CN116626953A - Microwave photon filter based on stimulated Brillouin scattering effect - Google Patents

Microwave photon filter based on stimulated Brillouin scattering effect Download PDF

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CN116626953A
CN116626953A CN202310374342.9A CN202310374342A CN116626953A CN 116626953 A CN116626953 A CN 116626953A CN 202310374342 A CN202310374342 A CN 202310374342A CN 116626953 A CN116626953 A CN 116626953A
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optical
microwave photon
stimulated brillouin
photon filter
frequency
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史双瑾
李浩然
张雨春
王云祥
邱琪
钱嘉炜
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/212—Mach-Zehnder type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  in optical waveguides, not otherwise provided for in this subclass
    • G02F1/0115—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  in optical waveguides, not otherwise provided for in this subclass in optical fibres

Abstract

The invention belongs to the technical field of microwave photonics, and provides a microwave photon filter based on a stimulated Brillouin scattering effect, which is used for solving the problem that the input dynamic range of the existing microwave photon filter is lower due to the influence of the stimulated Brillouin scattering gain saturation effect. The invention comprises a laser source CW, an arbitrary waveform generator AWG, a double parallel Mach-Zehnder modulator DPMZM, an erbium-doped optical fiber amplifier EDFA, an optical circulator OC, a tunable laser source TLS, a phase modulator PM, a signal source SG, an optical isolator ISO, a high nonlinear optical fiber HNLF and a photoelectric detector PD, wherein in the high nonlinear optical fiber, the stimulated Brillouin loss spectrum excited by pumping light is used for processing a lower light edge band generated by phase modulation, but not a gain spectrum, so that the influence of the stimulated Brillouin gain saturation effect is avoided, and a microwave photon filter has a large input dynamic range; in addition, the filter has good tuning and passband reconstruction characteristics.

Description

Microwave photon filter based on stimulated Brillouin scattering effect
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly provides a microwave photon filter based on stimulated Brillouin scattering effect.
Background
In a communication system, the quality of the transmitted signal is often affected by various noise and spurious signals within the communication system; in order to obtain high quality signals, it is necessary to eliminate or suppress noise and spurious signals in the communication system, thereby improving the spectral purity of the signals; to achieve this, a filter is typically used to process the signal. However, conventional microwave filters are limited by electronic bottlenecks, which make it difficult to achieve tuning and passband reconstruction in the high frequency band.
Microwave photonics is an emerging interdisciplinary science of combining microwave technology with photonics technology, and mainly researches the interaction of microwaves and light, and particularly researches how to generate, transmit and process microwave signals through an optical method; the microwave photonics can overcome the electronic bottleneck of the traditional microwave technology in the aspects of processing speed, transmission bandwidth and the like, and has the advantages of wide working frequency band, large transmission bandwidth, small transmission loss, no electromagnetic interference and the like. Microwave photon filters are one of the important products in the development of microwave photonics, and are used to take on the same work tasks in RF links and systems as conventional microwave filters and to solve the electronic bottlenecks faced by conventional microwave filters. In conventional microwave filters, radio frequency signals from a radio frequency source or antenna are injected into a radio frequency circuit for processing; in the microwave photon filter, the radio frequency signal is firstly loaded on an optical carrier, and then the filtering processing is carried out in the optical domain by optical means.
Therefore, as a microwave photon system, the microwave photon filter has the advantages of the microwave photonics, can overcome the electronic bottleneck faced by the traditional microwave filter, and can realize large tuning range and passband reconstruction in the high frequency band. Among the numerous microwave photon filters, the microwave photon filter based on stimulated brillouin scattering effect is a research hot spot because of the flexibility in tuning and passband reconstruction; the existing microwave photon filter based on the stimulated Brillouin scattering effect is mostly affected by the saturation effect of the stimulated Brillouin scattering gain, so that the input dynamic range of the microwave photon filter is low, and when facing a signal with a large dynamic range, the signal is distorted.
