CN115236803A - Narrow-band single-pass microwave photon filter based on Brillouin fiber laser - Google Patents
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- G—PHYSICS
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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Abstract
The invention discloses a narrow-band single-pass microwave photon filter based on a Brillouin fiber laser, and relates to the field of building engineering. The single-pass filtering of the sub-kilohertz narrow bandwidth of the microwave photon filter is realized.
Description
Technical Field
The invention relates to the field of microwave photon signal processing, in particular to a narrow-band single-pass microwave photon filter based on a Brillouin fiber laser.
Background
Microwave photonics is an active interdisciplinary that utilizes photonic technology to implement radio frequency functions in microwave systems. Microwave photonic filters are a major problem in microwave photonics, and have been receiving attention for many years due to their advantages of low loss, high line width, anti-electromagnetic interference, and the potential to overcome the limitations of electronic methods. Microwave photonic filters with narrow bandwidths can provide high frequency selectivity, which is a key technology required to implement high resolution signal identification system designs. Liujie et al, hong Kong university of science and technology, 2013, through two cascaded infinite impulse response filters, showed an ultra-narrow single-pass band microwave photonic filter with a 3dB bandwidth of 249.31 kHz; in 2017, korea of institute of instrumentation and engineering, university in southeast, et al, reported a microwave photonic filter based on birefringence effect of a semiconductor optical amplifier, wherein the 3dB bandwidth of the microwave photonic filter is 2.45MHz; wenhun et al, chinese academy of sciences in 2018, designed an ultra-high-quality tunable single-passband microwave photonic filter based on stimulated Brillouin scattering and a fiber ring resonator, and could obtain a 3dB bandwidth of 950 kHz.
Due to the existence of amplified spontaneous radiation and a certain signal-to-noise ratio requirement of a photoelectric receiver on a received signal, the bandwidth cannot be limited infinitely by using an infinite impulse response microwave photonics filter; the design of a narrow bandwidth filter can be realized through a microwave photon filter based on the birefringence effect of the semiconductor optical amplifier, but the coupling loss of the semiconductor optical amplifier and an optical fiber is too large, noise and crosstalk are large, and the filter is easily influenced by the ambient temperature, so that the stability is poor; through the microwave photon filter based on the stimulated Brillouin scattering, the narrow threshold value of the stimulated Brillouin scattering gain is limited due to the structure of the optical fiber ring resonant cavity, and the filtering range of the microwave photon filter can only reach the kilohertz level. In order to solve the above problems, there is a need for an improved narrow-band single-pass microwave photonic filter based on brillouin fiber lasers.
Disclosure of Invention
The invention aims to solve the problem that the bandwidth can not be infinitely narrowed by using the microwave photonics filter with infinite impulse response at present; the stability is poor through a microwave photon filter based on the birefringence effect of the semiconductor optical amplifier; through the microwave photon filter based on the stimulated Brillouin scattering, the filtering range can only reach kilohertz level, and the narrow-band single-pass microwave photon filter based on the Brillouin fiber laser is provided.
The invention is realized by adopting the following technical scheme:
a narrow-band single-pass microwave photon filter based on a Brillouin optical fiber laser is characterized in that the output end of a narrow-linewidth continuous wave optical fiber laser is connected with the port a of an optical splitter I, the port c of the optical splitter I is connected with the port a of a double-ring structure Brillouin optical fiber laser, the port b of the optical splitter I is connected with the port a of a phase modulator, the port c of the phase modulator is connected with the port b of the double-ring structure Brillouin optical fiber laser, the port c of the double-ring structure Brillouin optical fiber laser is connected with the port a of an optical splitter II, the port b of the optical splitter II is connected with the input port of a spectrometer, the port c of the optical splitter II is connected with the input port of a photoelectric detector, the output end of the photoelectric detector is connected with the input end of a vector network tester, and the output end of the vector network tester is connected with the port b of the phase modulator.
