A Ratiometric Wavelength Measurement Based on a Silicon-on-Insulator Directional Coupler Integrated Device

Sensors
Pengfei WangGilberto Brambilla

Abstract

A ratiometric wavelength measurement based on a Silicon-on-Insulator (SOI) integrated device is proposed and designed, which consists of directional couplers acting as two edge filters with opposite spectral responses. The optimal separation distance between two parallel silicon waveguides and the interaction length of the directional coupler are designed to meet the desired spectral response by using local supermodes. The wavelength discrimination ability of the designed ratiometric structure is demonstrated by a beam propagation method numerically and then is verified experimentally. The experimental results have shown a general agreement with the theoretical models. The ratiometric wavelength system demonstrates a resolution of better than 50 pm at a wavelength around 1550 nm with ease of assembly and calibration.

References

May 27, 2006·Optics Letters·Qian WangPengfei Wang
Sep 7, 2007·Applied Optics·Qian WangGerald Farrell
Sep 1, 1984·Optics Letters·G L Yip, J Finak
May 31, 2014·Optics Letters·Bing YangJianyi Yang

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