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We demonstrated all-fiber single-channel bandpass filters formed by a high-attenuation metal-doped fiber as a core mode blocker spliced between two long-period fiber gratings (LPFGs). The LPFGs were written in dissimilar fibers, and their grating periods were adjusted so as to match the resonance wavelengths of only one pair of the same order cladding modes and also avoid matching those of other cladding...
A silica fiber and long-period gratings were heated to clarify the effect of the glass structure and the residual stress relaxations on the fiber index profile and resonance wavelengths. The profile changes were measured.
The adjustable range of resonance wavelengths of long-period gratings was broadened toward the blue side by heating, and the mechanism was studied. The large blue shift, 41 nm, was obtained by heating at 600degC.
An efficient numerical method is proposed to solve multimode-coupled equations with two points boundary conditions. This method is very applicable for simulation of any types of fiber Bragg gratings modulated by long period gratings.
An all-optical tunable filter was fabricated by acoustically induced microbending modulation in thin optical fibers. A brief theoretical discussion on the behavior of coupling core mode and higher order cladding modes and their dependence on acoustically induced long period grating (LPG) was considered to get the desired design. The theoretical design agrees well with the experimental results.
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