Optical fiber amplifier

Details Optical fiber amplifier Optical fiber amplifier

1996-04-30

1997-05-27

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359177, H01S 300

Patent

active

056337507

ABSTRACT:
The invention offers an optical fiber amplifier with good frequency characteristics which allows the gain to be held constant even without an input signal beam and allows gain control with respect to input optical signals with high-speed power fluctuations. An excitation beam source 8 supplies an excitation beam for light amplification and a control beam source 15 supplies a control beam for controlling the gain to an EDF 4 which amplifies a signal beam by means of optical excitation. An excitation beam monitor 9 measures the power of the excitation beam when inputted to the EDF 4 and an excitation beam monitor 12 measures the power of the excitation beam when outputted from the EDF 4. A comparator 11 calculates the ratio between the power measured by the excitation beam monitor 9 and the power measured by the excitation beam monitor 12. A drive circuit 14 controls the power of the control beam supplied by the control beam source 15 based on the results obtained by the comparator 11.

REFERENCES:
patent: 5374973 (1994-12-01), Maxham et al.
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5506724 (1996-04-01), Shimizu et al.

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