Fujitsu to display 28-nm CMOS ADCs at OFC
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Fujitsu to display 28-nm CMOS ADCs at OFC
Fujitsu Semiconductor Europe (FSEU), which was among the first to offer the high-speed analog-to-digial converters (ADCs) and digital-to-analog converters (DACs) necessary for coherent transmission of optical signals (see "Fujitsu launches ADC technology for 100G"), will display next week the first results of its converter work in 28-nm processes at OFC/NFOEC in Anaheim, CA.At the show, FSEU will display an ADC that supports sampling rates from 55-70 GSa/s with scalable analog bandwidth. The company says it has a companion DAC that serves the same rates that will follow “shortly.” Meanwhile, the company also has additional 28-nm CMOS converters in the pipeline for release this year that will support sampling rates ranging from 28 to greater than 90 GSa/s.The converters can be used in several channel-count configurations, and all variants will be 8-bit and scale down in power based on sampling rate, according to the company. The use of 28-nm processes will lower the cost and improve the efficiency of the devices versus chips made from older CMOS processes, making the the semiconductors particularly suitable for price-sensitive metro applications as well as long-haul fiber-optic networks, FSEU says. The company also has its eye on products that support inter- and intra-data center optical links for 100-Gbps Ethernet over a few hundred meters to interconnect across a PCB or a backplane channel.
CoAdna CWDM WSS targets enterprise and data centers
Wavelength-selective switch (WSS) specialist CoAdna Photonics, Inc. has unveiled a new WSS series that operates over the entire CWDM band. It is designed to provide wavelength switching for all sets of CWDM transceivers under either ITU standard channel spacing or any customized channel spacing. It also is “empowered” by the software-defined networking (SDN) movement, CoAdna says.While typical WSSs cover the C-Band for use in long-haul and metro DWDM networks, the new CWDM WSS series is designed specifically for enterprise and data center networks where CWDM transceivers are more commonly used. CoAdna envisions a growing interest in such modules as bandwidth increases cause data center networks to adopt flattened fiber-optic network infrastructures. They will be available in both 1xN and Nx1 configurations.CoAdna has based the modules on its LightFlow platform, which leverages the advantages of liquid crystal technology to provide high reliability and low power consumption.“CoAdna strives to provide complete ROADM solutions to our customers. We are committed to continuous product innovations that address future network needs.” asserts Dr. Jack Kelly, CTO of CoAdna. “With the CWDM WSS product series, we will be able to supply a complete WSS solution to the optical networking industry, covering applications from long-haul core to intra-data center networking.”
AppliedMicro tallies 100G coherent design wins for S28032 mux chip
Applied Micro Circuits Corp. (NASDAQ: AMCC) says that its CMOS-based S28032 multiplexer chip is integral to the 100-Gbps coherent transmission designs of eight of the world's largest optical module manufacturers and systems companies. That fact that its use of CMOS translates into half the power consumption of competitive SiGe devices is a major reason for the multiplexer chip’s success, AppliedMicro sources say."As the first company to design a transmitter with this speed and performance in a CMOS process, we have changed the economics of deploying 100G coherent transmission solutions that are needed to fuel the widespread deployment of 100G OTN networks," said George Jones, vice president and co-general manager, Connectivity Products, at AppliedMicro via a press release. "CMOS solutions enable much lower power and, in turn, enable the delivery of more thermally efficient optical modules for operational cost savings and improved reliability."The S28032 multiplexer chip operates up to 31.8 Gbps, dissipates less than 4 W, and supports polarization-multiplexed, quadrature phase-shift keying (PM-QPSK). In addition to the power savings, the use of CMOS also results in greater reliability than SiGe-based alternatives can provide, Jones told Lightwave.Acacia Communications, which publicly unveiled its AC100 coherent 100-Gbps transponder last year (see “Acacia Communications details 100-Gbps coherent optical module”), is the only customer whose name AppliedMicro has revealed so far. "AppliedMicro has achieved a significant milestone by delivering this level of performance with a low power profile in CMOS technology, enabling higher quality and yield than older technologies," said Benny Mikkelsen, co-founder and CTO of Acacia Communications, in the same press release. "We're impressed by AppliedMicro's speed of design to production for this product. By deploying the S28032 multiplexer in our coherent modules, we can drive down the cost, size, and power requirements of our solutions, and fuel the rapid deployment of 100G connectivity in metro, regional and long-haul networks."The S28032 is now in production. It has both CAUI and SFI-S interfaces. The input lanes are multiplexed into four lanes that operate from 28 Gbps to 32Gbps, to support various forward error correction (FEC) implementations. The device supports both hard- and soft-decision FEC, including proprietary approaches, AppliedMicro says."System vendors are seeing healthy demand for 100G on long-haul and metro DWDM line-side applications," said Vladimir Kozlov, founder and CEO at market research firm, LightCounting. "The number of 100G DWDM ports deployed per year is projected to triple by 2014. In addition, the potential opportunity for 100G transceivers in data centers is even larger, but lower cost and power consumption will be critical for data-center applications."
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