| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系所 === 93 === In this paper, we propose several methods to improve fiber optical CATV/radio-on-fiber (ROF) transport systems performances.
First, We proposed and demonstrated a full-duplex ROF transport system based on wavelength-division-multiplexing (WDM) and optical add-drop multiplexing techniques (OADM), as well as employed fiber Bragg grating (FBG) in combination with optical circulator (OC) as the optical single sideband (SSB)/vestigial sideband (VSB) filter at the receiving site to improve system performance. Second, a directly modulated lightwave transport system based on external light injection technique and optical SSB filter at the receiving site is proposed and demonstrated, simultaneous transmission of CATV and microwave signals. Over an 80 km SMF transport, good performances of carrier-to-noise ratio (CNR), composite second order (CSO) and composite triple beat (CTB) were obtained for CATV signals; as well as low bit error rate (BER) value was achieved for ROF applications. Third, a radio-on-hybrid WDM transport system based on distributed feedback laser diodes (DFB LDs) and semiconductor optical amplifiers (SOAs) with double external light injection techniques is proposed and demonstrated. The double external light injection techniques increases laser’s frequency response and SOA’s output saturation power, respectively. Over an 100 km SMF transport, good performances of BER, modulation error ratio (MER), CNR, error vector magnitude (EVM) and third order intermodulation distortion to carrier ratio (IMD3/C) were achieved in our proposed systems.
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