Disclosure of Invention
The invention aims to provide a microwave photon filter based on the stimulated Brillouin scattering effect, aiming at the problem that the existing microwave photon filter based on the stimulated Brillouin scattering effect is affected by the saturated effect of the stimulated Brillouin scattering gain and has a lower input dynamic range; according to the invention, the microwave photon filter processes the light sideband output by the phase modulator by using the Brillouin loss spectrum (rather than the gain spectrum), so that the influence of the stimulated Brillouin scattering gain saturation effect is avoided, and the input dynamic range of the device is further effectively improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a microwave photon filter based on stimulated brillouin scattering effect, comprising: a laser source CW (1), an arbitrary waveform generator AWG (2), a dual parallel Mach-Zehnder modulator DPMZM (3), an erbium-doped fiber amplifier EDFA (4), an optical circulator OC (5), a tunable laser source TLS (6), a phase modulator PM (7), a signal source SG (8), an optical isolator ISO (9), a high nonlinear fiber HNLF (10) and a photodetector PD (11); the method is characterized in that:
the light emitted by the laser source CW (1) enters a dual-parallel Mach-Zehnder modulator DPMZM (3), the dual-parallel Mach-Zehnder modulator DPMZM (3) outputs an optical frequency comb under the modulation of an electric frequency comb emitted by an arbitrary waveform generator AWG (2), the output optical frequency comb is amplified by an erbium-doped optical fiber amplifier EDFA (4) and then enters a high-nonlinearity optical fiber HNLF (10) as pumping light, the stimulated Brillouin scattering effect is generated, and a Brillouin loss spectrum is excited to attenuate reverse transmission light in the high-nonlinearity optical fiber HNLF (10);
the tunable laser source TLS (6) sends out an optical carrier wave to enter the phase modulator PM (7), the signal source SG (8) sends out a microwave signal to modulate the optical carrier wave in the phase modulator PM (7), and the optical carrier wave generates an upper optical sideband and a lower optical sideband under the modulation of a small signal; the optical carrier and the two optical sidebands are used as reverse transmission light, the optical carrier and the two optical sidebands are subjected to laser Brillouin attenuation in a high-nonlinearity optical fiber HNLF (10) through an optical isolator ISO (9), and then the optical carrier and the two optical sidebands reach a photoelectric detector PD (11) to perform photoelectric conversion, and the photoelectric detector PD (11) outputs an electric signal.
Further, the frequency response function of the microwave photon filter is as follows:
wherein H (f) e ) Representing the frequency response function, f, of a microwave photon filter e The frequency of the microwave signal is output for the signal source SG, f c For tunable laser source TLS outputting the center frequency of the optical carrier wave, V π Is half-wave voltage, R is responsivity of the photoelectric detector PD, H SBS Is the transfer function of the brillouin loss spectrum.
Furthermore, the brillouin loss spectrum is used for carrying out attenuation processing on the phase modulation light side band instead of the gain spectrum, and the processing mode can avoid the influence of the stimulated brillouin scattering gain saturation effect, so that the input dynamic range of the filter is increased.
Further, an optical isolator ISO (9) is used to cancel the pump light output from the highly nonlinear fiber HNLF (10) to avoid the effect on the tunable laser source TLS (6).
Further, the highly nonlinear fiber HNLF (10) is used as a medium for exciting the stimulated Brillouin scattering effect, the length of the fiber HNLF is selected to be 1-10 km, and the threshold for generating the stimulated Brillouin scattering effect can be reduced by properly increasing the length of the fiber HNLF.
Furthermore, the pump light frequency comb is changed by adjusting the output signal of the arbitrary waveform generator AWG (2), so that the Brillouin loss spectrum is changed, and the reconstruction of the filter passband is finally realized.
Further, tuning of the center frequency of the filter passband is achieved by adjusting the optical carrier frequency output by the tunable laser source TLS (6).
