Fujitsu Launches Ultra-fast CHAIS ADC for 100G Optical Transport -

Fujitsu Launches Ultra-fast CHAIS ADC for 100G Optical Transport

Langen, Germany – Fujitsu Semiconductor Europe has announced its second generation 8-bit CHArge-mode Interleaved Sampler (CHAIS) ADC for optical transport designs based on coherent detection. The new CHAIS ADC supports data rates from 55 to 65GSa/s and is based on the same ADC architecture as Fujitsu’s 56GSa/s CHAIS ADC in 65nm. It offers ultra-fast sampling rates, wideband input, low noise and high resolution for long-haul links with data rates of 100Gbps and higher over a single wavelength.

Implemented in a high-performance 0.9V 40nm CMOS technology, the 65GSa/s CHAIS ADC surpasses the low power performance of the first generation and will support higher FEC overheads for longer reach. The fundamentals of the CHAIS architecture allow for scalability to even higher sampling rates for future transport data rates (400Gbps/1Tbps) and power dissipation that scales with smaller process feature size. Typical power dissipation for a single CHAIS ADC channel in 40nm is only 1.2W, down 50 percent from the power per channel in 65nm.

Fujitsu’s 4-channel CMOS design allows for more efficient integration with coherent receiver digital cores, typically comprising tens of millions of logic gates and a multi-terabit data transfer rate across the interface between core and ADCs. For the design of single-die transceiver SoCs in 40nm, the Fujitsu IP offering includes high speed 11Gbps SerDes, supporting a range of protocols and data rates, and will also include a complementary high speed 55 – 65GSa/s 8-bit DAC.

In addition to a range of IP blocks to support current and future designs for optical transport, Fujitsu brings key expertise in advanced package design, including patented techniques for thermal management and noise isolation. “Integrating high performance, very low jitter analogue IP with a large, high-current spiking DSP requires careful attention to signal routing and isolation of noise-sensitive circuits”, explained Ian Dedic, Chief Engineer of Fujitsu’s Communications Business Unit. “Fujitsu’s experience in tackling many of the issues facing system and module developers for this type of complex SoC helps to solve real-world deployment issues”.

Fujitsu Semiconductor Europe will be demonstrating the 65GSa/s CHAIS performance at the European Conference on Optical Communications (ECOC) in Turin, Italy later this month. As with the previous generation CHAIS ADC technology, a development kit for the 65GSa/s ADC will be available in January 2011 for customers to evaluate their modulation and FEC algorithm performance using silicon based on field-proven architectures.

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