Patent ID: 8934168
Filing Date: 2015-01-13
Classification: H04B

Abstract:
1. A method for amplifying and dynamically adjusting an optical signal, comprising: in a passive optical network which comprises Optical Line Terminals (OLTs) and Optical Network Units (ONUs), the ONUs sending uplink optical signals which have different uplink optical powers in different uplink burst slots; a first optical tap, after receiving each uplink optical signal, splitting out a small part of the uplink optical signal and outputting the small part of the uplink optical signal to a first optical detector; the first optical detector converting the small part of the uplink optical signal into an electric signal and then outputting it to a high speed gain control circuit; the high speed gain control circuit dynamically adjusting and outputting control signals to an optical amplifier based on dynamically varied electric signals from the first optical detector, wherein the electric signals dynamically vary with the different uplink burst slots; the first optical tap outputting the remaining part of the uplink optical signal to the optical amplifier through a section of delay fiber to ensure the remaining part of the uplink optical signal and the control signal from the high speed gain control circuit reach the optical amplifier simultaneously, wherein, the optical amplifier is a Semiconductor Optical Amplifier (SOA), an operation mode of the SOA is an Automatic Power Control (APC) mode, and the APC operation mode can implement a high speed response to a burst signal; the optical amplifier dynamically adjusting gain values to the remaining part of uplink optical signals according to the control signals loaded from the high speed gain control circuit to make peak powers of output optical signals in different uplink burst slots equal, thereby achieving output power equalization; wherein a second optical tap and a second optical detector are not required for splitting out and converting the output optical signals output by the optical amplifier.