The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper demonstrates a push-pull traveling-wave Mach-Zehnder modulator on InP which operates up to 50Gb/s in C band optical transmission system. This MZM could potentially be integrated to form the IQ modulators, Dual IQ modulators and PM-IQ modulators to achieve higher operating speed.
A novel optoelectronic oscillator by using cascade microwave photonic filters is proposed and demonstrated. The obtained RF signal shows a tuning range from 0 to 40 GHz. The side-mode rejection ratio maintains higher than 40 dB during the tuning process. At 10 kHz offset frequency, the measured phase noise of the 21-GHz signal is −98 dBc/Hz.
A microwave photonic radar system with optical generation and de-chirping processing of broadband linear frequency modulated continuous-wave signal is proposed for high-resolution and real-time inverse synthetic aperture radar (ISAR) imaging. A K-band microwave photonic radar prototype is established and the ISAR imaging feasibility is experimentally investigated. The imaging results verify that the...
We present a cost-efficient GHz-wide arbitrary-shaped microwave photonic filter based on stimulated Brillouin scattering in fiber. By employing a directly-modulated laser with well-designed current waveform and feedback adjustment, the filter shape has been arbitrarily controlled with high precision.
Cloud radio access network (C-RAN) is a persuasive solution to the burst capacity in future 5G mobile system and it can tackle the tidal effect in mobile networks for better resource utilization. We propose a remote radio head (RRH) protection scheme to assure the availability of the RRHs. A protection layer is proposed to support re-configurable protection of the RRHs, with good scalability.
We propose and demonstrate a tunable optoelectronic oscillator (TOEO) based on coupled double loops (CDLs) and stimulated Brillouin scattering (SBS). By the incorporation of CDLs and SBS, we not only improve the side-mode suppression ration (SMSR) of the SBS-based OEO, but also enhance the stability of the generated signals. Microwave signals with a tunable range from 2 GHz to 18 GHz are generated...
We propose and demonstrate a new and extremely simple concept of reconfigurable photonic generation of arbitrary RF waveforms, based on a single CW laser and a frequency shifting loop. Our system does not require broadband light source or fast electronic generator. It is capable of generating arbitrary RF waveforms with duration ranging from 1 ns to more than 100 ns, and with dynamic performances...
A novel configuration operating at 1550 nm based on silicon-on-insulator substrate is proposed for side-lobes suppression of a dielectric optical nanoantenna. The proposed configuration consists of reflection gratings which can reflect the downward light back. By using this configuration, the side-lobe level can be improved by 12.78 dB.
A microwave photonic filter (MPF) with reconfigurable frequency responses using a phase-shifted fiber Bragg grating (PS-FBG) of two phase shifts is proposed and a two-passband filter is experimentally demonstrated with tunable frequency spacing. The PS-FBG with two phase shifts acts as an optical notch filter to suppress one sideband of the phase-modulated signals. Thus, the phase-modulated signals...
A low-frequency electrical spectrum analysis method is researched for evaluating broadband characteristics of high-speed dual-parallel Mach-Zehnder modulators (DPMZMs) based on dual-frequency modulation and fixed-frequency bias. The method enables the broadband and high-resolution evaluation for the modulation depth and half-wave voltage of a high-speed DPMZM by using a low-frequency photodetector...
Using commercial IEEE 802.11n/ac access points, the feasibility of 3×3 space-division-multiplexed MIMO transmission over a single OM3 multimode fiber is experimentally demonstrated. More than two-fold multiplexing gain is realized for up to 1km fiber length with a tight fiber bend radius of 2mm.
A cascaded optically injected semiconductor laser based bandpass microwave photonic filter (MPF) is proposed and then demonstrated by a proof-of-concept experiment in this paper. Combining the two gain spectra of the slave laser, the performance of the MPF is enhanced. The frequency response under different injection parameters are investigated. The tuning range of the passband central frequency is...
A photonic analog-to-digital converter with multiplied sampling rate based on a fiber ring is proposed and demonstrated. Using optical pulses with 100-MHz repetition rate, equivalent sampling rates with multiplication factors of 5 and 7 are experimentally achieved. The proposed approach features simple configuration with no parallel structure, which can find application in photonics-based coherent...
A 10 GS/s photonic sub-sampling ADC is proposed and experimentally demonstrated. The single-sideband phase noise of the optoelectronic oscillator is tested to be −128 dBc/Hz at 10 kHz offset and the aperture jitter of the photonic ADC is 40.3 fs with the integral interval from 1 kHz to 10 MHz. 23 GHz and 43.1 GHz signals are sampled by the system with the ENOB of 5.0 bits and 4.2 bits.
A compact optical-microwave phase detector is proposed and its performance is evaluated by synchronizing an 8-GHz oscillator to a 250-MHz mode-locked laser. The residual out-of-loop phase noise at 1 Hz and 100 kHz offset are −115 dBc/Hz and −146 dBc/Hz respectively. And the RMS timing jitter is 600 as when integrated from 100 kHz to 1 Hz. The proposed phase detector has a compact structure and is...
We present the concept, design, fabrication and preliminary measurement results of a RF photonic fronted on a photonic IC chip. The RF photonic frontend employs linear optical phase modulation and linear phase demodulation by an ACP-OPLL. The link achieves frequency down-conversion by optical sampling. The preliminary results demonstrated down conversion SFDR of 108.1dBHZ2/3 with 1GHz RF and 50MHz...
We designed and optimized a high-speed, low-loss electrodes applied to photodetector array (PDA) using simulating software HFSS. The designed electrodes structure was fabricated and tested. Compared with the electrodes before optimization, the insert loss decreased by 1.1dB at 40GHz and the bandwidth increased by 8GHz.
An RoF system using a quadrature-multiplexing technique is shown experimentally to improve the 3rd order SFDR by 2.7dB over an intrinsic optical link. As a result of orthogonality between quadrature sidebands, the system can support MIMO.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.