CN102931567A - All-optical microwave signal oscillator - Google Patents
All-optical microwave signal oscillator Download PDFInfo
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- CN102931567A CN102931567A CN2012104301193A CN201210430119A CN102931567A CN 102931567 A CN102931567 A CN 102931567A CN 2012104301193 A CN2012104301193 A CN 2012104301193A CN 201210430119 A CN201210430119 A CN 201210430119A CN 102931567 A CN102931567 A CN 102931567A
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Abstract
The invention discloses an all-optical microwave signal oscillator which comprises a microwave photon filtration module (1), a tunable optical bandpass filter (10), a polarization controller (11), an optical coupler (12), a light adjustable delay wire (13), an optical isolator (14) and a semiconductor optical amplifier B (15). The microwave photon filtration module (1), the tunable optical bandpass filter (10), the polarization controller (11), the optical coupler (12), the light adjustable delay wire (13), the optical isolator (14) and the semiconductor optical amplifier B (15) are connected in sequence through optical fiber to form a circular structure. The microwave photon filtration module (1) comprises a broadband light source (2), a plastic optical filter (3), an adjustable comb-shaped filter (4), a three-port optical circulator A (5), a semiconductor optical amplifier A (6), a three-port optical circulator B (7), an adjustable dispersion module (8) and a three-port optical circulator C (9). The all-optical microwave signal oscillator has the advantages of being tunable in microwave frequency and light carrier frequency, high in system stability and convenient and flexible to use.
Description
Technical field
The present invention relates to microwave technology and photoelectron technology field, relate in particular to a kind of full light microwave signal oscillator.
Background technology
Full light microwave signal oscillator is a kind of device that utilizes pure optics vibration generation photon microwave signal, its main implementation is to utilize the optics vibration to produce the light frequency of two phase place lockings, they can be used as the light microwave-subcarrier signal and directly transmit in optical fiber, form the light-carried wireless data-signal after perhaps loading data-signal, also can directly produce electric microwave signal by opto-electronic conversion.This microwave signal oscillator is at radio over fibre system (ROF), broadband wireless access, and radar system, there is important application in the fields such as sensing network.
Have at present the full light microwave signal oscillator of report to mainly contain two kinds:
One, the dual laser of semiconductor structure: it is to utilize semiconductor PN as gain media, and the resonant cavity of laser inside is selected two pattern starting of oscillations, obtains to have the dual-wavelength laser output of certain phase relation.This complete its centre wavelength tunability of light microwave signal oscillator is poor, and owing to the structural limitations in laser internal resonance chamber, the tuning range of microwave frequency is limited in addition;
Two, double-wavelength single-longitudinal-mode fiber laser: it is to place a sharp lase with two wavelength of optical filter realization at double transmission peak in fiber resonance cavity.The optical filter at the double transmission peak here mostly is the phase shift optical fiber Bragg grating.Its light wave centre frequency of the photon microwave oscillator of this structure is non-adjustable, and the continuously adjustable of microwave frequency is poor, and the stability of a system is not high.
Summary of the invention
A kind of microwave frequency that the object of the invention is to overcome above-mentioned shortcoming and provide and optical carrier frequency all tunable, the stability of a system is high, the full light microwave signal oscillator of easy to use and flexible.
Purpose of the present invention and solve its technical problem underlying and realize by the following technical solutions: a kind of full light microwave signal oscillator of the present invention, comprise the microwave photon filtration module, the tunable optical band pass filter, Polarization Controller, optical coupler, light adjustable delay line, optical isolator and semiconductor optical amplifier B(SOA), these parts are connected to become a loop configuration in turn by optical fiber, wherein the microwave photon filtration module comprises wideband light source, the shaping optical filter, adjustable comb-shaped filter, three ports light rings A, semiconductor optical amplifier A(SOA), three ports light rings B, adjustable dispersion module and three ports light rings C, wideband light source is connected with the shaping optical filter, the shaping optical filter is connected with adjustable comb-shaped filter, adjustable comb-shaped filter is connected with three ports light rings A ports, one a, three ports light rings A ports, two b and semiconductor optical amplifier A(SOA) be connected, semiconductor optical amplifier A(SOA) is connected with three ports light rings B ports two, three ports light rings B ports one are connected with three ports light rings C ports three, three ports light rings B ports three are connected with the adjustable dispersion module, the adjustable dispersion module is connected with three ports light rings C ports one, three ports light rings C ports two and semiconductor optical amplifier B(SOA) be connected, three ports light rings A ports three are connected with the tunable optical band pass filter.
