Browsing by Author "Chao, Ming-I"

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Adaptively Modulated OFDM RoF Signals at 60 GHz Over Long-Reach 100-km Transmission Systems Employing Phase Noise Suppression
(2012-01-01)
Wei, Chia-Chien
;
Lin, Chun-Ting
;
Chao, Ming-I
;
Jiang, Wen-Jr
;
光電系統研究所
We experimentally demonstrated the transmission performance of orthogonal frequency-division-multiplexing (OFDM) signals in a 60-GHz radio-over-fiber system over up to 100-km standard single-mode fiber employing an adaptive bit-loading algorithm. Considering dispersion-induced phase noise, the maximum capacities after different fiber distances are investigated with and without a phase noise suppression (PNS) algorithm for the first time. When a distributed-feedback (DFB) laser with the linewidth of 1.3 similar to 4.1 MHz is modulated to carry the radio signals, the PN will result in more than 21.5% capacity decrease after 100-km fiber and 3-m wireless link, and the PNS algorithm which needs no bandwidth-consuming pilot tones can accomplish more than 15.3% capacity increase.
Long-Reach 26.54-Gbps OFDM RoF System at 60 GHz over 100-km Fiber and 3-m Wireless Transmission Employing Phase Noise Compensation and Bit-Loading Algorithms
(2011-01-01)
Wei, Chia-Chien
;
Lin, Chun-Ting
;
Chao, Ming-I
;
Jiang, Wen-Jr
;
Ho, Chun-Hung
We experimentally demonstrated 26.54-Gbps OFDM RoF signals at 60 GHz over 100km single-mode fiber and 3-m wireless transmission. After compensating dispersion-induced phase noise, adaptively modulated OFDM signals can achieve >15% capacity increment.
Phase noise suppression of optical OFDM signals in 60-GHz RoF transmission system
(2011-05-23)
Lin, Chun-Ting
;
Wei, Chia-Chien
;
Chao, Ming-I
;
光電系統研究所
;
Institute of Photonic System
The dispersion-induced phase noise (PN) in an OFDM RoF system at 60 GHz leads to not only subcarrier phase rotation (PRT) but also intercarrier interference (ICI) to severely degrade the transmission performance, when a commercial cost-effective DFB laser with the linewidth of several MHz is adopted. To mitigate both PRT and ICI, a post PN suppression algorithm is proposed, and it does not require any bandwidth-consuming pilot tone. For a 25.78-Gbps 16-QAM OFDM RoF signal using the laser with 1.8-MHz linewidth, employing the algorithm can extend the maximum transmission distance which corresponds to 3-dBm power penalty at the BER of 2 x 10 (3) from 75 km to more than 115 km, i.e. 50% increment of transmission distance. (C) 2011 Optical Society of America