CN114614905B - Multi-octave bandwidth MPL linearization acquisition receiving chip based on spectrum shaping - Google Patents
Multi-octave bandwidth MPL linearization acquisition receiving chip based on spectrum shaping Download PDFInfo
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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Abstract
The invention discloses a multi-octave bandwidth MPL linearization acquisition receiving chip based on spectrum shaping, which consists of a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator, two paths of parallel reconfigurable micro-ring resonators and an adjustable phase shifter; the microwave signal is modulated by the electro-optical modulator and connected into the 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator, the microwave signal is output in two paths and is respectively connected with a micro-ring resonator, one path of the microwave signal is connected into the balance detector after the delay difference compensation is carried out by the adjustable phase shifter, so that the second-order nonlinear distortion and the third-order nonlinear distortion are simultaneously restrained, and the high-linearity microwave photon link with multiple octaves bandwidth is obtained. The invention has the advantages of simple and flexible implementation, multi-octave working bandwidth and the like, and has important application in wideband microwave signal analog optical transmission and other systems.
Description
Technical Field
The invention belongs to the technical field of microwave photons, relates to the fields of photon integration, optical carrier radio frequency transmission and the like, and particularly relates to a multi-octave bandwidth microwave photon link MPL linearization acquisition receiving chip based on spectrum shaping.
Background
Along with the rapid evolution of information technology, multi-band, multi-system, multi-service, multi-function, multi-platform and multi-scene fusion systems with heterogeneous characteristics and networks become the necessary development trend of infrastructure construction in the fields of future military and civil communication, radar, electronic warfare and the like, and comprise an air-ground integrated information network, a 5G/B5G/6G (ultra-dense heterogeneous network), a detection/interference/detection/communication integrated electronic system and the like. The construction of the integrated system and the heterogeneous network is required to be compatible with multi-source heterogeneous signals with various different frequency bands, power, systems and modulation formats, and meanwhile, flexible real-time switching of different functional signals is required to be realized rapidly aiming at different application scenes. Therefore, signal processing and transmission techniques that meet the requirements of large bandwidth, large dynamic range and dynamic reconfigurability are key challenges for further development of integrated systems, heterogeneous networks. However, the conventional electronic technology is limited by the "electronic bottleneck" problems of narrow bandwidth, electromagnetic compatibility tolerance, large transmission loss, low processing speed and the like, and is difficult to realize parallel flexible processing and transmission of broadband multi-band signals. The rapid rise and maturation of the microwave photon technology provides a brand new and effective solution to the problems. The microwave photon system uses the functions of microwave and light wave mutual conversion of a Microwave Photon Link (MPL) and light-carried microwave signal transmission as support, and utilizes photonics devices or technologies to realize transmission, processing, perception and the like of high-frequency and broadband microwave signals, and has the characteristics of wide spectrum coverage, large instantaneous bandwidth, low transmission loss, electromagnetic interference resistance and the like.
However, an integrated system, heterogeneous network will have extremely stringent (spurious-free) dynamic range index requirements to be compatible with a variety of different frequency band, power and type of signals. Limited by the intrinsic analog transmission scheme, the problem of limited dynamic range caused by the inherent nonlinearity of MPL will become one of the key challenges faced by microwave photon technology in the above-mentioned system and network applications. At present, the existing MPL linearization method mainly depends on commercial high-performance discrete components to implement MPL linearization, and faces practical application challenges such as volume, power consumption, stability, cost and the like. With the rapid development and maturation of microwave photon integration technology, MPL links based on integrated spectral shaping have been attracting attention, for example, researchers in netherlands Wen Teda have begun to study large dynamic MPL based on integrated spectral shaping devices, link third-order intermodulation distortion can be suppressed to more than 22dB based on phase modulation, and sfdr reaches 107db·hz 2/3 (G.J.Liu, O.Daulay, Y.Klaver, R.Botter, Q.G.Tan, H.X.Yu, M.Hoekman, E.J.Klein, and D.Marpaung "Integrated Microwave Photonic Spectral Shaping for Linearization and Spurious-Free Dynamic Range Enhancement," Journal of Lightwave Technology,39 (24): 7551-7562, 2021.). However, this approach is still limited to a specific modulation format and can only solve the problem of third order nonlinear distortion, thus not being suitable for wideband (multi-octave) system applications.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-octave bandwidth microwave photon link MPL linearization acquisition receiving chip based on spectrum shaping.
The invention relates to a multi-octave bandwidth MPL linearization acquisition receiving chip based on spectrum shaping, which consists of a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator, two paths of parallel reconfigurable micro-ring resonators and a first adjustable phase shifter.
