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Long-period waveguide gratings
Proceedings of the Sixth Chinese Optoelectronics Symposium (IEEE Cat. No.03EX701), 2004Long period waveguide gratings (LPWG) based on a low-loss negative tone epoxy Novolak resin polymer have been fabricated on SiO/sub 2//Si substrate using standard cleanroom processes: UV photolithography and reactive ion etching. A maximum attenuation of -18 dB and a minimum 3 dB bandwidth of 6 nm were measured, and the grating length is as short as 1 ...
H.C. Tsoi, W.H. Wong, E.Y.B. Pun
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Long-period grating fabrication techniques
SPIE Proceedings, 2000Electric 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 +4 more
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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
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3D Printed Long Period Grating Filters
Frontiers in Optics 2016, 2016We have created affordable tunable optical fiber filters using 3D printed periodic structures acting as long fiber period grating.
Victor Lambin Iezzi +3 more
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Long-period fiber gratings based on periodic microbends
Optics Letters, 1999We 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
Hwang, IK +2 more
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Electronically reconfigurable superimposed waveguide long-period gratings
Journal of the Optical Society of America A, 2002The 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 +3 more
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Cascaded long-period gratings with nanostructured coatings
Optics Letters, 2005The 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 +3 more
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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
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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 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), 2004This 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 +5 more
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