Above-mentioned full light microwave signal oscillator, wherein: the shaping optical filter adopts Mach-Zehnder interferometer type (MZI) filter, and adjustable comb-shaped filter adopts Mach-Zehnder interferometer type (MZI) filter.The adjustable dispersion module adopts optical fiber.
Above-mentioned full light microwave signal oscillator, wherein: the shaping optical filter adopts the shaping optical filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, it comprises a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller A3a, one section high birefringence optical fiber A3b; Adjustable comb-shaped filter adopts the filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, comprise a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller B4a, one section high birefringence optical fiber B4b, the adjustable dispersion module adopts optical fiber.
Above-mentioned full light microwave signal oscillator, wherein: the microwave photon filtration module comprises wideband light source, adjustable comb-shaped filter, three ports light rings A, semiconductor optical amplifier A(SOA), three ports light rings B, adjustable dispersion module and three ports light rings C, wideband light source adopts super-radiance light emitting diode (superluminescent LED:SLED); Adjustable comb-shaped filter adopts the optical comb filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, optical comb filter is connected with three ports light rings A ports one, three ports light rings A ports two and semiconductor optical amplifier A(SOA) be connected, semiconductor optical amplifier A(SOA) is connected with three ports light rings B ports two, three ports light rings B ports one are connected with three ports light rings C ports three, adjustable dispersion module 8 is made of three ports light rings D and chirp grating, chirp grating is connected with three ports light rings D ports two, three ports light rings D ports one are connected with three ports light rings B ports three, three ports light rings D ports three are connected with three ports light rings C ports one, three ports light rings C ports two and semiconductor optical amplifier B(SOA) be connected, three ports light rings A ports three are connected with the tunable optical band pass filter.
The present invention compared with prior art, has obvious beneficial effect, as can be known from the above technical solutions: the transmission of loop light field can be considered from the spontaneous emission noise of semiconductor optical amplifier, be introduced into three port circulator C ports two, then from three outputs of three port circulator C ports, after this enter three port circulator B ports one, and enter semiconductor optical amplifier from the output of three port circulator B ports two, then enter three port circulator A ports two, and from three outputs of three port circulator A ports, after this successively by the tunable optical band pass filter, Polarization Controller, optical coupler, light adjustable delay line, optical isolator returns the input semiconductor optical amplifier at last.This moment, optical isolator determined that the vibration of light field is clockwise direction.Whole optical loop can inspire the optical mode that a series of wavelength that determined by loop-length are spaced apart Δ l, the centre wavelength l of light field
0Determined by the tunable optical band pass filter, the wave-length coverage of exportable light field is by the gain media semiconductor optical amplifier B(SOA in the loop) and semiconductor optical amplifier BA(SOA) the gain bandwidth decision; Polarization Controller is used for guaranteeing the polarization state of vibration light field in the loop, and light adjustable delay line is used for regulating the length of optical loop, changes the wavelength interval (Δ l) of institute's excitation mode in the loop with this.
