Optical pre-amplifier apparatus and method for receiver performing gain control according to LOS declaration
US6522461B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2000 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Mar 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1001
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver node includes an optical amplifier optically coupled to the input of a receiving device such as a PIN photodiode. A controller inputs received power level values from the receiver to perform gain control. The input signal of an optical receiving device is pre-amplified by an optical amplifier such that the amplified signal is within a dynamic range of the receiving device. Upon the occurrence of a LOS (loss of signal) event, the controller sets the gain to a Home Gain value. Thus, when the signal is reestablished, a strong signal will not be over amplified and damage the receiver. Gain control is reestablished when the LOS event is over. Various methods are used to declare LOS including comparing the received power level or commanded pump power against a threshold. The LOS declaration may also be received from an external device or service channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.