OPTICAL PRE-AMPLIFIER APPARATUS AND METHOD FOR RECEIVER PERFORMING GAIN CONTROL ACCORDING TO LOS DECLARATION
First Claim
1. An apparatus for optically preamplifying a signal being input to a receiving device, comprising:
- an optical amplifier optically coupled to an input port of the receiving device, said optical amplifier optically amplifying an input signal and outputting the optically amplified signal to the receiving device;
a pump optically coupled to said optical amplifier, said pump injecting pumping light into said optical amplifier to provide the optical amplification of the input signal; and
a controller operatively connected to said pump and to the receiving device, said controller receiving power measurements from the receiving device indicative of the amplified signal'"'"'s optical power;
said controller commanding a pump power level output by said pump to perform gain control according to the power measurements received from the receiving device; and
said controller setting the commanded pump power level of said pump to a home gain value upon an occurrence of a loss of signal event.
6 Assignments
0 Petitions
Accused Products
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.
-
Citations
27 Claims
-
1. An apparatus for optically preamplifying a signal being input to a receiving device, comprising:
-
an optical amplifier optically coupled to an input port of the receiving device, said optical amplifier optically amplifying an input signal and outputting the optically amplified signal to the receiving device;
a pump optically coupled to said optical amplifier, said pump injecting pumping light into said optical amplifier to provide the optical amplification of the input signal; and
a controller operatively connected to said pump and to the receiving device, said controller receiving power measurements from the receiving device indicative of the amplified signal'"'"'s optical power;
said controller commanding a pump power level output by said pump to perform gain control according to the power measurements received from the receiving device; and
said controller setting the commanded pump power level of said pump to a home gain value upon an occurrence of a loss of signal event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of optically preamplifying a signal being input to a receiving device with an optical amplifier optically communicating with an input of the receiving device, comprising:
-
receiving power measurements indicative of the amplified signal'"'"'s optical power;
commanding a pump power level of a pump optically coupled to the optical amplifier, the pump injecting pumping light into the optical amplifier to provide the optical amplification of the input signal;
controlling said commanding step to perform gain control according to the power measurements received by said receiving step; and
setting the commanded pump power level of the pump to a home gain value upon an occurrence of a loss of signal event. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification