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An improved single-mode Y-branch design for cascaded 1:2 splitters

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3 Author(s)
Klekamp, A. ; Telekom Res. Centre, Alcatel SEL, Stuttgart, Germany ; Kersten, P. ; Rehm, W.

The power splitting ratio of Y-branches based on step index waveguides has been calculated using three-dimensional (3-D) finite-difference beam propagation method (FD-BPM). Due to interference of the guided mode with quasiguided modes generated at distortions of the waveguide the splitting ratio depends on the wavelength and design parameters of the Y-branch. The simulations show how variations of the splitting ratio can be minimized using a mode-filter in the input section without significant increase of losses or component size

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Lightwave Technology, Journal of  (Volume:14 ,  Issue: 12 )