Abstract
The transmission characteristics of multiply-cascaded phase-shifted long-period fiber gratings (LPFGs) are investigated theoretically and experimentally. By including the phase-shift in the middle of a LPFG, an optical filter, such as a bandpass filter can be realized. A wavelength shift of the passband occurs as the amount of phase shift in the middle of a LPFG changes. The bandwidth of the passband in the phase-shifted LPFG is changed by increasing the number of phase-shifted LPFGs. When two -shifted LPFGs with dierent lengths of gratings are cascaded in series, the bandwidths of the rejection band and the passband can be controlled by using the pristine characteristics of two gratings. We also analyze the transmission characteristics of multiplycascaded phase-shifted LPFGs theoretically by using a transfer matrix method.
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