Optical amplifier and gain adjustment method for optical amplifier
AssigneeHuawei Technologies Co., Ltd.
InventorHengyun Jiang
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Abstract
This application discloses an optical amplifier including a Raman fiber amplifier (RFA), a dynamic gain equalizer (DGE), a filter, an erbium-doped fiber amplifier (EDFA), an RFA gain controller, an EDFA gain controller, and an optical amplifier controller. The optical amplifier controller is configured to provide instructions to and receive feedback from the RFA and EDFA gain controllers. The RFA and the EDFA are configured to amplify an optical signal. The RFA gain controller is configured to control the RFA to adjust a gain. The EDFA gain controller is configured to control the EDFA to adjust a gain. The DGE adjusts insertion loss. The filter is configured to filter an amplified spontaneous emission signal produced in an optical amplification process of the RFA.
Claims13
An optical amplifier, comprising a Raman fiber amplifier (RFA), a dynamic gain equalizer (DGE), a filter, a first erbium-doped fiber amplifier (EDFA), an RFA gain controller, a first EDFA gain controller, and an optical amplifier controller, wherein
- the RFA gain controller is connected to the RFA, the RFA gain controller is further connected to the filter, and the filter is connected to an output terminal of the RFA;
- the first EDFA gain controller is connected to the first EDFA;
- the optical amplifier controller is connected to the RFA gain controller, and the optical amplifier controller is further connected to the first EDFA gain controller;
- and the RFA is connected to the DGE, and the DGE is further connected to the first EDFA;
- the optical amplifier controller is configured to send a first instruction to the RFA gain controller, send a second instruction to the first EDFA gain controller, and send a DGE control instruction to the DGE;
- the RFA and the first EDFA are configured to amplify an optical signal, and the RFA gain controller is configured to control the RFA to adjust a gain according to the first instruction;
- the first EDFA gain controller is configured to control the first EDFA to adjust a gain according to the second instruction;
- and the DGE adjusts an insertion loss according to the DGE control instruction;
- and
- the filter is configured to filter an amplified spontaneous emission (ASE) signal produced in an optical amplification process of the RFA;
- wherein the optical amplifier controller determines an on-off gain of the RFA based on the ASE signal, wherein the on-off gain is a ratio of an output signal power with a pump of the RFA turned on to an output signal power with the pump turned off.
A memory configured to store a computer-executable instruction that, when executed by a processor, causes the processor to perform:
- sending a first or a second control instruction to adjust a pump current of a RFA or a EDFA respectively;
- receiving a first feedback message and a second feedback message, wherein the first feedback message comprises an actual gain value of the RFA, and the second feedback message comprises an actual gain value of the EDFA;
- determining an actual insertion loss value of a DGE based on the actual gain value of the RFA and the actual gain value of the EDFA;
- and
- sending a DGE control instruction to control the insertion loss of the DGE, so that insertion loss of the DGE reaches the determined actual insertion loss value of the DGE;
- wherein the determining an actual insertion loss value of a DGE based on the actual gain value of the RFA and the actual gain value of the EDFA comprises:
- determining that the sum of the actual gain value of the RFA and the actual gain value of the EDFA is greater than the target gain value of the optical amplifier;
- subtracting the target gain value of the optical amplifier from the sum of the actual gain value of the RFA and the actual gain value of the EDFA to obtain the actual insertion loss value of the DGE.
Dependencies are inferred from the claim text.