Photon number-modulated conversion apparatus and method with noise shaping encoding and optical time interleaving

Abstract

The application relates to the technical field of signal generation, in particular to a photon digital-to-analog conversion device and method based on noise shaping coding and optical time interleaving, wherein the device comprises a noise shaping digital signal generation module, an optical short pulse generation module, an optical time interleaving module, an electro-optical modulation module and a photoelectric conversion module; the noise shaping digital signal generation module is used for generating a noise shaping digital signal; the optical short pulse generation module is used for generating optical short pulses; the optical time interleaving module is used for generating a time-interleaved optical pulse source by using the optical short pulses; the electro-optical modulation module is used for modulating the noise shaping digital signal on the time-interleaved optical pulse source to generate multiple time-interleaved modulated optical signals; the multiple time-interleaved modulated optical signals are combined into one modulated optical signal by the multiple synthesis module; and the photoelectric conversion module is used for photoelectrically converting and filtering the one modulated optical signal to obtain an electrical domain signal. The device can effectively utilize the low jitter characteristic and narrow pulse width characteristic of optical sampling pulses, realize multiple time interleaving, and further realize high sampling rate digital-to-analog conversion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal generation, in particular to a photon digital-to-analog conversion device and method based on noise shaping coding and optical time interleaving. BACKGROUND

[0002] In future high-data-rate wireless communication systems, high-resolution radars and other applications, the demand for higher data rates and larger bandwidth signals is increasing, and as the core of the signal generation module, DAC (Digital to Analog Converter) is also developing towards high sampling rate and high effective bit.

[0003] Due to the electronic bottleneck, the performance of the current electronic-based DAC is difficult to improve. For example, in the current widely used current steering structure CMOS (Complementary Metal Oxide Semiconductor) DAC, there are problems such as multi-channel matching, thermal noise and charge influence, and the improvement of effective bit is limited. In terms of bandwidth improvement of DAC, the current main technologies are based on AMUX (analog multiplexing) and time interleaving to synthesize high-speed signals, but due to the problem of sampling clock jitter, the improvement of multiplexing channel number is also difficult.

[0004] In addition, in the electronic DAC, there are studies using noise shaping technology based on ΔΣ modulation to generate high effective bit signals. The main principle of this technology is to use a ΔΣ modulator to convert the ideal signal waveform to be output into a low-bit data stream. The ΔΣ modulation process moves the quantization noise from the useful frequency band to the useless frequency band, ensuring that the noise in the useful frequency band is low, and the useful frequency band can be filtered out through a filter, thereby realizing high effective bit signal generation. However, when using ΔΣ modulation technology to generate signals, the system is usually required to have a high oversampling rate, that is, the digital signal rate of the DAC needs to be higher than the Nyquist sampling rate, therefore, the existing electronic-based ΔΣ modulation DAC has the problem of limited signal bandwidth.

[0005] Signal generation based on photon technology is considered an important method to solve the electronic bottleneck. In existing literature reports, the maximum equivalent sampling rate that a photon DAC can achieve is less than 50GS / s, and the effective bit is less than 5, which is difficult to meet the current demand for large bandwidth and high effective bit signal generation. SUMMARY

[0006] The present application provides a photon digital-to-analog conversion device and method based on noise shaping coding and optical time interleaving, an electronic device and a storage medium to solve the problems of low signal sampling rate and low effective bit in related art optical digital-to-analog conversion technology.

[0007] The first aspect of the present application provides a photon digital-to-analog conversion device with noise shaping coding and optical time interleaving, comprising: a noise shaping digital signal generation module, configured to generate a noise shaping digital signal; an optical short pulse generation module, configured to generate optical short pulses; an optical time interleaving module, configured to generate a time-interleaved optical pulse source using the optical short pulses; an electro-optical modulation module, configured to modulate the noise shaping digital signal on the time-interleaved optical pulse source to generate a plurality of time-interleaved modulated optical signals; a multi-channel synthesis module, configured to combine the plurality of time-interleaved modulated optical signals into one modulated optical signal; and an opto-electric conversion module, configured to perform opto-electric conversion and filtering on the one modulated optical signal to obtain an electrical domain signal.

[0008] In the embodiments of the present application, the noise shaping digital signal generation module comprises: a noise shaping coding unit, configured to generate a noise shaping coded digital signal; and a multiplexing digital signal generation unit, configured to perform multiplexing coding on the digital signal to generate the noise shaping digital signal.

