Yahei Koyamada

发表

High dynamic range coherent OTDR for fault location in optical amplifier systems

S. Furukawa, Kuniaki Tanaka, Yahei Koyamada, 1994, Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9).

Brillouin optical-fiber time domain reflectometry

Yahei Koyamada, Hisashi Izumita, Toshio Kurashima, 1993 .

Basic concepts of fiber optic subscriber loop operation systems

Yahei Koyamada, N. Ohta, N. Tomita, 1990, IEEE International Conference on Communications, Including Supercomm Technical Sessions.

Improvement of Analysis Precision for OTDR Traces with Fresnel Reflections using Neural Networks

Yoshitaka Enomoto, Yahei Koyamada, Nobuo Tomita, 1996 .

1.65-μm optical surveillance and test system for subscriber lines and ultralong-span trunk lines

Yahei Koyamada, Tsuneo Horiguchi, Shin ichi Furukawa, 1994 .

Use of signal processing techniques to improve the dynamic range of coherent OTDRs

Yahei Koyamada, Norihisa Ohta, Hiroshi Nakamoto, 1992 .

Optical Fiber Line Surveillance System for Preventive Maintenance Based on Fiber Strain and Loss Monitoring (Special Issue on Optical Fiber Cables and Related Technologies)

Yahei Koyamada, Tsuneo Horiguchi, Shinichi Furukawa, 1993 .

Fresnel Reflections Detection Method of OTDR Traces with Neural Networks

Yoshitaka Enomoto, Yahei Koyamada, Nobuo Tomita, 1994 .

Accurate Sensing of Optical Connector Loss using OTDR and Neural Networks

Yoshitaka Enomoto, Yahei Koyamada, Nobuo Tomita, 1996 .

Extended Finite Difference Time Domain Analysis of Induced Phase Modulation and Four-Wave Mixing between Two-Color Femtosecond Laser Pulses in a Silica Fiber with Different Initial Delays

Yahei Koyamada, Ryuji Morita, Hiroyasu Sone, 2005 .

In-service remote access and measurement methods for passive double star networks

Yahei Koyamada, Izumi Sankawa, Norio Takato, 1993, Proceedings of 5th Conference on Optical Hybrid Access Networks.

Non-Blocking 100 × 100 Optomechanical Matrix Switch

Yahei Koyamada, Toshiaki Katagiri, 1993 .

Analysis and design of Q-switched erbium-doped fiber lasers and their application to OTDR

Yahei Koyamada, Y. Koyamada, S. Adachi, 2002 .

Coherent optical frequency domain reflectometry using phase-decorrelated reflected and reference lightwaves

Yahei Koyamada, Kaoru Shimizu, Tsuneo Horiguchi, 1997 .

Stochastic amplitude fluctuation in coherent OTDR and a new technique for its reduction by stimulating synchronous optical frequency hopping

Yahei Koyamada, Hisashi Izumita, Izumi Sankawa, 1997 .

High Performance Coherent OTDR Enhanced with Erbium Doped Fiber Amplifiers

Yahei Koyamada, Norihisa Ohta, Hiroshi Nakamoto, 1992 .

Distributed strain measurement using BOTDR improved by taking account of temperature dependence of Brillouin scattering power

Yahei Koyamada, Hisashi Izumita, Toshio Kurashima, 1997 .

Characteristics and reduction of coherent fading noise in Rayleigh backscattering measurement for optical fibers and components

Yahei Koyamada, Kaoru Shimizu, Tsuneo Horiguchi, 1992 .

Optical Fiber Line Survellance System for Preventive Mainteneance Based on Fiber Strain and Loss Monitoring

Yahei Koyamada, Izumi Sankawa, Tsuneo Horiguchi, 1993 .

Finite-difference time-domain analysis of ultrashort laser pulse propagation in a fiber with nonlinear effects

Yahei Koyamada, Ryuji Morita, Hiroyasu Sone, 2003 .

Measurement of Distributed Strain in Frozen Cables and its Potential for Use in Predicting Cable Failure

Yahei Koyamada, Toshio Kurashima, Tsuneo Horiguchi, 1997 .

The performance limit of coherent OTDR enhanced with optical fiber amplifiers due to optical nonlinear phenomena

Yahei Koyamada, Hisashi Izumita, Izumi Sankawa, 1994 .

In-service Optical Fiber Line Monitoring by Wavelength Division Multiplexing Technique

Yahei Koyamada, Izumi Sankawa, Yutaka Wakui, 1993 .

Carrier-envelope-phase stabilized chirped-pulse amplification system scalable to higher pulse energies.

Yahei Koyamada, Shinki Nakamura, Hideyuki Takada, 2004, Optics express.

Normal‐mode analysis of anisotropic and gyrotropic thin‐film waveguides for integrated optics

Yahei Koyamada, Y. Koyamada, T. Makimoto, 1972 .

Large extension of dynamic range in distributed-fiber strain measurement using Brillouin spectroscopy

Yahei Koyamada, Toshio Kurashima, Mitsuhiro Tateda, 1991 .

A Tunable 1.6 μm Band Optical Time-domain Reflectometer

Yahei Koyamada, Tsuneo Horiguchi, Toshiya Sato, 1998 .

Spatial-resolution improvement in long-range coherent optical frequency domain reflectometry by frequency-sweep linearisation

Yahei Koyamada, Kaoru Shimizu, Tsuneo Horiguchi, 1997 .