Results 191 to 200 of about 5,387 (233)
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Long-period fiber grating based on inner microholes in optical fiber
Optics Letters, 2021A new, to the best of our knowledge, type of long-period fiber grating based on inner microholes in an optical fiber core is proposed and demonstrated. The device is fabricated by first using a femtosecond laser to write a series of vertical short line structures in the core of a single-mode fiber, followed by discharge of the short line areas with a ...
Falong Lan, D. N. Wang
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Ultra-long-period fiber gratings
Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551), 2002We 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 +3 more
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Discretized superimposed optical fiber long-period gratings
Optics Letters, 2020A novel technique, to the best of our knowledge, for the inscription of superimposed long-period gratings with arbitrary grating pitches is proposed and experimentally validated. The technique is based on the discretization of an ideal continuous sinusoidal refractive index (RI) pattern with a step function.
Trono Cosimo +2 more
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Magnetic-force-induced long-period fiber gratings
Optics Letters, 2012A novel formation method of a long-period fiber grating (LPFG) based on a magnetic-force-induced microbend is proposed and experimentally demonstrated. The LPFG employs a permanent magnet that exerts transversal force to the fiber by attracting a steel coil spring.
Hajime, Sakata, Kosuke, Yamahata
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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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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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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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Bending sensitivity of in-series long-period fiber gratings
Optics Letters, 1998The interference fringes formed in a long-period fiber grating pair are sensitive to the loss in the cladding mode, which can be induced by bending or by coating on the fiber. Assuming that there is no loss and that both gratings are identical, the interference fringes are shown to have 100% contrast when each grating has 50% transmissivity.
B H, Lee, J, Nishii
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Dispersion control with use of long-period fiber gratings
Journal of the Optical Society of America A, 2000Chirped long-period fiber gratings are analyzed for management of dispersion in optical fiber communications systems. A ray model is used to derive simple analytic expressions that describe the transmission, chromatic delay, and dispersion properties of chirped long-period fiber gratings. A numerical model based on coupled-mode theory is used to verify
D B, Stegall, T, Erdogan
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