Dual-band amplitude-phase equalization band-stop filter optical chip based on SBS effect

Abstract

The application provides a double-sideband amplitude-phase equalization band-stop filtering optical chip based on SBS effect, and relates to the technical field of optical chips.The double-sideband amplitude-phase equalization band-stop filtering optical chip based on SBS effect comprises a complementary optical filter, a first beam combination module, a forward stimulated Brillouin scattering generator, a phase modulator, a band-stop optical filter and a second beam combination module.The application amplifies the upper sideband signal of input light through the forward stimulated Brillouin scattering generator, and adjusts the amplitude of the amplified upper sideband signal to be equal to the amplitude of the lower sideband of the input light after the lower sideband is filtered through the band-stop optical filter;the phase modulator is adjusted to shift the phase of the upper sideband of the input light, so that the phase of the upper sideband signal and the phase of the lower sideband signal are different by 180 degrees, and the input light double-sideband amplitude-phase equalization is realized, which improves the stopband suppression degree and the spectral resolution of the band-stop filtering on one hand, and reduces the demand for stimulated Brillouin gain on the other hand, and is more conducive to chip integration.

Description

Technical Field

[0001] This invention relates to the field of optical chip technology, specifically to a double-sided band-phase equalized bandstop filter optical chip based on the SBS effect. Background Technology

[0002] Band-stop filters are crucial functional units in microwave signal processing. Compared to traditional electrical filters, microwave photonic band-stop filters offer advantages such as high stopband rejection, high resolution, and immunity to electromagnetic interference, making them promising for future applications. However, most current microwave photonic band-stop filter solutions are composed of discrete components, resulting in complex structures, large sizes, and difficulties in integration.

[0003] Existing research, such as CN110221455B, "Microwave Photonic Bandpass Filter Chip Based on Stimulated Brillouin Scattering Effect of Silicon Waveguide" (2020-09-15), utilizes the forward stimulated Brillouin scattering effect of the silicon waveguide on the chip to amplify the upper sideband signal of the phase modulator, thereby achieving bandpass filtering. This scheme filters out the pump light signal through a band-stop filter; the center frequency of the band-stop filter determines the pump light frequency. Therefore, this scheme is suitable for amplifying the upper sideband signal using the stimulated Brillouin gain spectrum to achieve bandpass filtering, but it is not easy to implement band-stop filtering functionality. Furthermore, the passband suppression and filtering bandwidth of this scheme depend on the stimulated Brillouin scattering gain spectrum. Due to the small size of the optical chip and the limited pump light power at the coupling port, the stimulated Brillouin scattering gain on the chip is limited, thus restricting further improvements in the passband suppression and filtering bandwidth of this scheme.

[0004] As described above, the existing stimulated Brillouin scattering gain applicable to integrated optical chips is limited, thus restricting some of the chip's performance. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS (stimulated Brillouin scattering) effect, which solves the technical problem of limited gain of stimulated Brillouin scattering applicable to integrated optical chips.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention provides a double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS effect, comprising: a complementary optical filter, a first beam combining module, a forward stimulated Brillouin scattering generator, a phase modulator, a bandstop optical filter, and a second beam combining module;

[0010] The complementary optical filter receives input light and outputs two optical signals. The first optical signal includes the lower sideband of the input light and the optical carrier, and this signal is input into the bandstop filter. The second optical signal includes the upper sideband of the input light, and this signal is input into the first beam combiner module and combined with the pump light to form a single signal, which is then input into the forward stimulated Brillouin scattering generator. The output of the forward stimulated Brillouin scattering generator is phase-shifted by a phase modulator. The output of the phase modulator and the output of the bandstop filter are combined into a single signal by the second beam combiner module to serve as the output light of the double-sideband amplitude-phase equalization bandstop filter optical chip based on the SBS effect.

[0011] The amplitude of the upper sideband of the input light amplified by the forward stimulated Brillouin scattering generator is equal to the amplitude of the lower sideband of the input light after being filtered by the band-blocking filter. The phase modulator shifts the phase of the upper sideband of the light so that the phase of the upper sideband signal is 180 degrees different from that of the lower sideband signal.

