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Development of long-period fiber grating coupling devices
Applied Optics, 2008A long-period fiber grating (LPFG) formed in a single-mode fiber is considered as an effective device to tap light from the core of fiber. This light-tapping property of the LPFG allows a new class of wavelength-selective optical couplers to be realized by using the configuration of parallel LPFGs. Over the years a number of four-port and six-port LPFG
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Arc-Induced Long-Period Gratings
Fiber and Integrated Optics, 2005Abstract The electric arc technique allows the inscription of long-period gratings (LPGs) virtually in all types of fibers, including non-photosensitive fibers, the case of non-Ge–doped photonic crystal fibers being of particular interest. LPGs written in standard fibers using this technique have shown a high thermal stability.
G. REGO +3 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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All-optical switching in long-period fiber gratings
Optics Letters, 1997Nonlinear pulse propagation in long-period fiber gratings is studied with a mode-locked Q -switched laser pulse approximately 80ps in duration at a wavelength of 1.05 microm . Optical switching, pulse reshaping, and optical limiting are found at intensities in the range of 1-20 GW/cm(2).
B J, Eggleton +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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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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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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Long-period fiber gratings as ultrafast optical differentiators
Optics Letters, 2005It is demonstrated that a single, uniform long-period fiber grating (LPFG) working in the linear regime inherently behaves as an ultrafast optical temporal differentiator. Specifically, we show that the output temporal waveform in the core mode of a LPFG providing full energy coupling into the cladding mode is proportional to the first derivative of ...
Mykola, Kulishov, José, Azaña
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