Title :
A lensed GIO fiber with a long working distance for the coupling between laser diodes with elliptical fields and single-mode fibers
Author :
Shiraishi, K. ; Yoda, H. ; Endo, T. ; Tomita, I.
Author_Institution :
Fac. of Eng., Utsunomiya Univ., Japan
fDate :
4/1/2004 12:00:00 AM
Abstract :
The experimental performance of a new lensed fiber employing a graded-index oval-core fiber is presented for the first time. The new scheme has a long working distance and a high coupling efficiency compared with conventional wedge-shaped lensed fibers. Experiments show that the coupling loss between a laser diode, operating at a wavelength of 980 nm with a field profile aspect ratio of 5.9, and single-mode fiber is as low as 1.3 dB with the long working distance of 30 μm. Measured tolerance characteristics against lateral displacement and tilt are acceptable for practical active alignment.
Keywords :
gradient index optics; integrated optics; lenses; optical fibre testing; optical losses; semiconductor lasers; 1.3 dB; 30 mum; 980 nm; active alignment; conventional wedge-shaped lensed fibers; coupling efficiency; coupling loss; elliptical fields; field profile aspect ratio; graded-indexed oval-core fiber; laser diodes; lateral displacement; lensed GIO fiber; long working distance; single-mode fibers; tilt; tolerance characteristics; Assembly; Diode lasers; Distributed amplifiers; Fabrication; Optical coupling; Optical fiber amplifiers; Optical fiber devices; Optical fibers; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.824629
