1.
Opt Express
; 12(1): 117-23, 2004 Jan 12.
Article
in English
| MEDLINE
| ID: mdl-19471517
ABSTRACT
We present the first systematic design approach for compact polarization-independent mode-size transformers based on tapered resonant vertical couplers with transfer efficiencies greater than 90%. Resonant coupling occurs at a critical taper width having equal TE and TM effective index. Being polarization-independent broadens the usefulness of vertical coupler as a building block for minimizing insertion loss in photonic integrated circuits.