KEYWORDS: Signal detection, Multimode fibers, Sampling rates, Pulse signals, Dispersion, Compressed sensing, Analog to digital converters, Reconstruction algorithms
We demonstrate the capability of the multimode fiber and photonic time-stretch based compressive sampling scheme to detect chirp radio frequency signals, with the advantages of fast speed, high accuracy, less complexity and low cost.
We propose a joint pre-compensation method based on digital resolution enhancer (DRE) and Tomlinson-Harashima precoding (THP) for low-resolution data center optical interconnect. DRE is utilized to reduce the quantization noise of the digital-to-analog converter (DAC), while THP is utilized to fall off the frequency fading caused by the system bandwidth limitation and chromatic dispersion. By combining THP and DRE, we can achieve a 112-Gb/s PAM4 system over a 40-km standard single-mode fiber with a physical number of bits (PNOB) = 4 DAC on the transmitter side Moreover, using THP in bandwidth-constrained systems can increase the transmission capacity by 26.15%.
Multimode fibers (MMFs) have been widely investigated for transmitting images due to the large number of spatial modes supported by the small core diameter. We propose an active illuminated fiber imaging system based on a MMF coupler. Without requiring the external illumination, the transmission of images and the illumination light are conducted by the same imaging fiber. In addition, we propose a new deep learning-based encoder-decoder network with a full-connected (FC) layer for the image reconstruction. We demonstrate an experiment of transmitting cell images via a 1.6 m long MMF coupler. We conduct experiment to verify the effectiveness of the active illuminated MMF imaging system. Compared with the vanilla encoder-decoder structure, the proposed network with the FC layer provides more accurate results. The proposed system allows a more compact endoscopic imaging without the external illumination.
A digital signal processing (DSP) scheme based on Volterra equalizer (VE) combined with adaptive noise-whitening post-filter and maximum likelihood sequence detection (MLSD) is proposed to mitigate nonlinear impairments in vertical-cavity surface-emitting lasers (VCSEL) multimode fiber (MMF) system. Successfully transmission of 108 Gb/s, 100 Gb/s and 60 Gb/s 4-ary pulse amplitude modulation (PAM4) signal over 5 m, 160 m and 460 m OM3-MMF is demonstrated below the 7% overhead hard-decision forward error correction (HD-FEC) bit error rate (BER) threshold by using a 20-GHz class VCSEL at 850 nm. Linear pre-equalization is applied to mitigate severe bandwidth limitation of the system. Our experimental results show that the scheme can well mitigate modulation nonlinearity induced by VCSEL and fiber nonlinearity induced by MMF. The BER decreases about two order of magnitude compared to linear equalizer after 100 m OM3-MMF transmission for 100 Gb/s PAM4 signal.
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