Abstract
The effects of structure parameters and structural deviations on the
characteristics of photonic crystal directional couplers (PCDCs) were analyzed
through a systematic simulation study. The relationship between coupling characteristics
and structure parameters was discussed. The results reveal that the remained
power in the coupling region is detrimental to reducing the insertion loss
of PCDCs, especially for the PCDCs with shorter coupling length. An improved
structure, which increases the radii of air holes in the post coupling region,
was proposed to suppress the remained power and reduce the insertion loss
effectively. The influence of structural deviations, which is caused by fabrication
imperfections and results in the mismatch between experimental results and
theoretical predictions, was also investigated using statistical methods.
The simulation results show that the air hole position misalignment perpendicular
to the waveguide direction has the largest effect on the insertion loss of
PCDCs, and reducing $r/a$ is helpful to improving the robustness of PCDCs.
© 2009 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription