LONDON Communications chip specialist Phyworks (Bristol, England) is launching at the Optical Fibre Communications expo in San Diego, California, a CMOS retimer with EDC that offers 10G Ethernet performance in legacy fibre infrastructure as well as laser driver for small form factor modules operating at between 125Mbit/second and 1.25Gbit/second.
"The retimer incorporates our second generation Electronic Dispersion Technology, and we are about to start shipping evaluation boards to selected customers, mainly in South Korea and Japan" Stephen King, Phyworks' CEO told EE Times .
King says the industry has been talking about 10G for a considerable time, but the recent announcement by Cisco of the 7000 Series data centre switch has given the sector a great deal of impetus, with the shift going from 48 port 1Gbit/s SFP line cards to 32 port 10Gbit/s SR/SFP modules plus a line card.
Manufactured on a 0.13 micron CMOS process, by TSMC, the chip, dubbed the PHY2060 is said to be smaller in size than alternatives and is easier to integrate with other devices. The part enables simple upgrade of X2 and XFP optical modules and SFP+ based line cards to true 10Gbits/s LRM operation.
The 2060 offers "great LRM performance" according to King, combining clock data recovery (CDR) and a fully automatic EDC circuit, both of which offer much simpler optical module design. The chip's internal algorithms remove the need for complex microcontroller support and thereby substantially reduce product development time.
King says Phyworks' module adaptation using its proprietary LRM compliant EDC technology is 100 times faster than one particular offering, the Vitesse Big Bear EDC. "That is a 7mm by 7mm chip and has two 8-bit microcontrollers to support the EDC chip; we have shown ours is significantly faster as we can measure how quickly it can recover when changing stresses. It is also a more elegant and cost effective solution, and is suitable for the really small form factor XFP+ modules."
King adds the major 10G module makers such as Avago, Finisar and Opnext are all evaluating the 2060.
Meanwhile, the tightly integrated laser driver and limiting amplifier IC for small form factor optical modules, dubbed the PHY1040, is said to be the first of its type to support both VCSEL and continuous mode DFB and FP lasers for DDM and non-DDM applications. Phyworks says it will also be the first be offered at $1 in "reasonable" volumes.
"We are simplifying the whole design and manufacturing process for module makers across multiple data rates" said King. He adds the 1040 significantly reduces component cost and PCB size.
The device is made in a SiGe process by Jazz Semiconductor in Newport Beach
King commented:"With the rapid worldwide growth in IP based access, metro and core networks, the needs of higher data rate video applications and the proliferation of Gigabit Ethernet ports, there was a clear need for a new generation of ICs to sustain the drive to lower cost optical modules."
The 1040's selectable driver output stage can either be configured as a common anode VCSEL driver, providing a modulation current up to 30mA and a bias current of 20mA, or as a continuous mode laser driver, providing a peak modulation current of up to 80mA and bias current of 90mA. Bias can be controlled in either a closed loop mode using a cost-saving integral APC loop or in an open loop mode using a temperature indexed look-up table.