In implementation, the narrow-band single-pass microwave photon filter based on the Brillouin fiber laser is designed, the wavelength of the narrow-line-width continuous wave fiber laser is 1550nm, the line width is 0.1kHz, the maximum output power is 15dBm, the output end of the narrow-line-width continuous wave fiber laser is connected with an a port of a spectral coupler I, the spectral coupler I is a coupler with a spectral ratio of 90; the c port of the spectral coupler I is connected with the a port of the double-ring structure Brillouin optical fiber laser, the b port of the spectral coupler I is connected with the a port of the phase modulator, the c port of the phase modulator is connected with the b port of the double-ring structure Brillouin optical fiber laser, the c port of the double-ring structure Brillouin optical fiber laser is connected with the a port of the spectral coupler II, the spectral coupler II is a coupler with a spectral ratio of 50. The Brillouin optical fiber laser comprises a polarization controller, wherein the input end of a polarization controller I is connected with the port c of a light splitting coupler II, the output end of the polarization controller I is connected with the input end of an erbium-doped optical fiber amplifier, the output end of the erbium-doped optical fiber amplifier is connected with the port a of an optical circulator, the port b of the optical circulator is connected with the port b of a single-mode optical fiber I with the length of 100m, the port c of the optical circulator is connected with the port a of a light splitting coupler V, the port c of the light splitting coupler V is connected with the input end of a single-mode optical fiber with the length of 10m, the output end of the single-mode optical fiber II is connected with the port b of the light splitting coupler V, the light splitting coupler V is a coupler with the splitting ratio of 50, the port d of the light splitting coupler V is connected with the port a of the light splitting coupler IV, the light splitting coupler IV is a coupler with the splitting ratio of 99. When the narrow-linewidth continuous wave fiber laser 1 is used as a pumping light source and is input from an a port of an optical splitter I, a c port of the optical splitter I is a 10% output port and outputs pumping light to an a port of a double-ring-structure Brillouin fiber laser, a b port of the optical splitter I is a 90% output port and outputs optical carriers, the optical carriers enter from the a port of a phase modulator, radio-frequency signals from a vector network tester are modulated to the pumping light through the phase modulator to generate modulated light, the modulated light is input into the double-ring-structure Brillouin fiber laser through the c port of the phase modulator, the narrow-linewidth laser is generated through the double-ring-structure Brillouin fiber laser, the narrow-linewidth laser is output through an optical splitter II of 50, signals output from the b port are directly input into a spectrometer for observation, and signals output from the c port are subjected to frequency beating through a photoelectric detector and output to the vector network tester for testing. In the double-ring-structure Brillouin optical fiber laser, pump light output from a port c of an optical splitter I enters a polarization controller I for adjustment, and then is amplified to a power higher than a Brillouin scattering threshold value of a single-mode optical fiber by an erbium-doped optical fiber amplifier, wherein the input power range of the erbium-doped optical fiber amplifier is-20 to 15dBm, and the maximum output power is 37dBm; the output from the b port of the optical circulator is carried out through the a port of the optical circulator, the single-mode fiber I is injected from the b port of the single-mode fiber I, meanwhile, the modulated light output from the a port of the optical splitter III is injected into the single-mode fiber I from the a port of the single-mode fiber I, the modulated light and the pump light interact in the 100m single-mode fiber I and stimulate Brillouin scattering, the Stokes light is generated and passes through the b port of the optical circulator and is output from the c port of the optical circulator, the Stokes light is injected into a ring resonator formed by a 50-splitting-ratio optical coupler V and a 10 m-long single-mode fiber II and surrounds the resonator along the counterclockwise direction, the mixed signal shows periodic resonance, the line width of each resonance is very narrow, the Brillouin gain spectrum is compressed and becomes a unique stable narrow line width Brillouin gain spectrum after the Brillouin gain spectrum is compressed and repeatedly revolved in the resonator through the b port of the optical splitter III to form a narrow line width, and the threshold value of the optical coupler IV output from the c port 99. Single bandpass filtering is achieved by amplifying sidebands of a double-sideband modulation signal through stimulated Brillouin scattering, the line width of the stimulated Brillouin scattering is greatly compressed through the ultra-narrow resonant line width of an annular resonant cavity containing 10-meter optical fibers, single longitudinal mode output is achieved through the vernier effect of a double annular cavity, and therefore narrow-line-width single longitudinal mode laser is generated.
