TY  - SER
AU  - ono, Hirotaka
AU  - Osa, 
AU  - Yamada, Makoto
TI  - S-Band Erbium-Doped Fiber Amplifiers with A Multistage Configuration /Sub E/Sign, Characterization, and Gain Tilt Compensation
KW  - Erbium
KW  - Optical Fiber Amplifier
KW  - Optical Fiber Communication
ER  -