[0009] In the embodiments of the present application, the optical short pulse generation module comprises: a multi-wavelength light source array, having a plurality of light sources; a first wavelength division multiplexing unit, comprising a 1×N first wavelength division multiplexer, each branch of the 1×N first wavelength division multiplexer corresponding to an optical wavelength corresponding to each channel of the multi-wavelength light source array, so as to combine signals of different wavelength light sources into one channel to obtain a wavelength division multiplexed optical signal; and a pulse generation unit, configured to modulate the wavelength division multiplexed optical signal to generate multi-wavelength optical pulses and perform time compression on the multi-wavelength optical pulses.

[0010] In the embodiments of the present application, the optical time interleaving module comprises: a wavelength division demultiplexing unit, comprising a 1×N wavelength division demultiplexer, so as to divide the multi-wavelength optical short pulses into N channels, wherein each channel comprises optical short pulses of a single wavelength; and a wavelength-time interleaving unit, configured to apply a delay to the N channels of optical short pulses of a single wavelength.

[0011] In the embodiments of the present application, the optical short pulse generation module comprises: a mode-locked laser, configured to generate optical pulses and perform time compression on the optical pulses.

[0012] In the embodiments of the present application, the optical time interleaving module comprises: an optical coupler, configured to divide an output signal of the mode-locked laser into N channels to obtain N channels of optical short pulses; and a time interleaving unit, configured to apply a delay to the N channels of optical short pulses.

[0013] In the embodiment of the present application, the electro-optical modulation module comprises a modulator array, and the modulator array comprises N modulators.

[0014] In the embodiment of the present application, the multi-channel synthesis module comprises a second wavelength division multiplexing unit, and the second wavelength division multiplexing module comprises a 1xN second wavelength division multiplexer, each branch of the 1xN second wavelength division multiplexer corresponding to an optical wavelength of each channel of the optical source array, so as to combine the modulated optical signals of different wavelengths into one channel to obtain one modulated optical signal after time interleaving.

[0015] In the embodiment of the present application, the multi-channel synthesis module comprises an optical coupling unit, which is used to combine N modulated optical signals into one channel to obtain one modulated optical signal after time interleaving.

[0016] In the embodiment of the present application, the photoelectric conversion module comprises a photodetector and a filter, which are used to perform photoelectric conversion and analog filtering on the one modulated optical signal to obtain an electrical domain signal.

[0017] The second aspect embodiment of the present application provides a photon digital-to-analog conversion method based on noise shaping coding and optical time interleaving, comprising the following steps: generating a noise shaping digital signal and an optical short pulse, using the optical short pulse to generate a time-interleaved optical pulse source; modulating the noise shaping digital signal on the time-interleaved optical pulse source to generate a plurality of time-interleaved modulated optical signals; combining the plurality of time-interleaved modulated optical signals into one modulated optical signal, and performing photoelectric conversion and filtering on the one modulated optical signal to obtain an electrical domain signal.

[0018] The third aspect embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the photon digital-to-analog conversion method based on noise shaping coding and optical time interleaving as described in the above embodiments.

[0019] The fourth aspect embodiment of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the photon digital-to-analog conversion method based on noise shaping coding and optical time interleaving as described above.

[0020] The embodiments of the present application have at least the following beneficial effects:

[0021] The low-jitter characteristic and narrow pulse width characteristic of the optical sampling pulse can be effectively utilized to realize multi-path time interleaving, and then realize high sampling rate digital-to-analog conversion. Meanwhile, by using this high sampling rate digital-to-analog conversion structure, the advantages of the noise shaping technology based on ΔΣ modulation in generating low-band noise signals can be fully utilized. The noise shaping digital signal generation technology is combined with high-frequency and large-bandwidth signal generation, and can be applied in radar, wireless communication, arbitrary waveform generation and other scenes.

