Loss Characteristics of Single-HE11 -Mode Bragg Fiber

The loss characteristics of two kinds of typical single-HE₁₁ -mode Bragg fibers based on PES/As₂Se₃ and Si/SiO₂- multilayer claddings are analyzed theoretically. The available lowest loss levels and corresponding structure parameters of the two single-HE₁₁-mode Bragg fiber are optimized to show the feasibility of the low-loss single-HE₁₁-mode Bragg fiber design under the two material systems. The influences of structure parameters on the loss characteristics are analyzed in detail. For PES/As₂Se₃ Bragg fiber, a loss level as high as 10 ⁵-10⁷ dB/km is expected at wavelengths from 0.85 to 2.94 mum due to the large absorption loss. To extend the limitation, lower loss cladding material should be investigated. For Si/SiO₂ Bragg fiber, low-loss single- HE₁₁-mode propagation can be achieved by the materials if fabrication improvement can support long fabricated fiber length