[0012] Preferably, the first beam combining module has two input channels, one of which receives the upper sideband f of the input light filtered by the complementary optical filter. c +f s Another channel input pump light f p ; where f c f is the optical carrier frequency. s f is the frequency of the radio frequency signal. p This is the pump light frequency.

[0013] Preferably, the band-blocking filter is a tunable band-blocking filter.

[0014] Preferably, the stopband center frequency of the tunable bandblock filter is f. c -f s The stopband center frequency varies with the frequency f of the RF signal to be filtered. s Adjustments are made to accommodate changes.

[0015] Preferably, the forward stimulated Brillouin scattering generator is a waveguide with forward stimulated Brillouin scattering effect.

[0016] Preferably, the pump light f output by the first beam combining module p After passing through a forward stimulated Brillouin scattering generator, a center frequency of f is generated. p -v B The peak gain coefficient is g B The gain spectrum; where υ B This is the Brillouin frequency shift; achieved by adjusting the pump light frequency f. p Adjust the center frequency of the gain spectrum so that the center frequency f of the gain spectrum is p -v BThe upper sideband frequency f of the input light c +f s same.

[0017] Preferably, the first beam combining module is any one of a beam combiner, a wavelength division multiplexer, or an arrayed waveguide grating.

[0018] Preferably, the second beam combiner module is any one of a beam combiner, a wavelength division multiplexer, or an arrayed waveguide grating.

[0019] (III) Beneficial Effects

[0020] This invention provides a double-sided bandgap amplitude-phase equalization bandstop filter optical chip based on the SBS effect. Compared with the prior art, it has the following advantages:

[0021] The SBS-based double-sided band amplitude-phase equalization bandstop filter optical chip of the present invention includes: a complementary optical filter, a first beam combining module, a forward stimulated Brillouin scattering generator, a phase modulator, a bandstop optical filter, and a second beam combining module.

[0022] The complementary optical filter receives input light and outputs two optical signals. The first optical signal includes the lower sideband of the input light and the optical carrier, and this signal is input into the bandstop filter. The second optical signal includes the upper sideband of the input light, and this signal is input into the first beam combiner module and combined with the pump light to form a single signal, which is then input into the forward stimulated Brillouin scattering generator. The output of the forward stimulated Brillouin scattering generator is phase-shifted by a phase modulator. The output of the phase modulator and the output of the bandstop filter are combined into a single signal by the second beam combiner module to serve as the output light of the double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS effect. This invention amplifies the upper sideband signal of the input light using a forward stimulated Brillouin scattering generator. After amplification, the amplitude of the upper sideband signal is adjusted to be equal to the amplitude of the lower sideband signal after being filtered by a bandstop filter. By adjusting the phase modulator, the upper sideband of the input light is phase-shifted so that the phase of the upper sideband signal differs from that of the lower sideband signal by 180 degrees, achieving amplitude-phase balance of the input light on both sides. This improves the stopband suppression and spectral resolution of the bandstop filter on the one hand, and reduces the demand for stimulated Brillouin gain on the other hand, making it more conducive to chip integration. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a schematic diagram of a double-sided band amplitude-phase equalization bandstop filter optical chip structure based on the SBS effect according to an embodiment of the present invention;

[0025] Figure 2 This is a structural diagram for specific application;

[0026] Figure 3 It is a spectrum diagram of input light, band-blocked filter, and stimulated Brillouin gain;

[0027] Figure 4 This is the output optical spectrum of a double-band amplitude-phase equalization bandstop filter optical chip based on the SBS effect;

[0028] Figure 5 It is a band-stop filtered radio frequency spectrum diagram. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This application provides a double-sideband amplitude-phase equalization bandstop filter optical chip based on the SBS effect, which solves the technical problem of limited stimulated Brillouin scattering gain applicable to integrated optical chips. It achieves double-sideband amplitude-phase equalization of the input light, which can improve the stopband suppression degree and spectral resolution of the bandstop filter on the one hand, and reduce the demand for stimulated Brillouin gain on the other hand, which is beneficial to chip integration.

