division multiplexer 71, another input end of wavelength division multiplexer 71 links to each other with an output terminal of fiber coupler 40, pumping source 80 is by wavelength division multiplexer 70, pumping source 81 carries out two directional pump to neodymium-doped fiber 60 simultaneously by wavelength division multiplexer 71 and produces gain, and another output terminal of fiber coupler 40 is connected with the input end of photoelectric detector 100.
Embodiment four
As Fig. 1, based on the microwave photon filter of chirped fiber grating and doping Active Optical Fiber, the connection between the device of its formation:
An input end of the output termination modulator 30 of laser instrument 10, another input end of the output termination modulator 30 of radio-frequency signal generator 20; An input end of the output termination fiber coupler 40 of modulator 30, first port one of another input termination optical fiber circulator 50 of fiber coupler 40, second port 2 of optical fiber circulator 50 links to each other with an end of doping Active Optical Fiber 60, N chirped fiber grating 91 of the 3rd port 3 series connection of optical fiber circulator 50,92,9N, the other end of doping Active Optical Fiber 60 links to each other with the output terminal of wavelength division multiplexer 70, an input termination pumping source 80 of wavelength division multiplexer 70, pumping source 80 carries out pumping in the same way by 70 pairs of doping Active Optical Fibers of wavelength division multiplexer 60 and produces gain, another input end of wavelength division multiplexer 70 links to each other with an output terminal of fiber coupler 40, and another output terminal of fiber coupler 40 is connected with the input end of photoelectric detector 100.
Doping Active Optical Fiber 60 for er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped Active Optical Fiber.
The pump mode of pumping source 80 is pumping in the same way, backward pump or two directional pump.
The length of doping Active Optical Fiber 60 〉=0.5 meter.
Embodiment two, embodiment three, identical among the realization principle idea of the microwave photon filter among the embodiment four and the embodiment one, different number of beams differences that make cutting of the quantity of chirped fiber grating just, and doping Active Optical Fiber kind and the pump mode selected are different.The number of chirped fiber grating can be accomplished 80 at present, but along with fiber grating manufacture craft and used optical device constantly develop, the number of chirped fiber grating can increase gradually, thereby makes the tuning range of microwave photon filter increase gradually.
Device used herein is chosen by market.
Claims (5)
1. based on the microwave photon filter of chirped fiber grating and doping Active Optical Fiber, constitute being connected between the device of this wave filter: an input end of the output termination modulator (30) of laser instrument (10), another input end of the output termination modulator (30) of radio-frequency signal generator (20); An input end of the output termination fiber coupler (40) of modulator (30), another input end of fiber coupler (40) links to each other with first port (1) of optical fiber circulator (50), second port (2) of optical fiber circulator (50) links to each other with an output terminal of fiber coupler (40), and optical fiber circulator (50) the 3rd port (3) connects the fiber grating (91～9N) of N series connection; Another output terminal of fiber coupler (40) is connected with the input end of photoelectric detector (100);
It is characterized in that second port (2) of optical fiber circulator (50) links to each other with an end of doping Active Optical Fiber (60), the other end of doping Active Optical Fiber (60) links to each other with wavelength division multiplexer (70) output terminal; (70) input ends of wavelength division multiplexer link to each other with pumping source (80), and another input end of wavelength division multiplexer (70) links to each other with another output terminal of fiber coupler (40).
2. the microwave photon filter based on chirped fiber grating and Active Optical Fiber according to claim 1 is characterized in that, doping Active Optical Fiber (60) is er-doped, mix ytterbium, mix holmium, thorium is mixed, mixed to the ytterbium erbium altogether, mix praseodymium or neodymium-doped Active Optical Fiber.
3. the microwave photon filter based on chirped fiber grating and Active Optical Fiber according to claim 1 is characterized in that, used fiber coupler (40) splitting ratio is for arbitrarily.
4. the microwave photon filter based on chirped fiber grating and Active Optical Fiber according to claim 4 is characterized in that, the pump mode of used pumping source (80) is pumping in the same way, backward pump or two directional pump.
