Method and apparatus for Raman amplifying of dual wavelength structure with linear gain

Abstract

According to the method and apparatus for Raman amplifying of dual wavelength structure with linear gain, two pumping lights are executed a WDB wave combination and then interact with signal lights in optical fibers to generate Raman amplifying, wherein the two pumping lights are executed a pre-allocation to satisfy the following connections: A, wavelengths if the two pumping lights are set to ensure that the magnification wavelength band-width respectively fall along the linear gain zones before and after the Raman gain spectrum; B, the power ratio of the two pumping lights is set as a numerical value of N to leveling the gain spectrum in the gain bandwidth. Thus, the linear relationship of the Raman amplifying gain and the pumping source power is realized, the gain plainness degree is also ensured, the change of the Raman gain basically doesn't affect the changes of the gain plainness degree, the control of the Raman amplifier is greatly simplified and becomes more reliable; at the same time, since the field measurement of the initializtion parameters requested by controls are not necessary, the applications cost and the applications complication degree of the Raman amplifier are dramatically reduced.

Description

technical field [0001] The invention relates to a Raman amplifier (Raman Amplifier) ​​in the field of optical transmission, in particular to a method for making a dual-wavelength structure Raman amplifier have a linear gain and a dual-wavelength structure Raman amplifier with a linear gain. Background technique [0002] In the optical transmission system, the optical amplification technology represented by erbium-doped fiber amplifier (EDFA) has replaced the traditional optical-electrical-optical relay mode; combined with wavelength division multiplexing (WDM) technology, the EDFA amplifier realizes a fiber The simultaneous amplification of multiple optical signals in the optical fiber not only reduces the cost of the relay, but also successfully increases the information capacity and transmission distance that can be transmitted in the optical fiber. [0003] However, there are still many deficiencies in EDFA amplifiers: firstly, EDFA has limitations in working band and ban...

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