Compared with the prior art, the invention has the following beneficial effects: compared with the existing microwave photon filter based on stimulated Brillouin scattering, the narrow-band single-pass microwave photon filter based on the Brillouin fiber laser realizes single-band-pass filtering by amplifying the sidebands of a double-sideband modulation signal through the stimulated Brillouin scattering, greatly compresses the linewidth of the stimulated Brillouin scattering through the ultra-narrow resonant line width of the annular resonant cavity containing 10 meters of optical fibers, and realizes single-longitudinal-mode output by using the vernier effect of a double-ring cavity, thereby generating narrow-linewidth single-longitudinal-mode laser. Through the Brillouin fiber laser with the double-ring structure, the Brillouin gain spectral line width is narrowed to the sub kilohertz level, single longitudinal mode laser output is realized by using a vernier effect, further, the sub kilohertz level narrow-bandwidth single-pass microwave photon filtering is realized, the problem that the conventional microwave photon filter based on stimulated Brillouin scattering cannot break through the kilohertz level bandwidth is solved, the sub kilohertz level narrow-bandwidth single-pass filtering of the microwave photon filter is realized, the Brillouin fiber laser can be applied to the design of high-resolution signal identification systems in the fields of communication, sensing, military and the like, is suitable for wide popularization and application, has greater market competitiveness, and has great significance.
Drawings
Fig. 1 shows a schematic structural view of the present invention.
Fig. 2 shows a schematic structural view of a double-ring structured brillouin fiber laser according to the present invention.
Fig. 3 shows a frequency response diagram of the narrow bandwidth microwave photon filter based on the brillouin fiber laser according to the embodiment of the present invention, when the center frequency is 10.735 GHz.
In the figure: the optical fiber spectrometer comprises a 1-narrow linewidth continuous wave optical fiber laser, a 2A-optical splitter I, a 2B-optical splitter II, a 2C-optical splitter III, a 2D-optical splitter IV, a 2E-optical splitter V, a 3-phase modulator, a 4-double-ring structure Brillouin optical fiber laser, a 5-spectrometer, a 6-photoelectric detector, a 7-vector network tester, an 8A-polarization controller I, an 8B-polarization controller II, a 9-erbium-doped optical fiber amplifier, a 10-optical circulator, an 11A-single mode optical fiber I and an 11B-single mode optical fiber II.
Detailed Description
The following describes an embodiment of the present invention with reference to the drawings.
A narrow-band single-pass microwave photon filter based on a Brillouin optical fiber laser is disclosed, as shown in figure 1, the wavelength of a narrow-line-width continuous wave optical fiber laser 1 is 1550nm, the line width is 0.1kHz, the maximum output power is 15dBm, the output end of the narrow-line-width continuous wave optical fiber laser 1 is connected with an a port of a spectral coupler I2A, the spectral coupler I2A is a coupler with a spectral ratio of 90; a port c of the optical splitter I2A is connected with a port a of a double-ring structure Brillouin optical fiber laser 4, a port B of the optical splitter I2A is connected with a port a of a phase modulator 3, a port c of the phase modulator 3 is connected with a port B of the double-ring structure Brillouin optical fiber laser 4, a port c of the double-ring structure Brillouin optical fiber laser 4 is connected with a port a of an optical splitter II 2B, the optical splitter II 2B is a coupler with a splitting ratio of 50, a port B of the optical splitter II 2B is connected with an input port of a spectrometer 5, the wavelength range of the spectrometer 5 ranges from 600 to 1700nm, the wavelength resolution is 0.02 to 2, the wavelength linearity is 0.01 to 0.02, the measurement power range is-90 to 20dBm, the c port of the light splitting coupler II 2B is connected with the input port of the photoelectric detector 6, the line width of the photoelectric detector 6 is 50GHz, the linear response of the optical input power is 10dBm, the output end of the photoelectric detector 6 is connected with the input end of the vector network tester 7, the output end of the vector network tester 7 is connected with the B port of the phase modulator 3, the frequency range of the vector network analyzer 7 is 300kHz-20GHz, the frequency resolution is 1Hz, the medium-frequency line width is 10Hz-1.5MHz, the frequency range is 1MHz-6GHz, the power range is-85dBm-10dBm, the line width modulation wavelength range of the phase modulator 3 is 1530-1625nm, the electro-optic frequency is 25GHz, and the interpolation loss is 2.5dB.
