Showing papers on "Supercontinuum published in 1995"

200 Gbit/s, 100 km time-division-multiplexed optical transmission using supercontinuum pulses with prescaled PLL timing extraction and all-optical demultiplexing

Abstract: A single channel, single polarisation 200 Gbit/s time-division-multiplexed optical transmission experiment is successfully demonstrated using optical short pulses generated by supercontinuum. A prescaled clock is recovered directly from the 200 Gbit/s signal to drive an all-optical demultiplexer.

Multiwavelength picosecond pulse source with low jitter and high optical frequency stability based on 200 nm supercontinuum filtering

Abstract: A multiwavelength (>200 channels, 0.8 – 1 nm spacing) picosecond pulse source has been constructed that offers low jitter (< 0.3 ps) and high optical frequency stability at 6.3 GHz by filtering a 200 nm broadened supercontinuum with a 16 × 16 arrayed-waveguide grating WDM demultiplexer.

Ultrawide spectral range group-velocity dispersion measurement utilizing supercontinuum in an optical fiber pumped by a 1.5 /spl mu/m compact laser source

Abstract: Group velocity dispersion (GVD) measurement is presented utilizing supercontinuum (SC) white pulses generated in an optical fiber by 15 /spl mu/m compact laser sources. This provides 1) ultrawide continuous spectral measurement range >600 nm from a single optical source without the use of interpolation formulae and 2) stable far-end measurements by the simultaneous multi-wavelength nature of the SC pulses. A novel method that is independent of the detector bandwidth is proposed which measures /spl lambda/-dependent phase shifts of one of the Fourier components of a short pulse train. Fiber GVD's of unusual dispersion characteristics were measured using SC pulses extended over the spectral range of 1150-1770 nm. It is shown that fiber lengths of up to 130 km can be measured with a group delay resolution of 0.01 ps/km. >

Self-Phase Modulation

Abstract: This chapter considers SPM as a simple example of the non-linear optical effects that can occur in optical fibers. It is devoted to pure SPM as it neglects the GVD effects and focuses on spectral changes induced by SPM. The combined effects of GVD and SPM are discussed with emphasis on the SPM-induced frequency chirp. The chapter presents two analytic techniques and uses them to solve the NLS equation approximately. The analysis to higher-order non-linear effects such as self-steepening is also included and the chapter illustrates the SPM-broadened spectra for an unchirped Gaussian pulse and contains a graph of experimentally observed spectra for a nearly Gaussian pulse at the output of a 99-m-long fiber. The chapter summarizes that the SPM and other non-linear effects such as stimulated Raman scattering and four-wave mixing, occurring simultaneously inside optical fibers, can broaden the spectrum of an ultrashort pulse so much that it may extend over 100 nm or more. Such extreme spectral broadening is called supercontinuum, a phenomenon that has attracted considerable attention in recent years because of its potential application. Pulse spectra extending over as much as 1000 nm have been generated using the so-called highly non-linear fibers.

Penalty-free, 100 Gbit/s optical transmission of <2ps supercontinuum transform-limited pulses over 40 km

Abstract: 100 Gbit/s, < 2 ps transform-limited supercontinuum optical pulses are transmitted for the first time at three wavelengths over 40 km with less than 1 dB power penalty, maintaining a small time-bandwidth product of less than 0.2. The new source can be applied to ultrafast TDM/WDM transmission and signal processing approaching 1 Tbit/s.

Subpicosecond pulses at 2.5GHz from filtered supercontinuum in a fibre pumped by a chirp compensated gain-switched DFB laser

Abstract: Transform limited subpicosecond pulses at a repetition rate of 2.5 GHz over a tunability range of 11 nm were obtained from supercontinuum excitation in a dispersion shifted fibre pumped in the anomalous dispersion region by a chirp compensated gain-switched DFB source.

200 Gbit/s, 100 km TDM Transmission using Supercontinuum Pulses with Prescaled PLL Timing Extraction and All-Optical Demultiplexing

Abstract: New types of optical short pulse sources are now being tested in high-speed optical transmission experiments such as mode-locked fiber ring laser (ML-FRL) [1]–[4] and supercontinuum (SC) [5]. In this report we demonstrate successful 200 Gbit/s optical time-division-multiplexed (TDM) transmission experiments using 2.1 ps optical pulses generated by SC driven by ML-FRL. We confirmed successful operation of prescaled PLL timing extraction and all-optical demultiplexing at 200 Gbit/s.

Effect of nonlinear optical phenomena on retinal damage

Abstract: Recent studies of retinal damage due to ultrashort laser pulses have shown interesting behavior. Laser thresholds for retinal damage from ultrashort (i.e.

Extreme Broadening of Stimulated Raman Scattered Light from High Intensity Laser Plasma Interactions.

Abstract: : High intensity picosecond laser plasma interaction experiments were performed to examine nonlinear scattering mechanisms in field ionized underdense plasmas Broad and oscillatory spectra were observed for the forward scattered light The Raman backscattered spectrum showed an extremely broad, supercontinuum like nature, extending from 450 nm to greater than 1200 nm at incident laser intensities of 2 X 10(exp 18) W/sq cm Narrow and large amplitude modulations in the spectrum of the backscattered radiation were measured and are attributed to scattering from ion waves

Geometrization of electrodynamics and the field hypothesis of the origin of the inertial mass of matter in the supercontinuum model

Abstract: The construction of a unified geometrical description of classical gravitational and electromagnetic fields together with their sources in the model of a supercontinuum (a conformally Riemann four-space with a metric that depends on the state of the charged matter) is continued. A version of geometrization with an “interaction function,” for which the ratio ϱ/μc 2 serves, is considered. It is shown that geometrization is also possible for a zero bare mass. Expressions are found for the system's material attributes: A classical material object can be treated as an empty region of the supercontinuum with large Riemann curvatureR and dynamical curvaturer, equal in magnitude and opposite in sign. A consequence of the vanishing of the bare mass of matter is the total mutual energy compensation of gravitation and electromagnetism.