Title :
A new scheme of a lensed fiber employing a wedge-shaped graded-index fiber tip for the coupling between high-power laser diodes and single-mode fibers
Author :
Yoda, Hidehiko ; Shiraishi, Kazuo
Author_Institution :
Fac. of Eng., Utsunomiya Univ., Japan
fDate :
12/1/2001 12:00:00 AM
Abstract :
A novel lensed fiber employing a wedge-shaped graded-index fiber (GIF) is proposed. The characteristic of coupling loss as a function of the aspect ratio is numerically investigated. When the aspect ratio is seven, the coupling loss of a wedge-shaped GIF and a conventional wedge-shaped SMF are 0.22 dB and 0.60 dB, respectively, and when the aspect ratio is 13, they are 0.5 dB and 2.4 dB. The tolerance to laser diode (LD)-fiber displacement is also numerically investigated, and it is confirmed that the proposed fiber has larger tolerance than a conventional wedge-shaped single-mode fiber (SMF). The performance of the new lensed fiber is also experimentally verified
Keywords :
gradient index optics; lenses; optical fibre couplers; optical fibre losses; semiconductor lasers; 0.22 dB; 0.5 dB; 0.60 dB; 2.4 dB; LD-fiber displacement tolerance; aspect ratio; conventional wedge-shaped SMF; coupling; coupling loss; high-power laser diodes; lensed fiber; single-mode fibers; wedge-shaped GIF; wedge-shaped graded-index fiber tip; Diode lasers; Erbium-doped fiber lasers; Laser excitation; Lenses; Optical coupling; Optical fiber applications; Optical fiber devices; Optical fibers; Pump lasers; Semiconductor lasers;
Journal_Title :
Lightwave Technology, Journal of
