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Fabrication of long period fiber gratings of subnanometric bandwidth [PDF]
Optics Letters, 2017 This Letter reports on the fabrication of long period fiber gratings having subnanometric bandwidths in the 1500 nm spectral region. Large gratings have been photo inscribed in a high NA fiber; the grating pitch and the order of the HE cladding mode are optimized to produce gratings with a large number of periods and prevent the coupling to TE, TM, or ...
J L Cruz +2 more
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Scaling the performances of integrated long period grating refractometers
Optics Letters, 2022In this Letter, a theoretical analysis and design methodology of integrated long period gratings (LPGs) for refractometric applications are proposed. A detailed parametric analysis is applied to a LPG model based on two strip waveguides to highlight the main design variables and their effect on the refractometric performances, with focus on the ...
Deleau, Clement +3 more
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Long-period fiber grating sensors
Optical Fiber Communications, OFC., 2005Summary 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 +3 more
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Polymeric long-period waveguide gratings
IEEE Photonics Technology Letters, 2003A 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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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.
M J F Digonnet, H J Shaw
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Long-period gratings as an ASE suppressor
SPIE Proceedings, 1998Long-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 +6 more
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Long-period-grating waveguide filters
2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666), 2004This 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 +5 more
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Effects of chirp in long period gratings
Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 1999Long 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 +3 more
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Tunable long-period fiber grating
SPIE Proceedings, 2003Long-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 +2 more
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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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