- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Reconfigurable photonic RF filters based on integrated Kerr frequency comb sources
摘要： We demonstrate two categories of photonic radio frequency (RF) filters based on integrated optical micro-combs. The first one is based on the transversal filtering structure and the second one is based on the channelization technique. The large number of wavelengths brought about by the microcomb results in a significantly increased RF spectral resolution and a large instantaneous bandwidth for the RF filters. For the RF transversal filter, we demonstrated Q factor enhancement, improved out-of-band rejection, tunable centre frequency, and reconfigurable filtering shapes. While a high resolution of 117 MHz, a large RF instantaneous bandwidth of 4.64 GHz, and programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes are demonstrated for the RF channelized filter. The microcomb-based approaches feature a potentially much smaller cost and footprint, and is promising for integrated photonic RF filters.
关键词： Microwave photonics,micro-ring resonators
更新于2025-09-11 14:15:04
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - A Segmented Photonic Digital-to-analog Converter with a High Effective Number of Bits
摘要： The demonstration of a novel photonic digital-to-analog converter (PDAC) based on a segmented structure is reported. The segmented PDAC is composed of binary-coded and unary-coded parts, corresponding to a reduced ratio of the most significant bit (MSB) to the least significant bit (LSB) compared to a traditional binary PDAC. A proof-of-concept 2-bit segmented PDAC is built, which shows a greatly improved effective number of bits (ENOB) of 1.76 bits in a test frequency range of 100 MHz. A maximum ENOB of 1.96 is achieved at 100 MHz. In generating a 23-GHz linear frequency-modulated signal, the segmented PDAC achieves a signal-to-noise ratio (SNR) of 23.4 dB, compared to 16.8 dB for the binary PDAC.
关键词： segmented structure,digital-to-analog conversion,high ENOB,microwave photonics
更新于2025-09-11 14:15:04
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Nonuniform Microwave Photonic Delay-Line Filter For Optical Sensor Network Interrogation
摘要： We propose a new design of nonuniform spaced microwave photonic delay-line filter based generic optical fiber sensors interrogation platform. Both the amplitude and phase response of the microwave filter are used to demodulate optical sensors. Therefore, a large sensor network with different types of optical sensors can be interrogated simultaneously. The concept of this new microwave photonics enabled interrogation approach is presented and verified by simulations where four different types of optical sensors are simultaneously interrogated via inverse Fourier transform of filter frequency response.
关键词： time delay,fiber Bragg grating,microwave photonics,finite impulse response,Fourier transform,optical sensors
更新于2025-09-11 14:15:04
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[IEEE 2018 International Topical Meeting on Microwave Photonics (MWP) - Toulouse (2018.10.22-2018.10.25)] 2018 International Topical Meeting on Microwave Photonics (MWP) - All Photonic Radar System based on Laser Frequency Sweeping and Leaky-Wave Antennas
摘要： In this paper, we report on a novel all photonic FMCW radar system for detection and localization of multiple objects. This functionality is achieved by utilizing the self-sweeping of tunable external cavity lasers (ECLs) in combination with optical heterodyning for generating a millimeter-wave FMCW radar signal. In order to also localize the objects, frequency scanning mm-wave leaky-wave antennas (LWAs) are used. The LWAs enable beam steering via the FMCW signal for estimating the direction of arrival (DoA) of the radar echos. Overall, this approach yields very compact all photonic radar systems that do not require electrical oscillators or optical modulators. In addition, thanks to the LWAs, multiple objects can be localized within a single sweep and without any clock or control signals. Experimentally, the performance of a developed all photonic 60 GHz radar with a 10 GHz bandwidth is demonstrated for multiple object detection and localization. It is shown that the developed radar provides a range and DoA angle estimation error of <1 cm and ~3°, respectively. This is achieved without using any dedicated radar signal post-processing algorithms.
关键词： Tunable Lasers,FMCW radar,Beam Steering,Microwave photonics,Leaky-Wave Antennas
更新于2025-09-11 14:15:04
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Demonstration of a Sub-GHz flat-top RF-Photonic Filter Enabled by Fourth-order Dispersion Compensation
摘要： We demonstrate a sub-GHz RF-photonic filter based on phase and amplitude control of a wideband all-fiber frequency parametric comb with 25-GHz tone spacing. The narrow bandwidth filter construction based on 221 comb tones was enabled by fourth-order dispersion compensation of the dispersive element. The filter integrity was further tested by retrieval of a set of digital modulated RF channels.