[0022] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A structure schematic diagram of a noise shaping encoding and optical time interleaving photonic digital-to-analog conversion device according to an embodiment of the present application;

[0025] Figure 2 A structure schematic diagram of a noise shaping encoding and optical time interleaving photonic digital-to-analog conversion device according to an embodiment of the present application;

[0026] Figure 3 A structure schematic diagram of a noise shaping encoding and optical time interleaving photonic digital-to-analog conversion device according to an embodiment of the present application;

[0027] Figure 4 A structure schematic diagram of a noise shaping encoding and optical time interleaving photonic digital-to-analog conversion device according to an embodiment of the present application;

[0028] Figure 5 A simulation result schematic diagram of a 35-45G linear frequency modulation signal with a sampling rate of 100GS / s generated by time interleaving of a 4-path 25Gb / s digital signal according to an embodiment of the present application;

[0029] Figure 6 A structure schematic diagram of a noise shaping encoding and optical time interleaving photonic digital-to-analog conversion device according to an embodiment of the present application;

[0030] Figure 7 An electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below in detail with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] The photon digital-to-analog conversion device, method, electronic device and storage medium of noise shaping coding and optical time interleaving according to the embodiments of the present application are described below with reference to the accompanying drawings. In view of the low signal sampling rate and low effective bit of the optical digital-to-analog conversion technology mentioned in the background art, the present application provides a photon digital-to-analog conversion device of noise shaping coding and optical time interleaving, in which the low jitter characteristic and narrow pulse width characteristic of the optical sampling pulse can be effectively utilized to realize multi-path time interleaving and high sampling rate digital-to-analog conversion. At the same time, the advantages of the noise shaping technology based on ΔΣ modulation in generating low in-band noise signals can be fully utilized by using this high sampling rate digital-to-analog conversion structure, and the noise shaping digital signal generation technology can be combined with high frequency and large bandwidth signal generation, which can be applied in radar, wireless communication, arbitrary waveform generation and other scenarios. Thus, the problems of low signal sampling rate and low effective bit in the related art optical digital-to-analog conversion technology are solved.

[0033] Specifically, Figure 1 A structure diagram of a photon digital-to-analog conversion device of noise shaping coding and optical time interleaving according to an embodiment of the present application is shown.

[0034] As Figure 1 shown, the photon digital-to-analog conversion device of noise shaping coding and optical time interleaving 10 includes a noise shaping digital signal generation module 100, an optical short pulse generation module 200, an optical time interleaving module 300, an electro-optical modulation module 400, a multi-path synthesis module 500 and an optoelectronic conversion module 600.

[0035] The noise shaping digital signal generation module 100 is configured to generate a noise shaping digital signal. The optical short pulse generation module 200 is configured to generate an optical short pulse. The optical time interleaving module 300 is configured to generate a time interleaved optical pulse source using the optical short pulse. The electro-optical modulation module 400 is configured to modulate the noise shaping digital signal on the time interleaved optical pulse source to generate a multi-path time interleaved modulated optical signal. The multi-path synthesis module 500 is configured to combine the multi-path time interleaved modulated optical signal into one modulated optical signal. The optoelectronic conversion module 600 is configured to perform optoelectronic conversion and filtering on the one modulated optical signal to obtain an electrical domain signal.

[0036] In the embodiment of the present application, the output end of the optical short pulse generation module is connected to the input end of the optical time interleaving module, for generating optical short pulses and inputting the optical short pulses into the optical time interleaving module. The output end of the optical time interleaving module is connected to the optical input end of the electro-optical modulation module, as the light source of the electro-optical modulation module. The output end of the noise shaping digital signal generation module is connected to the microwave input end of the electro-optical modulation module, for generating noise shaping digital signals. The output end of the electro-optical modulation module is connected to the input end of the multiplexing module, for modulating the noise shaping digital signals on the time interleaved optical pulse source. The output end of the multiplexing module is connected to the input end of the photoelectric conversion module, for merging the multiplexed time interleaved modulated optical signals into one. The photoelectric conversion module is used for photoelectric conversion and filtering of the time interleaved modulated optical signals, to obtain an electrical domain signal.

[0037] The noise shaping encoding and optical time interleaving photon digital-to-analog conversion device of the embodiment of the present application generates digital signals based on a noise shaping encoding mode, and realizes high sampling rate signal generation based on an optical time interleaving principle, can simultaneously realize high effective bit and high sampling rate photon digital-to-analog conversion, and further can realize high frequency and large bandwidth microwave photon arbitrary waveform generation.

[0038] In the embodiment of the present application, the noise shaping digital signal generation module comprises: a noise shaping encoding unit, for generating noise shaping encoded digital signals; a multiplexing digital signal generation unit, for multiplexing encoding the digital signals to generate noise shaping digital signals.

