Abstract
All-optical switching in long-period fiber grating (LPFG) with Ge-As-Se chalcogenide fibers was proposed. The switching performances at different resonant wavelengths and cladding modes were systematically investigated using coupled-mode theory. By utilizing the ultra-high nonlinearity of chalcogenide glass, the switching power threshold of the proposed LPFG switching at 1.55μm was 105 MW/cm2 with power coupling for the low-order LP09 cladding mode, which was approximately 200 times lower than that of silica LPFG. Furthermore, the temperature stability of the proposed LPFG switching was examined. The optical switching instability due to the laser thermal effect can be well suppressed by optimizing the cladding radius and grating period. Considering the balance between temperature sensitivity and switching power threshold, an all-optical switch with temperature sensitivity of 51pm/°C was finally realized by selecting the LP051 mode with a cladding radius of 39μm.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call