CN101718941B - Device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating - Google Patents
Device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating Download PDFInfo
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- CN101718941B CN101718941B CN2009102384698A CN200910238469A CN101718941B CN 101718941 B CN101718941 B CN 101718941B CN 2009102384698 A CN2009102384698 A CN 2009102384698A CN 200910238469 A CN200910238469 A CN 200910238469A CN 101718941 B CN101718941 B CN 101718941B
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Abstract
The invention disclose a device for generating variable frequency millimeter-wave based on a linear type cavity fiber bragg grating, relating to the technical field of optical fiber communication and millimeter-wave optical generation. In the device, a pumping source (1), a narrow band optical grating (2), a first active optical fiber (31), a wide band optical grating (4) and a second active optical grating (32) are sequentially connected in series; an output port of the second active optical fiber (32) is connected with a 1*N optical switch (5); N channel ports of the 1*N optical switch (5) are respectively connected with a first narrow band fiber bragg grating (61) or a second narrow band fiber bragg grating (62), and the like, or a Nth narrow band fiber bragg grating (6N); an N*1 coupler (7) couples output ends from the first narrow band fiber bragg grating (61) to the Nth narrow band fiber bragg grating (6N) into one path; and an output port of the N*1 coupler (7) is connected with an photoelectric detector (8). By adjusting the optical switch, a laser which is emitted by a linear type resonant cavity with two different resonance frequencies has differential frequencies at thephotoelectrical detector to generate frequency adjustable millimeter-wave.
Description
Technical field
The present invention relates to optical fiber communication, millimeter wave optics generation technique field, is a kind of device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating specifically.
Background technology
Millimeter wave generation problem is a core technology in the microwave photon science, it also is the underlying issue of broadband wireless ROF technology, generation problem around millimeter wave, all carry out a large amount of research and trial both at home and abroad, but because the working frequency range of millimeter wave very high (30～300GHz) own, thereby equipment had higher requirement, directly caused construction cost too high, the present millimeter wave generating method that proposes, as direct modulation direct Detection Method, the harmonic wave production method, optical heterodyne method etc., because these methods all depend on accurate expensive tuned laser and optical modulator, and, can't carry out frequency conversion and frequency hopping adjustment for generating the millimeter-wave frequency relative fixed.The research of the application of fiber grating and particularly dual wavelength and even multi-wavelength optical fiber grating laser provides possibility for low cost generates the millimeter wave problem, and fiber laser is a kind of very promising light source in the optical fiber telecommunications system.Generate scheme based on the multiple-wavelength laser of fiber grating and millimeter wave and constantly be suggested, as the device (number of patent application 200710177000.9) of single polarization dual-wavelength fiber grating laser to generate microwave, millimeter wave, utilize the device (number of patent application 200710176999.5) of line style chamber dual wavelength fibre laser to generate microwave, millimeter wave.Their common problems that exists are to carry out the adjustment of frequency conversion rate to millimeter wave.
Summary of the invention
The present invention is a kind of device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating, and the original intention of invention is to utilize cheap fiber grating, and Active Optical Fiber and a spot of passive optical communications equipment are realized the generation of millimeter-wave signal, and frequency adjustable is whole.Its ultimate principle is that two optical resonators use two sections Active Optical Fibers respectively, utilize light to open the light and select different second resonator cavitys of narrow band fiber control to have different resonance frequencies, penetrate two different wavelength of laser thereby swash, utilize photodiode to survey, realize that beat generates millimeter wave, adopt photoswitch to select different arrowband gratings in the scheme, the realization millimeter-wave frequency can be adjusted.Total system is only by a broadband grating, a plurality of arrowbands grating, and pumping source, part photoswitch and coupling mechanism are formed, and have extremely low construction cost, and the millimeter-wave frequency tunable characteristic also have very high using value.