As shown in fig. 2, the dual-ring-structure brillouin fiber laser 4 includes a polarization controller i 8A, an input end of the polarization controller i 8A is connected to a port C of a beam splitting coupler ii 2B, an output end of the polarization controller i 8A is connected to an input end of an erbium-doped fiber amplifier 9, an output end of the erbium-doped fiber amplifier 9 is connected to a port a of an optical circulator 10, a port B of the optical circulator 10 is connected to a port B of a single-mode fiber i 11A having a length of 100m, a port C of the optical circulator 10 is connected to a port a of a beam splitting coupler v 2E, a port C of the beam splitting coupler v 2E is connected to an input end of a single-mode fiber 11B having a length of 10m, an output end of the single-mode fiber ii 11B is connected to a port B of a beam splitting coupler v 2E, the beam splitting coupler v 2E is a coupler having a splitting ratio of 50: a port D of the light splitting coupler V2E is connected with a port a of a light splitting coupler IV 2D, the light splitting coupler IV 2D is a coupler with a light splitting ratio of 99.
When the narrow linewidth continuous wave fiber laser is used, the narrow linewidth continuous wave fiber laser 1 serves as a pumping light source and is input from an a port of a light splitting coupler I2A, a c port of the light splitting coupler I2A is a 10% output port, pumping light is output to an a port of a double-ring structure Brillouin fiber laser 4, a B port of the light splitting coupler I2A is a 90% output port, light carriers enter from the a port of a phase modulator 3, a radio frequency signal from a vector network tester 7 is modulated to the pumping light through the phase modulator 3 to generate modulated light, the modulated light is input into the double-ring structure Brillouin fiber laser 4 through the c port of the phase modulator 3, narrow linewidth laser is generated through the double-ring structure Brillouin fiber laser 4 and is output through a light splitting coupler II 2B of 50, a B port output signal is directly input into a spectrometer 5 to be observed, a c port output signal is subjected to beat frequency through a photoelectric detector 6, and the signal is output to the vector network tester 7 to be tested. In the double-ring-structure Brillouin optical fiber laser 4, pump light output from a port c of an optical splitter I2A enters a polarization controller I8A for adjustment, and then is amplified to a power higher than a Brillouin scattering threshold value of a single-mode optical fiber by an erbium-doped optical fiber amplifier 9, wherein the input power range of the erbium-doped optical fiber amplifier 9 is-20 to 15dBm, and the maximum output power is 37dBm; the optical fiber I11A is injected from the B port of the optical circulator 10 through the a port of the optical circulator 10, the single mode fiber I11A is injected from the B port of the single mode fiber I11A, meanwhile, the modulated light output from the a port of the optical splitter III 2C is injected into the single mode fiber I11A through the a port of the single mode fiber I11A, the modulated light and the pump light interact in the 100m single mode fiber I11A and stimulate the Brillouin scattering, stokes light is generated to pass through the B port of the optical circulator 10 and output from the C port of the optical circulator 10, an annular resonator composed of a splitter V2E with a splitting ratio of 50. Single bandpass filtering is achieved by amplifying sidebands of a double-sideband modulation signal using stimulated brillouin scattering, the linewidth of the stimulated brillouin scattering is greatly compressed by the ultra-narrow resonant linewidth of the ring resonator containing 10 meters of optical fiber, and single longitudinal mode output is achieved using the vernier effect of the double ring cavity, thereby generating narrow linewidth single longitudinal mode laser.
The adopted Brillouin fiber laser with the double-ring structure has the following working principle:
in the optical fiber, the incident laser and the acoustic wave in the optical fiber generate nonlinear interaction to generate Stokes Brillouin scattering light, and Brillouin frequency shift v generated in the 100m optical fiber B Is represented as
Wherein, v P For pumping light frequency, V A Speed of sound, c is speed of light, v in this embodiment B About 10GHz at around 1550 nm. When the power of the pump light increases, the pump light excites the fiber Brillouin scattering, the center frequency f of which pass Is composed of
The stokes brillouin scattered light circulates in a ring resonator containing 100m optical fiber and exhibits periodic resonance, so that the brillouin gain exhibits spectral periodicity. The stokes brillouin scattered light passes through a ring resonator containing a 10m optical fiber, and the brillouin gain is narrowed, i.e., narrow linewidth laser light is generated.
The 3dB linewidth of the narrow linewidth laser output by the double-ring structure Brillouin fiber laser is ^ v
Wherein is ^ v P Is the line width of the pump light, and
wherein is ^ v B The linewidth of the Brillouin gain, c the speed of light, R the total loss of all resonators, n the refractive index of the fiber, L t Is the sum of the lengths of the optical fibers in the double-ring cavity. The filterable bandwidth is related to the laser linewidth and the linewidth of the brillouin gain.
