1 May 2008 A design method for a ratiometric wavelength monitor using a pair of directional couplers acting as edge filters
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Abstract
An integrated ratiometric wavelength monitor is proposed and designed, which consists of a Y-branch and two directional couplers acting as edge filters with opposite spectral responses. With a local supermodes solution, the optimal separation distance between two waveguides and the interaction length of the directional coupler are obtained to meet the desired spectral response with significantly less computation time by comparison to a parameter-space scanning method. The wavelength discrimination ability of the designed ratiometric structure is demonstrated numerically.
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A. M. Hatta, A. M. Hatta, Q. Wang, Q. Wang, G. Farrell, G. Farrell, J. Zheng, J. Zheng, } "A design method for a ratiometric wavelength monitor using a pair of directional couplers acting as edge filters", Proc. SPIE 6996, Silicon Photonics and Photonic Integrated Circuits, 69961T (1 May 2008); doi: 10.1117/12.781225; https://doi.org/10.1117/12.781225
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