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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.
The way of using Modulating Retro-Reflector (MRR) to communicate is appealing. However, in the long-range MRR communication system, the retro-reflective signal which falls off as 1/R4 is weak and difficult to be detected. In this manuscript, A novel detection mode of MRR communication based on speckle technology is proposed, which can detect small fluctuation of the light from the modulator. The novel...
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.
Analytical model is proposed to estimate EVM under the case of nonlinear noise for coherent optical fiber communications with digital receivers. Theoretical formula is obtained, which is validated by numerical simulations.
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