In terms of working principle:
the invention provides a microwave photon filter based on stimulated Brillouin scattering effect, which outputs a light field E from a laser source CW 0-in (t) can be expressed as:
E 0-in (t)＝E 0 exp(j2πf 0 t)
wherein E is 0 For outputting the amplitude of the light field for the laser source CW, f 0 Outputting the central frequency of a light field for a laser source CW, wherein t is a time variable;
the double parallel Mach-Zehnder modulator consists of three Mach-Zehnder modulators, wherein one sub Mach-Zehnder modulator MZM-alpha and one sub Mach-Zehnder modulator MZM-beta respectively exist on two interference arms of one marco-Mach-Zehnder modulator MZM-gamma, and the transfer functions of the double parallel Mach-Zehnder modulator are as follows:
wherein V is π Is half-wave voltage, V RF-α And V RF-β Radio frequency signals loaded on MZM-alpha and MZM-beta respectively, V bias-α 、V bias-β And V bias-γ Bias voltages on MZM-alpha, MZM-beta and MZM-gamma, respectively;
when MZM-alpha and MZM-beta are biased at the lowest power transmission point, and are loaded with radio frequency signals with the same frequency and amplitude and pi/2 phase difference, namely V RF-α ＝V RF cos(2πf m t) and V RF-β ＝V RF sin(2πf m t)，V RF For the amplitude of the radio frequency signal, f m Is the frequency of the radio frequency signal; meanwhile, when the bias voltage on the MZM-gamma introduces pi/2 phase shift between two sub Mach-Zehnder modulators, the transfer function can be expressed as follows:
when V is RF When the laser source CW is small, after passing through the double parallel Mach-Zehnder modulator, the optical field becomes:
as can be seen from the above, after the light output by the laser source CW passes through the dual parallel mach-zehnder modulators, the frequency of the light is shifted down by the frequency shift amount of the loaded radio frequency signal.
When the arbitrary waveform generator sends out the electric frequency combAfter being input to the double parallel Mach-Zehnder modulator, the output optical field is:
the optical field expressed above is an optical frequency comb, and the optical frequency comb is amplified by an erbium-doped fiber amplifier and then enters a high-nonlinearity fiber as pumping light for exciting a Brillouin loss spectrum; the transfer function of the loss spectrum under the action of an optical frequency comb can be expressed as:
wherein, Γ B 2 pi represents the inherent bandwidth of the brillouin loss spectrum, L represents the length of the highly nonlinear optical fiber, g 0 Represents the gain coefficient of the brillouin peak value, f B I is the Brillouin frequency shift amount m Representing the intensity of each comb tooth in the optical frequency comb; the shape of the visible loss spectrum can be reconstructed by changing the comb tooth spacing, the number and the intensity of the optical frequency comb.
The optical carrier wave emitted by the tunable laser source TLS is input into the phase modulator, and the low-power radio frequency signal V is output by the signal source e cos(2πf e t) modulating an optical carrier in a phase modulator, wherein under small signal modulation, an output optical field of the phase modulator only comprises the optical carrier and an upper optical sideband and a lower optical sideband; if the optical carrier E is input c-in (t) is:
E c-in (t)＝E c exp(j2πf c t)
wherein E is c For outputting the amplitude of the optical field for the tunable laser source TLS, f c Outputting a center frequency of the optical field for the tunable laser source TLS;
the output light field can be expressed as:
wherein J is 0 (β)、J 1 (beta) is the 0 th and 1 st order Bessel functions respectively,V e outputting a signal amplitude for the signal source;
the optical carrier and the upper and lower optical sidebands are input into a high nonlinear optical fiber, and in the high nonlinear optical fiber, the intensity of the lower optical sideband is affected by the Brillouin loss effect, so that the optical field detected on the photoelectric detector is as follows:
on the photoelectric detector, photoelectric conversion is carried out on an optical carrier and an upper optical sideband and a lower optical sideband, and an output radio frequency signal is as follows:
wherein R represents the responsivity of the photodetector;
therefore, the frequency response function of the microwave photon filter is:
from the frequency response function of the microwave photon filter, when f c -f e When in the loss spectrum, H SBS (f c -f e )＜1，H(f e ) Not equal to 0, representing that the filter allows the signal of that frequency to pass, thus forming a passband; when f c -f e When the loss spectrum is outside, H SBS (f e )＝1，H(f c -f e ) =0, which represents that the filter does not allow the signal of this frequency to pass, thus forming a stop band.
