Full solid band-gap optical fiber with low limited loss and low bending loss

Abstract

This invention relates to all solid band gap fibers with a restricted low loss and low bending loss, which includes a core-layer and a cladding layer, the features are: the cladding materials have a refractive index n1, and the basic units with high doped materials with a refractive index n3, which locates on the regular mesh nodes of the cladding layer, and the high doping region of each basic unit are wrapped around with at least one belt region at a low refractive index n2. The invention can be widely applied in the field of photonic optical devices, for instance the fiber amplifier and fiber laser of rare earth doping, and writing for fiber grating etc.

Description

technical field [0001] The invention relates to an all-solid bandgap optical fiber, in particular to an all-solid bandgap optical fiber with low limiting loss and low bending loss, which belongs to the field of optical fiber communication and optical signal processing. Background technique [0002] Photonic Crystal Fiber (Photonic Crystal Fiber), also known as microstructure fiber or holey fiber, is a new type of fiber that has attracted widespread attention in recent years [J.C.Knight, et al.Opt.Lett., 21(1996) p.1547. ; Errata, Opt.Lett.22(1997) p.484], its cross-section has a more complex refractive index distribution, usually the cladding region of this type of fiber contains air holes that run through the entire fiber in different arrangements, these The size of the hole is roughly on the same order of magnitude as the wavelength of the fiber, and the light wave can be confined to propagate in its core region. According to different light guiding mechanisms, photonic c...

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Problems solved by technology

[0003] However, at present, for this type of optical fiber, even if the high-order bandgap with relatively low loss is used to guide light, its transmission loss is much higher than that of conventional solid optical fibers, as shown in the literature [G.Bouwmans et al.Opt.Express 13(2005) p.8452] reported a loss of about 20dB / km at 1550nm using the third-order bandgap

In addition, this type of fiber often exhibits poor bending resistance. Even if the high-order bandgap with relatively low confinement loss is used for light guiding, the loss of this type of fiber is easily affected by fiber deformation.

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