[0031] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0032] Stimulated Brillouin scattering (SBS) has the advantages of low nonlinear threshold and narrow bandwidth, and is widely used in filtering, spectral analysis, frequency measurement and other fields (e.g., (1) CN103324002B, A reconfigurable single-bandpass microwave photonic filtering system and method, 2016-06-01, (2) CN105865628B, A spectral analysis system and method based on stimulated Brillouin effect, 2017-10-03, (3) CN105910797B, Spectral response measurement method and measuring device of optical devices based on double-sideband modulation and stimulated Brillouin effect, 2 019-04-05, (4)CN104614585B, Multi-frequency high-precision microwave photonic frequency measurement scheme based on stimulated Brillouin effect, 2017-10-24, (5)CN110736876B, Wide-range high-precision microwave frequency measurement method and device based on microwave photonics, 2021-04-30. ) The above application schemes based on the stimulated Brillouin effect excite the stimulated Brillouin effect by inputting high-power pump light into the optical fiber, thereby realizing the amplification or attenuation of the signal or spectrum to be measured, and realizing functions such as spectrum analysis or frequency measurement by changing the pump light frequency. However, the above schemes are based on the back-stimulated Brillouin scattering effect of optical fiber, and generally require multiple devices such as optical amplifiers, optical isolators, and optical circulators, which are not easy to integrate into optical chips. On the other hand, the above-mentioned scheme realizes functions such as spectrum analysis or frequency measurement through the gain spectrum or attenuation spectrum of stimulated Brillouin scattering effect. Since the optical chip is small in size, the stimulated Brillouin gain generated on the chip is small. Therefore, the effect of using only the stimulated Brillouin scattering effect on the chip to perform frequency filtering of radio frequency signals is limited.

[0033] Existing research, such as CN110221455B, Microwave Photonic Bandpass Filter Chip Based on Stimulated Brillouin Scattering Effect of Silicon Waveguide (2020-09-15), is smaller in size and easier to integrate than the aforementioned optical chips that require multiple devices. However, due to the small size of the optical chip and the limited pump light power at the coupling port of the optical chip, the stimulated Brillouin scattering gain on the chip is limited.

[0034] To address the aforementioned issues, embodiments of the present invention propose a double-sided band-phase equalization bandstop filter optical chip based on the SBS effect, suitable for integrated optical chips and reducing the gain requirements of stimulated Brillouin scattering.

[0035] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0036] This invention proposes a double-sideband amplitude-phase equalization bandstop filter optical chip based on the SBS effect, such as... Figure 1As shown, the double-sided band amplitude-phase equalization bandstop filter optical chip includes: a complementary optical filter 1, a first beam combining module 2, a forward stimulated Brillouin scattering generator 3, a phase modulator 4, a bandstop optical filter 5, and a second beam combining module 6.

[0037] The complementary optical filter 1 receives input light and outputs two optical signals. The first optical signal includes the lower sideband of the input light and the optical carrier, and this optical signal is input into the bandstop filter 5. The second optical signal includes the upper sideband of the input light, and this optical signal is input into the first beam combiner 2 and combined with the pump light to enter the forward stimulated Brillouin scattering generator 3. The output of the forward stimulated Brillouin scattering generator 3 is phase-shifted by the phase modulator 4. The output of the phase modulator 4 and the output of the bandstop filter 5 are combined into one by the second beam combiner 6 as the output light of the double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS effect.

[0038] The forward stimulated Brillouin scattering generator 3 amplifies the amplitude of the upper sideband of the input light to be equal to the amplitude of the lower sideband of the input light after being filtered by the band-blocking filter 5. The phase modulator 4 shifts the phase of the upper sideband of the light so that the phase of the upper sideband signal is 180 degrees different from the phase of the lower sideband signal.