The light field transmission direction of microwave photon filtration module is opposite with the orientation of oscillation of institute's excitation mode in the loop, and will end at optical isolator.Wideband light source in the microwave photon filtration module sends incoherent wide range ASE light radiation, this wide spectrum optical by the shaping optical filter after, obtain a light field envelope with Gaussian or accurate Gaussian.The shaping optical filter here can be prior art parts, and its centre wavelength is identical or close with the centre wavelength of wide spectrum light source, and bandwidth is equal to or slightly less than the bandwidth of wideband light source.Wide spectrum light source after the shaping is sliced into after via an adjustable comb-shaped filter and is one group to have the certain frequency interval (be the spectrum cycle of tunable filter: light output FSR), light field after the section enters three ports light rings A ports one, then enters semiconductor optical amplifier A(SOA from two outputs of three ports light rings A ports), at semiconductor optical amplifier A(SOA) in, the mode frequency that excites in the loop concerns l
0± n Δ l(here n is integer) will be modulated to by the nonlinear interaction among the SOA on the light field after the section, after this, the section light field of modulated mistake is inputted three ports light rings B ports two and from three outputs of three ports light rings B ports, enter the adjustable dispersion module, through the light field of adjustable dispersion module because the effect of dispersion will have frequency is
The band-pass response characteristic (wherein
Be the dispersion of chromatic dispersion material,
The length of expression chromatic dispersion material,
The total dispersion amount of expression dispersion module, FSR represents the spectrum cycle of adjustable comb-shaped filter), the light field of carrying this response characteristic enters two outputs of three ports light rings C ports, one, three ports light rings C ports after the output of adjustable dispersion module, then enter the semiconductor optical amplifier B(SOA in the loop).At semiconductor optical amplifier B(SOA) in, frequency
Response will be again non-linear modulation effect by SOA feed back in the loop, through after the feedback repeatedly, whole full light microwave signal oscillator with output frequency is
The photon microwave signal.Work as change
Perhaps FSR can be so that the microwave frequency that produces
Adjusted, final so that
(m is integer here).The present invention utilizes the Mode-Locking Cavity structure of a built-in microwave photon filtration module to produce the microwave photon signal, and it uses more flexible in the adjusting microwave frequency that keeps can further facilitating on the continuously adjustable basis of Mode-Locking Cavity optical wavelength.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2;
Fig. 3 is the structural representation of embodiment 3.
Mark wherein:
1, microwave photon filtration module; 2, wideband light source; 3, shaping optical filter; 3a, Polarization Controller A; 3b, high birefringence optical fiber A; 4, adjustable comb-shaped filter; 4a, Polarization Controller B, 4b, high birefringence optical fiber B; 5, three ports light rings A; 5a, three ports light rings A ports one; 5b, three ports light rings A ports two; 5c, three ports light rings A ports three; 6, semiconductor optical amplifier A(SOA); 7, three ports light rings B; 7a, three ports light rings B ports one; 7b, three ports light rings B ports two; 7c, three ports light rings B ports three; 8, adjustable dispersion module; 8a, three ports light rings D; 8b, chirp grating; 8aa, three ports light rings D ports one; 8ab, three ports light rings D ports two; 8ac, three ports light rings D ports three; 9, three ports light rings C; 9a, three ports light rings C ports one; 9b, three ports light rings C ports two; 9c, three ports light rings C ports three; 10, tunable optical band pass filter; 11, Polarization Controller; 12, optical coupler; 13, light adjustable delay line; 14, optical isolator; 15, semiconductor optical amplifier B(SOA).
?
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and the effect thereof of the full light microwave signal oscillator that foundation the present invention is proposed are described in detail as follows:
Embodiment 1:
With reference to Fig. 1, full light microwave signal oscillator, comprise microwave photon filtration module 1, tunable optical band pass filter 10, Polarization Controller 11, optical coupler 12, light adjustable delay line 13, optical isolator 14 and semiconductor optical amplifier B(SOA) 15, these parts are connected to become a loop configuration in turn by optical fiber, wherein microwave photon filtration module 1 comprises wideband light source 2, shaping optical filter 3, adjustable comb-shaped filter 4, three ports light rings A5, semiconductor optical amplifier A(SOA) 6, three ports light rings B7, adjustable dispersion module 8 and three ports light rings C9, wideband light source 2 is connected with shaping optical filter 3, shaping optical filter 3 is connected with adjustable comb-shaped filter 4, adjustable comb-shaped filter 4 is connected with three ports light rings A ports, one 5a, three ports light rings A ports, two 5b and semiconductor optical amplifier A(SOA) 6 be connected, semiconductor optical amplifier A(SOA) 6 are connected with three ports light rings B ports, two 7b, three ports light rings B ports, one 7a is connected with three ports light rings C ports, three 9c, three ports light rings B ports, three 7c are connected with adjustable dispersion module 8, adjustable dispersion module 8 is connected with three ports light rings C ports, one 9a, three ports light rings C ports, two 9b and semiconductor optical amplifier B(SOA) 15 be connected, three ports light rings A ports, three 5c are connected with tunable optical band pass filter 10.
Wherein shaping optical filter 3 adopts Mach-Zehnder interferometer type (MZI) filter, and adjustable comb-shaped filter 4 adopts Mach-Zehnder interferometer type (MZI) filter.Adjustable dispersion module 8 adopts optical fiber.