[0039] Specifically, the output end of the noise shaping encoding unit is connected to the input end of the multiplexing digital signal generation unit, and the output end of the multiplexing digital signal generation unit is connected to the microwave input end of the modulator array. The noise shaping encoding unit is used for generating noise shaping encoded digital signals, and the code rate of the digital signals is f S , that is, the sampling rate of the photon digital-to-analog converter. The multiplexing digital signal generation unit is used for multiplexing encoding the noise shaping encoded digital signals with the code rate of f S , to obtain N-channel digital signals with the code rate of f S / N, wherein N represents the number of channels of the optical time interleaving.

[0040] In the embodiment of the present application, the optical short pulse generation module comprises: a multi-wavelength light source array, the multi-wavelength light source array having a plurality of light sources; a first wavelength division multiplexing unit, the first wavelength division multiplexing unit comprising a 1×N first wavelength division multiplexer, each branch of the 1×N first wavelength division multiplexer corresponding to an optical wavelength corresponding to each channel of the multi-wavelength light source array, so as to merge the signals of different wavelength light sources into one, to obtain wavelength division multiplexed optical signals; and a pulse generation unit, for modulating the wavelength division multiplexed optical signals, generating multi-wavelength optical pulses, and time compressing the multi-wavelength optical pulses.

[0041] Specifically, the output end of the multi-wavelength light source array is connected to the input end of the wavelength division multiplexing module, and the output end of the first wavelength division multiplexing unit is connected to the input end of the pulse generation unit; the multi-wavelength light source array comprises N light sources; the first wavelength division multiplexing unit comprises a 1xN wavelength division multiplexer, and each branch corresponds to a wavelength of the multi-wavelength light source array, so that signals of different wavelength light sources are combined into one branch; the pulse generation unit is used for modulating the light signal comprising N wavelengths after wavelength division multiplexing, generating multi-wavelength light pulses, and time compressing the light pulses to avoid inter-pulse interference after time interleaving.

[0042] In the embodiment of the present application, the optical short pulse generation module comprises: a mode-locked laser, which is used for generating optical pulses and time compressing the optical pulses.

[0043] Further, the optical short pulse generation module can be a mode-locked laser, and the output end of the mode-locked laser is connected to the input end of the optical time interleaving module, which is used for generating optical pulses with a repetition frequency of f S / N and time compressing the optical pulses to avoid inter-pulse interference after time interleaving.

[0044] In the embodiment of the present application, the optical time interleaving module comprises: a wavelength division demultiplexing unit, which comprises a 1xN wavelength division demultiplexer, so as to divide the multi-wavelength optical short pulses into N branches, wherein each branch comprises optical short pulses with a single wavelength; and a wavelength-time interleaving unit, which is used for applying a delay to the N branches of optical short pulses with a single wavelength.

[0045] Specifically, the output end of the wavelength division demultiplexing unit is connected to the optical input end of the wavelength-time interleaving unit, and the output end of the wavelength-time interleaving unit is connected to the optical input end of the modulator array; the wavelength division demultiplexing unit comprises a 1xN wavelength division demultiplexer, so as to divide the multi-wavelength optical short pulses output by the pulse generation unit into N branches, each branch comprising optical short pulses with a single wavelength; the output end of the wavelength-time interleaving unit is connected to the input end of the modulator array in the electro-optical modulation unit, which is used for applying a delay to the N branches of optical short pulses with a single wavelength, so that the delay of the i(i>1) branch compared with the first branch is Δt i =1 / f S *(i-1+k*N), wherein f S represents the sampling rate of the photonic digital-to-analog converter, N represents the number of channels of the optical time interleaving, and k is an integer.

[0046] In the embodiment of the present application, the optical time interleaving module comprises: an optical coupler, which is used for dividing the output signal of the mode-locked laser into N branches to obtain N branches of optical short pulses; and a time interleaving unit, which is used for applying a delay to the N branches of optical short pulses.

[0047] Specifically, the optical time interleaving module comprises an optical coupler and a time interleaving unit. An input end of the optical coupler is connected to an output end of the mode-locked laser, and an output end of the optical coupler is connected to an input end of the time interleaving unit; the optical coupler is used for splitting the output signal of the mode-locked laser into N paths; an output end of the time interleaving unit is connected to an input end of a modulator array in the electro-optical modulation module, and is used for applying a delay to the N paths of optical short pulses, so that the i (i>1) path is delayed by Δt i =1 / f S *(i-1+k*N), where f S represents the sampling rate of the photonic digital-to-analog converter, N represents the number of channels of the optical time interleaving, and k is an integer.

[0048] In the embodiment of the present application, the electro-optical modulation module comprises: a modulator array, and the modulator array comprises N modulators.

