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We numerically investigate direct detection of 28- Gbps-class PAM4 signals with receiver-side digital signal processing for bandwidth-efficient short reach optical transmissions, mainly including DD-LMS based linear equalization, 3-tap noise-whitening post filter and BCJR algorithm based MAP detector.
A method to generate a monocycle UWB and doublet based on polarization modulation is proposed. Two Gaussian pulses with opposite polarity are phase-modulated to the orthogonal optical carriers with the polarization modulator (PolM). Then an appropriate group delay is introduced by polarization maintaining fiber (PMF), and a monocycle UWB is generated. The polarity of the generated monocycle UWB can...
We propose an adaptive noise whitening filter to suppress the noise enhancement caused by linear equalizers in a band-limited channel. Its adaptivity and effectiveness with MLSE are experimentally verified with a strongly-filtered 40.7-GBd regular 8QAM signal.
Broadband wireless transmission with tunable 5–40GHz carrier is demonstrated using photonic frequency conversion. The agile tuner allows ∼4 GHz of instantaneous bandwidth for both up- and down-conversion paths, without banding or channelization.
We reported a real-time single carrier 400Gb/s system with baud rate of 61GHz. The reality challenges and corresponding DSP solutions are discussed. We show back-to-back as well as propagation performance of the system.
We proposed a novel elastic optical network architecture employing Grouped Routing that enhances frequency utilization. With a developed network design algorithm, necessary fiber number was further reduced +20% compared with conventional elastic optical path network.
We demonstrate an all-electronic digital-to-analog converter (DAC) with 100-GHz electrical bandwidth sampling at 240 GS/s, based on digital bandwidth interleaving. We test the DAC by generating up to 190-GBaud Nyquist shaped pulse amplitude modulated (PAM).
Real-time transmission with 26-GBaud PAM-4 as a promising modulation format for data-center interconnects with operation in C-band is evaluated. For an OSNR penalty below 2 dB a dispersion tolerance of up to 10 km of SSMF is achieved.
We demonstrate 51.5625Gbps PAM4 transmission over ≥ 150 m next generation wide band MMF using SWDM TOSAs from 850 nm to 940 nm indicating an aggregated 206.25 Gb/s speed achievable on a single WBMMF.
We propose an upstream FDM PON architecture exploiting RSOA at the ONU, maintaining NG-PON2 standard layout with flexible bandwidth allocation. 2-Gb/s upstream transmission per user is experimentally demonstrated, targeting 128-Gb/s overall capacity.
We demonstrated 4-channel high level QAM-DMT transmission over 20-km SMF-28 with real-time reception. 58.72-Gb/s 256QAM-DMT and 56.4-Gb/s 128QAM-DMT signal transmission within 25-GHz grid is achieved with the BER under 2.4×10−2 and real-time reception.
This paper presents a closed-loop optogenetic stimulation device to achieve online modulation of neurons. The device is designed to be mountable on small rodents in pre-clinical settings. Considering the size of rodents and the need for portability, a single-piece self-contained device is developed which allows real-time photostimulation based on detected neuronal states. It consists of three components:...
Planar chial meta-surface (PCM) is a class of meta-materials, consisted of a two dimensional surface grating with a chiral-shaped pattern in its unitcell. It has been reported that appropriate choice of film materials and the shape of chiral pattern made it possible to induce giant optical activity (polarization rotation) [1]. In this study we focused on Si/Si3N4/SiO2 PCM and investigated its potential...
Modern radar will be reconfigurable and programmable at multi-band central frequency with considerable bandwidth agility. We introduce an all-optical central-frequency-programmable and bandwidth-tailorable radar architecture that was newly proposed. It provides a coherent system by one mode-locked laser for both signal generation and reception. Heterodyning of two individually-filtered pre-chirped...
In this paper, an indoor optical wireless CDMA system based on zero cross correlation (ZCC) code is investigated under the influence of ambient light noise. We consider line of sight communication links between multiple emitters and receivers. We first establish an analytical expression of bit error rate and then validate its estimations with the simulated results. The finding results show a great...
Ultra-broadband absorption has always been the pursuit of the goal in the field of metamaterial absorbers(MAs). While the only requirement for the absorption bandwidth is not integrated. In this paper, we demonstrate that the directional selectivity with high-effective and broadband absorption of transverse magnetic(TM) wave can be designed by introducing a three-dimensional(3D) structure into the...
Circuit-based optical networks have the potential to provide end-to-end dedicated channels with flexible data rates between edge node pairs. However, the data-rate granularity of spectral-slicing in the optical domain based on wavelength-selective switch (WSS) is limited by the optical filter frequency selectivity. Digital subcarrier multiplexing (DSCM) in the electrical domain is able to provide...
In recent years, the concept of the elastic optical network (EON) was proposed and very quickly became an attractive solution for flexible channel bandwidth utilization. Analogous to the routing and wavelength assignment (RWA) problem in traditional wavelength-routed networks, routing and spectrum assignment (RSA) is the most basic and critical resource management issue in EONs. In this work, we exploit...
Next-generation access networks (NGANs) mainly include wavelength division multiplexing (WDM) based 60GHz Radio over Fibre systems (60G-RoF) and WDM Passive Optical Networks (WDM-PONs). Semiconductor optical amplifier may be the key device of colorless unit in these WDM based systems. The device can be effectively utilized as external modulator because it can perform simultaneously amplification and...
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