Technical scheme of the present invention:
Based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating, this device comprises: pumping source, arrowband grating, first Active Optical Fiber, second Active Optical Fiber, broadband grating, 1 * N photoswitch, the first narrow band fiber grating, the second narrow band fiber grating ... N narrow band fiber grating, N * 1 coupling mechanism, photodetector;
Concrete connected mode is:
Pumping source output connects an end of arrowband grating, one end of one end of one end of another termination first Active Optical Fiber of arrowband grating, another termination broadband light grid of first Active Optical Fiber, another termination second Active Optical Fiber of broadband grating, another termination 1 * N photoswitch of second Active Optical Fiber;
The first passage port of one termination, 1 * N photoswitch of the first narrow band fiber grating, another termination N of the first narrow band fiber grating * 1 coupling mechanism input end;
The second channel port of one termination, 1 * N photoswitch of the second narrow band fiber grating, another termination N of the second narrow band fiber grating * 1 coupling mechanism input end;
The N access port of one termination, 1 * N photoswitch of N narrow band fiber grating, another termination N of N narrow band fiber grating * 1 coupling mechanism input end;
N * 1 coupling mechanism output port connects photodetector.
Beneficial effect of the present invention is specific as follows:
The present invention does not relate to complexity and expensive equipment, only adopt fiber grating, Active Optical Fiber, pumping source and a small amount of passive optical communications equipment make full use of linear light fibre laser principle, apply it to the microwave photon field, in order to produce millimeter-wave signal, biggest advantage of the present invention is that system architecture is simple, and is with low cost, and has the adjustable characteristic of millimeter-wave frequency.
Description of drawings
Fig. 1 is based on the device for generating variable frequency millimeter-wave synoptic diagram (N=2) of linear type cavity fiber bragg grating.
Fig. 2 adopts grating synoptic diagram (N=2) based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating.
Fig. 3 is based on the device for generating variable frequency millimeter-wave synoptic diagram (N=4) of linear type cavity fiber bragg grating.
Fig. 4 adopts grating synoptic diagram (N=4) based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating.
Fig. 5 is based on the device for generating variable frequency millimeter-wave synoptic diagram (N=8) of linear type cavity fiber bragg grating.
Fig. 6 adopts grating synoptic diagram (N=8) based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating.
Fig. 7 is based on the device for generating variable frequency millimeter-wave synoptic diagram (N=16) of linear type cavity fiber bragg grating.
Fig. 8 adopts grating synoptic diagram (N=16) based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating.
Embodiment
Be further described below in conjunction with 1 to 8 pair of device for generating variable frequency millimeter-wave of accompanying drawing based on linear type cavity fiber bragg grating.
Embodiment one
Device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating, as shown in Figure 1, this device comprises: pumping source 1, arrowband grating 2, first Active Optical Fiber 31, second Active Optical Fiber 32, broadband grating 4,1 * 2 photoswitch 5, the first narrow band fiber grating 61, the second narrow band fiber grating, 62,2 * 1 coupling mechanisms 7, photodetector 8; Concrete connected mode is:
The first passage port of one termination, 1 * 2 photoswitch 5 of the first narrow band fiber grating 61, another termination 2 * 1 coupling mechanisms 7 input ends of the first narrow band fiber grating 61;
The second channel port of one termination, 1 * 2 photoswitch 5 of the second narrow band fiber grating 62, another termination 2 * 1 coupling mechanisms 7 input ends of the second narrow band fiber grating 62;
2 * 1 coupling mechanisms, 7 output ports connect photodetector 8.
N gets 2, the first Active Optical Fibers 31 and second Active Optical Fiber 32 is all selected Er-doped fiber for use in present embodiment one.
Band optical fiber grating 4 reflection wave centre wavelength 1545.7nm bandwidth 1nm, narrow band fiber grating 2 reflection wave centre wavelength 1545.3nm bandwidth 0.1nm, the first narrow band fiber grating, 61 reflection wave centre wavelength 1545.7nm bandwidth 0.1nm, the second narrow band fiber grating, 62 reflection wave centre wavelength 1546.1nm bandwidth 0.1nm.