The microwave signal is modulated by the electro-optical modulator and connected into the 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator, and two paths of outputs are respectively connected with a micro-ring resonator: the narrow-band-stop transmission spectrum of one micro-ring resonator is used for filtering out the optical carrier wave of the microwave modulation optical signal, so that the micro-ring resonator only generates a second-order nonlinear distortion signal after photoelectric conversion; the band-stop transmission spectrum and the frequency selective phase shift characteristic of the other micro-ring resonator are used for carrying out narrow-band amplitude and phase regulation on the spectrum near the optical carrier wave so as to ensure that second-order nonlinear distortion and fundamental frequency signals are reserved while suppressing third-order nonlinear distortion after photoelectric conversion of the micro-ring resonator; one of the two paths of optical signals is connected to a balance detector after the delay difference compensation is carried out by a first adjustable phase shifter, so that the simultaneous suppression of second-order nonlinear distortion and third-order nonlinear distortion is realized, and a high-linearity microwave photon link with multiple octaves of bandwidth is obtained.
Furthermore, the 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator consists of two-side multimode interference couplers and two paths of straight arm waveguides, wherein one arm is provided with a second adjustable phase shifter based on a thermo-optical effect; the amplitude ratio of two paths of output light waves of the right side multimode interference coupler is dynamically adjusted through adjusting the second adjustable phase shifter, so that the amplitude matching of two paths of output light signals is realized.
Further, the micro-ring resonator consists of a 2×2 Mach-Zehnder interferometer type adjustable optical attenuator, an optical feedback loop and an in-ring adjustable phase shifter; the 2X 2 Mach-Zehnder interferometer type adjustable optical attenuator dynamically regulates and controls the coupling coefficient between the annular waveguide and the bus waveguide, the in-loop adjustable phase shifter dynamically adjusts the phase shift of the annular waveguide, and finally the dynamic reconfiguration of the micro-loop resonator amplitude and phase transmission spectrum is realized.
The beneficial technical effects of the invention are as follows:
1. the invention provides a novel spectrum shaping-based microwave photon link linearization acquisition receiving method, which can realize simultaneous suppression of second-order nonlinear distortion and third-order nonlinear distortion of a link and obtain a high-linearity microwave photon link with multi-octave working bandwidth.
2. The invention provides a novel spectrum shaping acquisition receiving chip architecture, and provides the functions of precise amplitude, phase matching and regulation of different paths of a reconfigurable optical domain required by linearization of a multi-octave bandwidth microwave photon link.
Drawings
Fig. 1 is a schematic diagram of a multi-octave bandwidth MPL linearization acquisition receiving chip based on spectral shaping.
Fig. 2 is a block diagram of a 1×2 mach-zehnder interferometer type tunable optical attenuator.
Fig. 3 is a structural diagram of a micro-ring resonator.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and the detailed description.
The invention discloses a spectral shaping-based multi-octave bandwidth MPL linearization acquisition receiving chip, which is shown in figure 1, and consists of a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator 201, two paths of parallel reconfigurable micro-ring resonators 202 and a first adjustable phase shifter 203. The chip uses on-chip reconfigurable different path widths, matched and regulated devices to shape the spectrum modulated by microwaves, simultaneously suppresses second-order and third-order nonlinear distortion of links, and realizes multi-octave working bandwidth.
The microwave signal is modulated by the electro-optical modulator 10, is connected to the 1×2 Mach-Zehnder interferometer type adjustable optical attenuator 201, is output in two ways, and is respectively connected with one micro-ring resonator 202: the narrow-band-stop transmission spectrum of one micro-ring resonator 202 is used for filtering out the optical carrier wave of the microwave modulation optical signal, so that the path ensures that only second-order nonlinear distortion signals are generated after photoelectric conversion; the band-stop transmission spectrum and the frequency selective phase shift characteristic of the other micro-ring resonator 202 are used for carrying out narrow-band amplitude and phase regulation on the spectrum near the optical carrier wave so as to ensure that the second-order nonlinear distortion and the fundamental frequency signal are reserved while the third-order nonlinear distortion is restrained after the photoelectric conversion of the micro-ring resonator 202; after one of the two paths of optical signals is subjected to time delay difference compensation through the first adjustable phase shifter 203, the optical signals are connected into the balance detector 30, the mutual cancellation of the second-order nonlinear distortion of the two paths of signals is realized by utilizing the balance detection principle, the simultaneous suppression of the second-order nonlinear distortion and the third-order nonlinear distortion is realized, and the high-linearity microwave photon link with multiple octaves bandwidth is obtained.
