Results 1 to 10 of about 18,792 (313)

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
openaire   +1 more source

Effects of chirp in long period gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 1999
Long 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, Jefferson Wagener, Rolando Espindola, Thomas Strasser   +3 more
openaire   +1 more source

Tunable long-period fiber grating

SPIE Proceedings, 2003
Long-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, Akira Matsumura, Junji Nishii   +2 more
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

Development of long-period fiber grating coupling devices

Applied Optics, 2008
A 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
openaire   +2 more sources

Arc-Induced Long-Period Gratings

Fiber and Integrated Optics, 2005
Abstract 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, P. V. S. MARQUES, J. L. SANTOS, H. M. SALGADO   +3 more
openaire   +1 more source

Sensitivity characteristics in nanosized coated long period gratings

Applied Physics Letters, 2006
This 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, Pilla P, IADICICCO, Agostino, CAMPOPIANO, Stefania, Giordano M, Cutolo A.   +5 more
openaire   +7 more sources

Long-period waveguide grating filter with two composite gratings

Proceedings of SPIE, 2006
We 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, Abderrafia Moujoud, Woo-Soo Kim, Byeong-Soo Bae, Sang-Yung Shin   +4 more
openaire   +1 more source

All-optical switching in long-period fiber gratings

Optics Letters, 1997
Nonlinear 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, R E, Slusher, J B, Judkins, J B, Stark, A M, Vengsarkar   +4 more
openaire   +2 more sources

High resolution long-period grating temperature sensor

Proceedings of the 2008 International Conference on Advanced Infocomm Technology - ICAIT '08, 2008
A 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
openaire   +1 more source