Results 201 to 210 of about 5,177 (243)

Long-period fiber gratings

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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Splicer-based long-period fiber gratings

OFC '98. Optical Fiber Communication Conference and Exhibit. Technical Digest. Conference Edition. 1998 OSA Technical Digest Series Vol.2 (IEEE Cat. No.98CH36177), 2002
Summary form only given. Presents a one-step process for the fabrication of efficient, compact long-period gratings. The technique makes use ofa controlled arc to periodically modify an optical fiber by a pair of electrodes. The setup comprises a commercially available splicer whose fiber holding mechanism is replaced by a motorized stage, which allows
S.G. Kosinski, A.M. Vengsarkar
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Wavelength tunable long-period fiber grating

Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference on Communications,, 1999
Wavelength tunable long-period fiber gratings in specially designed optical fibers, which have temperature sensitivity of /spl plusmn/15 nm/100/spl deg/C, have been developed. The temperature sensitivity was three times greater than that in dispersion shifted fiber.
M. Shigehara, T. Enomoto, S. Ishikawa, M. Harumoto, H. Kanamori   +4 more
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Magnetomechanically induced long period fiber gratings

AIP Conference Proceedings, 2008
In this work, we report a simple, flexible method to create long period fiber gratings mechanically by controlling the repulsion/attraction force between two magnets that pressing a plate with a periodic array of small glass cylinders to a short length of optical fiber.
Jesus D. Causado-Buelvas, Nelson D. Gomez-Cardona, Pedro Torres, Niklaus Ursus Wetter, Jaime Frejlich   +4 more
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Dual-twist fiber long period gratings

SPIE Proceedings, 2009
Long period fiber gratings couple core and co-propagating cladding modes to produce dips in the transmission spectrum and have been widely utilized as sensors and filters. We have recently developed a new approach to long period fiber gratings utilizing optical fibers, which are uniformly twisted at elevated temperatures to produce double or single ...
Victor M. Churikov, Victor I. Kopp, A. Z. Genack   +2 more
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Nonlinear Long-Period Fiber Grating Coupler

Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 2007
The evanescent coupling dynamics between two nonlinear long-period fiber gratings has been theoretically investigated. The results of the calculations reveal intriguing phenomena that are useful for optical power combining, dividing, and optical mode converting.
Noriaki Tsukada, Kensuke Fukushima, Hiroyuki Yoshida   +2 more
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Step-changed long-period fiber gratings

IEEE Photonics Technology Letters, 2002
The spectral characteristics of a new type of long-period grating (LPG) structure, step-changed LPG, are investigated theoretically and experimentally. It is shown that the spectral profile of such gratings can be tailored by adjusting the step parameters. A good agreement between simulated results and measured spectra is obtained. This type of LPG has
Guan, BO, Zhang, AP, Tam, HY, Chan, HLW, Choy, CL, Tao, X, Demokan, S   +6 more
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Special long-period fiber grating devices

SPIE Proceedings, 2007
ABSTRACT In this paper, special long period fiber gratings with Gauss envelope and rotary refractive index modulations, as well as ultra long period fiber grating are fabricated by using the high frequency CO 2 laser pulses exposure method. The characteristics of these LPFGs are investigated by experiment. It is anticipated that these novel LPFGs would
Y. J. Rao, T. Zhu
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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
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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
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