[0049] Specifically, the modulator array comprises N modulators, the i (1≤i≤N) path output of the time interleaving module is injected into the i (1≤i≤N) path modulator in the modulator array respectively, and the i (1≤i≤N) path digital signal D i is used for modulating the i (1≤i≤N) path modulator in the modulator array, so that the output of the modulator array is N optical binary signals.

[0050] In the embodiment of the present application, the multi-path synthesis module comprises: a second wavelength division multiplexing unit, and the second wavelength division multiplexing module comprises a 1×N second wavelength division multiplexer, each branch of the 1×N second wavelength division multiplexer corresponds to each path of the light source array, so as to combine the modulated light signals of different wavelengths into one path, thereby obtaining one modulated light signal after time interleaving.

[0051] The second wavelength division multiplexing unit comprises a 1×N wavelength division multiplexer, and each branch of the 1×N wavelength division multiplexer corresponds to each path of the light source array, so as to combine the modulated light signals of different wavelengths into one path, thereby obtaining the optical carrier signal after time interleaving.

[0052] In the embodiment of the present application, the multi-path synthesis module can also comprise an optical coupling unit. The optical coupling unit is used for combining the N modulated optical carrier signals into one path, thereby obtaining the optical carrier signal after time interleaving.

[0053] In the embodiment of the present application, the photoelectric conversion module comprises: a photodetector and a filter, which are used for photoelectrically converting the modulated light signal and performing analog filtering, thereby obtaining an electrical domain signal.

[0054] Specifically, the photoelectric conversion module comprises a photodetector and a filter, which are used for photoelectrically converting the modulated light signal after time interleaving and performing analog filtering, thereby obtaining an electrical domain signal, i.e., the output of the photonic digital-to-analog converter.

[0055] The following detailed description of the noise shaping coding and optical time-interleaved photonic digital-to-analog converter of this application is provided through specific embodiments.

[0056] like Figure 2 As shown, the photonic digital-to-analog converter with noise shaping coding and optical time interleaving includes: a noise shaping digital signal generation module, an optical short pulse generation module, an optical time interleaving module, an electro-optic modulation module, a multi-channel synthesis module, and a photoelectric conversion module.

[0057] The output of the noise-shaping digital signal generation module is connected to the microwave input of the electro-optic modulation unit to generate noise-shaping digital signals and divide them into N channels with a data rate of f. s / N bps digital signal, where N represents the number of time-interleaved channels, f s This indicates the sampling rate of the digital-to-analog converter.

[0058] Specifically, the noise-shaping digital signal generation module includes a noise-shaping coding unit and a multiplexed digital signal generation unit. In the noise-shaping coding unit, a digital signal with a bit rate of fs is generated using ΔΣ modulation technology. In the multiplexed digital signal generation unit, the digital signal with a bit rate of fs is converted into N digital signals with a bit rate of fs / N.

[0059] Furthermore, the output of the optical short pulse generation module is connected to the input of the optical time interleaving module to generate a repetition frequency of f. S / N optical pulses are generated, and the optical pulses are time-compressed so that the time width of the generated optical pulses is less than 1 / f. S , where f S This represents the sampling rate of the photonic digital-to-analog converter, and N represents the number of time-interleaved channels.

[0060] Specifically, the optical short pulse generation module includes: a multi-wavelength light source array, a wavelength division multiplexing unit, and a pulse generation unit. The multi-wavelength light source array contains N light sources, and the wavelength division multiplexing unit contains a 1×N wavelength division multiplexer. The optical wavelengths corresponding to each branch correspond to the wavelengths of each channel in the multi-wavelength light source array, which is used to combine the signals of different wavelength light sources into one channel. The pulse generation unit is used to generate multi-wavelength optical pulses and to time-compress the optical pulses to avoid inter-pulse interference after time interleaving.

[0061] Furthermore, the N output terminals of the optical time interleaving module are respectively connected to the N input terminals of the electro-optic modulation module to divide the short optical pulses into N paths and apply a delay.

[0062] Specifically, the optical time-interleaving module includes a wavelength demultiplexing unit and a wavelength-time interleaving unit. The wavelength demultiplexing unit contains a 1×N-channel wavelength demultiplexer, which divides the multi-wavelength optical short pulses output from the pulse generation module into N channels. Each channel contains a single-wavelength optical short pulse, which is input to the wavelength-time interleaving unit to apply a delay to the N single-wavelength optical short pulses, such that the delay Δt of the i-th (i>1) channel compared to the first channel is... i =1 / f S *(i-1+k*N), where f S The value represents the sampling rate of the photonic digital-to-analog converter, N represents the number of optical time-interleaved channels, and k is an integer.

