Simulated gain control equipment and method for erbium-doped fiber amplifier
An erbium-doped fiber and analog gain technology, applied in the field of optical communication, can solve the problems of high device precision requirements and complex analog control circuit debugging, and achieve the effects of simple circuit implementation, simplified debugging work, and reduced signal distortion.
Inactive Publication Date: 2005-06-29
ALCATEL LUCENT SHANGHAI BELL CO LTD
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[0007] The object of the present invention is to provide a kind of analog gain control device and its device for erbium-doped fiber amplifier, it overcomes the shortcoming that analog control circuit debugging is complicated, requires high precision to the device, has the advantage of analog control circuit again simultaneously, for The use of analog circuits to control Erbium-doped fiber amplifiers provides a good way
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[0018] The invented analog gain control method of the erbium-doped fiber amplifier, its process is: the optical input and output end respectively perform optical input and output coupling, the output optical signal is then subjected to optical input, output optical power detection, and optical / electrical conversion. And the converted electrical signals are respectively amplified and compared to obtain an error control voltage, lock the automatic power, and output a control signal, which is driven by the laser to control the pump laser in the erbium-doped fiber amplifier. The control of the size of the pumping current can achieve the control of the gain of the erbium-doped fiber amplifier.
[0019] Such as image 3 Shown, the present invention, promptly the analog gain control device of erbium-doped fiber amplifier, comprises optical input, output end 31,32, optical input, output coupler 33,34, input, output optical power detection circuit 35,36, two amplifiers 37,38, a compar...
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A analog gain control arrangements for erbium-doped fiber amplifier and the process thereof, wherein the process comprises, performing optical input and output coupling on the optical input and output terminals, the output optical signal going through optical input and output optical power detecting, proceeding optical / electricity conversion, magnifying the transformed electrical signal, proceeding value comparison to obtain an error control voltage, locking the automatic power and exporting a control signal, controlling the pump laser in the erbium-doped fiber amplifier through the laser drive, controlling the pumping current value of the pump laser, thus realizing the control of the gain of the erbium-doped fiber amplifier. The advantages of the invention include fast locking speed ofthe automatic power locking circuit, and low signal distortion ratio.
Description
(1) Technical field [0001] The invention relates to optical communication technology, in particular to gain control of an erbium-doped fiber amplifier in optical communication. (2) Background technology [0002] Erbium-doped fiber amplifier is an important part of optical transmission system, and it is a component used for optical signal amplification in DWDM (Dense Wavelength Division Multiplexing) system. When the number of optical wavelength signals transmitted in the optical fiber decreases, the power of the remaining optical wavelengths increases, which causes the nonlinear effect of the optical fiber, affects the system optical power budget, and degrades the transmission performance of the DWDM system. In order to avoid this situation, we need to keep the optical gain of the erbium-doped fiber amplifier constant, so that when the number of optical wavelength signals decreases, it returns to a constant optical gain value within a short period of time. [0003] There ar...
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IPC IPC(8): G02F1/39H04B10/294
Inventor 罗焱
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD