Impact of fiber effective core area on transmission performance of various data rates over 390 km repeaterless bidirectional Raman span

Kerr nonlinear signal distortion and optical signal to noise ratio degradation are two major limiting factors on repeaterless bidirectional Raman amplified ultra-long span system. Both of these limiting factors are affected by the size of the fiber effective core area. The impact of fiber effective core area to Raman amplification gain, Kerr nonlinear signal distortion, Raman amplifier induced noise and optical signal to noise ratio are analytically investigated. Performance characteristics of various transmission data rate of differential phase modulated signal over 390 Km transmission distance of different effective core area fibers are examined. Raman analytical model and transmission simulation model show the advantage of large effective area fiber on reducing both limiting factors and enhance transmission performance.