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Optical pumping cesium clocks

Unprecedented accuracy and stability for assured PNT

Our modern, digitally driven world is increasingly reliant on highly accurate timing information traceable to Coordinated Universal Time (UTC). Regulatory environments are also becoming more stringent, contributing to a need for more capable ground-based timing and synchronization solutions. Adtran Oscilloquartz optical cesium atomic clocks leverage a technique called optical pumping to set new precision and performance benchmarks. These solutions support network operators, metrology institutes, scientific institutions and national timekeeping authorities, helping safeguard critical infrastructure and enable high-precision research with next-level accuracy and resilience. Designed for long-term performance and stability, the Oscilloquartz optical cesium portfolio delivers dependable timing for the most demanding synchronization environments.


Precision timing with industry's longest holdover

Oscilloquartz optical pumping cesium clocks put atoms into the correct state far more efficiently than legacy magnetic cesium solutions. The resulting improved accuracy and up to ten times greater clock stability exceeds the current ITU-T G.811.1 enhanced primary reference clock (ePRC) specification. What’s more, when combined with our core grandmaster devices to create an enhanced primary reference time clock (ePRTC), our most capable optical cesium solutions provide 100 nanoseconds of holdover for up to 100 days.



Robust defense against GNSS jamming and spoofing

With twice the lifespan of legacy magnetic cesium solutions and the ability to measure 100 times more atoms, Adtran’s highly efficient optical pumping cesium clock is fast becoming an indispensable element of timing and synchronization networks worldwide. Our all-digital, fully RoHS-compliant devices provide unrivaled precision for any mission-critical application and remain functional over extended periods, lowering the cost of network synchronization and rendering timing networks more sustainable and secure.



Enhanced short-term stability for mission-critical timing

Building on the long-term stability of our optical cesium atomic clocks, our Enhanced Short-Term Unit (ESTU) precision timing module sets a new standard for short-term frequency stability. Available as an enhancement to our OSA 3300 HP and SHP, the ESTU module significantly reduces Allan Deviation to deliver unprecedented accuracy for industries such as aerospace, metrology and defense. Supporting both 5MHz and 10MHz outputs, it provides synchronization levels comparable to a passive hydrogen maser – now unavailable in the Western market – ensuring ultra-precise timing for high-stakes applications like satellite communications and deep-space exploration.

Product families

OSA 3350 Series

A new era is beginning in the history of time and frequency delivery. The levels of holdover that have so far been considered sufficient for synchronization infrastructure are no longer enough. As standard bodies such as ITU-T have revisited the specifications of ePRC and ePRTC ...
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OSA 3300 Series

Scientific research and space exploration are examples of fields that increasingly demand more precise and stable timing and synchronization sources. With magnetic cesium approaching the limits of its capabilities, we created our OSA 3300 High-Performance (OSA 3300-HP) and our OSA 3300 Super High-Performance (OSA 3300-SHP) optical cesium clocks ...
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OSA 3250 Series

For decades, magnetic cesium atomic clocks have provided autonomous holdover and protection against GNSS jamming and outages, helping underpin everything from telecommunications and defense systems to power grids and financial networks ...
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OSA 3200 Series

Our OSA 3200 SP makes high-precision timing more accessible. Built on Oscilloquartz’s proven optical pumping cesium technology, it delivers industry-leading accuracy in a compact, cost-effective platform ...
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