[0039] This invention amplifies the upper sideband signal of the input light using a forward stimulated Brillouin scattering generator. The amplitude of the amplified upper sideband signal is adjusted to be equal to the amplitude of the lower sideband signal after filtering by a bandstop filter. The phase of the upper sideband of the input light is shifted by adjusting the phase modulator, so that the phase of the upper sideband signal differs from that of the lower sideband signal by 180 degrees. This achieves phase-amplitude balance of the input light's two sidesbands, improving the stopband suppression and spectral resolution of the bandstop filter while reducing the requirement for stimulated Brillouin gain, thus facilitating chip integration.

[0040] In specific implementation, both the first beam combining module 2 and the second beam combining module 6 can be devices with beam combining functions, such as beam combiners, wavelength division multiplexers, and arrayed waveguide gratings. In this embodiment of the invention, the first beam combining module 2 uses a wavelength division multiplexer, and the second beam combining module 6 uses a beam combiner.

[0041] The complementary optical filter 1 filters the input light and outputs two optical signals, one of which contains the lower sideband f of the input light. c -f s With optical carrier f c The optical signal from one path is input into the band-blocking filter 5; the other path contains the upper sideband f of the input light. c +f s The optical signal from this path is input into wavelength division multiplexer 2. Where, f c f is the optical carrier frequency. sThis refers to the frequency of the radio frequency signal.

[0042] The wavelength division multiplexer 2 has two input channels, one of which receives the upper sideband f of the input light filtered out by the complementary optical filter 1. c +f s Another channel input pump light f p Among them, f p This is the pump light frequency.

[0043] The aforementioned band-blocking filter 5 is a tunable band-blocking filter with a stopband center frequency of f. c -f s The stopband center frequency varies with the frequency f of the signal to be filtered. s The variation can be adjusted; the lower sideband f of the input light filtered by complementary optical filter 1 c -f s The amplitude after filtering with a light-blocking filter 5 is A. F- Phase is

[0044] The forward stimulated Brillouin scattering generator 3 is a waveguide with forward stimulated Brillouin scattering effect, and the pump light f output by the wavelength division multiplexer 2 is... p After passing through the forward stimulated Brillouin scattering generator 3, a center frequency of f is generated. p -υ B The peak gain coefficient is g B The gain spectrum. Where, υ B This is the Brillouin frequency shift. The center frequency f of the gain spectrum. p -υ B The pump light frequency f can be adjusted p Adjustments are made to make the center frequency f of the gain spectrum... p -υ B The upper sideband frequency f of the input light c +f s Same, i.e., f p -v B =f c +f s Due to the stimulated Brillouin scattering effect, the upper sideband signal of the input light output from wavelength division multiplexer 2 is amplified by forward stimulated Brillouin scattering generator 3, and the amplified signal amplitude is A. g+ Phase is

[0045] The forward stimulated Brillouin scattering generator 3 provides an upper sideband f of the input light. c +f s Amplified amplitude A g+ With the lower sideband f of the input light c -f sAmplitude A after filtering with light-blocking filter 5 F- Equal, that is, A g+ =A f- The phase modulator 4 mentioned above pairs the upper sideband f of the light. c +f s The phase shift that occurs is Make This achieves amplitude and phase equalization of the input light on both sides.

[0046] The optical beam combiner 6 combines the output light of the phase modulator 4 with the output light of the band-stop filter 5, thereby combining the upper sideband of the input light, the input optical carrier, and the lower sideband of the input light, and outputting band-stop filtered output light with double-sideband amplitude and phase equalization.

[0047] The following is a detailed description of the double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS effect in conjunction with specific applications.

