We present an analytical expression of fiber loss caused by core and cladding material losses for the TE mode of hollow-core and nonhollow-core Bragg fibers using the perturbation theory. The fiber loss agrees well with previous numerical results. Under the quarter-wave stack (QWS) condition, the expression gives the explicit dependence of the fiber loss on the fiber structural parameters, the wavelength, and the mode. The combined effect of the material with the confinement losses is also studied. It is quantitatively revealed that the core material loss affects the fiber loss much more than the cladding material losses, depending on the optical power confinement factor. The position of the minimum fiber loss corresponds well to the condition satisfying a generalized QWS condition even in the nonhollow-core Bragg fibers.
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