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    • 92. 发明公开
    • CHIRAL FIBER POLARIZER
    • 手性FASERPOLARISATOR
    • EP2391914A2
    • 2011-12-07
    • EP09798645.9
    • 2009-07-14
    • Chiral Photonics, Inc.
    • KOPP, Victor, Il'ichCHURIKOV, Victor, M.ZHANG, GuoyinZHANG, ShengSINGER, Jonathan
    • G02B5/30G02B6/00
    • G02B6/105G02B6/024G02B6/2726G02B2006/0209
    • A chiral optical fiber polarizer is provided that is capable of being fabricated in-line along a conventional polarization maintaining fiber, preferably one which includes at least one structure element that is external, and parallel, to the fiber's core. The novel chiral fiber polarizer is preferably positioned between two unmodified optical fiber portions, and includes a modified central portion with altered fiber cladding interface elements on each side thereof. The modified central portion is of a non-circuiar cross section, and comprises at least one diameter reduced sub-section operable to allow a light signal of said predefined operation wavelength to propagate substantially in the core and in the at least one external structure element, at least one diameter expanded sub-section operable to allow a light signal to propagate substantially in the core, each sub-section being produced in accordance with a corresponding predefined diameter reduction and expansion profile, where the modified central portion is further configured in accordance with at least one helical pitch profile that is operable to, upon receiving a light signal with a first and second linear polarization components: convert the first linear polarization component to a first elliptical polarization component white scattering the first elliptical polarization component, and convert the second linear polarization component to a second elliptical polarization component, transmit therethrough, and convert back to the second linear polarization component prior to exit therefrom. The inventive polarizer also substantially eliminates the possibility of an undesirable SBS effect.
    • 94. 发明公开
    • Polarization-dependent hollow-core optical fibers
    • PolarisationsabhängigeHohlkern-Glasfasern
    • EP2141522A1
    • 2010-01-06
    • EP09008682.8
    • 2009-07-02
    • OFS Fitel, LLC
    • Fini, John, Michael
    • G02B6/02
    • G02B6/02328G02B6/02338G02B6/02371G02B6/0239G02B6/105
    • In accordance with one aspect of my invention, the core and cladding regions of a hollow-core optical fiber arc configured so that a signal mode is coupled to a cladding mode in order to exploit polarization-dependent properties. In general, the fiber comprises a hollow-core region surrounded by a cladding region, which includes a localized hollow-waveguide region. The core and waveguide regions are configured so that the coupling between a signal mode in the core region and a cladding mode in the waveguide region are phase-matched for efficient coupling, and the phase-matching condition is made polarization-dependent to provide improved control of the fiber's polarization dependent properties. In a preferred embodiment, the cladding region comprises a bandgap structure. In one embodiment, the at least one region has a non-symmetric cross-sectional shape (e.g., oblong) with respect to one of its transverse axes. In an alternative embodiment, both the core region and the waveguide region are non-symmetric but with respect to orthogonal axes. In another embodiment, the at least one region has a multiplicity of micro-defects disposed at or near the periphery thereof and in a non-rotationally-symmetric pattern. In an alternative embodiment, both the core region and the waveguide region include a multiplicity of micro-defects at or near the periphery thereof in a non-rotationally-symmetric pattern. Optical fibers of this type find application in polarization-dependent optical couplers (e.g., splitters, polarizers) and in sensors.
    • 根据本发明的一个方面,中空芯光纤的芯和包层区被配置为使得信号模式耦合到包层模式以便利用偏振相关性质。 通常,纤维包括由包围区域围绕的中空区域,其包括局部中空波导区域。 核心和波导区域被配置为使得芯区域中的信号模式和波导区域中的包层模式之间的耦合被相位匹配以进行有效耦合,并且相位匹配条件被取决于偏振,以提供改进的控制 的纤维的偏振相关性质。 在优选实施例中,包层区域包括带隙结构。 在一个实施例中,至少一个区域相对于其横轴之一具有非对称的横截面形状(例如,长方形)。 在替代实施例中,芯区域和波导区域都是非对称的,但是相对于正交轴。 在另一个实施例中,至少一个区域具有多个微缺陷,其设置在其周边处或其周围并且以非旋转对称的图案。 在替代实施例中,芯区域和波导区域在非旋转对称图案中包括多个在其周边处或附近的微缺陷。 这种类型的光纤在偏光相关光耦合器(例如,分光器,偏振器)和传感器中得到应用。