From the foregoing analysis, it can be seen that the passband shape of the microwave photon filter in the present invention is dependent on the shape of the brillouin loss spectrum, which can be changed by adjusting the output of the arbitrary waveform generator, and thus the reconstruction of the filter passband can be achieved by changing the output of the arbitrary waveform generator. As can be seen from the frequency response function of the microwave photon filter, the center frequency of the passband depends on f c -f e So by adjusting the size of the tunable laser source TLS to output the optical carrier frequency f c Can be tuned to the center frequency of the filter passband. In addition, the microwave photon filter processes the optical sideband output by the phase modulator by using the Brillouin loss spectrum (rather than the gain spectrum), so that the gain saturation effect is avoided, and the dynamic range of an input signal can be improved.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a microwave photon filter based on stimulated Brillouin scattering effect, which is characterized in that in a high-nonlinearity optical fiber, a stimulated Brillouin loss spectrum excited by pumping light is used for processing a lower light sideband generated by phase modulation, but not a gain spectrum, so that the influence of the stimulated Brillouin gain saturation effect is avoided, and the microwave photon filter has a large input dynamic range; in addition, the filter has good tuning and passband reconstruction characteristics.
Drawings
Fig. 1 is a schematic structural diagram of a microwave photon filter based on stimulated brillouin scattering effect.
Fig. 2 is a schematic diagram of a phase-intensity modulation conversion principle in a microwave photon filter based on stimulated brillouin scattering effect.
Fig. 3 is a schematic diagram of an optical frequency comb generating structure in the microwave photon filter based on the stimulated brillouin scattering effect.
Fig. 4 is a graph of an optical frequency comb spectrum generated in the microwave photon filter based on the stimulated brillouin scattering effect.
Fig. 5 is a frequency response curve of a lower optical sideband generated by phase modulation in a microwave photon filter based on stimulated brillouin scattering effect and a conventional microwave photon filter according to the present invention at each power.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The present embodiment provides a microwave photon filter based on stimulated brillouin scattering effect, whose structure is shown in fig. 1, and specifically includes: a laser source CW (1), an arbitrary waveform generator AWG (2), a dual parallel Mach-Zehnder modulator DPMZM (3), an erbium-doped fiber amplifier EDFA (4), an optical circulator OC (5), a tunable laser source TLS (6), a phase modulator PM (7), a signal source SG (8), an optical isolator ISO (9), a high nonlinear fiber HNLF (10) and a photodetector PD (11).
Specifically:
light emitted by the laser source CW (1) enters the dual-parallel Mach-Zehnder modulator DPMZM (3), and the dual-parallel Mach-Zehnder modulator DPMZM (3) outputs an optical frequency comb under the modulation of an electrical frequency comb emitted by the arbitrary waveform generator AWG (2); the optical frequency comb output by the double parallel Mach-Zehnder modulator DPMZM (3) is amplified by the erbium-doped optical fiber amplifier EDFA (4) and then used as pump light to enter the high-nonlinearity optical fiber HNLF (10), the stimulated Brillouin scattering effect is generated, and a Brillouin loss spectrum is excited and used for attenuating the pump light reversely transmitted in the high-nonlinearity optical fiber HNLF (10);
the tunable laser source TLS (6) sends out an optical carrier wave to enter the phase modulator PM (7), the signal source SG (8) sends out a microwave signal to modulate the optical carrier wave in the phase modulator PM (7), and the optical carrier wave generates an upper optical sideband and a lower optical sideband under the modulation of a small signal; the optical carrier and the two optical sidebands pass through an optical isolator ISO (9) and are affected by Brillouin loss spectrum in a high nonlinear optical fiber HNLF (10) and then reach a photoelectric detector PD (11) through an optical circulator OC (5) for photoelectric conversion; the filter utilizes the phase-intensity modulation conversion principle to map the optical frequency response characteristic of Brillouin to an electric domain, so that the construction of a filter frequency response curve is realized.
