| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系所 === 94 === In this thesis, we propose external light injection technique and third-order intermodulation distortion (IMD3) suppression technique to improve radio on multimode fiber system performance.
First, a radio-on-multimode fiber (MMF) system based on 1.55μm vertical-cavity surface-emitting lasers (VCSELs) and an external light injection technique. Low error vector magnitude, third-order intermodulation distortion to carrier ratio, and bit-error-rate values were obtained. Using VCSELs as optical sources in radio-on-MMF systems are very attractive, as they are relatively simple to fabricate and potentially low cost.
Second, a full-duplex radio-on-fiber (ROF) ring network based on electroabsorption modulator (EAM) low bias voltage, RF amplifier predistorter, wavelength division multiplexing (WDM), and optical add-drop multiplexing techniques is discussed with intermodulation distortion suppression. Low third-order intermodulation distortion to carrier ratio (IMD3/C) and bit error rate (BER) values were obtained in these intermodulation distortion techniques.
Finally, a radio on multimode fiber (MMF) transport system based on 1.55 μm vertical cavity surface emitting lasers injection locked and third-order intermodulation distortion (IMD3) suppression techniques is proposed and demonstrated. Not only excellent performance of third-order intermodulation distortion to carrier ratio (IMD3/C) was achieved, but also low bit error rate (BER) was obtained. Signal quality at the receiving site meet the IEEE 802.11a demands, with a data signal of 5 GHz/54 Mb/s. Such a proposed radio on MMF transport system is suitable for the short-haul microwave optical link.
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