CN100430815C - Adjustable light pulse time-delay device with wide bandwidth and multiple gains based on stimulated brillouin scatter - Google Patents
Adjustable light pulse time-delay device with wide bandwidth and multiple gains based on stimulated brillouin scatter Download PDFInfo
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- CN100430815C CN100430815C CNB2006101510134A CN200610151013A CN100430815C CN 100430815 C CN100430815 C CN 100430815C CN B2006101510134 A CNB2006101510134 A CN B2006101510134A CN 200610151013 A CN200610151013 A CN 200610151013A CN 100430815 C CN100430815 C CN 100430815C
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Abstract
A pulse delay device of adjustable light based on multigrain spectral band width excited by Brillouin scattering is prepared as connecting laser source to pumping light source being connected to adjustable attenuator, connecting said attenuator to the second optical fiber circulator (TSOFC) being connected to the second single-mode optical fiber, connecting laser source to detection pulse light source being connected to optical fiber isolator, connecting said isolator to the third polarized controller being connected to the second single-mode optical fiber, and using the third port of TSOFC as output end.
Description
Technical field
The present invention relates to the light pulse time-delay device in a kind of optical fiber.
Background technology
At present, utilize the optical pulse delay unit of the slower rays principle development of the transmission of light pulse in medium to cause people's extensive interest.Its potential application comprises quantum computer, all optical communication, fields such as data processing.And realize that in optical fiber the slower rays meaning is particularly important, because it and present optical communication system are complementary, so practicality is stronger.Recently, utilize stimulated Brillouin scattering to realize that the slower rays transmission of light pulse in optical fiber obtained people's extensive concern.
But the brillouin gain bandwidth in the optical fiber is narrower, generally has only 30～50MHz, thereby the pulsed light of paired pulses bandwidth narrower (less than 15ns) can make pulsed light that significant distortion takes place when amplifying, and when the bandwidth of slower rays system is wide greater than the incident pulse light belt, though the relative time delay of pulsed light distortion reducing slower rays also reduces.
Summary of the invention
The present invention is for the bandwidth that obtains bigger slower rays system and bigger relative time delay, and provides a kind of based on the stimulated Brillouin scattering adjustable light pulse time-delay device with wide bandwidth and multiple gains.
The present invention is based on the stimulated Brillouin scattering adjustable light pulse time-delay device with wide bandwidth and multiple gains, it comprises lasing light emitter, pump light source, direct impulse light source, fibre optic isolater, the 3rd Polarization Controller, adjustable attenuator, second fiber optical circulator, second single-mode fiber; Lasing light emitter first output terminal is connected the input end of pump light source, the output terminal of pump light source connects the input end of adjustable attenuator, the output terminal of adjustable attenuator connects first port of second fiber optical circulator, and second port of second fiber optical circulator connects an end of second single-mode fiber; Lasing light emitter second output terminal is connected the input end of direct impulse light source, the output terminal of direct impulse light source connects the input end of fibre optic isolater, the output terminal of fibre optic isolater connects the input end of the 3rd Polarization Controller, the output terminal of the 3rd Polarization Controller connects the other end of second single-mode fiber, and the 3rd port of second fiber optical circulator is an output terminal; Pump light source is made up of fibre optic polarizer, phase-modulator, modulating signal source, Erbium-Doped Fiber Amplifier (EDFA); First output port of lasing light emitter connects the input port of fibre optic polarizer, the output port of fibre optic polarizer connects the input port of phase-modulator, the output terminal of modulating signal source connects the electrical input of phase-modulator, the output terminal of phase-modulator connects the input end of Erbium-Doped Fiber Amplifier (EDFA), and the output terminal of Erbium-Doped Fiber Amplifier (EDFA) is the output terminal of pump light source; Except being connected to circuit is connected of modulating signal source and phase-modulator, remaining connection is optical fiber and connects in the connection of above-mentioned each device.
