Stabilized optical-frequency transfer using optical injection locking amplifier

摘要

A simple and novel optical injection locking amplifier (OILA) for optical frequency transfer applications is experimentally demonstrated. A commercial distributed feedback diode laser is injection locked to the resonance of optical frequency signal with the optical path length of hundreds of kilometers, providing more than 50dB gain and ensure that the input carrier frequency fractional stability can reach 10^-20at 1000s. The amplifier was tested for the transfer of commercial narrow linewidth laser carrier over bidirectional operated 200 km fiber link with only single gain step. The transferred frequency at the remote end can reach 4.7 × 10^-20at 20000s, which is suitable for the optical frequency distribution and remote comparison among optical atomic clocks.