Tunable liquid crystal-photonic crystal fiber interferometer

In this work, we present a novel interferometer based on liquid crystal and photonic crystal fiber technology. The objective of this project is the development of a tunable (switchable) modal (Mach-Zehnder) interferometer for optical communications or sensing.

Photonic liquid crystal fiber intermodal interferometer

In this work, we present a novel interferometer based on liquid crystal and photonic crystal fiber technology. The objective of this project is the development of a tunable (switchable) modal (Mach-Zehnder) interferometer for optical communications or sensing. This interferometer has been manufactured splicing a short portion (between 15 and 30 mm) of photonic crystal fiber with two single mode fiber pigtails. The study shows a high sensitivity of the interferometer to the polarization of the launching light.

Mach-Zehnder interferometer based on all-fiber multimode interference device for DPSK signal demodulation

Differential Phase Shift Keying (DPSK) modulation format has been shown as a robust solution for next-generation optical transmission systems. One key device enabling such systems is the delay interferometer, converting the signal phase information into intensity modulation to be detected by the photodiodes. Usually, Mach-Zehnder interferometer (MZI) is used for demodulating DPSK signals. In this paper, we developed an MZI which is based on all-fiber Multimode Interference (MI) structure: a multimode fiber (MMF) located between two single-mode fibers (SMF) without any transition zones. The standard MZI is not very stable since the two beams go through two different paths before they recombine. In our design the two arms of the MZI are in the same fiber, which will make it less temperature-sensitive than the standard MZI. Performance of such MZI will be analyzed from transmission spectrum. Finally such all-fiber MI-based MZI (MI-MZI) is used to demodulate 10 Gbps DPSK signals. The demodulated signals are analyzed from eye diagram and bit error rate (BER).

William Pultney, earl of bath [Material gráfico] : in the collection of Lord Northnick

Resumen: Descripción: retrato de 3/4 de William Pultney sentado y de perfil

Temporally flat top pulse generation from gain switched semiconductor lasers based on a polarization interferometer with variable transfer function

We propose the use of a polarization based interferometer with variable transfer function for the generation of temporally flat top pulses from gain switched single mode semiconductor lasers. The main advantage of the presented technique is its flexibility in terms of input pulse characteristics, as pulse duration, spectral bandwidth and operating wavelength. Theoretical predictions and experimental demonstrations are presented and the proposed technique is applied to two different semiconductor laser sources emitting in the 1550 nm region. Flat top pulses are successfully obtained with input seed pulses with duration ranging from 40 ps to 100 ps.

The influence of the outer bath in the dynamics of axisymmetric liquid bridges

The main effects on the dynamics of a liquid bridge due to the presence of an outer liquid, as occur in experiments using the Plateau-tank technique, are considered. The one-dimensional nonlinear model developed here allows us to perform the computation of both breaking processes and oscillatory motions of slender liquid bridges, although in this paper only the results concerning breaking processes are reported. Additionally,the oscillatory motions are studied both experimentally and by using a new linear model. Results from both sources show good agreement

Complaint against the keeper of the bath, 1828 July 28

One draft of a letter.

Contributions for a bath in Charles' River, 1799 & 1800, 1800

Includes contribution totals from personal subscribers, individual donors, the Harvard Corporation, and the Humane Society for the construction of a bath on the Charles River. Also contains estimated costs for materials and labor.

Bath Region, England, 1744 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: An actual survey of the city of Bath, in the county of Somerset, and of five miles round : wherein are laid down all the villages, gentlemen's seats, farm houses, roads, high-ways, rivers, water courses, & all things worthy of observation, survey'd by Tho. Thorpe in the year 1742 ; engrav'd by James Cole. It was published by Thomas Thorpe, and Mr. Leake & Mr. Frederick Booksellers in 1743/4 [i.e. 1744]. Scale [ca. 1:16,300]. Covers the Bath Region, England.The image inside the map neatline is georeferenced to the surface of the earth and fit to the 'British National Grid' coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as roads, drainage, built-up areas and selected buildings, selected names of landowners, ground cover, parks, and more. Relief shown by hachures. Includes also index and a list of subscribers.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

As teorias da visão no Ocidente medieval até ao século XII: o comentário de Calcídio ao Timeu de Platão e a obra de Adelardo de Bath

A tradução do Timeu de Platão por Calcídio e respectivo Comentário, no século IV, encetou uma longa tradição no estudo da óptica durante a Idade Média, tradição esta que irá dominar até ao século XIII. O século XII, no entanto, irá ser marcado por um novo olhar neste campo, situação a que não é alheia a influência árabe que, pela mão de tradutores cristãos do ocidente, trouxe novas aportações científicas que vieram a contribuir para o desenvolvimento das correntes filosóficas sobre a matéria. Um desses tradutores foi Adelardo de Bath que, em pleno século XII, quer traduzindo obras árabes até aí desconhecidas do ocidente cristão, quer através da sua produção própria, lavrará o terreno adequado para o advento das sucessivas revoluções que a partir do século XIII surgiram neste campo.

An illustration of the Roman antiquities discovered at Bath /

Title vignette.

The Bath physicians of former times. A paper read before the Bath Literary and Philosophical Association, October 20th, 1882.

Mode of access: Internet.

Biographical sketches of Bath celebrities, ancient and modern : with some fragments of local history /

Includes index.

Bath : about and round about the "Queen City" : specially compiled for the Grand Pump Room Hotel, Bath.

Mode of access: Internet.