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Effects of chirp in long period gratings
Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 1999Long period gratings (LPG) offer coherent coupling between two co-propagating modes in a fiber, and are very attractive due to their ability to shape the optical spectrum1 over large wavelength ranges.
Siddharth Ramachandran +3 more
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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
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Sensitivity characteristics in nanosized coated long period gratings
Applied Physics Letters, 2006This work presents an experimental analysis of the sensitivity characteristics to the surrounding refractive index (SRI) in long period gratings coated with polymeric overlay with high refractive index and thickness values ranging in hundreds of nanometers.
Cusano A +5 more
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Long-period waveguide grating filter with two composite gratings
Proceedings of SPIE, 2006We demonstrate LPWG in sol-gel material with replica molding and stamping technique. The grating structures were fabricated on top and bottom of the same ridge waveguide and operate at both communication wavelengths 1550 and 1310 nm respectively.
Gyong-Jin Oh +4 more
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High resolution long-period grating temperature sensor
Proceedings of the 2008 International Conference on Advanced Infocomm Technology - ICAIT '08, 2008A simple etched and packaged LPG temperature sensor for biomedical application has been developed and resolution of about 0.005°C is achieved, in comparison with conventional thermometer, which only exhibits 0.01°C. The temperature coefficient of the specially packaged LPG sensor is measured to be 3.776nm/°C, which is 15 times higher than that of the ...
L. H. Chen, Chi Chiu Chan, J. Sun
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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.
S, Savin +3 more
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Progress in long period fiber gratings
Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 2002Summary form only given. Long period fiber gratings have been used in a variety of applications such as gain equalization filters for optical amplifiers, band rejection filters and sensors for temperature and strain. Among these applications, gain equalization is the most demanding and interesting because of the impact of broadband gain-flattened EDFA ...
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Refractive index sensitivity in thinned long period gratings
SPIE Proceedings, 2007In this work, we report the exptl. investigation of the sensitivity characteristics to the surrounding refractive index (SRI) in thinned long period gratings for a wide range of fiber diams. and different low orders cladding modes. Wet chem. etching combined with microscopic anal. allow us to identify the exptl. dependence of the SRI sensitivity on the
IADICICCO, Agostino +6 more
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Fiber-optic liquid-level sensor using a long-period grating
Optics Letters, 2001Ralph P Tatam, Stephen W James
exaly
Analysis of the response of long period fiber gratings to external index of refraction
Journal of Lightwave Technology, 1998A D Kersey
exaly