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We demonstrate integrated silicon-on-insulator (SOI) spiral waveguides with record-high 2.6-ns/mm2 on-chip delay efficiency performing as delay bank stage in variable optical delay buffering and time-slot interchanger applications with 10-Gb/s optical packets. The micro-scale SOI chip comprises three integrated waveguide delay elements of different lengths, providing variable delays of 6.5, 11.3,...
This paper describes the complete dimensioning of a method and apparatus dedicated to the automatic detection of defects on optical mirror-like components called optical solar reflector (OSR), which are used to ensure the thermal control of satellites. First, the requirements of the method are defined according to the properties of the OSR (multilayer and semitransparent) and the defects to be detected...
Photonic reservoir computing is a recent bio- inspired paradigm for signal processing. Despite first successes, the paradigm still faces challenges. We address some of these challenges and introduce our approaches to solve them. In detail, we discuss how integrated reservoirs can be scaled up by injecting multiple copies of the input. Further we introduce a new hardware-friendly training method for...
We investigate theoretically and experimentally the factors to influence on the core height when the Mosquito method is applied. Using the simulation analysis, we find a correction method to align the core height accurately.
A 25.78-Gbit/s × 4-ch active optical cable (AOC) with a ultra-compact form factor is proposed. The size of the proposed AOC is 5.2 cm3, which is 45-% smaller than the standard form factor of a pQSFP. By utilizing a gapped ground electrode structure, the proposed AOC demonstrated 25.78-Gbit/s error-free optical transmission under all-channels (4-ch) operation, and improved bit error rate (BER) power...
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.
In this paper, we show the remarkable timing error (TE) and residual chromatic dispersion (CD) tolerance improvements of the filte bank multicarrier (FBMC) over orthogonal frequency division multiplexing (OFDM) for high-baudrate spectral slicing transmitter and single coherent receiver transmissions. For a 512 Gb/s 16 quadrature amplitude modulated (16QAM) spectrum slicing system at 1600 km of fibe...
In this paper we demonstrate the 4 level pulse amplitude modulation (PAM-4) signal generation through a silicon Mach-Zehnder modulator. The baud speed of the PAM-4 signal generation is characterized up to 32 Gbaud (64Gb/s). And we have measured the device's bit error rate (BER) up to 32 Gbaud and the spurious free dynamic range (SFDR) of the distortion component of the modulated light.
Single event effect susceptibility of industrial MCUs and key drive chips of several commercial transceivers are studied based on heavy ions and pulse laser methods. Based on the testing results, the performance of receive chips are better than transmit chips or transceiver chips, and the threshold values of transmit chips or transceiver chips are between 30 and 37MeV.cm2/mg. However, the MCUs are...
In this paper, we propose a novel sampling frequency offset estimation algorithm to improve the performance of the practical intensity-modulation and direction-detection (IMDD)-based OFDM system. For this scheme, only OFDM symbol is used, which reduce the complexity of implement in practical system. And, by taking the relationship of phase rotating of subcarriers into account, we successfully estimate...
We experimentally demonstrate the high-speed free-space optical (FSO) transmission over 1 km using 20 Gbit/s advanced coherent quadrature phase-shift keying (QPSK) signals. The constellation diagram and the bit error rate (BER) are measured. The receiving sensitivity of the FSO transmission is about −23.9 dBm at the BER of 3.3×10−3.
We researched the performance of the aspheric lens as the receiving antenna of the indoor Visible Light Communication and got the different results with the lens placed in different situations. We use channel gain curves to describe the relationship between the Field-of-View and the optical gain of the receiving antenna. The experiment shows that the aspheric lens can provide a 15dB optical gain and...
A pulse amplitude modulation with 4 levels (PAM-4), generated by optical superimposition, is first proposed and experimentally demonstrated for visible light communication (VLC). It can overcome the shortcomings of the PAM-4 signals generated in the electrical domain, with enhanced tolerance to the modulation nonlinearities of a light emitting diode (LED). A proof-of-concept experiment employing two...
A novel broadband and scalable RF switch matrix based on microwave photonics is proposed and the proof-of-concept experiments are carried out. The experiment results show that the proposed RF switch matrix is with a good linearity, link gain, port isolation and EVM performance.
We investigate the impact of optical filtering from routing nodes in optical networks, and how to predict it. From measurements in presence of tight optical filtering, we propose a new method relying on an extended back-to-back model for improved prediction of the quality of transmission.
White LED diodes are increasingly used. Thanks their features they are also used for illumination and gradually replace the classical light bulbs and fluorescent tubes. The one of advantages of white LED diodes is their availability for the Visible Light Communication. This article deals with study of suitable placing of light sources for indoor. The aim is a uniform light distribution and thereby...
Electro optical techniques including EOFM (Electro Optical Frequency Mapping) and EOP (Electro Optical Probe) are common dynamic optical probing techniques used during failure analysis. This paper demonstrated two real cases to show the application of these techniques on the fault isolation of high resistive vias.
This work discusses visible light laser voltage probing (VIS-LVP) and gallium phosphide solid immersion lens (GaP SIL) research for Integrated Circuit (IC) analysis at Technische Universität Berlin. An overview of the challenges in connection with the ultra-precision fabrication of GaP SILs and their application is given. The use of visible light is not only opening a path for fault isolation in small...
A 25.78-Gbit/s × 4-ch active optical cable (AOC) with a ultra-compact form factor is proposed. The size of the proposed AOC is 5.2 cm3, which is 45-% smaller than standard form factor of a μQSFP. By utilizing a high heat-dissipation structure, the proposed AOC demonstrated 25.78-Gbit/s error-free optical transmission under all-channels (4-ch) operation at case temperature (Tc) of 70 °C.
Prediction of sea ice motion is important for ocean-atmosphere interaction modeling and safe naval operations in polar regions. In this study, we investigate the potential of Recurrent Neural Networks (RNNs) in predictions of motion for several days in the future based only on previously observed satellite image data. We collect a large dataset of daily Advanced Microwave Scanning Radiometer — Earth...
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