[0063] Furthermore, the output of the electro-optic modulation module is connected to the input of the multiplexing module, and is used to modulate the noise-shaping digital signal onto the time-interleaved optical pulse source.

[0064] Specifically, the electro-optic modulation module includes a modulator array consisting of N electro-optic modulators, used to modulate N digital signals onto N time-interleaved optical carriers.

[0065] Furthermore, the output of the multi-channel combining module is connected to the input of the photoelectric conversion module, which is used to combine multiple time-interleaved dimmed signals into one.

[0066] Specifically, the multi-channel synthesis module includes a 1×N wavelength division multiplexer, and the optical wavelengths corresponding to each branch correspond to the wavelengths of each channel in the multi-wavelength light source array.

[0067] Furthermore, the photoelectric conversion module is used to perform photoelectric conversion and filtering on the time-interleaved dimmed signal to obtain an electrical domain signal.

[0068] Specifically, the photoelectric conversion module includes a photodetector and a filter.

[0069] like Figure 3 As shown, with Figure 2 The noise-shaping coding and optical time-interleaved photonic digital-to-analog converters shown are different, in Figure 3 In the middle, the optical short pulse module includes a mode-locked laser used to generate a repetition frequency of f. S / N optical pulses, and time compression of the optical pulses to avoid inter-pulse interference after time interleaving.

[0070] The optical time-interleaving module includes an optical coupler and a time-interleaving unit. The optical coupler is used to split the output signal of the mode-locked laser into N paths, and the time-interleaving unit is used to apply a delay to the N short optical pulses, such that the delay Δt of the i-th (i>1) path compared to the 1st path is... i =1 / f S *(i-1+k*N), where f SN represents the number of channels of optical time interleaving, and k is an integer.

[0071] The multi-path synthesis module includes an optical coupler for merging the N paths of modulated optical carrier signals into one path to obtain the time-interleaved optical carrier signal.

[0072] Figure 3 The remaining modules or units can be set in accordance with the device shown, and will not be described. Figure 2

[0073] As shown in the noise shaping digital signal generation module, first, the ideal signal is encoded by the noise shaping encoding unit to obtain a digital signal with a bit rate of fs, and then in the optical short pulse generation module, a laser array is first composed of N lasers with wavelengths λ1, λ2, …, λ N , a 1×N WDM merges N paths of optical signals into one path, enters the double-drive modulator, the microwave source generates a microwave signal with a frequency of f s / N, which is divided into two paths by a microwave power divider, the phase difference of the two microwave signals is adjusted by a microwave phase shifter, and the two arms of the double-drive modulator are modulated, the output end of the double-drive modulator obtains optical pulses with a repetition frequency of f s / N, and the optical pulses are time-compressed by a single-mode optical fiber to obtain multi-wavelength optical short pulses.

[0074] In the optical time interleaving module, a 1×N WDM is used to demultiplex the multi-wavelength optical short pulses to obtain N paths of single-wavelength optical short pulses, and different delay amounts τ1, τ2, … τ N are applied to each path to obtain time-interleaved optical short pulses, and the delay Δt i of the i(i>1)th path compared to the 1st path is Δt S =1 / f S *(i-1+k*N), where f represents the sampling rate of the photonic digital-to-analog converter, N represents the number of channels of optical time interleaving, and k is an integer.

[0075] In the electro-optical modulation module, N electro-optical modulators are used to modulate N digital signals on N time-interleaved optical pulses.

[0076] In the multi-path synthesis module, a 1×N WDM is used to obtain multi-wavelength optical carrier signals from N paths of single-wavelength time-interleaved modulated optical signals.

