DESIGN AND ANALYSIS OF DUAL SHAPE CORE LARGE-MODE-AREA LEAKY CHANNEL WAVEGUIDE FOR HIGH POWER

Abstract

We propose a leaky channel waveguide for large-mode-area extended single-mode operation. The proposed structure is characterized by specially designed guiding core and multilayer cladding. Specially designed cladding enables all the supported modes except fundamental modes leaky. Leakage loss of the higher-order mode which is key factor of single-mode operation is calculated by solving the profile by effective index method in conjunction with transfer matrix method. Dispersive cladding of the proposed design makes this design enable to show extended single mode operation in the entire wavelength range beyond 900 nm with a mode area as large as 100μm2. Such a large confinement area for mode propagation can effectively suppress non linear optical effects. The waveguide is expected to find application in the design of high power lasers and amplifiers.