3.2 Terabit/s (320 × 10.66 Gbit/s) C+L unrepeatered transmission over 310 km using a low noise distributed Raman amplification

Error-free unrepeated C+L transmission of 320 25 GHz spaced channels at 10.66 Gbit/s over 310 km is demonstrated. A low noise distributed Raman amplification over 72.4 nm optical bandwidth is implemented

Introduction

Recent records show that unrepeatered systems with long distance (>250 km) and capacity larger than 1 Tbit/s are now achievable using core area fibre mixing or/and 2^nd order pumping distributed Raman amplification to improve system performances [1] [2], [3]. In this paper, 320 channels at 10.66 Gbit/s are transmitted error-free over 310 km of Pure Silica Core Fibre (PSCF) over bands using 2^nd order pumping distributed Raman amplification with time division multiplexed pumps and core area fibre mixing. Combined with 25 GHz spacing, this enable us to demonstrate to our knowledge, the highest capacity over bands for an unrepeatered distance larger than 250 km.