[0048] like Figure 2 As shown, the output carrier frequency of the signal laser 7 is f. c The optical carrier wave, after passing through an electro-optic modulator, consists of 8 pairs of optically coupled ... s The radio frequency input signal is electro-optically converted, and the resulting input optical spectrum is as follows: Figure 3 As shown in (b), the lower sideband f of the input light c -f s The power is much greater than the upper sideband f c +f s Power. The input light is filtered out by complementary optical filter 1 to extract the upper and lower sidebands. The upper sideband is then band-stopped by band-stop filter 5, and the lower sideband is stimulated Brillouin amplified by forward stimulated Brillouin scattering generator 3. The spectrum of band-stop filter 5 is as follows: Figure 3 As shown in (a) above, the stimulated Brillouin gain spectrum generated by the forward stimulated Brillouin scattering generator 3 is as follows: Figure 3 As shown in (c) above. By adjusting the wavelength of the pump laser 9, the center frequency f of the gain spectrum of the forward stimulated Brillouin scattering generator 3 is changed. p -υ B This makes the center frequency f of the gain spectrum p -υ B The upper sideband frequency f of the input light c +f s Same, i.e., f p -v B =f c +f s This achieves amplification of the upper sideband of the input light. By adjusting the output power of the pump laser 9, the peak gain of the gain spectrum of the forward stimulated Brillouin scattering generator 3 is changed, thus enabling the forward stimulated Brillouin scattering generator 3 to amplify the upper sideband f of the input light. c +fs Amplified amplitude A g+ With the lower sideband f of the input light c -f s Amplitude A after filtering with light-blocking filter 5 F- Equal, that is, A g+ =A F- The phase modulator 4 mentioned above pairs the upper sideband f of the light. c +f s The phase shift that occurs is Make This achieves double-band amplitude and phase equalization of the input light. The output light from phase modulator 4 and the output light from bandstop filter 5 are combined by optical combiner 6 to form the output light spectrum of the optical chip, as shown in the figure. Figure 4 As shown. The upper sideband, carrier, and lower sideband optical field forms of the output light from the optical chip can be represented as follows:

[0049] Above is a light field:

[0050] Optical carrier light field:

[0051] The lower band light field:

[0052] Among them, A c The amplitude of the optical carrier wave. This refers to the phase of the optical carrier.

[0053] The light output from the optical chip undergoes photoelectric conversion via photodetector 10, resulting in an output frequency of f. s The radio frequency signal strength can be expressed as:

[0054]

[0055] When A g+ =A F- and When I = 0, that is, when the double-band amplitude-phase equalization condition is satisfied, the frequency is f. s The RF signal output from the SBS-based double-sideband amplitude-phase equalization band-stop filter optical chip has a signal strength of 0, at which point the stopband suppression of the SBS-based double-sideband amplitude-phase equalization band-stop filter optical chip is at its maximum. The output light from the SBS-based double-sideband amplitude-phase equalization band-stop filter optical chip passes through the photodetector 10 to form a band-stop filtered RF spectrum, as shown below. Figure 5 As shown, by comparing with the spectrum of band-stop filter 5, it can be found that the band-stop suppression degree and spectral resolution of the band-stop filter can be further improved by stimulated Brillouin scattering amplification and bilateral band amplitude-phase equalization.

[0056] In summary, compared with existing technologies, it has the following beneficial effects:

[0057] 1. In this embodiment of the invention, the upper sideband signal of the input light is amplified by a forward stimulated Brillouin scattering generator. The amplitude of the amplified upper sideband signal is adjusted to be equal to the amplitude of the lower sideband signal of the input light after being filtered by a bandstop filter. The phase of the upper sideband of the input light is shifted by adjusting the phase modulator so that the phase of the upper sideband signal is 180 degrees different from that of the lower sideband signal, thereby achieving phase and amplitude balance of the input light on both sides. This improves the stopband suppression and spectral resolution of the bandstop filter on the one hand, and reduces the demand for stimulated Brillouin gain on the other hand, which is more conducive to chip integration.

[0058] 2. In this embodiment of the invention, the upper and lower sidebands of the input light are separated by a complementary optical filter, and the upper and lower sidebands are modulated separately. Since the optical chip is small, the upper and lower sidebands are in phase due to environmental factors such as temperature and vibration. Therefore, after the upper and lower sidebands are combined by the optical combiner, the phase effects caused by environmental changes cancel each other out and do not affect the phase of the output light of the band-stop filter.

