High Spectral Efficiency OFDM Generation for Radio-over-fiber System with Frequency Multiplication
碩士 === 國立交通大學 === 顯示科技研究所 === 96 === This investigation presents a novel modulation approach for generating optical vector signals using frequency multiplication based on double sideband with carrier suppression. A single-electrode Mach-Zehnder modulator (MZM) is biased at null point with a driving...
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| Format: | Others |
| Language: | en_US |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/48637532577895881381 |
| Summary: | 碩士 === 國立交通大學 === 顯示科技研究所 === 96 === This investigation presents a novel modulation approach for generating optical vector signals using frequency multiplication based on double sideband with carrier suppression. A single-electrode Mach-Zehnder modulator (MZM) is biased at null point with a driving signal consists of a 10-GHz sinusoidal signal and a 5-GHz sinusoidal signal modulated with 1.25-Gb/s on-off keying (OOK), 1.25-Gb/s binary phase shift keying (BPSK) data or 625-MSym/s quadruple phase shift keying (QPSK) data. After square-law photo detection, 1.25-Gb/s RF signal at a sum frequency of 15 GHz is generated. After transmission over 50-km single mode fiber (SMF), the power penalty of all three modulation formats is under 0.2 dB. QPSK format has twice the spectral efficiency and approximately 2 dB better receiving sensitivity than OOK format. And we also demonstrate OFDM signal with wavelength reuse for uplink signal. The 5-Gb/s 16QAM OFDM signal for ROF downstream link and 1.25-Gb/s OOK signal via RSOA for upstream link are demonstrated.
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