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In this paper, we review the recent advance on optical short reach transmission systems enabled by DSP. Our recent progress on high-speed short reach transmission systems employing advanced DSP is summarized.
Indoor visible light communication using MIMO-OFDM transmission is basically expected to be deployed along with the coming next generation solid-state lighting based on white light-emitting diodes. This paper first shows our recent proposed indoor MIMO-VLC system for multiuser application scenario. By utilizing a precoding scheme in the transmitter, an asymmetric system configuration can be setup...
Optical performance monitoring (OPM) can offer great assistances for intelligent system management of future smart optical networks. Since different optical impairments induce received electrical signal waveform distortion in different forms and degrees, analysis on electrical waveform distortion is an alternative way to monitor optical impairment by using electrical sampling technique, which takes...
The arrangement with 4 LEDs positioned in the corners and 12 LEDs spread evenly on a circle makes the fluctuation of received SNR reduce to 0.85dB. The BER performance does not suffer severely from ISI, where ZF equalization only provides 0.28dB power reduction to achieve BER of 10−3 when the receiver locates in the corner.
In this paper, we propose a chromatic dispersion (CD) monitoring technique based on fiber Bragg grating (FBG) filtering and RF power ratio measurement. This method can measure CD value without the effects of polarization-mode dispersion (PMD) and received power for non-return-to-zero (NRZ) phase-modulated signals. A narrowband FBG notch filter is placed at the optical carrier wavelength, such that...
We analytically studied the block length effect (BLE) of decision-aided maximum likelihood (DA ML) carrier phase estimation in coherent optical phase-modulated systems. The results agree well with the trends found using extensive Monte Carlo simulations. In order to eliminate the BLE and accurately recover the carrier phase, an adaptive decision-aided (DA) receiver is proposed that does not require...
We studied the impact of the bandwidth of an analog-to-digital converter (ADC) on coherent optical detection. The optimum bandwidth is found to be 0.5 times symbol rate for both RZ- and NRZ- PSK systems, different from the direct-detection counterparts.
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