Yahei Koyamada

Optical Nonlinearities in Coherent Optical Time Domain Reflectometry Enhanced with Optical Fiber Amplifiers

Hisashi Izumita, Shinichi Furukawa, Izumi Sankawa, 1994 .

Coherent optical time-domain reflectometer with a 40-dB dynamic range enhanced with erbium-doped fiber amplifiers

Hisashi Izumita, Shinichi Furukawa, Izumi Sankawa, 1992 .

1.65-nm Brillouin optical time domain reflectometry employing a Raman fiber amplifier and a lithium niobate phase-modulator

Hisashi Izumita, Mitsuhiro Tateda, Tsuneo Horiguchi, 1997, Proceedings of Optical Fiber Communication Conference (.

Theoretical analysis of optical fiber mode exciters constructed with alternate concatenation of step-index and graded-index fibers

Masamitsu Tokuda, Tsuneo Horiguchi, Yahei Koyamada, 1985 .

Fault-locating technique for in-service 1:98 branched optical networks using an amplified optical time-domain reflectometer

Hisashi Izumita, Izumi Sankawa, Shinichi Furukawa, 1991 .

Launching and receiving conditions for optical fiber loss measurements using an OTDR

Shinichi Furukawa, Yahei Koyamada, 1988 .

Enhancement of otdr performance with an optical fiber amplifier

Hisashi Izumita, Shinichi Furukawa, Izumi Sankawa, 1992 .