Operation principle is: whole optical loop can inspire a series of optical modes that are spaced apart Δ l that determined by loop-length, this moment, optical isolator 14 determined that the vibration of light field is clockwise direction, the centre wavelength of light field determines by tunable optical band pass filter 10, and the wave-length coverage of exportable light field is by the gain media semiconductor optical amplifier B(SOA in the loop) 15 and the gain bandwidth of semiconductor optical amplifier (SOA) A6 determine; Polarization Controller 11 is used for guaranteeing the polarization state of vibration light field in the loop, and the length that light adjustable delay line 13 is used for regulating optical loop changes the wavelength interval (Δ l) of institute's excitation mode in the loop with this.
Wideband light source 2 can produce the wide spectrum optical radiation, it can be that Er-doped fiber is subjected to the stimulated radiation noise (ASE) of the amplification that pumping inspires or is the wideband light source of prior art parts, and this light radiation is input to the shaping optical filter 3 of Mach-Zehnder interferometer type (MZI).Up and down two arms of MZI have length difference Δ L
1, determined thus the up and down optical path difference of two-way
(here
Expression is the transmission of two arms up and down).This optical path difference final decision MZI have its expression formula of periodic transmissivity and be
, its frequency period is
, c is the light velocity here, n is the refractive index of material.Therefore, carefully set Δ L
1Size, can be so that the center of transmission peaks center of MZI and wideband light source 2 approaches, and its bandwidth is identical or close with the bandwidth of wideband light source 2, so that have the envelope of approximate Gaussian type by the wideband light source of shaping optical filter 3, reaches the effect of shaping.Enter the tunable filter 4 of next Mach-Zehnder interferometer type (MZI) from the light field of shaping optical filter 3 outputs, tunable filter 4 is similar with the structure of shaping optical filter 3, and still two arm lengths are poor is Δ L
2, as Δ L
2When larger, can obtain less FSR, thereby the light field after shaping section can be obtained a plurality of filter taps, the frequency interval between tap by
Determine.Light field after the section enters port one 5a of three ports light rings A, then enter semiconductor optical amplifier (SOA) 6 from port two 5b output, in semiconductor optical amplifier (SOA) 6, the mode frequency that excites in the loop concern n Δ l(here n be integer) will be modulated to by the non-linear modulation effect among the SOA on the light field after the section, after this, the section light field of modulated mistake is inputted port two 7b of three ports light rings B and is exported from port three 7c, enter adjustable dispersion module 8, through the light field of adjustable dispersion module 8 because the effect of dispersion will have frequency is
The band-pass response characteristic (wherein
Be the dispersion of chromatic dispersion material,
The length of expression chromatic dispersion material,
The total dispersion amount of expression dispersion module, FSR represents the spectrum cycle of adjustable comb-shaped filter), the light field of carrying this response characteristic enters port one 9a of three ports light rings C and from port two 9b output, then enters the semiconductor optical amplifier (SOA) 15 in the loop after 8 outputs of adjustable dispersion module.In semiconductor optical amplifier (SOA) 15, frequency
Response will be again non-linear modulation effect by SOA feed back in the loop, through after the feedback repeatedly, whole full light microwave signal oscillator with output frequency is
The photon microwave signal.Work as change
Perhaps FSR can be so that the microwave frequency that produces
Adjusted, need to regulate simultaneously light adjustable delay line this moment to satisfy
(m is integer).
Embodiment 2:
With reference to Fig. 2, a kind of full light microwave signal oscillator, comprise microwave photon filtration module 1, tunable optical band pass filter 10, Polarization Controller 11, optical coupler 12, light adjustable delay line 13, optical isolator 14 and semiconductor optical amplifier B(SOA) 15, these parts are connected to become a loop configuration in turn by optical fiber, wherein microwave photon filtration module 1 comprises wideband light source 2, shaping optical filter 3, adjustable comb-shaped filter 4, three ports light rings A5, semiconductor optical amplifier A(SOA) 6, three ports light rings B7, adjustable dispersion module 8 and three ports light rings C9, wideband light source 2 is connected with shaping optical filter 3, shaping optical filter 3 is connected with adjustable comb-shaped filter 4, adjustable comb-shaped filter 4 is connected with three ports light rings A ports, one 5a, three ports light rings A ports, two 5b and semiconductor optical amplifier A(SOA) 6 be connected, semiconductor optical amplifier A(SOA) 6 are connected with three ports light rings B ports, two 7b, three ports light rings B ports, one 7a is connected with three ports light rings C ports, three 9c, three ports light rings B ports, three 7c are connected with adjustable dispersion module 8, adjustable dispersion module 8 is connected with three ports light rings C ports, one 9a, three ports light rings C ports, two 9b and semiconductor optical amplifier B(SOA) 15 be connected, three ports light rings A ports, three 5c are connected with tunable optical band pass filter 10.
