We experimentally evaluate the influence of RIN transfer from pump to signal on the transmission performance of a 10 × 30 Gbaud DP-QPSK transmission system using a 2nd-order ultra-long Raman fiber laser amplifier, considering the effect of cavity front-end reflectivity and forward pump power ratio. The evolution of the Q-factors with distance up to maximum reach is monitored for a 10 × 30 Gbaud DP-QPSK transmission system with WDM channels between 1542.94 nm to 1550.12 nm. A maximum transmission distance of 6479 km is found for configurations with low forward pump powers corresponding to the optimal balance between RIN and ASE impairments.
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Funding: People Programme of the European Union’s Seventh Framework Programme FP7 under grant 608099; Spanish MINECO grant TEC2015-71127-C2; Comunidad de Madrid grant S2013/MIT-2790-SINFOTON-CM and UK EPSRC programme grant UNLOC EP/J017582/1.
- Fiber optics communications
- ) Fiber optics amplifiers and oscillators
- coherent communications
Performance optimization in ultra-long Raman laser amplified 10x30 GBaud DP-QPSK transmission: Balancing RIN and ASE noise