A novel optoelectronic oscillator utilizing high-Q active ring resonator based on semiconductor optical amplifier and optical filter is proposed and demonstrated. The ring resonator with high Q-factor can reduce the dissipation of energy in the feedback loop to achieve oscillation with low phase noise. A high-quality microwave signal with a frequency tunable from 8 to 12 GHz is generated by employing a commercial tunable electrical bandpass filter. The single-sideband phase noise of the generated 10-GHz signal is measured to be -124 dBc/Hz at 10 kHz.
We report a liquid-level variation sensor based on a fiber Bragg grating (FBG) inscribed in a 6.5-μmdiameter
microfiber. The proposed microfiber Bragg grating (MFBG) in air has two separated reflection
peaks, which are caused by the fundamental mode reflection and the higher-order mode reflection. Each of
the two peaks will split into another two adjacent peaks when a fraction of the MFBG sensor immerses into
liquid. By measuring the reflectivity difference between the two original peaks and their respective adjacent
liquid-induced peaks, the liquid-level variation can be determined.
We experimentally demonstrate all-optical clock recovery (CR) from the nonreturn-to-zero (NRZ) data without any
preprocess measure. Multi-quantum-well (MQW) Fabry-Pérot semiconductor optical amplifier (FP-SOA) plays the dual
role of the data format converter and the clock recovery device. To achieve amplitude equalization of the recovered clock
pulses, a self-nonlinear polarization switching (SNPS) including the FP-SOA itself, two polarization controllers (PCs)
and a polarization beam splitter (PBS) is employed. Using the presented scheme, stable and low jitter 35.80 GHz optical
clock pulses were directly extracted out from input NRZ data. This scheme has some distinct advantages such as being
transparent to data format, free preprocess, free pre-amplification, convenient tuning, good tolerance to long "0s" data,
and good tolerance to wavelength drifting of input data.
A measurement of carrier recovery time in semiconductor optical amplifiers (SOAs) based on dual pumps four-wave
mixing (FWM) is presented. The results show the carrier time is 91 ps, 79 ps and 63 ps at 120 mA, 180 mA and 240 mA,
respectively, which agree to our expectation. The experimental results show the conversion efficiency keeps constant
when the spacing of the two pumps varies within a small range.
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