Fig. 1. Typical structure of the remote transmission and amplification OFH system using dedicated pump path

Fig. 2. Variation of phase noises of hybrid remote amplification with the RGU position

Fig. 3. Comparison of simulated phase noises caused by the 100-km amplification system with different transmission links

Fig. 4. Improvement of G .654 fiber for pump transmission loss

Fig. 5. Improvement of G .654 fiber for pump-induced Raman scattering

Fig. 6. Improvement of the G.654/ULL-G.652 link for phase noises in the 100-km transmission system

Fig. 7. Measured results of phase noise in the short-haul system

Fig. 8. Variation of phase noise with the RGU position in a 150-km transmission system using G.654/ULL-G.652 fiber

Fig. 9. Measured results of phase noise in the 150-km transmission system using G.654/ULL-G.652 fiber