Results 221 to 230 of about 8,952 (252)

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
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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
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Long-period gratings as an ASE suppressor

SPIE Proceedings, 1998
Long-period grating (LPG) is the transmission type grating, that light is coupled from the LP 01 mode to forward-propagation cladding modes LP lm , thus providing the function of wavelength dependent losses in optical fiber systems. We design a wavelength selective grating filter with transmission loss -21.2 dB at wavelength of 1531 nm, which can be ...
Yeong Her Chen, Lin-Gen Sheu, Ching Chung Yang, I-Wen Wei, Win C. Lin, Yen Zen Lee, Chung Ho Hsia   +6 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

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

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

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

Tunable mechanically induced long-period fiber gratings

Optics Letters, 2000
We 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.
M J F Digonnet
exaly   +3 more sources

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

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