[0077] In the photoelectric conversion module, a photodetector is used to perform photoelectric conversion on the time-interleaved modulated optical signal, and a filter is used to filter the obtained electrical signal to obtain the band-limited output signal of the digital-to-analog converter. ​

[0078] As Figure 5 shown, the simulation results of 35-45G linear frequency modulation signal with sampling rate of 100GS / s generated after time interleaving using 4-path 25Gb / s digital signal are shown, wherein, Figure 5 (a) is the ideal output signal characteristics and the noise shaping coding digital signal characteristics, Figure 5 (b) is the process of 4-path optical time interleaving on the coded digital signal, Figure 5 (c) is the time-frequency characteristics of the linear frequency modulation signal with frequency of 35-45GHz and duration of 5μs finally output by the system. It can be seen from Figure 5 that the embodiment of the present application overcomes the problems of difficulty in increasing effective bit and difficulty in high-speed signal synthesis in the current electronic-based digital-to-analog converter affected by electronic bottleneck, and the problems of low equivalent sampling rate and low effective bit in the current photonic digital-to-analog conversion system, and realizes efficient functional integration of noise shaping coding and high-speed signal generation based on time interleaving. The high-bit-rate and low-in-band noise digital signal generation is realized by the noise shaping coding technology based on ΔΣ modulation, and then the high-bit-rate signal synthesis is realized by using the time interleaving of multiple optical short pulses using optical time interleaving technology. It can effectively realize high-bit-rate and high-effective-bit arbitrary signal generation in radar, wireless communication and other fields.

[0079] The photonic digital-to-analog conversion device with noise shaping coding and optical time interleaving according to the embodiment of the present application can effectively utilize the low-jitter characteristics and narrow pulse width characteristics of optical sampling pulses, realize multi-path time interleaving, and further realize high sampling rate digital-to-analog conversion. At the same time, by using this high sampling rate digital-to-analog conversion structure, the advantages of noise shaping technology based on ΔΣ modulation in generating low in-band noise signals can be fully utilized, and the noise shaping digital signal generation technology can be combined with high frequency and large bandwidth signal generation, which can be applied in radar, wireless communication, arbitrary waveform generation and other scenarios.

[0080] Secondly, the photonic digital-to-analog conversion method with noise shaping coding and optical time interleaving according to the embodiment of the present application is described with reference to the accompanying drawings.

[0081] Figure 6 The flowchart of the photonic digital-to-analog conversion method with noise shaping coding and optical time interleaving according to the embodiment of the present application is shown.

[0082] As Figure 6 shown, the photonic digital-to-analog conversion method with noise shaping coding and optical time interleaving includes the following steps:

[0083] S601, generate noise shaping digital signal and optical short pulse, and generate time interleaved optical pulse source by using optical short pulse.

[0084] S602, modulate the noise-shaped digital signal on the time-interleaved optical pulse source to generate a plurality of time-interleaved modulated optical signals; combine the plurality of time-interleaved modulated optical signals into one modulated optical signal, perform photoelectric conversion and filtering on the one modulated optical signal to obtain an electrical domain signal.

[0085] It should be noted that the foregoing explanation of the embodiment of the noise-shaped encoding and optical time-interleaved photon digital-to-analog conversion device is also applicable to the embodiment of the noise-shaped encoding and optical time-interleaved photon digital-to-analog conversion method, which will not be described here.

[0086] The noise-shaped encoding and optical time-interleaved photon digital-to-analog conversion method according to the embodiment of the present application can effectively utilize the low-jitter and narrow pulse width characteristics of the optical sampling pulse, realize multi-path time interleaving, and further realize high sampling rate digital-to-analog conversion. Meanwhile, by using this high sampling rate digital-to-analog conversion structure, the advantages of the noise shaping technology based on ΔΣ modulation in generating low in-band noise signals can be fully utilized, and the noise shaping digital signal generation technology can be combined with high frequency and large bandwidth signal generation, which can be applied in radar, wireless communication, arbitrary waveform generation and other scenarios.

[0087] Figure 7 The structure schematic diagram of an electronic device provided by the embodiment of the present application is shown. The electronic device can include:

[0088] The memory 701, the processor 702, and the computer program stored in the memory 701 and executable on the processor 702.

[0089] The processor 702 implements the noise-shaped encoding and optical time-interleaved photon digital-to-analog conversion method provided in the above embodiments when executing the program.

[0090] Further, the electronic device further includes:

[0091] The communication interface 703 is used for communication between the memory 701 and the processor 702.

[0092] The memory 701 is used to store the computer program executable on the processor 702.

[0093] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0094] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected with each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 7 Only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus.

[0095] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can complete communication between each other through an internal interface.

