Demonstration of coupling to symmetric and antisymmetric cladding modes in arc-induced long-period fiber gratings

Gaspar Rego, Oleg V. Ivanov, Paulo V. S. Marques
2006 Optics Express  
The symmetry of cladding modes excited in microbend and arcinduced long-period fiber gratings is investigated. An optimization technique is developed to determine the fiber parameters and to associate grating resonances with cladding modes of a particular symmetry. Using this optimization procedure, we show that the gratings induced in a standard fiber by arc discharges and microbends couple light to the antisymmetric cladding modes. In the case of a boron-germanium codoped fiber, the cladding
more » ... odes excited by arc-induced gratings are found to be symmetric. Measurements of the near-field intensity distribution of cladding modes confirm the mode symmetry ascertained by the optimization technique.
doi:10.1364/oe.14.009594 pmid:19529349 fatcat:zc3f22jqlfbzxjqxkk2wp3i5ga