Abstract
Relative intensity noise (RIN) induced penalties were experimentally measured in distributed Raman amplifiers (DRAs) for G.654.E and G.652.D fibres with forward, backward and bidirectional pumping configurations. The measured signal RIN using the G.654.E fibre was ∼3.5 dB and ∼2 dB lower than the G.652.D fibre with forward (FW) pump configuration for PM-QPSK and PM-8QAM signals, with single span transmission showing a Q-factor improvement of ∼3 dB and ∼2.5 dB for G.654.E over G.652.D fibres. The performance penalty in a long haul coherent system was evaluated for 28 GBaud PM-QPSK signals using a recirculation loop for backward and bidirectional distributed Raman amplifiers. Our experimental results demonstrate an additional transmission distance of more than 1000 km for G.654.E over its counterpart G.652.D assuming a HD-FEC limit of 8.5 dB.
Highlights
The strong demand for optical fibre communication systems with high data rate over longer reach and with advanced modulation format is highly evident [1]
In this work we experimentally investigated the impact of pump induced signal Relative intensity noise (RIN) penalty for a distributed Raman amplifiers (DRAs) in forward (FW), backward (BW), and bidirectional (BI) schemes with G.654.E-compliant Corning TXF and G.652.D standard single mode fibre (SMF) fibres
Results and discussions for long haul transmission with BW and BI pumping From Fig. 4 we can clearly see an improved performance of G.654.E over G.652.D fibre for both BW and BI pumped DRAs with 10 span and 20 span transmission
Summary
The strong demand for optical fibre communication systems with high data rate over longer reach and with advanced modulation format is highly evident [1]. Fibres with large effective area (Aeff) provide a smart solution in terms of large spectral efficiency enabling higher channel capacity and longer reach [2] To address this problem, ITU-T approved G.654.E as a new fibre for terrestrial network [3]. Transmission experiments have been performed and the results have shown an extended reach >55% in comparison to standard G.652.D single mode fibre (SMF) for 200Gb/s PM-16QAM signals [5]. In this work we experimentally investigated the impact of pump induced signal RIN penalty for a DRA in forward (FW), backward (BW), and bidirectional (BI) schemes with G.654.E-compliant Corning TXF and G.652.D standard SMF fibres. The performance penalty for long haul coherent systems was validated with a recirculating loop amplified using a BW and BI configured DRA for a 28-GBaud PM-QPSK signal. The Q penalty i.e. Q-factor difference between BI and BW pumping at fixed distance shows better performance for G.654.E in comparison to G.652.D, with a maximum Q factor penalty reaching up to ∼3 dB for G.654.E and ∼4.1 dB for G.652.D fibres
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