Optical transmission apparatus and control method therefor
US7463829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2004 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Jun 23, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; a gain-controlled type optical amplifier for amplifying the wavelength-division multiplexed signal lights; an optical attenuator coupled to the amplifier; and a control unit for controlling the optical amplifier and the optical attenuator so as to keep the output level of the wavelength-division multiplexed signal lights to a predetermined target value, wherein the control unit restrains automatic output level control by the optical attenuator when the supervisory signal light power fluctuates within its permissible range and fluctuations in the signal light power have deviated from its permissible range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.