Sub-Nyquist sampling refers to techniques that acquire signals below the Nyquist rate by exploiting signal sparsity. At NEC Labs America, sub-Nyquist methods are used in optical communication and sensing to reduce bandwidth requirements while preserving accuracy. This enables efficient monitoring of high-frequency signals and supports applications in distributed acoustic sensing and optical networking. Sub-Nyquist research contributes to scalable, cost-effective sensing and communication platforms.
We jointly estimate the phase noise power spectral densities of multiple lasers using interferometry between different combinations of laser pairs. We demonstrate a beat-frequency trackingmethod that allows under-sampling of interferometric products without phase jumps.
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NEC Laboratories America, Inc. (NEC Labs) is the US-based center for NEC Corporation’s global network of corporate research laboratories. Our diverse research groups collaborate with industry, academia and governments to provide disruptive solutions to complex problems. A leader in the integration of IT and network technologies with more than 100 years of expertise, NEC provides a combination of products and solutions that cross-utilize the company’s experience and global resources to meet the complex and ever-changing needs of its customers.