Showing papers by "Er'el Granot published in 2005"
TL;DR: In this article, the propagation of an arbitrary initially bounded wave function is investigated and the general solution for any such function is formulated, and the exact solution can be written as an expression that depends only on the values of the function and its derivatives at the boundaries.
Abstract: A general solution to the shutter problem is presented. The propagation of an arbitrary initially bounded wave function is investigated, and the general solution for any such function is formulated. It is shown that the exact solution can be written as an expression that depends only on the values of the function (and its derivatives) at the boundaries. In particular, it is shown that at short times (t << 2mx2/, where x is the distance to the boundaries) the wave function propagation depends only on the wave function's values (or its derivatives) at the boundaries of the region. Finally, we generalize these findings to a non-singular wave function (i.e., for wave packets with finite-width boundaries) and suggest an experimental verification.
27 citations
TL;DR: In this article, a compact integrated all-optical wavelength converter based on an asymmetric Sagnac loop is demonstrated, and it is shown that a 40-Gb/s non-return-to-zero data signal can be converted over the entire C-band employing an ASGNAC loop.
Abstract: A compact integrated all-optical wavelength converter based on an asymmetric Sagnac loop is demonstrated. We show that a 40-Gb/s nonreturn-to-zero data signal can be converted over the entire C-band employing an asymmetric Sagnac loop. Compared to the back-to-back configuration, a receiver sensitivity power penalty of less then 2.1 dB is measured for both up- and down-conversion.
18 citations
TL;DR: In this paper, the authors investigated the wavelength conversion and regeneration properties of a tunable all-optical signal regenerator (TASR), which is done by a semiconductor optical amplifier, which is incorporated in an asymmetric Sagnac loop (ASL).
Abstract: In this paper we investigate the wavelength conversion and regeneration properties of a tunable all-optical signal regenerator (TASR). In the TASR, the wavelength conversion is done by a semiconductor optical amplifier, which is incorporated in an asymmetric Sagnac loop (ASL). We demonstrate both theoretically and experimentally that the ASL regenerates the incident signal's bit pattern, reduces its noise, increases the extinction ratio (which in many aspects is equivalent to noise reduction) and improves its bit-error rate. We also demonstrate the general behavior of the TASR with a numerical simulation.
17 citations
TL;DR: For the first time, to the authors' knowledge, a highly robust, high-bit-rate (10 Gbit/s) wavelength converter that is based on a narrow Brillouin filter is reported.
Abstract: For the first time, to our knowledge, a highly robust, high-bit-rate (10 Gbit/s) wavelength converter that is based on a narrow Brillouin filter is reported. The conversion takes place in a semiconductor optical amplifier (SOA) in a cross-gain–phase process. The SOA operates in a weak-modulation mode, and the exiting signal undergoes a dc reduction with a narrow spectral filter. In our system we perform spectrally narrow filtering by using a long Brillouin grating.
6 citations
TL;DR: In this article, the exact transmission coefficients of a quantum wire in the presence of a single point defect at the wire's cutoff frequencies were calculated and shown to be independent of the defect's characteristics (i.e., the defect that caused the scattering cannot be identified from that pattern).
Abstract: We calculate the exact transmission coefficients of a quantum wire in the presence of a single point defect at the wire's cutoff frequencies. We show that at these frequencies while the conductance pattern (i.e., the scattering) is strongly affected by the presence of the defect, the pattern is totally independent of the defect's characteristics (i.e., the defect that caused the scattering cannot be identified from that pattern). The change in the conduction pattern can cause universal attraction and/or repulsion forces between two parallel conducting wires.
5 citations
TL;DR: In this article, the authors investigated the operation of an all-optical wavelength converter/regenerator device, constructed from a nonlinear module and an interferometer, and proved that superior performance is obtained when the inter-ferometer does not re-invert the signal.
Abstract: We investigate the operation of an all-optical wavelength converter/regenerator device, constructed from a nonlinear module and an interferometer. Nonlinear devices based upon cross-gain and cross-phase modulation will invert an input signal, and the interferometer's operating point can be chosen to re-invert or not re-invert the signal exiting the nonlinear device. It is proven that superior performance is obtained when the interferometer does not re-invert the signal. This result concurs with experimental reports.
1 citations