The reflection peak 9A of narrow band fiber grating 2 among the embodiment, the reflection peak 9B of the first narrow band fiber grating 61, the reflection peak 9C of the second narrow band fiber grating 62, as Fig. 2, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, when 1 * 2 photoswitch 5 connects the first narrow band fiber grating 61, then the band optical fiber grating 4 and the first narrow band fiber grating 61 are formed another linear resonant cavity, resonance wavelength 1545.7nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.7nm will be swashed, this two-way light obtains frequency 50GHz (corresponding to the 0.4nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 2 * 1 coupling mechanisms 7; When 1 * 2 photoswitch 5 connects the second arrowband grating 62, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, the band optical fiber grating 4 and the second narrow band fiber grating 62 are formed another linear resonant cavity, resonance wavelength 1546.1nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1546.1nm will be swashed, this two-way light obtains frequency 100GHz (corresponding to the 0.8nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 2 * 1 coupling mechanisms 7; Control 1 * 2 photoswitch guide channel is selected different narrow band fiber gratings, and the millimeter wave of generation is realized the frequency conversion rate adjustment of 50GHz and two millimeter-wave frequencies of 100GHz.
Embodiment two
Based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating, as Fig. 3.This device comprises: pumping source 1, arrowband grating 2, first Active Optical Fiber 31, second Active Optical Fiber 32, broadband grating 4,1 * 4 photoswitch 5, the first narrow band fiber grating 61, the second narrow band fiber grating 62, the 3rd narrow band fiber grating 63, the 4th narrow band fiber grating 64,4 * 1 coupling mechanisms 7, photodetector 8; Concrete connected mode is:
The first passage port of one termination, 1 * 4 photoswitch 5 of the first narrow band fiber grating 61, another termination 4 * 1 coupling mechanisms 7 input ends of the first narrow band fiber grating 61;
The second channel port of one termination, 1 * 4 photoswitch 5 of the second narrow band fiber grating 62, another termination 4 * 1 coupling mechanisms 7 input ends of the second narrow band fiber grating 62;
The third channel port of one termination, 1 * 4 photoswitch 5 of the 3rd narrow band fiber grating 63, another termination 4 * 1 coupling mechanisms 7 input ends of the 3rd narrow band fiber grating 63;
The four-way port of one termination, 1 * 4 photoswitch 5 of the 4th narrow band fiber grating 64, another termination 4 * 1 coupling mechanisms 7 input ends of the 4th narrow band fiber grating 64;
4 * 1 coupling mechanisms, 7 output ports connect photodetector 8.
N gets 4, the first Active Optical Fibers 31 and second Active Optical Fiber 32 and all selects for use and mix holmium optical fiber in present embodiment one.
Band optical fiber grating 4 reflection wave centre wavelength 1545.9nm bandwidth 1.5nm, narrow band fiber grating 2 reflection wave centre wavelength 1545.3nm bandwidth 0.1nm, the first narrow band fiber grating, 61 reflection wave centre wavelength 1545.5nm bandwidth 0.1nm, the second narrow band fiber grating, 62 reflection wave centre wavelength 1545.9nm bandwidth 0.1nm, the 3rd narrow band fiber grating 63 reflection wave centre wavelength 1546.1nm bandwidth 0.1nm, the 4th narrow band fiber grating 64 reflection wave centre wavelength 1546.5nm bandwidth 0.1nm.
