Circularly polarizing fibers with a triple-lobe stress region

Yueyu Xiao; Jinkui Yan; Lei Peng; Mingjue Tang

doi:10.3788/COL201614.110606

Journals >Chinese Optics Letters >Volume 14 >Issue 11 >Page 110606 > Article

Chinese Optics Letters
Vol. 14, Issue 11, 110606 (2016)

Circularly polarizing fibers with a triple-lobe stress region

Yueyu Xiao^*, Jinkui Yan, Lei Peng, and Mingjue Tang

Author Affiliations

Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China

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DOI: 10.3788/COL201614.110606 Cite this Article Set citation alerts

Yueyu Xiao, Jinkui Yan, Lei Peng, Mingjue Tang. Circularly polarizing fibers with a triple-lobe stress region[J]. Chinese Optics Letters, 2016, 14(11): 110606 Copy Citation Text

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Abstract

A fiber structure with a circularly polarizing property is proposed. The fiber consists of a round core and a triple-lobe stress region in the cladding, which is compatible with single-mode fibers, and it can be fabricated using conventional metal chemical vapor deposition processes. By coating a layer with a high-refractive index, the twist pitch required for resonant coupling is increased to hundreds of micrometers, and the mature pit-in-jacket drawing technique can be used. The polarization filtering properties of the fabricated circularly polarizing fibers are measured experimentally, showing high distinction ratios in a broad frequency region.

{\begin{cases} \frac{\partial a_{co} (z)}{\partial z} - γ_{co} a_{co} (z) = j a_{cl} (z) (κ_{co - cl}^{t} + κ_{co - cl}^{z}) \\ \frac{\partial a_{cl} (z)}{\partial z} - γ_{cl} a_{cl} (z) = j a_{co} (z) (κ_{co - cl}^{t} + κ_{co - cl}^{z}) \end{cases},

(1)

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κ_{co - cl}^{t} = \frac{ω}{4} \iint Δ ε {\vec{e}}_{t_co} \cdot {\vec{e}}_{t_cl}^{*} d x d y,

(2)

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κ_{co - cl}^{z} = \frac{ω}{4} \iint Δ ε e_{z_co} \cdot e_{z_cl}^{*} d x d y,

(3)

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ε (r, θ) = ε_{0} (r) + \sum_{k = 1}^{\infty} ε_{k} (r) [e^{j 3 k θ} + e^{- j 3 k θ}] .

(4)

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{\begin{cases} β_{cl} - β_{co} + 3 k k_{u} = 0 \\ m_{cl} - m_{co} - 3 k = 0 \end{cases},

(5)

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{\begin{cases} a_{co} (z) = [\cos (s z) + δ \sin (s z) / s] e^{- \frac{1}{2} α_{cl} z} \\ a_{cl} (z) = [j κ \sin (s z) / s] e^{- \frac{1}{2} α_{cl} z} \end{cases},

(6)

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T (z) = e^{- α_{cl} z} {| \cos (s z) + δ \sin (s z) / s |}^{2} .

(7)

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β_{co} - β_{cl} - 6 π / P = 0 .

(8)

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E_{out} = [E_{1}, E_{2}] [\begin{matrix} \exp (γ_{1} L) & 0 \\ 0 & \exp (γ_{2} L) \end{matrix}] [\begin{array}{l} E_{1}^{H} \\ E_{2}^{H} \end{array}] E_{in},

(9)

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J = V Σ V^{H},

(10)

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Σ = [\begin{matrix} \exp (γ_{1} L) & 0 \\ 0 & \exp (γ_{2} L) \end{matrix}] .

(11)

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η = - 20 \log_{10} (\frac{\min (| \exp (γ_{1} L) |, | \exp (γ_{2} L) |)}{\max (| \exp (γ_{1} L) |, | \exp (γ_{2} L) |)}) .

(12)

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Yueyu Xiao, Jinkui Yan, Lei Peng, Mingjue Tang. Circularly polarizing fibers with a triple-lobe stress region[J]. Chinese Optics Letters, 2016, 14(11): 110606

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