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The spatial and temporal dynamics of molecular Raman coherence is experimentally and theoretically investigated using delayed probe-pump technique in hydrogen-filled hollow-core photonic crystal fiber.
We present two compact multi-line Raman-lasers based on two types of HC-PCF photonic microcells. Each discrete component of the laser exhibits high spectral power density and narrow linewidth for forensics and biomedical applications.
A delayed probe-pump technique shows the persistence of molecular coherence of rotational Raman resonance in hydrogen-filled hollow-core photonic crystal fiber over a time-scale ∼42 times longer than the dephasing time.
A monolithic integrated amplified feedback semiconductor laser is demonstrated as an optical microwave source. The optical microwave frequency is continuously tunable in the range of 19.87-26.3 GHz with extinction ratio above 6 dB, 3-dB linewidth about 3 MHz.
We present the first analysis of wideband-stimulated emission in semiconductor quantum-dot laser. Our theoretical model reveals critical occurrence of broadband lasing when the energy spacing between quantized energy states (DeltaE) is comparable to dot inhomogeneity.
We demonstrate a viable approach for ultrabroad-stimulated emission in InAs/InAlGaAs quantum-dash laser. This method involves the integration of multiple diodes with respective bandgaps tuned to different energies along a single laser cavity using postgrowth-intermixing process.
We investigate the impact of narrow-band partial optical filtering at the transmitter or receiver in 10-Gb/s directly modulated systems and double the reach from <25-km to >45-km without dispersion compensation.
We demonstrate a polarization-insensitive single-pumped optical-parametric-amplifier by depolarizing the pump using a polarization controller followed by a piece of polarization-maintaining fiber with /spl sim/ 100-ps DGD. The polarization-dependent-gain is reduced from 8 dB to <1 dB.
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