Abstract
A simple light-beam spot-size converter (SSC) using a microscale graded-index (GRIN)-slab tip with a hemicylindrical endface for efficient coupling between a single-mode fiber and a fine-core waveguide is reported. Numerical examples based on the finite-difference time-domain (FDTD) method have shown that the tip made of a -SiOx:H is capable of coupling a narrow field, 0.5 µm in radius at a wavelength of 1.55 µm, to a 5.3-µm radius standard single-mode fiber with a coupling loss as low as 0.07 dB. A micro GRIN slab with an index difference of as much as 34% was successfully fabricated. It has been confirmed experimentally that a GRIN slab with a hemicylindrical endface of 27-µm radii, a thickness of 33 µm, and a length of 35 µm, is capable of converting a spot radius of a single-mode fiber (5.3 µm) into a spot radius of 1.1 µm at a wavelength of 1.55 µm.
© 2005 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