27 November 2012 Coupling characteristics between fundamental mode square waveguide and fiber
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Abstract
Based on the weakly waveguide approximation, the eigen mode field distribution of fundamental mode step index square waveguide is suggested, and the overlap integral formula between two mode field distributions is employed, the expression of coupling efficiency between fundamental mode step index square waveguide and fiber is suggested. As the values of beam propagation factors of fundamental mode step index square waveguide and fiber are closed to unit in a certain range of normalized frequency, it is rational to express the mode field distributions of fundamental mode square waveguide and fiber by the Gaussian approximation in some range of normalized frequency. As the equivalent mode field size which defined by the geometric mean of second moment mode field size and differential operator mode field size is employed to express the waist sizes of Gaussian approximation for fundamental mode step index square waveguide and fiber, the coupling characteristics between fundamental mode step index square waveguide and fiber is discussed, and a useful optimum coupling condition is suggested. The conclusions would be beneficial to the assembling technology of optical waveguide device.
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Fuyuan Guo, Lianhuang Li, Hua Zheng, Yi Wang, Jinrui Ke, Tiangui Dai, Xiaoming Lin, "Coupling characteristics between fundamental mode square waveguide and fiber", Proc. SPIE 8555, Optoelectronic Devices and Integration IV, 85551H (27 November 2012); doi: 10.1117/12.2001111; https://doi.org/10.1117/12.2001111
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