A SCHEME FOR GAIN FLATTEN OF FIBRE RAMAN AMPLIFIER FOR WDM TRANSMISSION SYSTEMS
The most attractive feature of Fiber Raman amplifiers are extremely large gain bandwidth and play an important role
in wavelength division multiplexing (WDM) systems. However, the weakness of Raman amplifier is that the gain
spectrum is flat for very small narrowband. So, it is necessary to flatten the Raman gain profile to achieve the desire
performance for the WDM systems. This paper has proposed an extrinsic gain flattening technique for WDM
transmission systems using Polarization-diversity Loop Filter (PDLF). With this technique, an equalize bandwidth of
114nm (1536nm – 1650nm) can be achieved with a gain ripple of 0.5dB.
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