A precise frequency transfer system using optical fiber has been developed. The purpose of the system is to distribute frequency standard with little deterioration to many distant users. It is composed of a phase compensation transmitter, bidirectional optical amplifiers, an optical distributor, and optical receivers. The system target is to achieve a stable transmission of hydrogen maser class signals. For short term stability, it shows the required optical received power to realize the Allan deviation of 1×10^-13 (averaging time of 1 s). For long term stability, a new compensation method using dense wavelength division multiplexing signals is effective to suppress phase fluctuation induced by fiber temperature change. Experimental results show stability of 8×10^-17 at 10⁵ s in a fiber link of 160 km in total with one bidirectional optical amplifier. This system is expected to be useful in a wide variety of areas such as calibration, measurement, particle physics, and radio astronomy.