Wavelength division multiplexing device, an optical leakage...

Details Wavelength division multiplexing device, an optical leakage... Wavelength division multiplexing device, an optical leakage...

2005-06-20

2009-11-17

Bolda, Eric (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

C398S038000, C398S094000

Reexamination Certificate

active

07619813

ABSTRACT:
A wavelength division multiplexing (WDM) device, an optical leakage prevention method, and a WDM communication system are disclosed. The WDM device includes a level adjusting unit for receiving an optical signal, for adjusting the optical power level of the received optical signal, and for outputting the level-adjusted optical signal; and a controlling unit for analyzing the optical power level of the optical signal output from the level adjusting unit, for controlling the level adjusting unit so that the optical power level of the output optical signal stays at a constant level, and for transitioning to an “off-state” when the optical power level of the output optical signal becomes less than a predetermined disconnection-detection threshold so that the level adjusting unit gives a predetermined attenuation to the input optical signal. The controlling unit transitions from the “off-state” when the optical power level of the output optical signal is greater than a predetermined recovery threshold and an upstream WDM device is not in the “off-state”.

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