Showing papers by "Jay E. Sharping published in 2001"
TL;DR: This work reports what it believes to be the first experimental demonstration of nondegenerate four-wave mixing in a microstructure fiber and compares the experimental gain results with those predicted by theory and explores the effects of Raman shift and (or) amplification and cascaded nonlinear mixing.
Abstract: We report what we believe to be the first experimental demonstration of nondegenerate four-wave mixing in a microstructure fiber. The effect of the χ3 nonlinearity is enhanced in such a fiber because of the small core area, and we achieve phase matching by operating near the zero-dispersion wavelength ≃750 nm. We have observed parametric gains of more than 13 dB in 6.1-m-long fiber with a pump peak power of only 6 W. We compare our experimental gain results with those predicted by theory and explore the effects of Raman shift and (or) amplification and cascaded nonlinear mixing.
157 citations
TL;DR: This work reports generation of pulsed twin beams of light through optical parametric amplification in a fiber Sagnac loop and investigates the gain dependence of the quantum-noise reduction as well as of the intensity noises of the amplified signal and idler pulses.
Abstract: We report generation of pulsed twin beams of light through optical parametric amplification in a fiber Sagnac loop. By pumping the Sagnac loop with picosecond pulses at a wavelength near the zero-dispersion wavelength of the fiber, we achieve phase-matched nondegenerate four-wave mixing with gain. For a gain of 2.2, the intensity noises of the amplified signal and the generated idler (conjugate) pulses are found to be correlated by 5.0 dB, and the subtracted noise drops below the shot-noise limit by 1.1 dB (2.6 dB when corrected for losses). We have investigated the gain dependence of the quantum-noise reduction as well as of the intensity noises of the amplified signal and idler pulses. As the gain increases, we observe the onset of excess noise on the idler pulses.
90 citations
TL;DR: In this paper, a scheme for generating amplitude squeezed light by means of soliton self-phase modulation is experimentally demonstrated, and the dependence of noise reduction on the interferometer splitting ratio and fiber length is studied in detail.
Abstract: A scheme for generating amplitude squeezed light by means of soliton self-phase modulation is experimentally demonstrated. By injecting 180-fs pulses into an equivalent Mach-Zehnder fiber interferometer, a maximum noise reduction of $4.4\ifmmode\pm\else\textpm\fi{}0.3$ dB is obtained $(6.3\ifmmode\pm\else\textpm\fi{}0.6$ dB when corrected for losses). The dependence of noise reduction on the interferometer splitting ratio and fiber length is studied in detail.
36 citations
11 May 2001
TL;DR: In this article, the Sagnac geometry is "unfolded" into a Mach-Zehnder, wherein the two arms of the interferometer correspond to the polarization modes of a single-mode PM fiber.
Abstract: Summary form only given. Several schemes to generate squeezed light by use of the Kerr nonlinearity in optical fibers have been devised. The most recent experiments used asymmetric Sagnac loops to produce amplitude squeezing. In our experiment the Sagnac geometry is "unfolded" into a Mach-Zehnder, wherein the two arms of the interferometer correspond to the polarization modes of a single-mode PM fiber. This setup allows us to switch from an asymmetric to a symmetric interferometer, and gives us full control of the phase and amplitude of the two interfering pulses. With these degrees of freedom, we are able to maximize noise reduction and perform a full measurement of the noise properties of the soliton squeezed pulses.
01 Jan 2001
TL;DR: In this paper, the authors explore the potential for using microstructure fibers (MFs) in broadband optical amplifiers, wavelength shifters, and all-optical switches, and demonstrate the feasibility of using MF to perform essential functions in high-speed alloptical processing.
Abstract: Recent experimental investigations of nonlinear optics in microstructure fibers (MFs) have confirmed that one can easily observe a variety of interesting phenomena in such fibers with high efficiency. The combination of a small effective core area with single-mode waveguide behavior over a wide wavelength range and with engineerable dispersion characteristics may allow one to overcome many of the drawbacks of fiber-based devices by taking greater advantage of the relatively weak /spl chi//sup (3)/ nonlinearity of glass in MFs. We address our recent experimental investigation into the applications of nonlinear-fiber optics using MFs. In particular, we explore the potential for using MFs in broadband optical amplifiers, wavelength shifters, and all-optical switches. Our experiments demonstrate the feasibility of using MF to perform essential functions in high-speed all-optical processing.
11 May 2001
TL;DR: In this paper, the authors reported the first controlled FWM experiment in a microstructure fiber, achieving nondegenerate parametric gain based on phase-matched FWM for a pump wavelength of 782 nm.
Abstract: Summary form only given. Recently much excitement has been generated over the application of microstructure fibers (MF) in nonlinear optics. We report what we believe is the first controlled FWM experiment in a MF. We demonstrate achieving nondegenerate parametric gain based on phase-matched FWM for a pump wavelength of 782 nm, which is near the /spl lambda//sub 0/ of our microstructure fiber. Since the dispersion characteristics of these fibers can be adjusted during the fabrication process, our experiment demonstrates the potential use of MF in devices such as broadband parametric amplifiers and wavelength shifters. The final goal of our project is to demonstrate quantum correlations in beams generated through FWM in such MF in order to create a source of polarization-entangled photon pairs. Such a device operating near 800 nm could merge nicely with a rubidium based trapped-atom quantum memory.