Wherein shaping optical filter 3 adopts the shaping optical filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, it comprises a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller A3a, one section high birefringence optical fiber A3b; Adjustable comb-shaped filter (4) adopts the filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, comprise a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller B4a, one section high birefringence optical fiber B4b, adjustable dispersion module 8 adopts optical fiber.
Operation principle is: in microwave photon filtration module 1, shaping optical filter 3 and adjustable comb-shaped filter 4 are the filter of two High-Birefringence Fiber Loop shape mirrors (HB-FLM) type.The filter construction of High-Birefringence Fiber Loop shape mirror (HB-FLM) type is one and two outputs of three-dB coupler are connected consist of an annular, and a Polarization Controller and one section high birefringence optical fiber are placed by section within it, because the refractive index missionary society between the fast axle of high birefringence optical fiber and slow axis introduces the phase difference of clockwise direction and counter clockwise direction two-way light field in HB-FLM, and then at Coupling point formation interference effect, frequency in transmission end property performance period is selected, and finishes filter function.The Polarization Controller here can be regulated the polarization state in the HB-FLM, and to reach best interference effect, frequency period and the three dB bandwidth of High-Birefringence Fiber Loop shape mirror (HB-FLM) mode filter are respectively:
With
, here
Be the work centre wavelength,
For the bat of high birefringence optical fiber long,
Be the length of high birefringence optical fiber,
Be the refringence between the high birefringence optical fiber fast and slow axis.Therefore, with the function class of two MZI among the embodiment 1 seemingly, choose reasonable
With
Size, can realize respectively shaping filter and spectrum section function to wideband light source 2.All the other are with embodiment 1.
Embodiment 3:
With reference to Fig. 3, full light microwave signal oscillator, comprise microwave photon filtration module 1, tunable optical band pass filter 10, Polarization Controller 11, optical coupler 12, light adjustable delay line 13, optical isolator 14 and semiconductor optical amplifier B(SOA) 15, these parts are connected to become a loop configuration in turn by optical fiber, wherein microwave photon filtration module 1 comprises wideband light source 2, adjustable comb-shaped filter 4, three ports light rings A5, semiconductor optical amplifier A(SOA) 6, three ports light rings B7, adjustable dispersion module 8 and three ports light rings C9, wideband light source 2 adopts super-radiance light emitting diode (superluminescent LED:SLED); Adjustable comb-shaped filter 4 adopts the optical comb filter of High-Birefringence Fiber Loop shape mirror (HB-FLM) type, adjustable comb-shaped filter 4 is connected with three ports light rings A ports, one 5a, three ports light rings A ports, two 5b and semiconductor optical amplifier A(SOA) 6 be connected, semiconductor optical amplifier A(SOA) 6 are connected with three ports light rings B ports, two 7b, three ports light rings B ports, one 7a is connected with three ports light rings C ports, three 9c, adjustable dispersion module 8 is made of three ports light rings D8a and chirp grating 8b, chirp grating 8b is connected with three ports light rings D ports, two 8ab, three ports light rings D ports, one 8aa is connected with three ports light rings B ports, three 7c, three ports light rings D ports, three 8ac are connected with three ports light rings C ports, one 9a, three ports light rings C ports, two 9b and semiconductor optical amplifier B(SOA) 15 be connected, three ports light rings A ports, three 5c are connected with tunable optical band pass filter 10.
