Results 261 to 270 of about 40,614 (314)
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Nonlinear Long-Period Fiber Grating Coupler
Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 2007The 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 +2 more
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Efficient long period fiber gratings inscribed with femtosecond pulses and an amplitude mask.
Optics Letters, 2019We present efficient long period fiber gratings written with femtosecond laser pulses at 800 nm and an amplitude mask, to the best of our knowledge, for the first time.
Maximilian Heck +6 more
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Special long-period fiber grating devices
SPIE Proceedings, 2007ABSTRACT 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, 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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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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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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3D printed long period gratings for optical fibers
Optics Letters, 2016We demonstrate a simple technique for implementing long period grating (LPG) structures by the use of a 3D printer. This Letter shows a way of manipulating the mode coupling within an optical fiber by applying stress through an external 3D printed periodic structure.
Victor Lambin, Iezzi +3 more
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Femtosecond-written long-period gratings in fluoride fibers
Optics Letters, 2018Long-period gratings induced in fluoride glass fibers using femtosecond laser pulses at 800 nm are, to the best of our knowledge, demonstrated for the first time. By means of tightly confined ultrashort laser pulses, smooth periodic lines of refractive index changes are induced along the fiber core.
Maximilian, Heck +4 more
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Structural long-period gratings in photonic crystal fibers
Optics Letters, 2002We report what is believed to be the first example of structural long-period gratings written in pure silica photonic crystal fibers (PCFs). The gratings are realized by periodic collapse of the holes of the PCF by heat treatment with a CO(2) laser. The resulting periodic hole-size perturbation produces core-to-cladding-mode conversion.
G, Kakarantzas +2 more
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Long Period Fiber Gratings Inscribed by Periodically Tapering a Fiber
IEEE Photonics Technology Letters, 2014A promising technique for inscribing long period fiber gratings (LPFGs) was demonstrated by only using a commercial splicer. The commercial splicer was developed secondarily to build up a new program for periodically tapering a single mode fiber. High-quality LPFGs with a low insertion loss of ~1 dB and a large resonant attenuation of more than -30 dB ...
Guolu Yin +7 more
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