Limitations of the frequency stability transfer in the near infrared using a fiber-based ring cavity
Résumé
We describe a fiber ring cavity for transferring frequency stability from a metrological optical reference at 1542 nm to tunable lasers covering a hundred nm around 1.55µm and show a stability transfer to the 10-15 level in relative value. The optical length of the ring is controlled by two actuators: a cylindric piezoelectric actuator (PZT) on which a portion of the fiber is coiled and glued for fast corrections (vibrations) acting on the length of the fiber and a Peltier module for slow corrections acting on its temperature. We characterize the stability transfer and analyze the limitations imposed by two critical effects in the setup: Brillouin backscattering and the polarization modulation generated by the electro-optic modulators used in the error signal detection scheme. We show that it is possible to reduce the impact of these limitations to a level below the detection threshold imposed by the servo noise. We also show that in the long term, the limitation to the stability transfer is a thermal sensitivity of-550 Hz/K/nm which could be reduced by active control of the ambient temperature.
Domaines
Optique [physics.optics]
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