Long Period Fiber Grating Based Novel Optical Fiber Devices

Long Period Gratings (LPGs) in optical fibers have found wide applications as wavelength filters, sensors etc. This paper presents our recent work on superimposed LPG designs which show very interesting transmission characteristics. By appropriate design, these are expected to find applications as wavelength filters, sensors, channel isolation filters and wavelength interrogators. Adiabatic passage of light between two core modes via an intermediate cladding mode without much excitation of the cladding mode is shown as an interesting application.