Results 261 to 270 of about 11,192,233 (306)

Optical fiber long-period grating sensors

Optics Letters, 1996
We present a novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes. Temperature, strain, and refractive-index resolutions of 0.65 degrees C, 65.75 micro, and 7.69 x 10(-5), respectively, are demonstrated for gratings fabricated in standard telecommunication ...
V Bhatia, Vikram Bhatia, Ashish M Vengsarkar   +2 more
exaly   +3 more sources

Long-period fiber-grating-based gain equalizers

Optics Letters, 1996
Long-period fiber gratings are used to f latten the gain spectrum of erbium-doped fiber amplifiers. A broadband amplifier with
P J Lemaire, A M Vengsarkar, Neal S Bergano   +2 more
exaly   +3 more sources

Long-period fiber gratings based on periodic microbends

Optics Letters, 1999
We demonstrate a new type of high-performance long-period fiber grating based on arc-induced periodic microbends. The fabrication method is simple and does not require special fibers. Flexibility in controlling the filter parameters makes it possible to produce arbitrary filter profiles by use of a simple apodization technique, which is difficult to do
Byoung-Yoon Kim, I K Hwang, In Kag Hwang
exaly   +3 more sources

Dispersion control with use of long-period fiber gratings

Journal of the Optical Society of America A: Optics and Image Science, and Vision, 2000
Chirped long-period fiber gratings are analyzed for management of dispersion in optical fiber communications systems. A ray model is used to derive simple analytic expressions that describe the transmission, chromatic delay, and dispersion properties of chirped long-period fiber gratings. A numerical model based on coupled-mode theory is used to verify
Turan Erdogan
exaly   +3 more sources

Bending sensitivity of in-series long-period fiber gratings

Optics Letters, 1998
The interference fringes formed in a long-period fiber grating pair are sensitive to the loss in the cladding mode, which can be induced by bending or by coating on the fiber. Assuming that there is no loss and that both gratings are identical, the interference fringes are shown to have 100% contrast when each grating has 50% transmissivity.
Byeong Ha Lee
exaly   +3 more sources

Tunable mechanically induced long-period fiber gratings

Optics Letters, 2000
We report the experimental characterization of mechanically induced long-period fiber gratings (LPFG's) made by pressing a plate with periodic grooves against a short length of fiber. This filter, which is simple and inexpensive, exhibits transmission spectra and temperature stability similar to those of photoinduced LPFG's.
Gordon S. Kino, M J F Digonnet, H J Shaw
exaly   +3 more sources

Long-period fiber grating by electrical discharge

24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), 2002
Long-period gratings were manufactured by applying step by step an electric discharge through a standard telecommunication fibre. The induced perturbation was so large that less than 20 steps are necessary to obtain a coupling length.
N. Godbout, X. Daxhelet, A. Maurier, S. Lacroix   +3 more
openaire   +2 more sources

Long-period fiber grating sensors

Optical Fiber Communications, OFC., 2005
Summary form only given. We propose novel long-period grating-based optical fiber sensors that possess high sensitivities and simple demodulation schemes, and can be easily configured for multiparameter measurements.
V. Bhatia, M.K. Burford, K.A. Murphy, A.M. Vengsarkar   +3 more
openaire   +1 more source

Discretized superimposed optical fiber long-period gratings

Optics Letters, 2020
A novel technique, to the best of our knowledge, for the inscription of superimposed long-period gratings with arbitrary grating pitches is proposed and experimentally validated. The technique is based on the discretization of an ideal continuous sinusoidal refractive index (RI) pattern with a step function.
Trono Cosimo, Valeri Federico, Baldini Francesco   +2 more
openaire   +3 more sources

Ultra-long-period fiber gratings

Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551), 2002
We report here for the first time the fabrication and characterisation of long period fiber gratings with periods of several millimetres. The resonant loss peaks of these gratings are generated from the coupling of the forward propagating guided core mode to the cladding modes of fundamental and harmonic orders.
null Xuewen Shu, B. Gwandu, L. Zhang, I. Bennion   +3 more
openaire   +1 more source