The phase-intensity modulation conversion principle in the microwave photon filter based on the stimulated brillouin scattering effect is shown in fig. 2, and specifically includes:
the CW output frequency of the laser source is f 0 When the light source is not modulated in the double parallel Mach-Zehnder modulator, the light source directly enters the high nonlinear optical fiber through the erbium-doped optical fiber amplifier, a Brillouin loss spectrum is generated in the high nonlinear optical fiber, the shape of the loss spectrum is shown as a dotted line in fig. 2, and the center frequency of the loss spectrum is the laser frequency f 0 And brillouin shift amount f B And (3) summing;
the tunable laser source TLS emits a frequency f c Is frequency f in a phase modulator e After the radio frequency signal of (1) is modulated, the output optical carrier wave of the phase modulator and the frequency are f respectively c +f e And f c -f e Upper and lower optical sidebands; because the two optical sidebands have the same amplitude and have the phase difference pi, the radio frequency signals loaded on the phase modulator cannot be recovered when photoelectric conversion is carried out on the photoelectric detector; when the lower optical sideband falls into the Brillouin loss spectrum, the amplitudes of the two sidebands are not identical any more, and when photoelectric conversion is carried out on the photoelectric detector, the radio frequency signal loaded on the phase modulator can be recovered, so that the phase-intensity modulation conversion is realized;
the pass band shape of the filter is determined by the shape of the brillouin loss spectrum due to the effect of phase-intensity conversion, so that the reconstruction of the pass band of the filter can be realized by changing the brillouin loss spectrum.
The optical frequency comb generating structure in the microwave photon filter based on the stimulated Brillouin scattering effect is shown in fig. 3, wherein the dual parallel Mach-Zehnder modulator DPMZM consists of two sub Mach-Zehnder modulators MZM-alpha, MZM-beta and one march-Zehnder modulator MZM-gamma;the light emitted by the laser source CW enters a double parallel Mach-Zehnder modulator, and an arbitrary waveform generator emits an electric frequency combModulating light in a dual parallel Mach-Zehnder modulator, wherein two sub-Mach-Zehnder modulators are biased at a lowest power transmission point, and a bias voltage V is applied by the march-Zehnder modulators bias-γ The output light of one of the sub Mach-Zehnder modulators is subjected to pi/2 phase shift, namely pi/2 phase difference between the electric frequency combs loaded on the two sub Mach-Zehnder modulators; if the input optical field at the input port in of the double parallel Mach-Zehnder modulator is E in (t)＝E 0 ·exp(j2πf 0 t), the light field at the output port out is:
the optical field is an optical frequency comb, in order to enable the microwave photon filter based on the stimulated Brillouin scattering effect to have a relatively flat passband, the comb tooth space of the optical frequency comb is about half of the 3dB bandwidth of the Brillouin spectral line, and the Brillouin line width is 30MHz, so that the comb tooth space of the optical frequency comb is 15MHz; because the comb teeth of the optical frequency comb are narrow, the line width of the selected laser source is 100kHz in order to ensure that the optical frequency comb has better spectral characteristics. The optical frequency comb spectrum is shown in fig. 4, wherein the circle is marked with a suppressed optical carrier; the left side of the suppressed optical carrier is the generated optical frequency comb, which comprises 5 comb teeth, the comb teeth interval is 15MHz, and the right side of the suppressed optical carrier is the suppressed optical sideband.