The free spectral range FSR is expressed as
In the above specific embodiment, when the center frequency of the narrow-band microwave photon filter based on the brillouin fiber laser is 10.735GHz, the 3dB bandwidth of the microwave photon filter is only 129Hz when the bandwidth is narrowest, and the maximum Q factor is
Calculated Q =8.34 × 10 7 。
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and scope of the invention should be included.
Claims (10)
1. A narrow-band single-pass microwave photon filter based on a Brillouin fiber laser is characterized in that: the optical fiber laser device comprises a narrow-linewidth continuous wave optical fiber laser device (1), wherein the output end of the narrow-linewidth continuous wave optical fiber laser device (1) is connected with an a port of an optical splitter I (2A), a c port of the optical splitter I (2A) is connected with an a port of a double-ring structure Brillouin optical fiber laser device (4), a B port of the optical splitter I (2A) is connected with an a port of a phase modulator (3), a c port of the phase modulator (3) is connected with a B port of the double-ring structure Brillouin optical fiber laser device (4), a c port of the double-ring structure Brillouin optical fiber laser device (4) is connected with an a port of an optical splitter II (2B), a B port of the optical splitter II (2B) is connected with an input port of a spectrometer (5), a c port of the optical splitter II (2B) is connected with an input port of a photoelectric detector (6), an output end of the photoelectric detector (6) is connected with an input end of a vector network tester (7), and an output end of the vector network tester (7) is connected with an output end of the phase modulator (3).
2. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser according to claim 1, characterized in that: the double-ring-structure Brillouin optical fiber laser (4) comprises a polarization controller I (8A), the input end of the polarization controller I (8A) is connected with a port C of a light splitting coupler II (2B), the output end of the polarization controller I (8A) is connected with the input end of an erbium-doped optical fiber amplifier (9), the output end of the erbium-doped optical fiber amplifier (9) is connected with a port a of an optical circulator (10), a port B of the optical circulator (10) is connected with a port B of a single-mode optical fiber I (11A), a port C of the optical circulator (10) is connected with a port a of a light splitting coupler V (2E), a port C of the light splitting coupler V (2E) is connected with the input end of a single-mode optical fiber (11B), the output end of the single-mode optical fiber II (11B) is connected with a port B of a light splitting coupler V (2E), a port D of the light splitting coupler V (2E) is connected with an input end of a single-mode optical fiber IV (2D), an output end of a phase splitter III-C (8A) is connected with a port C of a polarization coupler III-C, C (2B) is connected with a port of a polarization coupler III-C, C (2E) is connected with a port of a polarization coupler III-C, and C of a polarization coupler III-C (2D) is connected with a polarization coupler.
3. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser in claim 2, characterized in that: the optical splitting coupler I (2A) is a coupler with a splitting ratio of 90; the light splitting coupler IV (2D) is a coupler with a light splitting ratio of 99; the light splitting coupler II (2B), the light splitting coupler III (2C) and the light splitting coupler V (2E) are couplers with a light splitting ratio of 50.
4. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser as claimed in claim 2, wherein: the input power range of the erbium-doped fiber amplifier (9) is-20 to 15dBm, and the maximum output power is 37dBm.
5. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser as claimed in claim 2, wherein: the length of the single-mode optical fiber I (11A) is 100m; the length of the single-mode optical fiber II (11B) is 10m.
6. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser according to claim 1, characterized in that: the wavelength of the narrow-linewidth continuous wave optical fiber laser (1) is 1550nm, the linewidth is 0.1kHz, and the maximum output power is 15dBm.
7. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser according to claim 1, characterized in that: the modulation wavelength range of the phase modulator (3) is 1530-1625 nm, the electro-optic line width is 25GHz, and the interpolation loss is 2.5dB.
8. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser according to claim 1, characterized in that: the wavelength range of the spectrometer (5) is 600 to 1700nm, the wavelength resolution is 0.02 to 2, the wavelength linearity is 0.01 to 0.02, and the measurement power range is-90 to 20dBm.
9. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser in claim 1, characterized in that: the line width of the photoelectric detector (6) is 50GHz, and the linear response of the optical input power is 10dBm.
10. The narrow-band single-pass microwave photonic filter based on the Brillouin fiber laser in claim 1, characterized in that: the frequency range of the vector network analyzer (7) is 300kHz-20GHz, the frequency resolution is 1Hz, the intermediate frequency line width is 10Hz-1.5MHz, and the power range is-85dBm-10dBm when the frequency range is 1MHz-6GHz.
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