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Conference on Lasers and Electro-Optics

Survey of atomic transitions for absolute frequency locking of lasers for lightwave communication systems

Yun Chur Chung, AJ Lucero, RW Tkach

Published Jan 1, 1990• 0 citations
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Standardization of channel frequency allocation and calibration of the frequency scale at 1.55 /spl mu/m will require some frequency standards in this range. A promising avenue consists of making use of the two-photon transitions of rubidium at 778 nm to frequency-lock a 1556 nm laser. These lines have been recently measured by direct comparison to the Cs frequency standard with an uncertainty of 2 kHz. The method which we develop consists in using the second harmonic of the 1556 nm laser to injection-lock a low-cost laser diode operating at 778 nm which is then used to observe the transitions in rubidium.

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In recent years, much work has been done on the frequency stabilization of laser diodes through the electrical feedback loop, using for a frequency discriminator an optical resonator such as a fiber loop, a Fabry-Perot, or an atomic or molecular phenomenon. While allowing a reduction of frequency fluctuations, the lattar approach also gives the possibility of fixing precisely the absolute value of the laser frequency (wavelength) according to the quantum mechanics that govern the optical transition. Thus, if many resonances are observable in a close optical frequency domain, many sources can be set to precise distinguishable frequencies and become part of a muitiwavelength coherent communication system where the channel selectivity is done at the intermediate frequency level.1
Abstract We propose a scheme to phase lock a quantum-memory control laser, frequency-conversion pump laser, and two-photon source over three octaves in frequency to operate a quantum memory. The absolute frequencies of the laser sources are determined based on a Doppler-free iodine hyperfine transition. The achieved relative frequency instability and uncertainty were ≤1 × 10–12 and 3 × 10–11, respectively, which are below the requirement for operating a Pr:YSO quantum memory. This scheme simplifies the instrumentation of laser sources in a quantum repeater, and increases the reliability of quantum communication systems.
Standardization of channel frequency allocation and calibration of the frequency scale at 1.55 /spl mu/m will require some frequency standards in this range. A promising avenue consists of making use of the two-photon transitions of rubidium at 778 nm to frequency-lock a 1556 nm laser. These lines have been recently measured by direct comparison to the Cs frequency standard with an uncertainty of 2 kHz. The method which we develop consists in using the second harmonic of the 1556 nm laser to injection-lock a low-cost laser diode operating at 778 nm which is then used to observe the transitions in rubidium.