Fig. 3: Bit-error rate (BER) results of 38 channels in both directions for PSA pre-amplified and EDFA pre-amplified same-wavelength bidirectional transmission.
From: High-capacity phase-sensitively amplified transmission in a field-deployed fiber cable
a Direction 1. b Direction 2. The blue circles are the PSA pre-amplified results, while the red squares indicate EDFA pre-amplified results. The black dotted line is the BER threshold of 2.4 × 10−2, which is the 20% pre-FEC limited.
