Abstract

We demonstrate a double optical frequency reference (1529 and 1560 nm) for the telecom C-band using Rb87 modulation transfer spectroscopy. The two reference frequencies are defined by the 5S1/2F=25P3/2F=3 two-level and 5S1/2F=25P3/2F=34D5/2F=4 ladder transitions. We examine the sensitivity of the frequency stabilization to probe power and magnetic field fluctuations, calculate its frequency shift due to residual amplitude modulation, and estimate its shift due to gas collisions. The short-term Allan deviation was estimated from the error signal slope for the two transitions. Our scheme provides a simple and high performing system for references at these important wavelengths. We estimate that an absolute accuracy of 1kHz is realistic.

© 2015 Optical Society of America

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