Operation principle is: wideband light source 2 adopts super-radiance light emitting diodes (SLED) 2 to send the ASE light radiation with accurate Gaussian in microwave photon filtration module 1, therefore can dispense the shaping optical filter and directly enters adjustable comb-shaped filter 4.For adjustable dispersion module 8, it is made of three ports light rings D8a and chirp grating 8b.Light field after the section is inputted by three ports light rings D ports, one 8aa first, and enters chirp grating 8b from port two 8ab output.The reflectance spectrum of chirp grating 8b can produce different time-delays to the different wave length in the input light field, regulate the parameter of chirp grating 8b and can control total amount of delay size, this reflectance spectrum can be input to port two 8ab again, and from port three 8ac output, all the other are with embodiment 2.
Of the present inventionly be not limited to the embodiment described in the embodiment, those skilled in the art's technical scheme according to the present invention draws other execution mode, belongs to equally technological innovation scope of the present invention.Obviously, those skilled in the art can carry out various changes and modification to invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. full light microwave signal oscillator, it is characterized in that: comprise microwave photon filtration module (1), tunable optical band pass filter (10), Polarization Controller (11), optical coupler (12), light adjustable delay line (13), optical isolator (14) and semiconductor optical amplifier B(15), these parts are connected to become a loop configuration in turn by optical fiber.
2. full light microwave signal oscillator as claimed in claim 1, it is characterized in that: microwave photon filtration module (1) comprises wideband light source (2), shaping optical filter (3), adjustable comb-shaped filter (4), three ports light rings A(5), semiconductor optical amplifier A(6), three ports light rings B(7), adjustable dispersion module (8) and three ports light rings C(9), wideband light source (2) is connected with shaping optical filter (3), shaping optical filter (3) is connected with adjustable comb-shaped filter (4), adjustable comb-shaped filter (4) is connected with three ports light rings A ports one (5a), three ports light rings A ports two (5b) and semiconductor optical amplifier A(6) be connected, semiconductor optical amplifier A(6) is connected with three ports light rings B ports two (7b), three ports light rings B ports one (7a) are connected with three ports light rings C ports three (9c), three ports light rings B ports three (7c) are connected with adjustable dispersion module (8), adjustable dispersion module (8) is connected with three ports light rings C ports one (9a), three ports light rings C ports two (9b) and semiconductor optical amplifier B(15) be connected, three ports light rings A ports three (5c) are connected with tunable optical band pass filter (10).
3. full light microwave signal oscillator as claimed in claim 1 or 2, it is characterized in that: shaping optical filter (3) adopts Mach-Zehnder interferometer type filter, adjustable comb-shaped filter (4) adopts Mach-Zehnder interferometer type filter, and adjustable dispersion module (8) adopts optical fiber.
4. full light microwave signal oscillator as claimed in claim 1 or 2, it is characterized in that: shaping optical filter (3) adopts the shaping optical filter of High-Birefringence Fiber Loop shape mirror type, it comprises a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller A3a, one section high birefringence optical fiber A3b; Adjustable comb-shaped filter (4) adopts the filter of High-Birefringence Fiber Loop shape mirror type, comprise a loop that two outputs is formed by connecting by the 3dB optical coupler, wherein place Polarization Controller B4a, one section high birefringence optical fiber B4b, adjustable dispersion module 8 adopts optical fiber.
5. full light microwave signal oscillator as claimed in claim 1, it is characterized in that: microwave photon filtration module (1) comprises wideband light source (2), adjustable comb-shaped filter (4), three ports light rings A(5), semiconductor optical amplifier A(6), three ports light rings B(7), adjustable dispersion module (8) and three ports light rings C(9), wideband light source (2) adopts super-radiance light emitting diode; Adjustable comb-shaped filter (4) adopts the optical comb filter of High-Birefringence Fiber Loop shape mirror type, optical comb filter (4) is connected with three ports light rings A ports one (5a), three ports light rings A ports two (5b) and semiconductor optical amplifier A(6) be connected, semiconductor optical amplifier A(6) is connected with three ports light rings B ports two (7b), three ports light rings B ports one (7a) are connected with three ports light rings C ports three (9c), adjustable dispersion module (8) is by three ports light rings D(8a) and chirp grating (8b) formation, chirp grating (8b) is connected with three ports light rings D ports two (8ab), three ports light rings D ports one (8aa) are connected with three ports light rings B ports three (7c), three ports light rings D ports three (8ac), three ports light rings C ports one (9a) connect, three ports light rings C ports two (9b) and semiconductor optical amplifier B(15) be connected, three ports light rings A ports three (5c) are connected with tunable optical band pass filter (10).
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