Large-core single-mode channel waveguide based on geometrically shaped leaky cladding |
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Authors: | A Kumar V Rastogi KS Chiang |
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Institution: | (1) Department of Physics, Indian Institute of Technology Roorkee, Roorkee, 247667, India;(2) Department of Electronic Engineering and Optoelectronics Research Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P.R. China |
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Abstract: | We propose a leaky channel waveguide structure for large-mode-area single-mode operation. The proposed structure is characterized
by a uniform rectangular core and a specially designed cladding, through which all the confined modes are leaky. Single-mode
operation is ensured by choosing the waveguide parameters properly so that the differential leakage loss between the first
two modes is sufficiently high. A general power-law cladding geometry profile is considered, which is solved by the effective-index
method in conjunction with the transfer-matrix-method to obtain the effective indices and leakage losses of the modes. We
show that, with a suitable choice of cladding parameters, the waveguide can demonstrate extended single-mode operation in
the wavelength range 750–1600 nm with a core area as large as 100 μm2. Such a large confinement area for mode propagation can effectively suppress nonlinear optical effects. The waveguide is
expected to find applications in the design of high-power lasers and amplifiers.
PACS 42.82.-m; 42.82.Et; 42.79.Gn; 42.55.-f; 42.82.Bq |
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Keywords: | |
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