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This paper presents an energy-efficient visible light communication (VLC) receiver SoC that utilizes ambient light rejection and post-equalization techniques for emerging LiFi applications. Based on ordinary phosphorescent white LEDs, a 24-Mb/s IEEE 802.15.7-compliant LiFi link is demonstrated over 1.6 m with a BER below 10−9.
We propose a novel spectrum analyzer based on heterodyne down-conversion with two detuned optical frequency combs for rapid, wideband characterization of RF signals. The measurement bandwidth of ∼40GHz is limited by modulator speed and the system latency and frequency resolution are time-bandwidth limited.
We demonstrate a new approach to generate microwave arbitrary waveforms by phase modulation and optical carrier processing based on gain-transparent SBS. Triangular waveforms at repetition rates of 5.64 and 7.87 GHz, and rectangular waveforms at repetition rates of 5.04 and 7.01 GHz are generated.
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...
We report a fully integrated microwave photonic passband filter on a silicon photonic chip. The on-chip integrated microwave photonic filter (IMPF) consists of a high-speed phase modulator (PM), a thermally tunable high-Q micro-disk resonator (MDR), and a high-speed photodetector (PD). The bandpass filtering function of the IMPF is implemented based on phase modulation and phase-modulation to intensity-modulation...
This paper describes the first optical phase lock loop (OPLL) based on a photonic integrated circuit (PIC) fabricated using a generic foundry process and off-the-shelf electronic components. The PIC contains a DBR laser that is for the first time frequency and phase stabilized in reference to an Optical Frequency Comb Generator (OFCG) line. The OFCG used in this demonstration offers 19 highly coherent...
This paper presents an innovative architecture of photonics-based RF scanning receiver that exploits a digital feedforward noise cancellation method for removing the beat noise between the lasers used in the scheme, instead of a complex laser locking mechanism as in a previous implementation. Moreover, compared with conventional channelized implementations, it reaches wide operating frequency range...
This paper presents the first demonstration of a uni-travelling carrier photodiode (UTC-PD) used as a receiver of a wirelessly transmitted quadrature phase shift keying (QPSK) signal. In this demonstration, a 1 Gbaud QPSK signal centered at 33.5 GHz was transmitted over a wireless distance of 1.4 m. At the receiver, a UTC-PD is used to down-convert the RF signal to an intermediate frequency (IF) of...
An electro-optic chaos generator is proposed based on phase modulation to intensity modulation conversion and an analog-digital hybrid feedback loop. The analog part takes the digital sequences from shift registers as input and converts them into analog noise like signal, from which new bits are determined. The effective bandwidth and complexity of the output analog signal can reach a high level with...
A novel optically tunable frequency-multiplying optoelectronic oscillator (OEO) to generate a high frequency microwave signal without employing an optical filter is proposed. The upper dual parallel Mach-Zehnder modulator (DP-MZM) integrated in a dual-polarization quadrature phase shift-keying (DP-QPSK) modulator is accurately biased to serve as an equivalent phase modulator (e-PM), which functions...
A distributed feedback semiconductor optical amplifier (DFB-SOA) based optical vector network analyzer (OVNA) is proposed. The proposed OVNA is realized by mapping the transmission response of the optical device under test (ODUT) into electrical domain. The key principle of the OVNA is the optical carrier recovery resulted by the DFB-SOA. Using the proposed OVNA, the transmission spectrum of an optical...
Real-time THz-wave wireless OFDM communication, which is assisted by optical technology, is reported. A 4 × 10 Gbit/s THz-wave OFDM signal is transferred into an optical OFDM signal, and the optical OFDM signal is successfully demultiplexed into four sub-carrier channels with an integrated-optic DFT circuit.
We propose a dual-band linear frequency-modulated continuous wave (LFMCW) radar receiver based on a microwave photonic in-phase and quadrature (I/Q) mixer, able to simultaneously operate on two different bands over a very board frequency range. The sharing of hardware resources and joint processing of dual bands are implemented by applying a special dual-band sensing waveform. An unambiguous and independent...
We propose a novel integration based technique employing a cascaded pair of microring resonators on silicon-on-insulator (SOI) platform for achieving a tunable single passband microwave photonic filter (SPMPF). A double microring structure is used to provide an all-integration approach to eliminate the usual selectivity dependence of the radio frequency (RF) response on the shape of a single ring...
We describe recent progress in integrated microwave photonics in wideband signal processing applications with a focus on the key signal processing building blocks, the realization of monolithic integration, and cascaded photonic signal processing for analog RF photonic links.
Wireless bridges operating at THz frequencies have drawn a lot of attention in recent years. This application requires multiple optical local oscillators (LOs) throughout the link and, hence, the accumulated phase noise may impose a major challenge for its practical implementation. Of all the techniques to mitigate phase noise, single sideband (SSB) modulation is a very promising candidate due to...
A low-loss and low-crosstalk Mach-Zehnder mode/wavelength multi/demultiplexer based on silica-PLC platform is proposed for WDM/MDM transmission. The Mach-Zehnder filter for “mode” and “wavelength” can be constructed by newly designed broadband 3dB-mode-divider. Furthermore, using Si/silica hybrid platform, footprint of the chip can be drastically reduced.
We propose a blind technique to identify the number of polarization in an optical signal using Principal Component Analysis (PCA). Experimental results verifying the proposed technique are presented. Additionally, the relation between PCA and Independent Component Analysis (ICA) are discussed.
We briefly introduce a concept for linear an d nonlinear digital pre-distortion (DPD) of high-speed optical transmitters. As an extension to previous results, we investigate the imp act of th e DPD schemes on a wavelength-division multiplexing (WDM) trans mission of 32 GBd polariz ation-division multiplexed (P DM) M –ary quadrature amplitude modulated (M-QAM) signals. The investigated formats range...
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