Stimulated Brillouin scattering generally is described to the interaction process of two reverse transfer light: the pump light of a beam intensity and a branch of weak Stokes light.If they satisfy phase-matching condition, will produce a sound wave, constantly pump light is scattered on the Stokes light, thereby being reached, this process is excited.According to the Kramers-Kronig relation, Brillouin's amplification process can produce change of refractive, and the acute variation of refractive index can cause the increase of group index, so group velocity is slack-off.Gain bandwidth (GB) was 30～50MHz when pump light was 1550nm in single-mode fiber.Be the raising gain bandwidth (GB), thereby can delay time that we carry out the multiline pump light that phase modulation (PM) obtains to comprise carrier wave and each rank side frequency to pump light, and the spacing of adjacent spectral line equals the frequency of modulation signal to narrower pulse.Every spectral line all can correspondingly produce the brillouin gain spectrum of a 30～50MHz, and the stack of composing by each bar brillouin gain just can obtain wide full gain spectrum.Can obtain the tunable full gain spectrum of bandwidth by number and the spacing between each bar gain spectrum of adjusting gain spectrum.The present invention can access the bandwidth of bigger slower rays system and bigger relative time delay.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, this embodiment is made up of lasing light emitter 21, pump light source 17, direct impulse light source 16, fibre optic isolater 10, the three Polarization Controllers 11, adjustable attenuator 18, second fiber optical circulator 19, second single-mode fiber 20; Lasing light emitter 21 first output terminals are connected the input end of pump light source 17, the output terminal of pump light source 17 connects the input end of adjustable attenuator 18, the output terminal of adjustable attenuator 18 connects the first port one 9-1 of second fiber optical circulator 19, and the second port one 9-2 of second fiber optical circulator 19 connects an end of second single-mode fiber 20; Lasing light emitter 21 second output terminals are connected the input end of direct impulse light source 16, the output terminal of direct impulse light source 16 connects the input end of fibre optic isolater 10, the output terminal of fibre optic isolater 10 connects the input end of the 3rd Polarization Controller 11, the output terminal of the 3rd Polarization Controller 11 connects the other end of second single-mode fiber 20, the length of second single-mode fiber 20 is 500～1000 meters, the 3rd port one 9-3 of second fiber optical circulator 19 is an output terminal, and above-mentioned connection is optical fiber and connects; The direct impulse light frequency that pumping light frequency that pump light source 17 produces and direct impulse light source 16 produce differs the Brillouin shift that one second single-mode fiber 20 is produced.
Embodiment two: the lasing light emitter 21 of this embodiment is made up of fiber laser 1, first fiber coupler 2; The output terminal of fiber laser 1 connects the input port 2-1 of first fiber coupler 2, the first output port 2-2 of first fiber coupler 2 connects the input port of pump light source 17, the second output port 2-3 of first fiber coupler 2 connects the input port of direct impulse light source 16, and the coupling ratio of first fiber coupler 2 is 60: 40～40: 60; Other composition is identical with embodiment one with annexation.
Embodiment three: the pump light source 17 of this embodiment is made up of fibre optic polarizer 12, phase-modulator 13, modulating signal source 14, Erbium-Doped Fiber Amplifier (EDFA) 15; First output port of lasing light emitter 21 connects the input port of fibre optic polarizer 12, the output port of fibre optic polarizer 12 connects the input port of phase-modulator 13, the output terminal of modulating signal source 14 connects the electrical input of phase-modulator 13, the output terminal of phase-modulator 13 connects the input end of Erbium-Doped Fiber Amplifier (EDFA) 15, and the output terminal of Erbium-Doped Fiber Amplifier (EDFA) 15 is the output terminal of pump light source 17; Except being connected to circuit is connected of modulating signal source 14 and phase-modulator 13, remaining connection is optical fiber and connects in the connection of above-mentioned each device; Fibre optic polarizer 12 is complementary lasing light emitter 21 output polarization state of light and phase-modulator 13 input ends, and the output power of fiber laser 1 is 100mW, and model is KOHERAS ADJUSTIK
TM(KOHERAS company, Denmark), the model of modulating signal source 14 is DG3000 (Rigol company, Beijing), and the model of Erbium-Doped Fiber Amplifier (EDFA) 15 is KPS-BT2-C-BO-FA (Keopsys company, a France), and other composition is identical with embodiment two with annexation.
