Results 161 to 170 of about 120,889 (204)

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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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
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Discretized superimposed optical fiber long-period gratings

Optics Letters, 2020
A 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, Valeri Federico, Baldini Francesco   +2 more
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Reliability of long-period 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. Ever since their conception in 1996, long-period gratings (LPGs) have come to be used in a wide variety of applications. LPGs involve coupling of core and cladding modes. The importance of thermal stabilization techniques for successful use of Bragg gratings is now well acknowledged. This is even more important in LPGs, because
S. Kannan, L. Copeland, J. Judkins, M. LuValle, P. Lemaire   +4 more
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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
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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
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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.
S, Savin, M J, Digonnet, G S, Kino, H J, Shaw   +3 more
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Long-period gratings in wavelength-scale microfibers

Optics Letters, 2009
We report the fabrication of long-period gratings (LPGs) in wavelength-scale microfibers with diameters from 1.5 to 3 microm. The LPGs were fabricated by use of a femtosecond IR laser to periodically modify the surface of the fibers. These LPGs have grating periods of a few tens of micrometers, much smaller than those in conventional optical fibers.
Xuan, H, Jin, W, Liu, S
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Magnetic-force-induced long-period fiber gratings

Optics Letters, 2012
A 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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Long-period gratings in planar optical waveguides

Applied Optics, 2002
We present a theoretical analysis of light propagation in a four-layer planar waveguide that consists of a long-period grating (LPG) having a period of the order of 100 microm. By means of the coupled-mode theory, we show that such a structure is capable of coupling light from the fundamental guided mode to the cladding modes at specific wavelengths ...
Vipul, Rastogi, Kin Seng, Chiang
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