Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-06-13
1996-04-16
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359174, 359337, 372 66, 385124, H01S 330, G02B 626
Patent
active
055088422
ABSTRACT:
In an optical amplifier for amplifying a signal light by propagating the signal light and a pumping light in a rare earth element doped fiber doped with a rare earth element, a diameter of a rare earth element doped portion of the rare earth element doped fiber is gradually reduced in a direction of propagation of the pumping light. With this construction, an adverse rare earth element doped area which does not contribute to optical amplification, but rather attenuates the pumping light, can be eliminated to thereby provide an optical amplifier having increased amplification efficiency.
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O Plus E, No. 113, 1989, pp. 75-82.
B. J. Ainslie et al., "Fabrication and Optimisation of the Erbium Distribution in Silica Based Doped Fibres", Fourteenth European Conference On Optical Communication (ECOC '88), Part I, pp. 62-65, Sep. 11, 1988, London, GB.
Inagaki Sinya
Sasaki Kazuya
Tagawa Kenji
Takeda Keiko
Yoshizawa Sakae
Fujitsu Limited
Moskowitz Nelson
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