Embodiment four: the direct impulse light source 16 of this embodiment is made up of first fiber optical circulator 3, first Polarization Controller 4, second fiber coupler 5, first single-mode fiber 6, second Polarization Controller 7, intensity modulator 8, electric pulse generator 9; Second output port of lasing light emitter 21 connects the first port 3-1 of first fiber optical circulator 3, the 3rd port 3-3 of first fiber optical circulator 3 connects the input end of first Polarization Controller 4, the output terminal of first Polarization Controller 4 connects the input port 5-1 of second fiber coupler 5, the first output port 5-2 of second fiber coupler 5 connects an end of first single-mode fiber 6, the other end of first single-mode fiber 6 connects the second port 3-2 of first fiber optical circulator 3, the second output port 5-3 of second fiber coupler 5 connects the input end of second Polarization Controller 7, the input end of the output terminal strength of joint modulator 8 of second Polarization Controller 7, the electric signal input end of the output terminal strength of joint modulator 8 of electric pulse generator 9, the output terminal of intensity modulator 8 is the output terminal of direct impulse light source 16; First fiber optical circulator 3, first Polarization Controller 4, second fiber coupler 5 and first single-mode fiber 6 are formed the Brillouin light fibre annular-type cavity; Being connected to circuit is connected except electric pulse generator 9 and intensity modulator 8 during above-mentioned each device connects, remaining connection is optical fiber and connects, the coupling ratio of second fiber coupler 5 is 5: 95～50: 50, and the length of first single-mode fiber 6 is 500～1000 meters; Other composition is identical with embodiment three with annexation.
Principle of work:
The laser of fiber laser 1 output has 60%～40% laser to be injected into fibre optic polarizer 12 from the first output port 2-2 by first fiber coupler 2, the polarization state that fibre optic polarizer 12 is regulated laser makes it to be complementary with the modulation signal of modulating signal source 14, the laser that fibre optic polarizer 12 is regulated is input in the phase-modulator 13, it is the multiline pump light that modulating signal source 14 will be imported Laser Modulation by phase-modulator 13, amplifies and output multiline pump light by Erbium-Doped Fiber Amplifier (EDFA) 15; The laser of fiber laser 1 output has 40%～60% second output port 2-3 by first fiber coupler 2 to be injected into the first port 3-1 of first fiber optical circulator 3 in addition, the second port 3-2 by first fiber optical circulator 3 is injected in first single-mode fiber 6, the laser that first fiber optical circulator 3 injects is as the pump light of brillouin fiber ring laser, in brillouin fiber ring laser, produce a Brillouin laser opposite with pump direction, the Brillouin laser that direction is opposite enters into the second port 3-2 of first fiber optical circulator 3, the effect that the 3rd port 3-3 by first fiber optical circulator 3 is injected into first Polarization Controller, 4, the first Polarization Controllers 4 is that the pumping polarization state of light of importing from the second port 3-2 of the polarization state of the Brillouin laser of the 3rd port output of first fiber optical circulator 3 and first fiber optical circulator 3 is complementary; Brillouin laser has 5%～50% laser to refill first single-mode fiber 6 as feedback from the first output port 5-2 by second fiber coupler 5, other has 95%～50% laser to be injected into the input end of second Polarization Controller 7 by the second output port 5-3 of second fiber coupler 5, the effect of second Polarization Controller 7 is to make from the polarization state of the Brillouin laser of the second output port 5-3 of second fiber coupler 5 output and the input end of intensity modulator 8 to be complementary, and the output signal of electric pulse generator 9 is loaded into the Brillouin laser that makes output on the intensity modulator 8 and is modulated into impulse form as direct impulse light; Direct impulse light is injected into the input end of the 3rd Polarization Controller 11 by fibre optic isolater 10, the effect of fibre optic isolater 10 is to prevent that the pump light that pump light source 17 produces from feeding back in the direct impulse light source 16, the 3rd Polarization Controller 11 is injected into an end of second single-mode fiber 20 with direct impulse light, and the effect of the 3rd Polarization Controller 11 is that the direct impulse light that direct impulse light source 16 produces and the pump light polarization state of pump light source 17 generations are complementary; Be injected into the first port one 9-1 of second fiber optical circulator 19 by adjustable attenuator 18 by the pump light of pump light source 17 generations, be injected into the other end of second single-mode fiber 20 by the second port one 9-2 of second fiber optical circulator 19, adjustable attenuator 18 is used to regulate the power of the pump light of incident, direct impulse light in second single-mode fiber 20, amplified by pump light and delay time after be input to the second port one 9-2 of second fiber optical circulator 19, at last from the 3rd port one 9-3 output of second fiber optical circulator 19.The pump light that direct impulse light that described direct impulse light source 16 produces and pump light source 17 produce differs the Brillouin shift that is produced in one second single-mode fiber 20.
