Fujitsu Microelectronics Issues Technical Paper on 56GSa-s ADC Technology

Fujitsu Microelectronics America, Inc. (FMA) has published “The Fujitsu 56GSa/s Analog-to-Digital Converter Enables 100GbE Transport,” a technical paper that outlines the technological challenges associated with the deployment of long-haul optical transport networks.

The paper also describes Fujitsu’s CMOS Analog-to-Digital Converter (ADC) technology developed for 100Gbps coherent receivers used in OTU-4 transport systems and 100 Gbps Ethernet.

Each 100Gbps coherent receiver incorporates a tera-OPS DSP and four 56GSa/s ADCs. The factors driving the development of single-chip CMOS solutions for coherent receivers have been explained in the paper. The paper gives details on the company’s CHArge-mode Interleaved Sampler (CHAIS) technology as well. The CHAIS technology permits the implementation of fast, high-resolution ADCs in CMOS processing technology, making it possible to meet the requirements of long-haul optical transport networks with respect to power and performance.