The reflection peak 9A of narrow band fiber grating 2 among the embodiment, the reflection peak 9B of the first narrow band fiber grating 61, the reflection peak 9C of the second narrow band fiber grating 62, the reflection peak 9D of the 3rd narrow band fiber grating 63, the reflection peak 9E of the 4th narrow band fiber grating 64, as Fig. 4, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, when 1 * 4 photoswitch 5 connects the first narrow band fiber grating 61, then the band optical fiber grating 2 and the first narrow band fiber grating 61 are formed another linear resonant cavity, resonance wavelength 1545.5nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.5nm will be swashed, this two-way light obtains frequency 25GHz (corresponding to the 0.2nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 4 * 1 coupling mechanisms 7; When 1 * 4 photoswitch 5 connects the second arrowband grating 62, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, the band optical fiber grating 4 and the second narrow band fiber grating 62 are formed another linear resonant cavity, resonance wavelength 1545.9nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.9nm will be swashed, this two-way light obtains frequency 75GHz (corresponding to the 0.6nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 4 * 1 coupling mechanisms 7; When 1 * 4 photoswitch 5 connects the 3rd arrowband grating 63, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, band optical fiber grating 4 and the 3rd narrow band fiber grating 63 are formed another linear resonant cavity, resonance wavelength 1546.1nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1546.1nm will be swashed, this two-way light obtains frequency 100GHz (corresponding to the 0.8nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 4 * 1 coupling mechanisms 7; When 1 * 4 photoswitch 5 connects the 4th arrowband grating 64, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, band optical fiber grating 4 and the 4th narrow band fiber grating 64 are formed another linear resonant cavity, resonance wavelength 1546.5nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1546.5nm will be swashed, this two-way light obtains frequency 150GHz (corresponding to the 1.2nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 4 * 1 coupling mechanisms 7; Control 1 * 4 photoswitch guide channel is selected different narrow band fiber gratings, and the millimeter wave of generation is realized the frequency conversion rate adjustment of 25GHz, 75GHz, 100GHz and four millimeter-wave frequencies of 150GHz.
Embodiment three
Based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating, as Fig. 5.This device comprises: pumping source 1, arrowband grating 2, first Active Optical Fiber 31, second Active Optical Fiber 32, broadband grating 4,1 * 8 photoswitch 5, the first narrow band fiber grating 61, the second narrow band fiber grating 62... the 8th narrow band fiber grating, 68,8 * 1 coupling mechanisms 7, photodetector 8; Concrete connected mode is:
The first passage port of one termination, 1 * 8 photoswitch 5 of the first narrow band fiber grating 61, another termination 8 * 1 coupling mechanisms 7 input ends of the first narrow band fiber grating 61;
The second channel port of one termination, 1 * 8 photoswitch 5 of the second narrow band fiber grating 62, another termination 8 * 1 coupling mechanisms 7 input ends of the second narrow band fiber grating 62;
The 8th access port of one termination, 1 * 8 photoswitch 5 of the 8th narrow band fiber grating 68, another termination 8 * 1 coupling mechanisms 7 input ends of the 8th narrow band fiber grating 68;
8 * 1 coupling mechanisms, 7 output ports connect photodetector 8.
N gets 8, the first Active Optical Fibers 31 and second Active Optical Fiber 32 is all selected er-doped ytterbium optical fiber for use in present embodiment one.
Band optical fiber grating 4 reflection wave centre wavelength 1546.2nm bandwidth 2nm, narrow band fiber grating 2 reflection wave centre wavelength 1545.3nm bandwidth 0.1nm, the first narrow band fiber grating, 61 reflection wave centre wavelength 1545.7nm bandwidth 0.1nm, the second narrow band fiber grating, 62 reflection wave centre wavelength 1545.9nm bandwidth 0.1nm... the 8th narrow band fiber grating, 68 reflection wave centre wavelength 1547.1nm bandwidth 0.1nm.