[0096] The processor 702 can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0097] The embodiment also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the noise shaping encoding and optical time interleaved photon digital-to-analog conversion method as described above.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0099] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0100] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0101] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0102] It should be understood that portions of the application can be realized with a combination of hardware, software, firmware, or their combination. In the above-described embodiments, the N steps or methods can be realized with software or firmware stored in a memory and executed by a suitable instruction execution system. As in another embodiment, if realized with hardware, any one or their combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0103] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0104] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0105] The above-mentioned storage medium can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A photonic digital-to-analog converter with noise shaping coding and optical time interleaving, characterized in that, include: A noise-shaping digital signal generation module based on ΔΣ modulation technology is used to generate noise-shaping digital signals. Optical short pulse generation module, used to generate optical short pulses; An optical time-interlacing module is used to generate a time-interlaced optical pulse source using the aforementioned short optical pulses; An electro-optic modulation module is used to modulate the noise-shaping digital signal onto the time-interleaved optical pulse source to generate multiple time-interleaved modulated signals. A multi-channel synthesis module is used to combine the multiple time-interleaved dimmed signals into a single dimmed signal. as well as The photoelectric conversion module is used to perform photoelectric conversion and filtering on the dimmed signal to obtain an electrical signal.

2. The apparatus according to claim 1, characterized in that, The noise-shaping digital signal generation module includes: The noise shaping and coding unit is used to generate noise-shaped and coded digital signals; A multiplexed digital signal generation unit is used to perform multiplexing encoding on the digital signal to generate the noise-shaped digital signal.

3. The apparatus according to claim 1, characterized in that, The optical short pulse generation module includes: A multi-wavelength light source array, wherein the multi-wavelength light source array has multiple light sources; The first wavelength division multiplexing unit includes a 1×N first wavelength division multiplexer. The optical wavelength of each branch of the 1×N first wavelength division multiplexer corresponds to the wavelength of each path in the multi-wavelength light source array, so as to combine the signals of different wavelength light sources into one path to obtain the wavelength division multiplexed optical signal. The pulse generation unit is used to modulate the wavelength division multiplexed optical signal to generate multi-wavelength optical pulses and to time-compress the multi-wavelength optical pulses.

4. The apparatus according to claim 3, characterized in that, The optical time-interlacing module includes: Wavelength demultiplexing unit, the wavelength demultiplexing unit includes a 1×N-channel wavelength demultiplexer to divide the multi-wavelength optical short pulses into N channels, wherein each channel contains a single-wavelength optical short pulse; A wavelength-time interleaving unit is used to apply a delay to the short optical pulses of a single wavelength in the N channels.

5. The apparatus according to claim 1, characterized in that, The optical short pulse generation module includes: A mode-locked laser is used to generate optical pulses and to time-compress the optical pulses.

6. The apparatus according to claim 5, characterized in that, The optical time-interlacing module includes: An optical coupler is used to split the output signal of the mode-locked laser into N paths, resulting in N short optical pulses. The time interleaving unit is used to apply a delay to the N optical short pulses.

7. The apparatus according to claim 1, characterized in that, The electro-optic modulation module includes: A modulator array comprising N modulators.

8. The apparatus according to claim 3, characterized in that, The multi-channel synthesis module includes: The second wavelength division multiplexing unit includes a 1×N second wavelength division multiplexer. The optical wavelength of each branch of the 1×N second wavelength division multiplexer corresponds to the optical wavelength of each path of the multi-wavelength light source array, so as to combine the modulated optical signals of different wavelengths into one path to obtain a modulated optical signal after time interleaving.

9. The apparatus according to claim 1, characterized in that, The multi-channel synthesis module includes: An optical coupling unit is used to combine N modulated signals into one, resulting in a single modulated signal after time interleaving.

10. The apparatus according to claim 1, characterized in that, The photoelectric conversion module includes: A photodetector and a filter are used to perform photoelectric conversion and analog filtering on the modulated signal to obtain an electrical signal.

11. A photonic digital-to-analog conversion method using noise shaping coding and optical time interleaving, characterized in that, Includes the following steps: Noise-shaped digital signals and short optical pulses are generated, and the short optical pulses are used to generate a time-interleaved optical pulse source. The noise-shaping digital signal is generated based on ΔΣ modulation technology; The noise-shaping digital signal is modulated onto the time-interleaved optical pulse source to generate multiple time-interleaved modulated signals. The multiple time-interleaved modulated signals are combined into a single modulated signal, and the single modulated signal is then subjected to photoelectric conversion and filtering to obtain an electrical domain signal.

12. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, the processor executing the program to implement the photonic digital-to-analog conversion method of noise shaping coding and optical time interleaving as described in claim 11.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the photonic digital-to-analog conversion method of noise shaping coding and optical time interleaving as described in claim 11.

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