The Application of Photonic Frequency Up-conversion and Down-Conversion Technique for Radio-on-Fiber System
| Autor: | Cheng-chieh Lai, 賴政傑 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 This paper presents the up-conversion and down-conversion frequency technology in the optical domain. Generating millimeter wave frequency of traditional electronics has been a challenge so far, but we achieved the millimeter-wave signal needed with the four-wave mixing (FWM) of semiconductor optical amplifier (SOA). The millimeter-wave signal generated by this technology has the property of wider linewidth, simpler architecture, and cheaper price. Millimeter wave is suitable for small-scale transmission, broadcast, and broadband Internet signals in the future; down-technology in the optical domain can reduce the problem of fiber dispersion, eliminate the use of millimeter-wave band mixer, and control the transmission distance effectively. We proposed a millimeter wave techology generated by the four-wave mixing effect by the semiconductor optical amplifier. We used the 5.6 GHz microwave drive signal in this technology, and suppressed the carrier by the external modulators with a two-wavelength phase-related intensity. Because of the four-wave mixing of nonlinear effects in the semiconductor optical amplifier, the desired millimeter-wave signals would be produced finally; the frequency of the signal produced can be as great as 30 GHz. Two methods are proposed regarding to the Down-conversion in this paper: Mach-Zehnder modulator and (EAM), using two different signal sources, 2.4 GHzand 5 GHz,respectively;produced 200 MHz differential low-frequency signal by the first order signals from the use of two-tone modulation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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