关键词： Chromatic dispersion,Microwave photonics,Optical signal processing,Finite impulse response filters
更新于2025-09-11 14:15:04
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Signal-to-Noise Ratio of True-Time Delay Beamformers Based on Microwave Photonic Links Using an Incoherent Broadband Optical Source
摘要： The signal-to-noise ratio (SNR) of true-time delay beamformers based on microwave photonic links using an incoherent broadband optical source (IBOS) is investigated. A comprehensive theory considering the bias angle of the Mach-Zehnder modulator employed in the microwave photonic link is presented to analyze the SNR. When the RF signal at the fundamental frequency is fed by the beamformer, the SNR is a function of the bias angle, the frequency of the applied RF signal, the modulation index, the system dispersion and the shape of the IBOS. We ?nd that by biasing the MZM near the minimum transmission point, the SNR at the fundamental frequency is maximized. On the other hand, by exactly biasing the MZM at the minimum transmission point, the RF signal at the double frequency can be fed by the beamformer with maximum power. The maximum SNR at the double frequency is a function of the frequency of the applied RF signal, the system dispersion and the shape of the IBOS while its dependence on the modulation index is eliminated. In both cases, the relationship between the SNR and the frequency of the RF signal, the system dispersion and the shape of the IBOS is also investigated. An experiment is carried out to verify the theoretical analysis, and the experiment results agree well with the calculation.
关键词： modulation,dispersion,true-time delay,incoherent broadband optical source,signal-to-noise ratio,Microwave photonics,phased array antennas
更新于2025-09-11 14:15:04
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A Multiband Transparent Transponder Based on Reconfigurable Optical Frequency Combs for Cross Connection of Intersatellite and Satellite Ground
摘要： In this paper, a parallel multiband frequency-conversion scheme for satellite applications based on a single optical frequency comb is proposed, and a recon?gurable satellite transponder is designed for future multiband broadband satellites. In addition, we establish a test system of onboard multiband frequency-conversion on the strength of microwave photonics and, a proof-of-concept experiment is demonstrated in which a Ka-band signal is converted to other satellite frequency bands. The experimental results reveal our system feasibility, and the bit error rate of recovered baseband data is less than 10–9. Moreover, the optical frequency combs can be recon?gured by adjusting the parameters of the local oscillator and optical modulator.
关键词： multi-band frequency conversion,Microwave photonics,recon?gurable satellite transponder.,optical frequency comb
更新于2025-09-10 09:29:36
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Microring resonator-based photonic system for terahertz signal generation
摘要： We propose a photonic system based on add–drop microring resonator and mode-locked laser for terahertz (THz) signal generation. A mode-locked laser acts as an input source to the microring resonator. The transfer characteristics of the microring resonator generate Lorentzian shaped pulses at the output ports of the microring resonator. These series of pulses obtained are then investigated in two approaches; in the ?rst approach, the output of the microring resonator is given to a photodetector which generates 33 THz pulses separated by a spacing of 1 THz with a full width at half maximum (FWHM) of 0.15 THz. In the second approach, the output of the microring resonator is given to an optical ?lter to extract a particular frequency component. In this case, a single THz carrier with a FWHM of 0.2618 THz is obtained. The THz frequency components generated by the proposed photonic system can act as carriers for communication between the indoor user and the base station of a pico/femto cell in a 5G environment.
关键词： THz signal generation,Microwave photonics,Microring resonator,Frequency comb generation,Mode-locked laser
更新于2025-09-10 09:29:36
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Integrated On-chip Bragg Time-Delay System for Thermo-Optical Control of a Microwave Antenna
摘要： This theoretical modeling-and-simulation paper presents designs and projected performance of ~1550-nm silicon-on-insulator beamsteering of a microwave phased-array antenna by the use of true time delays. The tunable on-chip optical delay line is a cascade connection of waveguide Bragg grating resonators (WBGRs) separated by a piece of straight waveguide. The notch in the reflectivity spectrum is translated along the wavelength axis by means of a low-power TO heater stripe atop the grating, inducing a time delay that depends upon the line position of the WBGR affected by TO switching. The filter resonator is a new in-guide array of identical Bragg structures, each one comprising N closely coupled phase-shifted Bragg-grating resonators. The length of each grating cavity in an N group is chosen according to the Butterworth filter technique to provide one resonant spectral profile with 40 GHz optical bandwidth. Finally, we examined the performances of the beamformer system operating in the X and Ku bands, respectively. The investigation demonstrated that steering angles up to 48° are feasible by assuming a minimum steering angle of 8° and a minimum WBGR spacing of about 354 and 236 μm for X and Ku bands, respectively.
关键词： Bragg grating resonators,Microwave Photonics,True Time Delays
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Portland, OR, USA (2018.11.13-2018.11.14)] 2018 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Frequency Agile Photonic Front-End for Wideband Transmission and Reception
摘要： We have developed and tested a 0-45 GHz frequency agile photonic front-end for up- and down-conversion of signals with >800 MHz instantaneous bandwidth, <1 us switching speed, and low end-to-end latency. The 3U OpenVPX system has been tested in a TRL6 demonstration.
关键词： millimeter-wave photonics,photonic front-ends,pulsed photonic links,microwave photonics
更新于2025-09-09 09:28:46