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- 实验方案
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Photonics-based receiver for decoupled velocity and range measurement
摘要： Photonics-based receiver for decoupled velocity and range measurement is proposed and demonstrated. A dual-chirp LFM signal is used. At the receiver, the reference signal and the received echoes are modulated to the optical carrier, respectively. By introducing the micro- wave photonic image reject mixing, the frequency components corresponding to the target range and ve- locity can be obtained simultaneously. No complex simulation source in electrical digital domain is needed, and no special requirement with the dual-chirp LFM sig- nals is required. A proof-of-concept experiment is taken. A dual-chirp LFM signal centered at 10 GHz with a 4- GHz bandwidth is used. The target range and the Dop- pler-frequency shift are successfully obtained.
关键词： microwave photonics,LFM signal,dual-chirp,velocity,range
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Compact silicon multicast switch for pCDC ROADM based on thermooptic Mach-Zehnder interferometers
摘要： We propose an optimized multicast switch for colorless, directionless and partially contentionless ROADM and experimentally demonstrate a 2×8 silicon multicast switch, which consists of six 3-dB multimode interference splitters and four Mach-Zehnder 2×2 optical switches.
关键词： Optical interconnect,multicast,silicon photonics,optical switches,CDC ROADM
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Five-port non-blocking silicon optical router based on mode-selective property
摘要： We propose and demonstrate a five-port optical router based on mode-selective property. It utilizes modes as labels to distinguish its routing paths. The optical signal-to-noise ratios for all paths are larger than 16.3 dB.
关键词： Optical interconnect,Silicon photonics,mode-division multiplexing,optical switching
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Single Bandpass Microwave Photonic Filter based on Gain-switched Distributed-feedback Laser
摘要： In this paper, a single bandpass microwave photonic filter (MPF) based on a gain-switched distributed feedback (DFB) laser is proposed and experimentally demonstrated. Self-phase modulation (SPM) effect is explored the performance of the proposed MPF. A single passband is achieved for the proposed MPF, which can be tuned from 1 GHz to 39 GHz. A theoretical model describing the principle of the proposed MPF is derived, which is confirmed by experimental results.
关键词： Tunable filter,Microwave photonics,Semiconductor lasers
更新于2025-09-16 10:30:52
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High-Speed and High-Resolution Microwave Photonic Interrogation of a Fiber-Optic Refractometer With Plasmonic Spectral Comb
摘要： Microwave photonic interrogation of a high-speed and high-resolution refractive index (RI) sensor based on a tilted fiber Bragg grating with surface plasmon resonance (TFBG-SPR) is proposed and experimentally demonstrated. Instead of demodulating the wavelength shift or intensity change of a TFBG-SPR spectrum in the optical domain, we convert the TFBG-SPR spectrum to the time domain based on spectral shaping (SS) and wavelength-to-time (WTT) mapping and use a digital signal processor (DSP) to extract the RI information at a high speed and high resolution. In the experiment, when an Au-coated TFBG is immersed in a solution, the TFBG-SPR spectrum will produce a dip. When the RI changes, the location of the dip in the TFBG-SPR spectrum will shift, which is a function of the RI. By passing a broadband frequency-chirped optical pulse generated by a frequency swept laser source to the TFBG-SPR and detecting the optical pulse at the output of the TFBG-SPR at a photodetector (PD), due to SS-WTT mapping, a temporal waveform with its shape identical to the optical spectrum is produced. A DSP is then used to extract the SPR envelope information from the temporal waveform. By monitoring the changes of the SPR envelope, the RI information is interrogated with a high resolution of 1.123×10-6 RIU at a high speed over 20 kHz.
关键词： Surface plasmon resonance,Tilted fiber Bragg grating,Microwave photonics,Refractive index measurement
更新于2025-09-16 10:30:52
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Investigation of Chaotic and Spiking Dynamics in Mid-Infrared Quantum Cascade Lasers Operating Continuous-Waves and Under Current Modulation
摘要： This study investigates chaotic and spiking dynamics of mid-infrared quantum cascade lasers operating under external optical feedback and emitting at 5.5 μm and 9 μm. In order to deepen the understanding, the route to chaos is experimentally studied in the case of continuous-wave and current modulation operation. The non-linear dynamics are analyzed with bifurcation diagrams. While for quasi-continuous wave operation, chaos is found to be more complex, pure continuous wave pumping always leads to the generation of a regular spiking induced low-frequency ?uctuations dynamics. In the latter, results show that by combining external optical feedback with periodic forcing and further induced current modulation allows a better control of the chaotic dropouts. This work provides a novel insight into the development of future secure free-space communications based on quantum cascade lasers or unpredictable optical countermeasure systems operating within the two transparency atmospheric windows hence between 3 μm–5 μm and 8.5 μm–11 μm.
