A micro light-beam spot-size converter using a hemicylindrical GRIN-slab tip with high-index contrast
- 19 December 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 23 (11) , 3821-3826
- https://doi.org/10.1109/jlt.2005.857741
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-SiO/sub x/:H is capable of coupling a narrow field, 0.5 /spl mu/m in radius at a wavelength of 1.55 /spl mu/m, to a 5.3-/spl mu/m 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-/spl mu/m radii, a thickness of 33 /spl mu/m, and a length of 35 /spl mu/m, is capable of converting a spot radius of a single-mode fiber (5.3 /spl mu/m) into a spot radius of 1.1 /spl mu/m at a wavelength of 1.55 /spl mu/m.Keywords
This publication has 12 references indexed in Scilit:
- A micro light-beam spot-size converter using a hemicylindrical GRIN-slab tip with high-index contrastJournal of Lightwave Technology, 2005
- A micro grin-slab tip for integrated coupling between superfine-core waveguides and single-mode fibersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- High density optical integrationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Fabrication and evaluation of submicron-square Si wire waveguides with spot size convertersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Spot-size converter for low-loss coupling between 0.3-μm-square Si wire waveguides and single-mode fibersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Experimental performance of silica GIO fibers with a highly elliptic coreIEEE Photonics Technology Letters, 2001
- Propagation Characteristics of Ultrahigh-Δ Optical Waveguide on Silicon-on-Insulator SubstrateJapanese Journal of Applied Physics, 2001
- Spotsize contraction in standard single-mode fibers by use of a GI-fiber tip with a high focusing parameterIEEE Photonics Technology Letters, 1998
- Poly-Si/SiO/sub 2/ laminated walk-off polarizer having a beam-splitting angle of more than 20Journal of Lightwave Technology, 1998
- Low-loss spot-size transformer by dual tapered waveguides (DTW-SST)Journal of Lightwave Technology, 1990