Optical fiber amplifier surge protective apparatus

Details Optical fiber amplifier surge protective apparatus Optical fiber amplifier surge protective apparatus

1999-01-13

2001-05-08

Moskowitz, Nelson (Department: 3662)

Optical: systems and elements

Optical amplifier

Optical fiber

C359S199200

Reexamination Certificate

active

06229643

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber amplifier surge protective apparatus for complementing a hit of an optical signal by monitoring the level of a branch optical signal branched from the optical signal.
In a wave length division multiplexing (WDM) optical transmission system using an optical fiber amplifier, when a hit occurs on an optical fiber line, and the line recovers from the continuous hit, an optical signal is abruptly input to the optical fiber amplifier in a no-signal state to generate an optical surge. Such optical surge is a phenomenon in which energy stored by pumping light during a no-signal state is induced and emitted at once by a newly input optical signal after the recovery of the optical fiber line. This optical surge damages optical components such as a light-receiving element.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an optical fiber amplifier surge protective apparatus for suppressing an optical surge upon occurrence of a hit on an optical fiber line.
To achieve the above object, according to the present invention, there is provided an optical fiber amplifier surge protective apparatus comprising optical branch means for branching an optical signal input from an optical fiber line into a main optical signal on a main optical path and a branch optical signal on a branch optical path, optical delay means for delaying the main optical signal on the main optical path, light input hit detecting means for monitoring a level of the branch optical signal on the branch optical path to detect an optical fiber line hit, compensation optical signal generating means for generating a compensation optical signal having a wavelength different from a wavelength of the optical signal input when the light input hit detecting means detects the optical fiber line hit, and optical multiplexing means for multiplexing the compensation optical signal from the compensation optical signal generating means and the delayed main optical signal from the optical delay means.


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