Optical fiber amplifier for superimposing a sub-signal

Details Optical fiber amplifier for superimposing a sub-signal Optical fiber amplifier for superimposing a sub-signal

1996-06-27

1998-09-01

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359134, 359160, 359337, H04B 1017, H04S 317

Patent

active

058018778

ABSTRACT:
An optical fiber amplifier including, in addition to an amplification medium for amplifying signal light, an excitation light source which generates excitation light to be input into the amplification medium and a photocoupler for coupling the excitation light to the amplification medium, a modulator for amplitude the excitation light, a sub-signal generator for generating a sub-signal which is superimposed on the excitation light for amplitude modulation and a frequency filter for converting the frequency characteristic of the sub-signal to input it to the the modulator means, for superimposing the sub-signal due to change in gain of the amplification medium for intensity modulation of the excitation light. High-frequency components of the sub-signal are previously emphasized through the frequency filter, and the excitation light is amplitude-modulated by the sub-signal with the emphasized high-frequency components, to superimpose the satisfactory, waveform distortion-free sub-signal on the signal light.

REFERENCES:
patent: 4955081 (1990-09-01), Takahashi
patent: 5226051 (1993-07-01), Chan et al.
patent: 5383046 (1995-01-01), Tomofugi et al.
patent: 5394265 (1995-02-01), Nagel et al.
patent: 5475529 (1995-12-01), Takatu et al.
patent: 5515192 (1996-05-01), Watanabe

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