Xiangfei Chen - IEEE Xplore Author Profile

Showing 1-25 of 191 results

Filter Results

Show

Results

We develop a novel broadband comb light source for sensing multiple fiber Bragg gratings (FBGs). This broadband light source is realized through a Fabry-Pérot laser with intracavity saturable absorbers (FP-SA), which is a new type of low-cost and highly integrated semiconductor laser solution. The laser chip measures 1500 μm in length and 300 μm in width. Based on a waveform shaper and the FP-SA l...Show More
Nonlinear compensation technology is the key to frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) systems. Among compensation algorithms, the iterative learning control (ILC) pre-distortion algorithm has gained much attention for its high accuracy and simplicity. However, the conventional ILC algorithm can only be used for offline calibration because it cannot work for...Show More
A 16-channel electroabsorption modulated tunable multi-wavelength DFB laser array is proposed and experimentally demonstrated. The sixteen DFB lasers, each with a wavelength spacing of 100 GHz, are arranged in a 4 × 4 matrix. The wavelengths are designed using an interleaving scheme to reduce grating crosstalk. The grating is designed and fabricated using the reconstruction equivalent chirp (REC) ...Show More
A novel fiber Bragg grating (FBG) sensing system with a core laser source comprising a high-density integrated distributed feedback (DFB) laser array based on the reconstruction-equivalent-chirp (REC) technique is presented and demonstrated. This study proposes a fast and wideband wavelength-swept laser (WSL) based on a DFB laser array. 24 lasers are monolithically integrated with an 8 × 3 matrix ...Show More
Two-dimensional (2D) sampling structures based on tilted Bragg grating (TBG) for distributed feedback (DFB) laser are proposed and demonstrated. The phase-matching condition of the 2D sampled grating between grating vectors of basic grating and the Fourier component of sampling structure is systematically elaborated. The lightwave experiences different propagating path in the grating area of vario...Show More
A wavelength-tunable electroabsorption-modulated DFB laser (EML) with performance enhanced by the integrated thin film heater is proposed and experimentally demonstrated. The reconstruction equivalent chirp (REC) technique is used to simplify the grating fabrication and introduce equivalent phase shifts in the cavity to guarantee single-mode operation. The electroabsorption modulator and the DFB l...Show More
A time- and wavelength-division multiplexed interrogation system for weak fiber Bragg grating (WFBG) array based on the tunable reconstruction-equivalent-chirp distributed feedback (REC-DFB) laser array is introduced. This system can simultaneously and accurately acquire the sensing positions and achieve reflection spectra of multiple identical WFBG array with various central wavelengths, enhancin...Show More
We propose and demonstrate a 150-channel multi-wavelength distributed feedback (DFB) laser array for dense wavelength division multiplexing (DWDM) systems. The proposed multi-wavelength laser array with wavelength spacing at 0.8 nm (100 GHz) meets the ITU-T specifications. To the best of our knowledge, the 150-channel multi-wavelength DFB laser array reported in this paper represents the highest n...Show More
In this paper, a two-section integrated mutual injection distributed feedback (DFB) direct modulation laser based on reconstruction equivalent chirp (REC) technology is designed. By using the combined effect of optical injection locking and detuned-loading, the 3-dB modulation bandwidth of the mutual injection laser is increased to 28 GHz, and the side-mode suppression ratio (SMSR) is higher than ...Show More
A wideband fast-sweeping tunable laser array has been designed and fabricated based on reconstruction-equivalent-chirp (REC) technique. The total continuous wavelength tuning range of the multiwavelength laser array is greater than 48 nm with a sweep speed of 5 kHz. By continuous measuring of a fiber Bragg grating (FBG) utilizing the wavelength-swept DFB laser array, it shows a maximum wavelength ...Show More
Optical switching based on arrayed waveguide grating routers (AWGRs) and fast tunable sources is a future-proof solution to overcome the bottleneck of limited bandwidth and high latency of electrical switches-based data center networks (DCNs). To support fine-grained optical packet switching and maintain high network throughputs, tunable sources capable of nanosecond-scale hitless wavelength switc...Show More
Photonic convolutional neural networks (PCNNs) are gaining attention owing to their potential to overcome the von Neumann bottleneck. Here, we propose and demonstrate experimentally and numerically for the first time a hybrid PCNN consisting of semiconductor optical amplifiers (SOAs) as synapses and integrated quantum-well Fabry-Perot lasers with saturable absorbers (FP-SAs) as photonic neurons. I...Show More
