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New kind of injection-locked oscillator and its corresponding long-term stability control

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Abstract

A new type of opto-electronic hybrid oscillator is proposed for the first time, to the best of our knowledge, and verified by experiments in this paper. Typical electronic oscillator-dielectric resonator oscillator as the first injection source is used to injection lock the first long-fiber loop-based opto-electronic oscillator (OEO); then its output is used to injection lock the second long-fiber opto-electronic oscillator. Using this method, low-phase noise output signal can be obtained. Experiments show that single side-band (SSB) phase noise of a 9.5 GHz oscillation signal at 10 kHz offset frequency decreases from 123 to 135dBc/Hz after the first injection, then, through the second injection, the SSB phase noise drops down to 146dBc/Hz. In order to solve the long-term stability problem of the above oscillator, a new stability-control circuit also is designed and verified by experiments. Experiments show that the Allan deviation decreases from 9.0×1011 to 2.2×1012 during 1 s after the long-term stability-control circuit being used.

© 2015 Optical Society of America

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