5. the microwave photon filter based on chirped fiber grating and Active Optical Fiber according to claim 1 is characterized in that, length 〉=0.5 of doping Active Optical Fiber (60) meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262959A CN101393304A (en) | 2008-11-12 | 2008-11-12 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262959A CN101393304A (en) | 2008-11-12 | 2008-11-12 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101393304A true CN101393304A (en) | 2009-03-25 |
Family
ID=40493669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102262959A Pending CN101393304A (en) | 2008-11-12 | 2008-11-12 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101393304A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852896A (en) * | 2010-03-25 | 2010-10-06 | 长春理工大学 | Fiber comb filter with chromatic dispersion compensation function |
| CN101968577A (en) * | 2010-09-17 | 2011-02-09 | 四川马尔斯科技有限责任公司 | Planar integrated photonics based optical tunable filter and tuning method thereof |
| CN102081198A (en) * | 2011-03-07 | 2011-06-01 | 北京交通大学 | Piezoelectric adjustable photon microwave filter based on conical fiber grating |
| CN102520487A (en) * | 2011-12-15 | 2012-06-27 | 北京交通大学 | Flat microwave photonic filter based on Mach-Zehnder modulator and frequency converter |
| CN106788865A (en) * | 2016-12-12 | 2017-05-31 | 南京理工大学 | The true time delay experimental provision of wavelength-division multiplex and method based on fiber reflector and LCFBG |
| CN106988735A (en) * | 2017-05-16 | 2017-07-28 | 中国石油集团渤海钻探工程有限公司 | High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system |
| CN110208967A (en) * | 2019-04-26 | 2019-09-06 | 华东师范大学 | The tunable microwave photon filter device of chirp grating is embedded based on optical fiber MZI |
-
2008
- 2008-11-12 CN CNA2008102262959A patent/CN101393304A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852896A (en) * | 2010-03-25 | 2010-10-06 | 长春理工大学 | Fiber comb filter with chromatic dispersion compensation function |
| CN101968577A (en) * | 2010-09-17 | 2011-02-09 | 四川马尔斯科技有限责任公司 | Planar integrated photonics based optical tunable filter and tuning method thereof |
| CN102081198A (en) * | 2011-03-07 | 2011-06-01 | 北京交通大学 | Piezoelectric adjustable photon microwave filter based on conical fiber grating |
| CN102520487A (en) * | 2011-12-15 | 2012-06-27 | 北京交通大学 | Flat microwave photonic filter based on Mach-Zehnder modulator and frequency converter |
| CN106788865A (en) * | 2016-12-12 | 2017-05-31 | 南京理工大学 | The true time delay experimental provision of wavelength-division multiplex and method based on fiber reflector and LCFBG |
| CN106788865B (en) * | 2016-12-12 | 2018-06-12 | 南京理工大学 | Wavelength-division multiplex based on fiber reflector and LCFBG is really delayed experimental provision and method |
| CN106988735A (en) * | 2017-05-16 | 2017-07-28 | 中国石油集团渤海钻探工程有限公司 | High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system |
| CN110208967A (en) * | 2019-04-26 | 2019-09-06 | 华东师范大学 | The tunable microwave photon filter device of chirp grating is embedded based on optical fiber MZI |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101393304A (en) | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber | |
| CN107332618B (en) | A kind of access communications system of 5G-RoF center base station control wave beam forming | |
| CN100536261C (en) | Device for single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave | |
| Minasian et al. | Photonics-based interference mitigation filters | |
| CN102075471B (en) | Gaussian filter minimum shift frequency keying-based optical wireless fusion system and method | |
| CN201213262Y (en) | Tunable microwave/millimeter wave generator for optical fiber | |
| CN103018838B (en) | Wide-band tuning high q-factor single-pass band microwave photon filter | |
| CN104409956A (en) | Multiple-microwave local oscillator source generation device based on injection locking quantum dot mode-locked laser | |
| CN101321018B (en) | Microwave/millimeter wave generator based on array wave-guide optical grating and optical fiber optical grating | |
| CN102520487A (en) | Flat microwave photonic filter based on Mach-Zehnder modulator and frequency converter | |
| CN100524977C (en) | Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser | |
| CN101562482B (en) | Fiber wireless communication system and method for generating downlink multi-service millimeter wave | |
| Shen et al. | 16-Tb/s real-time demonstration of 100-km MDM transmission using commercial 200G OTN system | |
| CN201234258Y (en) | Dual path microwave/millimeter wave generator for Sagnac optical fiber loop | |
| CN101436904A (en) | Microwave photon filter construction capable of implementing negative coefficient | |
| CN103733547A (en) | Optical line terminal, optical network unit, optical network system and signal processing method | |
| CN202334532U (en) | Microwave/millimeter-wave signal generator based on ring cavity grating array | |
| CN102324983B (en) | Michelson interferometer-based optical domain multi-wavelength signal generation system | |
| CN104898304A (en) | Photonic microwave filter introducing infinite impulse response | |
| CN101222102B (en) | Device for generating microwave and millimeter wave of linear cavity polarization-preserving optical fiber laser | |
| Kazancılı et al. | Amplifier analysis of radio over fiber communication systems | |
| Tang et al. | Ultra‐wideband bandpass filter using hybrid microstrip‐defected‐ground structure | |
| CN201252548Y (en) | Microwave/millimeter wave generator based on an optical fiber coupler and fiber grating | |
| Imai et al. | Wide-band millimeter-wave/optical-network applications in Japan | |
| CN110221455B (en) | Microwave photon band-pass filter chip based on silicon waveguide stimulated Brillouin scattering effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090325 |