This work presents a novel microwave photonic filter using a distributed feedback (DFB) laser. In the proposed filter, the DFB laser is modulated directly by means of the radio-frequency signal to provide a multi-wavelength laser source (MWLS). The proposed filter can thus provide precision for adjusting the central frequency. Moreover, the calculated and experimentally measured responses correlate well with each other. The above results demonstrate that the proposed filter is highly promising for use in practical applications.
This work develops an optically controllable allfiber, radio-frequency phase-shifter based on a side-polished fiber (SPF) overlaid with a photoresponsive liquid crystals (LCs). The phase shift of the LC-overlaid SPF (LCSPF) is tuned by modulating the refractive index (RI) of LC, which is determined by the phase transition of the overlaying photoresponsive LC that is formed by the trans-cis photoisomerization of doped azobenzene molecules under light illumination. All-optically controllable devices have various advantages over all-electrically controllable devices, including compactness and simplicity of design.
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