Ultralow-noise-index high-gain bidirectional Raman/erbium-doped hybrid optical fiber amplifier for optical fiber time-frequency synchronization

The invention discloses an ultra-low noise index and high gain bidirectional Raman/erbium-doped hybrid optical fiber amplifier for optical fiber time-frequency synchronization, which is characterized by comprising a bidirectional signal separation part and a signal dispersion compensation and amplification part. The bidirectional signal separation part is used for splitting and combining forward light and reverse light of signals of different channels in an optical fiber link and filtering out-of-band noise; the bidirectional signal separation part is used for splitting and combining forward light and reverse light and filtering out-of-band noise by using a plurality of WDMs (Wavelength Division Multiplexing); the signal dispersion compensation and amplification part compensates attenuation and dispersion of an optical fiber link; and the dispersion compensation part performs dispersion compensation by using a dispersion compensation optical fiber, obtains an ultra-low noise index by using a Raman optical fib