[0059] 3. In this embodiment of the invention, the upper sideband signal of the input light is amplified by a forward stimulated Brillouin scattering generator, which can reduce the power requirement of the upper sideband signal of the input light for double-sideband amplitude-phase equalization. Therefore, the input light can be generated by a modulation method in which the lower sideband signal power is much greater than the upper sideband signal power. After the upper and lower sidebands are combined by the optical combiner, the output light power can be increased, which further improves the signal-to-noise ratio of the band-stop filter detection.

[0060] 4. In this embodiment of the invention, the lower sideband signal is band-stop filtered by a band-stop filter. On the one hand, this can improve the output light band-stop suppression. On the other hand, after the band-stop filter, the amplitude of the lower sideband signal is reduced, which can reduce the demand of the double-sideband amplitude-phase equalization on the stimulated Brillouin gain and the power of the upper sideband signal.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-sided band-span equalization bandstop filter optical chip based on the SBS effect, characterized in that, include: Complementary optical filter, first beam combining module, forward stimulated Brillouin scattering generator, phase modulator, band-blocking filter and second beam combining module; The complementary optical filter receives input light and outputs two optical signals. The first optical signal includes the lower sideband of the input light and the optical carrier. This optical signal is input into the band-blocking filter. The second optical signal includes the upper sideband of the input light. This optical signal is input into the first beam combiner module and combined with the pump light into one beam. The two beams are then input into the forward stimulated Brillouin scattering generator. The output of the forward stimulated Brillouin scattering generator is phase-shifted by a phase modulator. The output of the phase modulator and the output of the bandstop filter are combined into one beam by the second beam combiner module to serve as the output light of the double-sideband amplitude-phase equalization bandstop filter optical chip based on the SBS effect. The amplitude of the upper sideband of the input light amplified by the forward stimulated Brillouin scattering generator is equal to the amplitude of the lower sideband of the input light after being filtered by the band-blocking filter. The phase modulator shifts the phase of the upper sideband of the light so that the phase of the upper sideband signal is 180 degrees different from that of the lower sideband signal.

2. The double-sided band-span equalization bandstop filter optical chip based on the SBS effect as described in claim 1, characterized in that, The first beam combining module has two input channels, one of which receives the upper sideband of the input light filtered by the complementary optical filter. Another channel inputs pump light ;in, For optical carrier frequency, For radio frequency signal frequency, This is the pump light frequency.

3. The double-sided band-span amplitude-phase equalization band-stop filter optical chip based on the SBS effect as described in claim 2, characterized in that, The band-blocking filter is a tunable band-blocking filter.

4. The double-sided band amplitude-phase equalization bandstop filter optical chip based on the SBS effect as described in claim 3, characterized in that, The stopband center frequency of the tunable band light-blocking filter is The stopband center frequency varies with the frequency of the RF signal to be filtered. Adjustments are made to accommodate changes.

5. The double-sided band-span equalization bandstop filter optical chip based on the SBS effect as described in any one of claims 1 to 4, characterized in that, The aforementioned forward stimulated Brillouin scattering generator is a waveguide with forward stimulated Brillouin scattering effect.

6. The double-sided band-span amplitude-phase equalization bandstop filter optical chip based on the SBS effect as described in any one of claims 2 to 4, characterized in that, Pump light output from the first beam combining module After passing through a forward stimulated Brillouin scattering generator, a center frequency of [value missing] is generated. The peak gain coefficient is The gain spectrum; where, This is the Brillouin frequency shift; achieved by adjusting the pump light frequency. Adjust the center frequency of the gain spectrum so that the center frequency of the gain spectrum is With the upper sideband frequency of the input light same.

7. The double-sided band-span equalization bandstop filter optical chip based on the SBS effect as described in any one of claims 1 to 4, characterized in that, The first beam combining module is any one of a beam combiner, a wavelength division multiplexer, or an arrayed waveguide grating.

8. The double-sided band-span equalization bandstop filter optical chip based on the SBS effect as described in any one of claims 1 to 4, characterized in that, The second beam combiner module is any one of a beam combiner, a wavelength division multiplexer, or an arrayed waveguide grating.

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