Results 251 to 260 of about 120,968 (283)

Long-period grating fabrication techniques

SPIE Proceedings, 2000
Electric discharge and CO2 laser exposure can produce long period gratings in standard telecommunication fibers. These two fabrication techniques are examined and compared to the UV laser exposure technique. Cladding modes involved in these gratings have been measured and identified using a computer simulation based on coupled mode equations ...
Marc Verhaegen, P. Orsini, D. Perron, Xavier Daxhelet, Suzanne Lacroix   +4 more
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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, A M, Vengsarkar
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3D Printed Long Period Grating Filters

Frontiers in Optics 2016, 2016
We have created affordable tunable optical fiber filters using 3D printed periodic structures acting as long fiber period grating.
Victor Lambin Iezzi, Jean-Sébastien Boisvert, Sébastien Loranger, Raman Kashyap   +3 more
openaire   +2 more sources

Electronically reconfigurable superimposed waveguide long-period gratings

Journal of the Optical Society of America A, 2002
The perturbation to the refractive index induced by a periodic electric field from two systems of interdigitated electrodes with the electrode-finger period l is analyzed for a waveguide with an electro-optically (EO) active core-cladding. It is shown that the electric field induces two superimposed transmissive refractive-index gratings with different
Mykola, Kulishov, Xavier, Daxhelet, Mounir, Gaidi, Mohamed, Chaker   +3 more
openaire   +2 more sources

Cascaded long-period gratings with nanostructured coatings

Optics Letters, 2005
The response of the transmission spectrum of cascaded long period gratings (LPGs) to the deposition of nanostructured coatings by use of the Langmuir-Blodgett technique is investigated. The phase of the interference fringes within the LPGs' attenuation bands is shown to be highly sensitive to the optical thickness of the coating, for thicknesses of the
Stephen W, James, Imran, Ishaq, Geoffrey J, Ashwell, Ralph P, Tatam   +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

Long-period fiber gratings

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 ...
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Long-period-grating waveguide filters

2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666), 2004
This paper reports the fabrication of long period grating (LPG) filters in ion-exchanged BK7-glass waveguides and benzocyclobutene (BCB) polymer waveguides to show that LPG filters can be fabricated with different techniques and materials. The structure of corrugated LPG and its normalised transmission spectrum is analysed.
K.S. Chiang, K.P. Lor, C.K. Chow, H.P. Chan, V. Rastogi, Y.M. Chu   +5 more
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Polymeric long-period waveguide gratings

IEEE Photonics Technology Letters, 2003
A long-period waveguide grating (LPWG) was demonstrated in a polymeric waveguide fabricated on an SiO/sub 2/-Si substrate using standard cleanroom fabrication processes: ultraviolet photolithography and reactive ion etching. Experimental results confirm that the relationship between the transmission peak wavelength and the grating period is linear. The
H.C. Tsoi, W.H. Wong, E.Y.B. Pun
openaire   +1 more source

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