Chen, Wen TzungWen TzungChenLON A. WANG2009-03-252018-07-062009-03-252018-07-0620001559128Xhttp://ntur.lib.ntu.edu.tw//handle/246246/148163https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000970798&doi=10.1364%2fAO.39.004490&partnerID=40&md5=bd145cd68e6f49cfcc4b76d67f3828deA novel optical coupling scheme that uses a lensed fiber integrated with a long-period fiber grating (LPFG) is proposed. Two experiments are performed to demonstrate the validity of such a scheme in single-mode-fiber-single-mode-fiber (SMF-to-SMF) and laser-diode-single-mode-fiber (LD-to-SMF) coupling setups. The measured results show that for an appropriate lens radius the addition of a LPFG will lead to a higher coupling efficiency over a longer range of working distance than without the LPFG. Coupling efficiencies of ∼78% and 35% are achieved for corresponding working distances of ∼250 and 110 mm, 1-dB longitudinal tolerances of ∼40 and 26 μm, and 1-dB transverse tolerances of ∼7.6 and 2.6 mm for SMF-to-SMF and LD-to-SMF, respectively. © 2000 Optical Society of America.application/pdf240640 bytesapplication/pdfen-USOptical instrument lenses; Semiconductor lasers; Single mode fibers; Optical couplings; Fiber Bragg gratingsjournal article10.1364/AO.39.0044902-s2.0-0000970798http://ntur.lib.ntu.edu.tw/bitstream/246246/148163/1/27.pdf