We observe efficient forward stimulated Brillouin scattering (FSBS) in a standard 2-km highly-nonlinear optical
fiber (NHLF), where we see multiple resonance peaks between 425 MHz to 1.1 GHz. The most efficient acousto-optical
coupling appears for the 20th radially-guided acoustic mode at 933.8 MHz, which has maximum spatial
overlapping with the tightly confined optical mode in the NHLF fiber. A large gain coefficient of 34.7 W-1 is
obtained at this resonance when pumped with a 8 mW continuous-wave (cw) beam at 1550 nm, and an enhanced
gain of 57.6 is obtained by using a pulsed pump beam at 80 mW. Interference between the FSBS process and
the Kerr effect is observed to enhance the resonance and cause asymmetric profile for the observed resonances.
We study the slow light effect via stimulated Brillouin scattering (SBS) using broadly-tunable frequency-swept sources,
such as that used in optical coherence tomography. Slow light can be achieved, in principle, over the entire transparency
window of the optical fiber (many 100's of nm at telecommunication wavelengths). We demonstrate a SBS slow light
delay of more than 1 ns over a wide bandwidth at 1.55 μm using a 2-km-long highly nonlinear fiber with a source sweep
rate of 20 MHz/μs and a delay of 10 ns using a 10-m-long photonic crystal fiber with a sweep rate of 400 MHz/μs. We
also find that, for a given sweep rate R, there is an optimum value of fiber length L to obtain the largest delay.
Tapered fibers have shown high efficiency to generate white light continua, which have many important applications
such as pulse compression, spectroscopy, pump-probe measurements, and optical frequency metrology. In this paper,
we discuss the principle of white light continuum generation in tapered fibers with incident pulse durations in the
femtosecond and picosecond range. We are going to demonstrate some new technologies to design and improve the
spectral characteristics of supercontinuum generation, which make tapered fibers very convenient for the construction of
white light sources.
Tapered fibers have shown high efficiency to generate white light continua, which have many important applications such as pulse compression, spectroscopy, pump-probe measurements, and optical frequency metrology. In this paper, we discuss the principle of white light continuum generation in tapered fibers with incident pulse durations in the femtosecond and picosecond range. We are going to demonstrate some new technologies to design and improve the spectral characteristics of supercontinuum generation, which make tapered fibers very convenient for the construction of white light sources.
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