Abstract
We propose a novel optical planar waveguide structure for single-mode operation. The proposed structure has a uniform core and a leaky cladding. The cladding is characterized by a refractive-index profile that increases with the distance from the core. Such a structure supports leaky modes. A careful design can ensure a low leakage loss for the fundamental mode and much higher leakage losses for higher-order modes. With all the high-order modes stripped off, the waveguide supports effectively only the fundamental mode even with a large core. We introduce a class of power-law cladding profiles to demonstrate large-core single-mode operation with the structure. The effects of the profile parameters on single-mode operation are investigated by calculating the leakage losses of the first two modes using the transfer-matrix method. Owing to its large confinement area for single-mode operation, the proposed structure can suppress nonlinear effects effectively and is expected to find applications in the design of high power waveguide lasers and amplifiers.
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42.82.-m; 42.82.Et; 42.79.Gn; 42.55.-f; 42.82.Bq
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Kumar, A., Rastogi, V. & Chiang, K. Leaky optical waveguide for high power applications. Appl. Phys. B 85, 11–16 (2006). https://doi.org/10.1007/s00340-006-2425-5
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DOI: https://doi.org/10.1007/s00340-006-2425-5