| Summary: | 碩士 === 國立成功大學 === 光電科學與工程學系 === 102 === This study investigate the photonic generation of broadly tunable microwave signals utilizing a dual beam optically injected semiconductor laser at period one nonlinear dynamics. By injecting a slave laser with one detuned master laser at the stable locking states and one detuned master laser at arbitrary states, microwave signals with frequencies corresponding to the frequency spacing of the master laser can be generated. Without the need for a microwave reference source, the dual beam optical injection scheme has the advantage of low cost and less system complexity. Moreover, without the limitation of period-doubling bifurcation and Hopf bifurcation, by utilizing the period one oscillation state with a single beam injection scheme, the microwave signals generated with the proposed scheme have a much broader tuning range. In this thesis, generation of tunable microwave signals up to 120GHz is demonstrated, which is currently limited by the locking range of the slave laser determined by the frequency difference between the Hopf and the saddle node bifurcation curve. The linewidth is 80 ~ 150 MHz and the phase noise is 17~24dB, which the master noise is considered. When the system is conformed to application of the Radio over fiber. The external modulation is used for eliminating chromatic dispersion effect, which is arose by optical fiber, the power penalty can reduce to 3dB. The linewidth is 20~50 MHz and the phase noise is down to 0~2.5dB when the injection parameter is rising.
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