Numerical analysis of the contribution of the transverse asymmetry in the photo-induced index change profile to the birefringence of optical fiber

Dossou, Kokou B.; LaRochelle, Sophie; Fontaine, Marie

doi:10.1109/jlt.2002.800259

Cited by 46 publications

(29 citation statements)

References 15 publications

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“…Moreover, we observe a marked depolarization effect that can be attributed to the presence the UV-LPFG on the fiber core. According to this, we can infer that the exposure of the fiber to the UV light beam, used for the grating writing, creates a slight birefringence in the fiber core, a result found and reported by other authors [28][29][30][31][32]. The wavelength of resonance of the UV-LPFG occurs at 1543 nm for an unpolarized broadband white light source.…”

Section: Resultssupporting

confidence: 74%

Determination of the Mueller matrix of UV-inscribed long-period fiber grating

et al. 2014

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An explicit method for determination of the Mueller matrix elements of a commercial long-period fiber grating inscribed with ultraviolet CW laser irradiation (UV-LPFG) is presented. From the Mueller matrix obtained for such UV-LPFG, the full polarimetric response of the grating was found. Our polarimetric analysis was focused mainly on the polarization-dependent loss and other polarimetric properties, such as the polarizance, the depolarization index, and the diattenuation parameters. The full polarimetric analysis allows us to obtain more complete information than the usually reported ones, in which only two orthogonal linear polarizations are considered; for example, with our analysis, we prove that a small depolarization effect is inherent in UV-LPFG and that attenuation depends on the polarization state. This additional polarimetric information could be useful to control the output LPFG signal, for instance, for the realization of wavelength switchable or Q-switched fiber lasers, among other applications.

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Section: Resultssupporting

confidence: 74%

Determination of the Mueller matrix of UV-inscribed long-period fiber grating

et al. 2014

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“…3(c). The introduced refractive index and density variation was axially asymmetric due to the substantial attenuation of the UV light in the doped fiber [16] with a maximum at the front fiber surface, and relatively small value at the back surface. The variation of the resonance positions and their widths observed along the length of each microresonator is explained by coupling to the MF, which grows with the local amplitude of the resonant state.…”

mentioning

confidence: 99%

Surface nanoscale axial photonics: robust fabrication of high-quality-factor microresonators

Sumetsky¹,

DiGiovanni²,

Dulashko³

et al. 2011

Opt. Lett.

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Recently introduced surface nanoscale axial photonics (SNAP) makes it possible to fabricate high-Q-factor microresonators and other photonic microdevices by dramatically small deformation of the optical fiber surface. To become a practical and robust technology, the SNAP platform requires methods enabling reproducible modification of the optical fiber radius at nanoscale. In this Letter, we demonstrate superaccurate fabrication of high-Q-factor microresonators by nanoscale modification of the optical fiber radius and refractive index using CO 2 laser and UV excimer laser beam exposures. The achieved fabrication accuracy is better than 2 Å in variation of the effective fiber radius. © 2011 Optical Society of America OCIS codes: 060.2340, 140.3945, 230.3990. Surface nanoscale axial photonics (SNAP) is concerned with microscopic optical devices created by smooth and dramatically small nanoscale variation of the optical fiber radius and/or equivalent variation of its refractive index [1,2]. SNAP is based on whispering gallery modes (WGMs), which slowly propagate along the fiber axis and circulate around its surface. Unlike slow light in photonic crystals, which is introduced with the periodic modulation of the refractive index [3], the slow axial propagation of light in SNAP is insured automatically by periodic revolution around the fiber surface. The direction of light propagation considered in SNAP is primarily azimuthal so that the axial propagation is naturally slow. There is both fundamental and applied interest in the development of SNAP. The SNAP devices are fabricated of drawn silica and, hence, exhibit very small losses and high Q factors, similar to those of silica WGM microresonators [4]. In addition, the characteristic axial wavelength of these devices is much greater than the wavelength of light, which makes them convenient for investigation of fundamental properties of light, e.g., tunneling, halting by a point source, and formation of dark states [1,2]. For the same reason, a large axial wavelength simplifies accurate fabrication of high-Q-factor microresonators and other microdevices at the surface of a fiber. Typically, the SNAP photonic elements have tens of micrometer dimensions and a record small attenuation of light with a Q factor in excess of 10 6 [1,2]. This suggests SNAP as a potential platform for miniature integrated photonic circuits having attenuation of light that is orders of magnitude smaller than that in microscopic devices fabricated with the existing photonic platforms [5][6][7].This Letter solves a challenging problem of accurate and reproducible modification of the optical fiber effective radius at nanoscale, which is critical for establishing of SNAP as a practical technology. We propose and demonstrate the fabrication of high-Q-factor SNAP microresonators (Fig. 1) based on IR (CO 2 laser) and UV (248 nm excimer laser) beam exposures.In our experiments, illustrated in Fig. 2, the local perturbations of the optical fiber shape and/or refractive index introduced by the IR and ...

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“…The index difference due to photo-induced birefringence is on the order of 10 Ϫ6 [5,9]. The slightly separated transmission spectra of the two eigen polarization modes and the PDL curve are shown in Figure 1.…”

Section: Theorymentioning

confidence: 98%