Claims (3)
1, based on the stimulated Brillouin scattering adjustable light pulse time-delay device with wide bandwidth and multiple gains, it is characterized in that it comprises lasing light emitter (21), pump light source (17), direct impulse light source (16), fibre optic isolater (10), the 3rd Polarization Controller (11), adjustable attenuator (18), second fiber optical circulator (19), second single-mode fiber (20); Lasing light emitter (21) first output terminals are connected the input end of pump light source (17), the output terminal of pump light source (17) connects the input end of adjustable attenuator (18), the output terminal of adjustable attenuator (18) connects first port (19-1) of second fiber optical circulator (19), and second port (19-2) of second fiber optical circulator (19) connects an end of second single-mode fiber (20); Lasing light emitter (21) second output terminals are connected the input end of direct impulse light source (16), the output terminal of direct impulse light source (16) connects the input end of fibre optic isolater (10), the output terminal of fibre optic isolater (10) connects the input end of the 3rd Polarization Controller (11), the output terminal of the 3rd Polarization Controller (11) connects the other end of second single-mode fiber (20), and the 3rd port (19-3) of second fiber optical circulator (19) is an output terminal; Pump light source (17) is made up of fibre optic polarizer (12), phase-modulator (13), modulating signal source (14), Erbium-Doped Fiber Amplifier (EDFA) (15); First output port of lasing light emitter (21) connects the input port of fibre optic polarizer (12), the output port of fibre optic polarizer (12) connects the input port of phase-modulator (13), the output terminal of modulating signal source (14) connects the electrical input of phase-modulator (13), the output terminal of phase-modulator (13) connects the input end of Erbium-Doped Fiber Amplifier (EDFA) (15), and the output terminal of Erbium-Doped Fiber Amplifier (EDFA) (15) is the output terminal of pump light source (17).
2, according to claim 1 based on the stimulated Brillouin scattering adjustable light pulse time-delay device with wide bandwidth and multiple gains, the lasing light emitter (21) that it is characterized in that it is by fiber laser (1), first fiber coupler (2) is formed, the output terminal of fiber laser (1) connects the input port (2-1) of first fiber coupler (2), first output port (2-2) of first fiber coupler (2) connects the input port of pump light source (17), second output port (2-3) of first fiber coupler (2) connects the input port of direct impulse light source (16), and the coupling ratio of first fiber coupler (2) is 60: 40～40: 60.
3, according to claim 1 and 2 based on the stimulated Brillouin scattering adjustable light pulse time-delay device with wide bandwidth and multiple gains, it is characterized in that its direct impulse light source (16) is made up of first fiber optical circulator (3), first Polarization Controller (4), second fiber coupler (5), first single-mode fiber (6), second Polarization Controller (7), intensity modulator (8), electric pulse generator (9); Second output port of lasing light emitter (21) connects first port (3-1) of first fiber optical circulator (3), the 3rd port (3-3) of first fiber optical circulator (3) connects the input end of first Polarization Controller (4), the output terminal of first Polarization Controller (4) connects the input port (5-1) of second fiber coupler (5), first output port (5-2) of second fiber coupler (5) connects an end of first single-mode fiber (6), the other end of first single-mode fiber (6) connects second port (3-2) of first fiber optical circulator (3), second output port (5-3) of second fiber coupler (5) connects the input end of second Polarization Controller (7), the input end of the output terminal strength of joint modulator (8) of second Polarization Controller (7), the electric signal input end of the output terminal strength of joint modulator (8) of electric pulse generator (9), the output terminal of intensity modulator (8) swash the output terminal of device (16) for direct impulse light.
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| CN101866091B (en) * | 2009-04-15 | 2012-06-13 | 中国科学院物理研究所 | Programmable optical pulse delay unit and electric pulse delay unit |
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