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The behavior of a temperature self-compensating, fiber, long-period grating ͑LPG͒ device is studied. This device consists of a single 325-m-period LPG recorded across two sections of a single-mode B-Ge-codoped fiber-one section bare and the other coated with a 1-m thickness of Ag. This structure generates two attenuation bands associated with the eighth and ninth cladding modes, which are spectrally close together ͑ϳ60 nm͒. The attenuation band associated with the Ag-coated section isdoi:10.1364/ao.42.003766 pmid:12868812 fatcat:5gh63om5ojcanf7yk4ldktrsry