The frequency response curves of the lower optical sideband generated by phase modulation in the microwave photon filter based on the stimulated Brillouin scattering effect and the traditional microwave photon filter at each power are shown in fig. 5, wherein (a) represents the frequency response curve of the lower optical sideband in the traditional microwave photon filter under the effect of Brillouin gain, and (b) represents the frequency response curve of the lower optical sideband in the traditional microwave photon filter under the effect of Brillouin loss; as can be seen from fig. 5 (a), when the power of the lower optical sideband is-10 dBm, -20dBm, and-30 dBm, the maximum gain on the frequency response curve is 15dB, 20dB, and 22dB, respectively, which means that under the effect of the brillouin gain, the gain obtained by the lower optical sideband is affected by the power of the lower optical sideband, and the power of the lower optical sideband is directly related to the power of the radio frequency signal loaded on the phase modulator, so that the microwave photon filter based on the brillouin gain effect is a nonlinear system for the radio frequency signal with a large dynamic range (i.e., the power variation is large), and the distortion is generated after the radio frequency signal with a large dynamic range passes through the filter; as can be seen from fig. 5 (b), when the power of the lower optical sidebands is-10 dBm, -20dBm, and-30 dBm, respectively, the maximum loss on the frequency response curves is 26dB, which means that the lower optical sidebands have almost the same frequency response curves at different powers under the effect of the brillouin loss, and the microwave photon filter based on the brillouin loss effect is a linear system, so the microwave photon filter based on the brillouin loss effect can process a radio frequency signal with a large dynamic range and has a large input dynamic range compared with the microwave photon filter based on the basic Yu Buli-gain effect.
While the invention has been described in terms of specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the equivalent or similar purpose, unless expressly stated otherwise; all of the features disclosed, or all of the steps in a method or process, except for mutually exclusive features and/or steps, may be combined in any manner.

Claims (2)

1. A microwave photon filter based on stimulated brillouin scattering effect, comprising: a laser source CW (1), an arbitrary waveform generator AWG (2), a dual parallel Mach-Zehnder modulator DPMZM (3), an erbium-doped fiber amplifier EDFA (4), an optical circulator OC (5), a tunable laser source TLS (6), a phase modulator PM (7), a signal source SG (8), an optical isolator ISO (9), a high nonlinear fiber HNLF (10) and a photodetector PD (11); the method is characterized in that:
the light emitted by the laser source CW (1) enters a dual-parallel Mach-Zehnder modulator DPMZM (3), the dual-parallel Mach-Zehnder modulator DPMZM (3) outputs an optical frequency comb under the modulation of an electric frequency comb emitted by an arbitrary waveform generator AWG (2), the output optical frequency comb is amplified by an erbium-doped optical fiber amplifier EDFA (4) and then enters a high-nonlinearity optical fiber HNLF (10) as pumping light, the stimulated Brillouin scattering effect is generated, and a Brillouin loss spectrum is excited to attenuate reverse transmission light in the high-nonlinearity optical fiber HNLF (10);
the tunable laser source TLS (6) sends out an optical carrier wave to enter the phase modulator PM (7), the signal source SG (8) sends out a microwave signal to modulate the optical carrier wave in the phase modulator PM (7), and the optical carrier wave generates an upper optical sideband and a lower optical sideband under the modulation of a small signal; the optical carrier and the two optical sidebands are used as reverse transmission light, the optical carrier and the two optical sidebands are subjected to laser Brillouin attenuation in a high-nonlinearity optical fiber HNLF (10) through an optical isolator ISO (9), and then the optical carrier and the two optical sidebands reach a photoelectric detector PD (11) to perform photoelectric conversion, and the photoelectric detector PD (11) outputs an electric signal.
2. The stimulated brillouin effect-based microwave photon filter of claim 1, wherein a frequency response function of the microwave photon filter is:
wherein H (f) e ) Representing the frequency response function, f, of a microwave photon filter e The frequency of the microwave signal is output for the signal source SG, f c For tunable laser source TLS outputting the center frequency of the optical carrier wave, V π Is half-wave voltage, R is responsivity of the photoelectric detector PD, H SBS Is the transfer function of the brillouin loss spectrum.
CN202310374342.9A 2023-04-10 2023-04-10 Microwave photon filter based on stimulated Brillouin scattering effect Pending CN116626953A (en)

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