| Summary: | 碩士 === 明志科技大學 === 電機工程系碩士班 === 107 === In recent years, many new technologies highly valued such as optical communication, cloud technology, smart appliances, etc. These techniques often require high bandwidth capacity in fiber-optic transmission systems. The ever-increasing mobile multimedia services need large bandwidth and high data rates, which has greatly promoted the recent development of wireless access technologies. At present, ROF technologies are the most common applications. These technologies can transmit microwave signals over long distances with high fidelity. They can effectively utilize the broad bandwidth and low transmission loss characteristics of the fiber to meet bandwidth and mobility requirements.
In this paper, an optically polarized multiplexed bidirectional transmission system is proposed. The transmitting end uses a tunable laser (TL), which is modulated by MZM via a polarizing beam splitter (PBS) and then bidirectional using a polarization beam splitter (PBC).
This paper proposes two architectures of the bidirectional transmission system. The first architecture uses two polarization beam splitter to split the signal into P-wave and S-wave, and then transmit one of the bands for long-distance transmission, and observe the signal. The second architecture uses an intensity modulator to load a 15 GHz local oscillator signal to generate an optical doubleside band signal, and then uses a fiber Bragg grating to separate the center carrier and the sub-carrier to obtain a 30 GHz RF signal and perform signal quality detection.
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