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We report a laser noise reduction method by locking it to an activelystabilized fiber-based Mach Zehnder interferometer with 10 km optical fiber toachieve large arm imbalance. An acousto optic modulator is used forinterferometer stabilization and heterodyne detection. The out-of-loopfrequency noise is reduced by more than 90 dB for Fourier frequency at 1 Hz.This structure presents an efficient laser noise reduction method both at highFourier frequency and low Fourier frequency. The signal of stabilized laser istransferred via a 10 km fiber link with a fractional frequency stability of1.12 times 10-16 at 1 s. Compared with the fractional frequency stability ofthat when the interferometer is not stabilized, more than one order ofmagnitude is improved.

Efficient laser noise reduction by locking to an actively stabilized fiber interferometer with 10 km arm imbalance