Long-period fibre gratingas a wavelength selective polarisation element

Kurkov, Andrei S; Douay, M.; Duhem, O.; Leleu, B.; Henninot, J. F.; Bayon, J.F.; Rivoallan, L.

doi:10.1049/el:19970422

Cited by 51 publications

(18 citation statements)

References 1 publication

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“…For example, such a device can be used as an in-line fiber polarizer [6] or a wavelength switching element in a fiber ring laser [7]. Meanwhile, different types of fibers, including polarization maintaining fibers, photonic crystal fibers, and hollow-core photonic bandgap fibers, have been used to make such devices [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Long-period fiber gratings fabricated by use of defocused CO_2 laser beam for polarization-dependent loss enhancement

Yang

Wang

2009

J. Opt. Soc. Am. B

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An alternative of the long-period fiber grating (LPFG) fabrication method has been developed in this work by use of defocused CO 2 laser pulse scanning, which is achieved by moving the laser beam focus plane slightly away from the fiber cladding surface. By increasing the distance shift from the cladding surface, the area with refractive index change also increases on the side with laser irradiation, which leads to an apparent mode field profile distortion at the resonant wavelength of the LPFG. Such a distortion in the mode field profile significantly increases the polarization-dependent loss of the LPFG. Moreover, for the cascaded LPFGs fabricated by use of this technique, the maximum polarization-dependent loss obtained can be largely increased from 7 to 17.8 dB, with a maximum dip in the wavelength change of 0.45 nm.

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Section: Introductionmentioning

confidence: 99%

Long-period fiber gratings fabricated by use of defocused CO_2 laser beam for polarization-dependent loss enhancement

Yang

Wang

2009

J. Opt. Soc. Am. B

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“…Like Bragg gratings, long-period gratings can exhibit the polarization splitting. Therefore they can be used as a polarization filter [7]. It should be noted that this method was used for a laser pumped into the core only.…”

Section: Introductionmentioning

confidence: 99%

Single-polarization cladding-pumped Yb-doped fiber laser

et al. 2007

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Yb-doped cladding-pumped fiber laser with linearly-polarized output emission was realized. To obtain linear-polarization operation we have applied Bragg grating written in the fiber with high birefringence as the input reflector. The polarization extinction ratio was of 17 dB. A maximum output power of 12 W was achieved with an efficiency slope of 69%. The laser linewidth was less than 0.1 nm even for maximum output power.

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“…A few papers have been presented concerning LPGs written in asymmetric optical fibres [7,12], which have shown red/blue wavelength shifts depending on the way the fibre is bent. There can be an additional problem of birefringence when fabricating an LPG sensor in asymmetric optical fibres, leading to polarisation dependence [15][16][17][18][19][20]. On the other hand, this polarisation dependence of the LPG can be utilised for creating polarisation filters [19,20].…”

Section: Introductionmentioning

confidence: 99%

The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber

et al. 2004

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Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d /dR, ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.

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Long-period fibre gratingas a wavelength selective polarisation element

Cited by 51 publications

References 1 publication

Long-period fiber gratings fabricated by use of defocused CO_2 laser beam for polarization-dependent loss enhancement

Long-period fiber gratings fabricated by use of defocused CO_2 laser beam for polarization-dependent loss enhancement

Single-polarization cladding-pumped Yb-doped fiber laser

The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber

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