Optical amplifier gain noise compensation method and apparatus
A noise compensation, optical amplifier technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., to achieve the effect of convenient engineering application and great application value
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[0050] first embodiment
[0051] 3a is a view of a noise compensation circuit implemented based on an operational amplifier according to the first embodiment of the present invention.
[0052] Referring to Figure 3a, in this embodiment, the gain control is implemented by a hardware analog closed-loop circuit, and the noise power compensation circuit is implemented by an operational amplifier.
[0053] As shown in Figure 3a, since the ASE power is a fixed value for a fixed gain, that is to say, the PASE is a fixed power, and the incident light detection of the EDFA is linear detection, so it is only necessary to add the incident light detection branch end A fixed voltage value, as the equivalent incident light detection voltage, can realize the compensation function of ASE noise. Therefore, the corrected incoming light and the corresponding light outgoing signal are the final equivalent control parameters, and gain locking control is performed.
Example
[0054] Second Embodiment
[0055] 3b is a view of a noise compensation circuit implemented based on an operational amplifier according to a second embodiment of the present invention.
[0056] Referring to Figure 3b, the gain control is also implemented by a hardware analog closed-loop circuit, and the noise power compensation circuit is implemented by an operational amplifier, ie, by a subtractor. The main method is to divide the voltage (shunt) at the EDFA output. Different from FIG. 3a, in this embodiment, a fixed voltage value is added to the end of the light-emitting detection branch, so as to realize the compensation function of ASE noise.
[0057] 4a is a view of a noise compensation circuit based on a field programmable gate array (FPGA) implementation according to a third embodiment of the present invention, and FIG. 4b is a field programmable gate array (FPGA) based implementation according to a fourth embodiment of the present invention. The view of the noise co...
Example
[0059] Third Embodiment
[0060] As shown in Fig. 4a, the FPGA realizes the collection of the incident light analog electrical signal through the AD acquisition module 402, and the incident light correction amount setting module 406 and the adder module 404 correct the incident light detection and detection digital signal, so as to realize the ASE noise reduction. compensation function. The gain locking control is performed with the corrected incoming light and the corresponding light outgoing signal as the final equivalent control parameters.
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