Impedance matching vertical optical waveguide couplers for dense high index contrast circuits
2008; Optica Publishing Group; Volume: 16; Issue: 16 Linguagem: Inglês
10.1364/oe.16.011682
ISSN1094-4087
AutoresRong Sun, Mark Beals, Andrew Pomerene, Jing Cheng, Ching-yin Hong, Lionel C. Kimerling, Jürgen Michel,
Tópico(s)Semiconductor Lasers and Optical Devices
ResumoWe designed and demonstrated a compact, high-index contrast (HIC) vertical waveguide coupler for TE single mode operation with the lowest coupling loss of 0.20 dB +/- 0.05 dB at 1550 nm. Our vertical coupler consists of a pair of vertically overlapping inverse taper structures made of SOI and amorphous silicon. The vertical coupler can suppress power oscillation observed in regular directional couplers and guarantees vertical optical impedance matching with great tolerance for fabrication and refractive index variations of the waveguide materials. The coupler furthermore shows excellent broadband coupling efficiencies between 1460 nm and 1570 nm.
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