Wavelength division multiplexing device, an optical leakage prevention method, and a wavelength division multiplexing communication system
US7619813B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2005 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Jun 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/258
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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”.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.