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Axial strain-induced effects on beating frequency from a short cavity PM-EDF based distributed Bragg reflector (DBR) laser was investigated and experimentally demonstrated for the first time. A linear strain sensitivity of 0.640 GHz/mε was obtained.
We propose a novel simple photonic approach to generate microwave signals with tunable frequency. The approach is based on beating between two highly chirped pulse-trains with relative time-delay at the photodetector (PD). We derive mathematical expressions to describe the approach and present simulation results to show that, depending on the amount of dispersion introduced in the system, the generated...
An overview of microwave photonics research for defense applications in Singapore is given. Several examples of ongoing work in this area by the Singaporean academia will also be discussed.
We proposed a dual-wavelength single-longitudinal-mode (SLM) erbium-doped fiber (EDF) ring laser, incorporating a phase-shifted chirped fiber Bragg grating (PS-CFBG) in the laser cavity. The PS-CFBG consists of a permanent phase shift and a thermo-induced temporary phase shift to form two passbands in the spectrum. The wavelength spacing of the two passbands can be continuously tuned by scanning the...
A center frequency-tunable multi-tap bandpass microwave photonic filter (MPF) is proposed and experimentally demonstrated. A specially designed multi-wavelength fiber ring laser, in which a windowed Fabry-Pérot (FP) filter is used as the wavelength selection and power control component, has been developed to serve as the optical source for the MPF. By adjusting the windowed FP filter, both the wavelength...
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