关键词： entrainment phenomenon,quantum cascade laser,secure communications,external optical feedback,mid-infrared photonics,Nonlinear dynamics
更新于2025-09-16 10:30:52
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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) - Mode-Division Multiplexed PAM-4 Signal Transmission in a Silicon Photonic Chip
摘要： Emerging 5G mobile networks and cloud computing applications are driving the demand for an ever-increasing capacity for short-reach optical communications. To meet this demand, mode-division multiplexing (MDM) is being employed to scale up the bandwidth capacity by leveraging the spatial modes of an optical waveguide for transmitting multiple optical signals. On the other hand, the use of PAM-4 can also increase the transmission bandwidth since PAM-4 offers four amplitude levels in a symbol and thus its bit rate is twice as high as OOK at a same baud rate. Therefore, on-chip MDM with PAM-4 is an approach to enhance the transmission capacity in a photonic integrated circuit. In this paper, we report a photonic integrated four-channel MDM circuit that is implemented on a silicon platform with a small size and low channel crosstalk. By using the MDM circuit, a 80 Gbit/s mode-division multiplexed PAM-4 signal transmission is experimentally demonstrated. The advantage of the approach is that high data capacity on-chip communications is enabled by the photonic integrated MDM circuit with a small footprint. The MDM circuit can be employed in a radio over fiber (RoF) system to increase the data transmission capacity of the RoF link.
关键词： PAM-4,silicon photonics,mode-division multiplexing
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Silicon Photonics at the Interface with a Phase Change Material
摘要： Phase change materials (PCMs) have the ability to control the phase [1], polarization [2], amplitude and coloration [3] of light. Examples of such materials are vanadium dioxide (VO2), GeSbTe and AgInSbTe, which can, owing to changes in their refractive indices, alter the properties of light. Although PCMs have been studied in situations where light propagates from a low-index medium (e.g. air) into the material, there are more possibilities when total internal reflection is involved. In this paper, we investigate the interaction between light travelling in a dense medium with a phase change layer, with particular attention paid to interfaces involving silicon. The possibility of tuning and controlling light at the interface with silicon would be of interest for silicon photonics applications.
关键词： silicon photonics,total internal reflection,vanadium dioxide,Phase change materials,polarization
更新于2025-09-16 10:30:52
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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) - Multi-core Fiber Technology supporting MIMO and Photonic Beamforming in 5G Multi-Antenna Systems : (Invited paper)
摘要： This paper describes and experimentally validates different multi-antenna system applications supported by a multi- core fiber (MCF) optical fronthaul. The MCF fronthaul enables the simultaneous transmission of different optical data streams at the same wavelength by the spatial multiplexing of multiple-input multiple-output (MIMO) signals. In addition, the MCF enables simultaneous radio beamforming by transmitting the same optical data signal with different phase or time delays to each antenna element. Both MIMO and beamforming capabilities are required for 5G multi-antenna systems. Experimental demonstrations of 4×4 MIMO transmission and multi-beam 4×1 beamforming using a commercially available 4-core fiber are reported in this work. Optical beam-steering in 5G is achieved using a Si3N4 photonic chip based on optical ring resonators (ORRs) that enables the continuous and centralized tuning of the time delay applied to each antenna element.
关键词： integrated photonics,beamforming,MIMO,Multi-core fiber,multi-antenna systems,radio beam-steering,optical ring resonator (ORR)
更新于2025-09-16 10:30:52
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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) - Integrated all optical sampling of microwave signals in silicon photonics
摘要： Optical sampling of pseudo random microwave signals with sinc-shaped Nyquist pulse sequences has been demonstrated in an integrated silicon photonics platform. An electronic-photonic, co-integrated depletion type silicon intensity modulator with high extinction ratio has been used to sample the microwave signal with a sampling rate, which corresponds to three times its RF bandwidth. Thus, a sampling rate of 21 GSa/s is achieved with a 7 GHz modulator, with 3 dBm of differential input power.
关键词： all-optical sampling,Mach-Zehnder modulator,Silicon photonics,Nyquist pulses
更新于2025-09-16 10:30:52