T. Matsumoto

Polarization insensitive optical amplifier consisting of two semiconductor laser amplifiers and a polarization insensitive isolator in series

M. Koga, M. Koga, T. Matsumoto, 1989, IEEE Photonics Technology Letters.

Prevalence and clinical characteristics of TT virus (TTV) in patients with sporadic acute hepatitis of unknown etiology.

H. Yatsuhashi, M. Koga, A. Igarashi, 1999, Journal of hepatology.

Immunohistochemical analysis of hepatic interferon alpha-beta receptor level: relationship between receptor expression and response to interferon therapy in patients with chronic hepatitis C.

H. Yatsuhashi, M. Koga, T. Fujino, 1999, Journal of hepatology.

Proposal for neural-network applications to fiber-optic transmission

T. Matsumoto, M. Koga, K. Noguchi, 1990, 1990 IJCNN International Joint Conference on Neural Networks.

Novel learning method for analogue neural networks

T. Matsumoto, M. Koga, M. Koga, 1990 .

Polarisation-insensitive high-isolation nonreciprocal device for optical circulator application

M. Koga, T. Matsumoto, 1991 .

High-gain polarization-insensitive optical amplifier

M. Koga, M. Koga, T. Matsumoto, 1991 .

A novel optical WDM demultiplexer consisting of a simple optical multimode guide and an electrical neural network

M. Koga, M. Koga, T. Matsumoto, 1990, IEEE Photonics Technology Letters.