KEYWORDS: Signal generators, Digital signal processing, Eye, Receivers, Modulation, Signal detection, Multiplexers, Oscilloscopes, Modulators, Binary data
With the popularization of data center and other bandwidth hungry inter-connect applications, the desired capacity of short reach optical network has exponentially increased. In order to realize high-speed transmission, a few modulation formats or schemes, such as PAM4 and DMT are proposed and experimentally demonstrated. However, these modulation formats need expensive DAC and ADC as well as DSP procession. OOK modulation has simple architecture and high receiver sensitivity. Duo-binary signal is a special OOK signal. Here we experimentally demonstrate a record bit rate of 160-Gb/s OOK electrical signal generation, and realize a duobinary optical signal at a bit rate of 160Gb/s transmission and detection.
Millimeter wave (mm-wave) and microwave frequency has become a hot research topic in recent years. Comparing to traditional wireless communication frequency, microwave possesses larger available bandwidth, which is up to tens of gigahertz, so that it can support advanced digital services with ultra-high bit rate. To support the transmission rate over 100Gbit/s in an optical wireless system, forward error correction (FEC) is adopted in real-time communication systems to correct bit errors. Polar code is a kind of FEC which can theoretically achieve channel capacity as the code length tends to infinity. In this paper, we experimentally demonstrate a photonics-aided microwave communication system at K-band. With polar coding, 20-Gbit/s signal is transmitted over 20m wireless link. Our experimental results show that BER performance of such optical wireless system can be improved largely after we employ polar coding.
We experimentally demonstrate a photonics-based radio-over-fiber orthogonal-frequency-division-multiplexing (ROFOFDM) system located within the terahertz-wave (THz-wave) frequency range from 350GHz to 510GHz. In our demonstrated system, 4.46-GHz-bandwidth OFDM quadrature-phases-shift-keying (OFDM-QPSK) THz-wave signal within the frequency range from 350GHz to 510GHz, can be generated and delivered over 2.5-inch wireless transmission distance, with a bit-error ratio (BER) under the hard-decision forward-error-correction (HD-FEC) threshold of 3.8×10-3. In our demonstrated system, 4.46-GHz-bandwidth OFDM-QPSK THz-wave signal at 450GHz is delivered over up to 35-km fiber transmission distance and 2.5-inch wireless transmission distance, with a BER of 3.8×10-3.
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