Fast and Robust Beam Coupling in a Three Waveguide Directional Coupler

作者：Tseng Shuo Yen^*; Jhang Yao Wun

来源：IEEE Photonics Technology Letters, 2013, 25(24): 2478-2481.

DOI：10.1109/LPT.2013.2287876

• Waveguides
• waveguide devices
• theory and design

We propose fast and robust beam coupling in a three waveguide directional coupler based on Lewis-Riesenfeld invariant theory. This method provides shortcuts to optical waveguide couplers based on coherent tunneling adiabatic passage of photons. The design and performance of directional couplers using the invariant-based inverse engineering are discussed. Beam coupling is achieved by engineering the evolution of the eigenmodes of the invariant. We show that the invariant-based inverse engineering scheme reduces coupler length as compared with the common adiabatic scheme. The device is robust against coupling coefficient variations and has broadband characteristics.

• 出版日期2013-12-15