Raman fiber amplifier and automatic gain control method thereof

An automatic gain control, Raman fiber technology, applied in the field of optical communication, can solve the problem of not considering input power, etc., and achieve the effect of flexible use and wide application range

Active Publication Date: 2014-12-24
WUXI TACLINK OPTOELECTRONICS TECH CO LTD
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  • Abstract
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Problems solved by technology

However, this patent only considers the mathematical relationship between Raman gain and ASE, and does not consider the influence of input power. Therefore, this patent is only suitable for RFAs whose input optical power remains constant or has a small variation range.
[0009] In the patents CN141261A and CN202513934U, the extraction method of signal in-band and out-of-band ASE is mainly introduced. As for how to perform AGC control of RFA, there is no mention

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  • Raman fiber amplifier and automatic gain control method thereof
  • Raman fiber amplifier and automatic gain control method thereof
  • Raman fiber amplifier and automatic gain control method thereof

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0048] Under different Raman gains, there is a mathematical relationship between the signal output power and the ASE generated by the Raman amplifier itself, and the mathematical relationship is related to the gain and the magnitude of the input light. When the RFA gain is G, the relationship between the ASE power and output power generated by it is shown in formula (1):

[0049] Pase T (mw) = f(Pout) (1)

[0050] Through experiments and simulations, the relationship can be simplified to a first-order linear relationship:

[0051] Pase T (mw)=K G *Pout+C G (2)

[0052] The unit of power in the above formula is mw. When the power unit is dBm, formula (2) can be converted into:

[0053] Pase T =10*log(K G *10 (Pout / 10) +C G ) (3)

[0054] In formula (3), Pase T , Pout are the theoretical value of ASE power and Raman output power generated by R...

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Abstract

The invention an automatic gain control method of a Raman fiber amplifier. The automatic gain control method includes extracting in-band or out-of-band ASE (amplified spontaneous emission) power; adjusting power of a pumping laser to enable output power of the Raman fiber amplifier (RFA) and ASE power generated by the RFA to tend to meeting a formula (3): PaseT=10*log(KG*10(Pout / 10)+CG), wherein PaseT, Pout refer to theoretical value of the ASE power generated by the RFA and the Raman output power respectively, and unit is dBm; G refers to Raman gain, and unit is dB; KG and CG refer to slope and intercept value under the gain. The automatic gain control method is wide in application range, can be used for gain control of Raman amplifiers small in input light power change and can be applied to gain control of Raman amplifiers quite wide in input light power change range.

Description

technical field [0001] The invention belongs to the field of optical communication, and relates to a Raman Fiber Amplifier (RFA: Raman Fiber Amplifier) ​​automatic gain control (AGC: Automatic Gain Control) method. Background technique [0002] With the continuous improvement of transmission capacity, transmission distance and transmission speed of optical fiber communication system, Dense Wavelength Division Multiplexing (DWDM: Dense Wavelength Division Multiplexing) system based on Erbium-doped Optical Fiber Amplifier (EDFA: Erbium-doped Optical Fiber Amplifier) ​​has been Unable to meet the requirements of 100G and higher transmission rate systems, RFA is widely used in communication systems due to its low noise index, which can optimize OSNR (Optical Signal Noise Ratio), reduce bit error rate, and increase transmission distance. [0003] The gain medium of the RFA is the transmission fiber itself, so the RFA cannot simultaneously detect the input power when the pump is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/102H01S3/067
Inventor 王雷
Owner WUXI TACLINK OPTOELECTRONICS TECH CO LTD
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