Further, as shown in fig. 2, the 1×2 mach-zehnder interferometer type tunable optical attenuator 201 is composed of two side multimode interference couplers 2011, 2013 and two straight arm waveguides, wherein one arm is provided with a second tunable phase shifter 2012 based on thermo-optical effect; the amplitude ratio of the two paths of output light waves of the right side multimode interference coupler 2013 is dynamically adjusted by adjusting the second adjustable phase shifter 2012, so that the amplitude matching of the two paths of output light signals is realized.
Further, as shown in fig. 3, the micro-ring resonator 202 is composed of a 2×2 mach-zehnder interferometer type tunable optical attenuator 2021, an optical feedback loop, and an in-ring tunable phase shifter 2022; the 2×2 mach-zehnder interferometer type adjustable optical attenuator 2021 dynamically adjusts and controls the coupling coefficient between the annular waveguide and the bus waveguide, the in-loop adjustable phase shifter 2022 dynamically adjusts the phase shift of the annular waveguide, and finally, the dynamic reconfiguration of the micro-loop resonator amplitude and phase transmission spectrum is realized, and the key narrowband amplitude and phase adjusting function is supported.
The invention has the following characteristics: 1) Based on serial and parallel combination of unit devices such as a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator, a micro-ring resonator, an adjustable phase shifter and the like, different path widths, phase matching and regulation and control of a broadband and reconfigurable optical domain are implemented; 2) And performing simultaneous suppression of second-order nonlinear distortion and third-order nonlinear distortion of the microwave photon link based on spectrum shaping to obtain the high-linearity microwave photon link with multi-octave working bandwidth.
Claims (1)
1. The multi-octave bandwidth MPL linearization acquisition receiving chip based on spectrum shaping is characterized by comprising a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator (201), two paths of parallel reconfigurable micro-ring resonators (202) and a first adjustable shifter (203);
the microwave signal is modulated by an electro-optical modulator (10) and is connected into a 1X 2 Mach-Zehnder interferometer type adjustable optical attenuator (201), and two paths of outputs are respectively connected with a micro-ring resonator (202): the narrow-band-reject transmission spectrum of one micro-ring resonator (202) is used for filtering out the optical carrier wave of the microwave modulation optical signal, so that the micro-ring resonator only generates a second-order nonlinear distortion signal after photoelectric conversion; the band-stop transmission spectrum and the frequency selective phase shift characteristic of the other micro-ring resonator (202) are used for carrying out narrow-band amplitude and phase regulation on the spectrum near the optical carrier, so that the second-order nonlinear distortion and the fundamental frequency signal are reserved while the third-order nonlinear distortion is restrained after the photoelectric conversion of the micro-ring resonator; one of the two paths of optical signals is connected to a balance detector (30) after the delay difference compensation is carried out by a first adjustable phase shifter (203), so that the simultaneous suppression of second-order nonlinear distortion and third-order nonlinear distortion is realized, and a high-linearity microwave photon link with multiple octave bandwidths is obtained;
the 1×2 Mach-Zehnder interferometer type adjustable optical attenuator (201) is composed of a left side multimode interference coupler (2011) and a right side multimode interference coupler (2013), wherein the left side multimode interference coupler (2011) and the right side multimode interference coupler (2013) are connected through two paths of straight arm waveguides, and one arm is provided with a second adjustable phase shifter (2012) based on a thermo-optical effect; the amplitude ratio of two paths of output light waves of the right side multimode interference coupler (2013) is dynamically adjusted through adjusting the second adjustable phase shifter (2012), so that the amplitude matching of the two paths of output light signals is realized;
the micro-ring resonator (202) consists of a 2X 2 Mach-Zehnder interferometer type adjustable optical attenuator (2021) and an in-ring adjustable phase shifter (2022), and the 2X 2 Mach-Zehnder interferometer type adjustable optical attenuator (2021) and the in-ring adjustable phase shifter (2022) are connected by a ring waveguide to form an optical feedback loop; the 2X 2 Mach-Zehnder interferometer type adjustable optical attenuator (2021) dynamically regulates and controls the coupling coefficient between the annular waveguide and the bus waveguide, and the in-loop adjustable phase shifter (2022) dynamically adjusts the phase shift of the annular waveguide, so that the dynamic reconfiguration of the micro-loop resonator amplitude and phase transmission spectrum is finally realized.
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| CN103064199A (en) * | 2012-12-10 | 2013-04-24 | 上海交通大学 | Reflection-type adjustable light delay line |
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