Fiber Optics Research Papers - Academia.edu (original) (raw)

In recent years, several New England projects have promoted professional development and curriculum design in optics and photonics. Funded in part by the Advanced Technological Education (ATE) program of the National Science Foundation... more

In recent years, several New England projects have promoted professional development and curriculum design in optics and photonics. Funded in part by the Advanced Technological Education (ATE) program of the National Science Foundation (NSF), these projects have prepared middle and high school teachers, college faculty and career counselors from more than 100 New England institutions to introduce fiber optics, telecommunications and photonics technology education. Four of these projects will be discussed here: (1) The New England Board of Higher Education's (NEBHE) Fiber Optics Technology Education Project, (FOTEP) was designed to teach fiber optics theory and to provide laboratory experiences at the secondary and postsecondary levels. (2) Springfield Technical Community College's Northeast Center for Telecommunications Technologies (NCTT) is developing curricula and instructional materials in lightwave, networking and wireless telecommunications technologies. (3) The Harvard-Smithsonian Center for Astrophysics project ComTech developed a 12-week, hands-on curriculum and teaching strategies for middle and high school science and technology teachers in telecommunications and focused on optical communication (fiber optics). (4) NEBHE's project PHOTON is preparing middle, secondary and postsecondary instructors to introduce theory and laboratory experiences in photonics, including geometric and wave optics as well as principles of lasers and photonics applications.

This work presents a detailed review of the development of distributed acoustic sensors (DAS) and their newest scientific applications. It covers most areas of human activities, such as the engineering, material, and humanitarian... more

This work presents a detailed review of the development of distributed acoustic sensors (DAS) and their newest scientific applications. It covers most areas of human activities, such as the engineering, material, and humanitarian sciences, geophysics, culture, biology, and applied mechanics. It also provides the theoretical basis for most well-known DAS techniques and unveils the features that characterize each particular group of applications. After providing a summary of research achievements, the paper develops an initial perspective of the future work and determines the most promising DAS technologies that should be improved.

Two twelve-channel arrays based on surface-etched slot gratings, one with nonuniformly spaced slots and another with uniformly spaced slots are presented for laser operation in the O-band. A wavelength tuning range greater than 40 nm,... more

Two twelve-channel arrays based on surface-etched slot gratings, one with nonuniformly spaced slots and another with uniformly spaced slots are presented for laser operation in the O-band. A wavelength tuning range greater than 40 nm, with a side-mode suppression ratio (SMSR) > 40 dB over much of this range and output power greater than 20 mW, was obtained for the array with non-uniform slots over a temperature range of 15°C-60°C. The introduction of multiple slot periods, chosen such that there is minimal overlap among the side reflection peaks, is employed to suppress modes lasing one free spectral range (FSR) from the intended wavelength. The tuning range of the array with uniformly spaced slots, on the other hand, was found to be discontinuous due to mode-hopping to modes one FSR away from the intended lasing mode which are not adequately suppressed. Spectral linewidth was found to vary across devices with the lowest measured linewidths in the range of 2 MHz to 4 MHz.

slides about optical communication system

We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the... more

We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the available electricity supply. However, network energy consumption could grow substantially as access rates increase.

Summary form only given. Telecommunications has continued to push optical fibers towards ever-more demanding applications-such as high bit rates, dense wavelength-division multiplexing (DWDM), and long distances-and in response there has... more

Summary form only given. Telecommunications has continued to push optical fibers towards ever-more demanding applications-such as high bit rates, dense wavelength-division multiplexing (DWDM), and long distances-and in response there has been renewed interest in alternative fiber designs to lift fundamental limitations of silica fibers. A particularly exciting departure from traditional fibers are fibers based on photonic band gaps, forbidden frequency

Following the development and publication of the JCAMP-DX protocol 4.24 and its successful implementation in the field of infrared spectroscopy, data exchange without loss of information, between systems of different origin and internal... more

Following the development and publication of the JCAMP-DX protocol 4.24 and its successful implementation in the field of infrared spectroscopy, data exchange without loss of information, between systems of different origin and internal format, has become a reality. The benefits of this system-independent data transfer standard have been recognized by workers in other areas who have expressed a wish for an equivalent, compatible standard in their own fields. This publication details a protocol for the exchange of Nuclear Magnetic Resonance (NMR) spectral data without any loss of information and in a format that is compatible with all storage media and computer systems. The protocol detailed below is designed for spectral data transfer, and its use for NMR imaging data transfer has not as yet been investigated.

An economical and viable option to conventional and high rate materials is the use of fiber glass/epoxy composites, but for impact applications their toughness still has to be enhanced. The toughness and additional mechanical properties... more

An economical and viable option to
conventional and high rate materials is the use of
fiber glass/epoxy composites, but for impact
applications their toughness still has to be enhanced.
The toughness and additional mechanical properties
can be improved by using very small amount of PET
into an epoxy system. In the present work epoxy
modified by way of MMT Clay (3 wt % of Epoxy)
& PET fiber is manufactured using hand layup
system. The nano composites have been
characterized using Impact, Tensile, Bending and
Microhardness tests. The mechanical properties are
compared by means of those found for PET
introduced epoxy nano composites. The mechanical
test shows that the presence of 1 wt% PET fiber
largely increases impact strength and flexural
strength. Micro hardness decreased at PET fiber
loading.

The continuing growth of telecommunication networks is currently dominated by fiber optics (or optical networking). Optical fiber has become the guided medium of choice in telecommunications, and associated optoelectronic technologies... more

The continuing growth of telecommunication networks is currently dominated by fiber optics (or optical networking). Optical fiber has become the guided medium of choice in telecommunications, and associated optoelectronic technologies have become important such as optical fiber itself and optical amplifiers. Optical amplifiers can operate in the long distance using fiber optic carrying data and information in communication links. Some mechanisms are able to amplify electromagnetic signal corresponding to kinds of optical amplifiers. In doped fiber amplifiers and bulk laser sources, a stimulated emission in the amplifier's gain media causes amplification of incoming electromagnetic spectrum. In semiconductor optical amplifier (SOA), electron-hole interaction will occur. For Raman amplifier (RA), its scattering of incoming source with phonons in the lattice of the gain media will produce photons coherent with the incoming photons. Using the simulation, both amplifiers are simulated and compared by in-line amplifiers to allow and keep a better signal from material and geometry disturbance.

In recent years, fiber optics has found major applications in sensor technology. In this paper, we develop a theoretical analysis on different configurations of couples of fibers, in order to determine the optimal configuration for a... more

In recent years, fiber optics has found major applications in sensor technology. In this paper, we develop a theoretical analysis on different configurations of couples of fibers, in order to determine the optimal configuration for a position sensor, which allows us to measure displacements in the order of microns. This sensor is based on intensity modulated sensor and can be