The reflection peak 9A of narrow band fiber grating 2 among the embodiment, the reflection peak 9B of the first narrow band fiber grating 61, the reflection peak 9I of reflection peak 9C... the 8th narrow band fiber grating 68 of the second narrow band fiber grating 62, as Fig. 6, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, when 1 * 8 photoswitch 5 connects the first narrow band fiber grating 61, then the band optical fiber grating 4 and the first narrow band fiber grating 61 are formed another linear resonant cavity, resonance wavelength 1545.7nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.7nm will be swashed, this two-way light obtains frequency 50GHz (corresponding to the 0.4nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 8 * 1 coupling mechanisms 7; When 1 * 8 photoswitch 5 connects the second arrowband grating 62, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, the band optical fiber grating 4 and the second narrow band fiber grating 62 are formed another linear resonant cavity, resonance wavelength 1545.9nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.9nm will be swashed, this two-way light obtains frequency 75GHz (corresponding to the 0.6nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 8 * 1 coupling mechanisms 7; ... when 1 * 8 photoswitch 5 connects the 8th arrowband grating 68, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, band optical fiber grating 4 and the 8th narrow band fiber grating 68 are formed another linear resonant cavity, resonance wavelength 1547.1nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1547.1nm will be swashed, after this two-way light is coupled to one the tunnel via 8 * 1 coupling mechanisms 7, obtain frequency 225GHz (corresponding to the 1.8nm wavelength interval) control 1 * 8 photoswitch guide channel by photodetector 8 beats and select different narrow band fiber gratings, the millimeter wave of generation is realized 50GHz, 75GHz... and the frequency conversion rate of eight millimeter-wave frequencies of 225GHz is adjusted
Embodiment four
Based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating, as Fig. 7.This device comprises: pumping source 1, arrowband grating 2, first Active Optical Fiber 31, second Active Optical Fiber 32, broadband grating 4,1 * 16 photoswitch 5, the first narrow band fiber grating 61, the second narrow band fiber grating 62... the 16 narrow band fiber grating, 616,16 * 1 coupling mechanisms 7, photodetector 8; Concrete connected mode is:
The first passage port of one termination, 1 * 16 photoswitch 5 of the first narrow band fiber grating 61, another termination 16 * 1 coupling mechanisms 7 input ends of the first narrow band fiber grating 61;
The second channel port of one termination, 1 * 16 photoswitch 5 of the second narrow band fiber grating 62, another termination 16 * 1 coupling mechanisms 7 input ends of the second narrow band fiber grating 62;
The 16 access port of one termination, 1 * 16 photoswitch 5 of the 16 narrow band fiber grating 616, another termination 16 * 1 coupling mechanisms 7 input ends of the 16 narrow band fiber grating 616;
16 * 1 coupling mechanisms, 7 output ports connect photodetector 8.
N gets 8, the first Active Optical Fibers 31 and second Active Optical Fiber 32 is all selected Yb dosed optical fiber for use in present embodiment one.
Band optical fiber grating 4 reflection wave centre wavelength 1546.9nm bandwidth 4nm, narrow band fiber grating 2 reflection wave centre wavelength 1545.3nm bandwidth 0.1nm, the first narrow band fiber grating, 61 reflection wave centre wavelength 1545.6nm bandwidth 0.1nm, the second narrow band fiber grating, 62 reflection wave centre wavelength 1545.8nm bandwidth 0.1nm... the 16 narrow band fiber grating, 616 reflection wave centre wavelength 1548.6nm bandwidth 0.1nm.
The reflection peak 9A of narrow band fiber grating 2 among the embodiment, the reflection peak 9B of the first narrow band fiber grating 61, the reflection peak 9Q of reflection peak 9C... the 16 narrow band fiber grating 616 of the second narrow band fiber grating 62, as Fig. 8, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, when 1 * 16 photoswitch 5 connects the first narrow band fiber grating 61, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, the band optical fiber grating 4 and the first narrow band fiber grating 61 are formed another linear resonant cavity, resonance wavelength 1545.6nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.6nm will be swashed, this two-way light obtains frequency 37.5GHz (corresponding to the 0.3nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 16 * 1 coupling mechanisms 7; When 1 * 16 photoswitch 5 connects the second arrowband grating 62, then band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, the band optical fiber grating 4 and the second narrow band fiber grating 62 are formed another linear resonant cavity, resonance wavelength 1545.8nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1545.8nm will be swashed, this two-way light obtains frequency 62.5GHz (corresponding to the 0.5nm wavelength interval) by photodetector 8 beats after being coupled to one the tunnel via 16 * 1 coupling mechanisms 7; ... when 1 * 16 photoswitch 5 connects the 16 arrowband grating 616, band optical fiber grating 4 and narrow band fiber grating 2 are formed the linear resonant cavity that a resonance wavelength is fixed as 1545.3nm, band optical fiber grating 4 and the 16 narrow band fiber grating 616 are formed another linear resonant cavity, resonance wavelength 1548.6nm, such two linear resonant cavities all are operated on the different resonance wavelength, the laser that penetrates wavelength 1545.3nm and 1548.6nm will be swashed, after this two-way light is coupled to one the tunnel via 16 * 1 coupling mechanisms 7, obtain frequency 412.5GHz (corresponding to the 3.3nm wavelength interval) control 1 * 16 photoswitch guide channel by photodetector 8 beats and select different narrow band fiber gratings, the millimeter wave of generation is realized 37.5GHz, 62.5GHz... and the frequency conversion rate of 16 millimeter-wave frequencies of 412.5GHz is adjusted.