Photonic neuromorphic computing based on spiking dynamics has been a promising approach for constructing low-latency and energy-efficient non-von Neumann architecture. However, the system is severely limited by the discrete optical injection and modulation devices. We proposed and demonstrated a true full-integrated spiking neuron based on a monolithic integrated directly modulated laser-distribut...Show More
In this letter, we propose and demonstrate a tunable in-series distributed feedback (DFB) laser array, and the wavelength is continuously tuned with the assistance of the monolithically integrated thin-film heater. Compared with an in-parallel laser array with an optical combiner, the proposed in-series DFB laser array avoids significant power loss resulting from the optical combiner. The three-se...Show More
The multi-wavelength DFB lasers with four and six wavelengths simultaneously emitted are experimentally demonstrated for the emerging optical I/O technology. The proposed structure shows high mode stability and high uniform wavelength spacing of 100 GHz.Show More
We propose and experimentally demonstrate an O-band multi-wavelength high-power DFB laser array for optical I/O technology. The proposed DFB laser array operates with 400-GHz wavelength spacing, which meets the CW-WDM MSA specifications. The reconstruction equivalent chirp technology is used to precisely control the grating phase and introduce the equivalent $\pi $ phaseshift in the laser cavity...Show More
We propose and experimentally demonstrate a novel multi-wavelength DFB laser with high mode stability and uniform spacing for the optical I/O technology. By employing the linearly chirped sampled grating and multiple equivalent π phase shifts among the cavity, the four-wavelength and six-wavelength lasers with 100 GHz spacing are implemented and experimentally validated. The proposed multi-wavelen...Show More
The ongoing growth of data traffic from existing and new latency-sensitive applications poses a challenge to the data center network. Wavelength-routed optical circuit switching promises high bandwidth, low power and latency networking for data centers, but requires a wideband wavelength tunable source capable of nanosecond-scale hitless wavelength switching at every node. A tunable source based o...Show More
Optical acceleration of neuromorphic computing has emerged as a platform for achieving low-latency and energy-efficient computation. Due to the rich dynamics, the integrated photonics architecture provides a promising way for implementations of nonlinear computing. In this article, we demonstrate pattern classification of 2 benchmark datasets, the Iris dataset and the Wisconsin Breast Cancer (WBC)...Show More
With the explosive growth of data, tensor processing has emerged as a pivotal component of the next generation of artificial intelligence (AI) algorithms. Current photonic convolutional processors transform tensor convolutions into multi-channel general matrix multiplication (GeMM), which follows the path of electronic counterparts, leading to data replication and hardware complexity. In this stud...Show More
We experimentally demonstrate a high-density monolithic integrated REC-DFB laser array chip with 100-GHz frequency spacing and less than 10 ns switching time, and a 2×2 optical switching prototype based on the chip and Arrayed Waveguide-Grating Router, achieving error-free transmission atop 25 Gbps NRZ per link with 12.8 ns end-to-end reconfiguration.Show More
Optical packet switching (OPS) networks are emerging as a promising solution to overcome the inherent bandwidth limitations of electrical switches in data center networks. However, the practical deployment of nanosecond OPS networks remains a significant challenge due to the lack of efficient optical switch control mechanisms and the difficulty in implementing efficient and fast clock and data rec...Show More
We present a four-channel ultrafast wavelength-swept distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using instantaneous injection current modulation. With the aid of our designed laser driving circuit system consists of the microcontroller unit (MCU), field-programmable gate array (FPGA) and negative metal-oxide-semiconductor field...Show More
We proposed and experimentally demonstrated a directly-modulated DFB laser array based on the reconstruction equivalent chirp (REC) technique with a transmission rate of 100 Gbps (10 channels * 10 Gbps). The proposed device is potential to be used in the DWDM systems.Show More
We develop a compact broadband tunable laser source based on REC-DFB laser array with coverage of 48 nm and adjustable power of 7-10dBm. The wavelength resolution is 2 pm, and power resolution is 0.01 dBm.Show More