17 May 2010 Compact integrated optical directional coupler with large cross section silicon waveguides
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Abstract
Compact integrated optical directional couplers with symmetrically- and asymmetrically etched S-bend waveguides on SOI platform have been designed, fabricated and characterized. We have found that the directional couplers with asymmetrically etched waveguide structures can increase the device compactness to about 4 to 5 times that of the conventional symmetrically etched bend waveguide structures without compromising much on the optical loss budgets. The over all waveguide loss and loss per S-bend have been measured to be ~ 0.5 dB/cm and ~ 1 dB, respectively. The directional couplers are found to be polarization dependent (up to ~ 2 dB) and nearly wavelength independent (1510 nm < λ < 1600 nm).
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J. P. George, N. Dasgupta, B. K. Das, "Compact integrated optical directional coupler with large cross section silicon waveguides", Proc. SPIE 7719, Silicon Photonics and Photonic Integrated Circuits II, 77191X (17 May 2010); doi: 10.1117/12.854517; https://doi.org/10.1117/12.854517
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