Results 191 to 200 of about 3,012 (236)
Some of the next articles are maybe not open access.
Tunable mechanically induced long-period fiber gratings
Optics Letters, 2000We 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.
M J F Digonnet, H J Shaw
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, 2000Chirped 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
T Erdogan
exaly +3 more sources
Bending sensitivity of in-series long-period fiber gratings
Optics Letters, 1998The 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
Optical fiber long-period grating sensors
Optics Letters, 1996We 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, A M, Vengsarkar
openaire +2 more sources
Long-period fiber grating by electrical discharge
24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), 2002Long-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 +3 more
openaire +2 more sources
Long-period fiber grating sensors
Optical Fiber Communications, OFC., 2005Summary 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 +3 more
openaire +1 more source
Tunable long-period fiber grating
SPIE Proceedings, 2003Long-period fiber grating (LPFG) having grating periodicity in the hundreds of microns, functions as a band rejection filter. This device is useful for gain equalizing applications of fiber amplifiers.The transmission characteristics are mainly determined by the initial fabricating conditions such as grating periodicity and UV exposure time. Therefore,
Hisami Nishi +2 more
openaire +1 more source
Ultra-long-period fiber gratings
Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551), 2002We 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 +3 more
openaire +1 more source
Long-period fiber grating based on inner microholes in optical fiber
Optics Letters, 2021A new, to the best of our knowledge, type of long-period fiber grating based on inner microholes in an optical fiber core is proposed and demonstrated. The device is fabricated by first using a femtosecond laser to write a series of vertical short line structures in the core of a single-mode fiber, followed by discharge of the short line areas with a ...
Falong Lan, D. N. Wang
openaire +2 more sources
Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals, 1997
Long period fiber gratings that couple light from guided core modes to non-guided cladding modes provide a means of introducing wavelength dependent losses in optical fiber systems.1 As a result, these in-fiber devices have found use as gain-equalizers in broadband optical fiber amplifiers,2 as band-rejection filters in high-power cascaded Raman fiber ...
openaire +1 more source
Long period fiber gratings that couple light from guided core modes to non-guided cladding modes provide a means of introducing wavelength dependent losses in optical fiber systems.1 As a result, these in-fiber devices have found use as gain-equalizers in broadband optical fiber amplifiers,2 as band-rejection filters in high-power cascaded Raman fiber ...
openaire +1 more source