Abstract
We fabricate cascaded long-period fiber gratings (LPGs) and cascaded chirped-LPGs on all-solid silica photonic bandgap fiber (PBGF). For the cascaded LPGs, second-order resonance between the core mode and the LP01 Bloch supermode in the cladding is achieved by the first LPG, and the second LPG brings about modal interference. Compared with a fiber Mach–Zehnder interferometer based on single mode fiber, the large difference between the effective indices of the core and the guiding Bloch supermodes in PBGF achieves fringe compaction. In the same way, cascaded chirped-LPGs generate a compact wide-band comb filter in transmission spectra, and their polarization properties are also studied. A tunable multiwavelength fiber laser based on the cascaded chirped-LPGs is proposed. Experimental results show that the minimum separation of adjacent wavelengths is about 1 nm.
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