| Summary: | 博士 === 國立交通大學 === 光電工程學系 === 99 === With the rapidly developing of technologies, optical millimeter-wave signal generation attracts a lot of interests for various kinds of applications. Not only in broadband wireless communication systems, but high frequency millimeter-wave signals can be utilized in radar, car anti-collision system, radio astronomy and imaging. However, millimeter-wave signal generation and transmission still remain great challenges due to the high propagation loss in air and in copper cables. Based on the extremely
low loss of the optical fiber, generation of optical millimeter-wave signal with frequency multiplication attracts a lot of attentions.
In this dissertation, optical millimeter-wave signal generation with frequency quadrupling, octupling and 12-tupling are proposed, theoretically analyzed and experimentally demonstrated. Optical millimeter-wave signals with ultra-high frequencies and high undesired optical sideband suppression ratios can be generated using
low-frequency optical modulator, components and equipments. Because the high undesired optical sideband suppression ratios, high purity millimeter-wave signals can be generated and suitable for various kind of millimeter-wave applications.
Based on the optical millimeter-wave signal generation and up-conversion systems, 60-GHz radio-over-fiber (RoF) system which provides wireless transmission with multi-Gbps data-rate can be achieved. A asymmetrical full-duplex bidirectional RoF system based on tandem-single-sideband (TSSB) modulation technique, and an optical up-conversion system with frequency sextupling for 60-GHz RoF links are proposed. Transmission of 25-km standard single mode fibers can be achieved without significant receiver power penalties.
A 2 × 21-Gbps symmetrical bidirectional full-duplex system at 60 GHz based on intensity modulation direct detection (IMDD) technique which is a very simple architecture is also proposed. Although chromatic dispersion induced performance fading issues are observed in the IMDD systems due to the double-sideband (DSB) modulation scheme, 500-m fiber transmission and 10-m wireless transmission with
acceptable receiver power penalties can be achieved without any dispersion compensation. Based on the very simple architectures and fully transparent characteristic of the bidirectional IMDD systems, the proposed systems are ideal for in-building high data-rate wireless applications, which are characterized by short fiber spans.
Multi-service hybrid access networks which supports both RoF and fiber to the x (FTTx) systems attract a lot of interests. Two multi-service hybrid access network systems which simultaneously generate and transmit radio frequency (RF) M-array phase shift keying (PSK) signal and baseband (BB) On-Off-keying (OOK) signal are proposed and experimentally demonstrated. The wired BB signal is compatible with the existing passive optical network (PON) system, and the wireless RF PSK signal can also share the same distributed infrastructure. No dispersion induced fading issues are expected and no narrow band optical filter is needed at the remote nodes in the proposed systems. After transmission over 25-km standard single mode fiber, no significant receiver power penalties are observed in both RF and BB channels in the proposed systems.
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