Claims (3)
1. based on the device for generating variable frequency millimeter-wave of linear type cavity fiber bragg grating, it is characterized in that: this device comprises: pumping source (1), narrow band fiber grating (2), first Active Optical Fiber (31), second Active Optical Fiber (32), band optical fiber grating (4), 1 * N photoswitch (5), the first narrow band fiber grating (61), the second narrow band fiber grating (62) ... N narrow band fiber grating (6N), N * 1 coupling mechanism (7), photodetector (8);
Concrete connected mode is:
Pumping source (1) output connects an end of narrow band fiber grating (2), one end of one end of one end of another termination first Active Optical Fiber (31) of narrow band fiber grating (2), another termination band optical fiber grating (4) of first Active Optical Fiber (31), another termination second Active Optical Fiber (32) of band optical fiber grating (4), another termination 1 * N photoswitch (5) of second Active Optical Fiber (32);
The first passage port of one termination, 1 * N photoswitch (5) of the first narrow band fiber grating (61), another termination N of the first narrow band fiber grating (61) * 1 coupling mechanism (7) input end;
The second channel port of one termination, 1 * N photoswitch (5) of the second narrow band fiber grating (62), another termination N of the second narrow band fiber grating (62) * 1 coupling mechanism (7) input end;
...
The N access port of one termination, 1 * N photoswitch (5) of N narrow band fiber grating (6N), another termination N of N narrow band fiber grating (6N) * 1 coupling mechanism (7) input end;
N * 1 coupling mechanism (7) output port connects photodetector (8).
2. the device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating according to claim 1 is characterized in that:
The narrow band fiber grating (2) and the first narrow band fiber grating (61), the second narrow band fiber grating (62) ... the reflection wavelength of N narrow band fiber grating (6N) does not overlap mutually;
Narrow band fiber grating (2), the first narrow band fiber grating (61), the second narrow band fiber grating (62) ... the reflection wavelength of N narrow band fiber grating (6N) is all in the reflection bandwidth of band optical fiber grating (4).
3. the device for generating variable frequency millimeter-wave based on linear type cavity fiber bragg grating according to claim 1 and 2, it is characterized in that: during the first passage port of a termination 1 * N photoswitch (5) of the first narrow band fiber grating (61), narrow band fiber grating (2) forms an independently line style resonator cavity with band optical fiber grating (4); The first narrow band fiber grating (61) forms an independently line style resonator cavity with band optical fiber grating (4); Produce the two-way different wavelength of laser, locate difference frequency, produce millimeter wave at photodetector (8);
During the second channel port of one termination, 1 * N photoswitch (5) of the second narrow band fiber grating (62), narrow band fiber grating (2) forms an independently line style resonator cavity with band optical fiber grating (4); The second narrow band fiber grating (62) forms an independently line style resonator cavity with band optical fiber grating (4); Produce the two-way different wavelength of laser, locate difference frequency, produce millimeter wave at photodetector (8);
...
During the N access port of one termination, 1 * N photoswitch (5) of N narrow band fiber grating (6N), narrow band fiber grating (2) forms an independently line style resonator cavity with band optical fiber grating (4); N narrow band fiber grating (6N) forms an independently line style resonator cavity with band optical fiber grating (4); Produce the two-way different wavelength of laser, locate difference frequency, produce millimeter wave at photodetector (8); N 〉=2, N≤16;
Control 1 * N photoswitch (5) guide channel selects first or second ... or N narrow band fiber grating, the millimeter wave that produces is realized the adjustment of frequency conversion rate.
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