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Phyworks integrates more functions into 10G transceiver

LONDON — Optical component specialist Phyworks (Bristol, England) has started sampling a single chip transceiver in CMOS that integrates a temperature sensor and diagnostic reporting.

The company will be demonstrating the part at this week's European Conference and Exhibition on Optical Communications (ECOC) in Vienna, Austria.

Targeted at 10GBASE-SR and 1G to 8G Fiber Channel SFP+ optical applications, the device, dubbed the PHY3070, can be used with an external junction-temperature monitoring transistor to improve module temperature sensing accuracy and thus reduce measurement variance due to the influence of IC temperature.

The device combines enhanced diagnostics with a 1 to 10.6Gbits/s VCSEL driver and a high performance, limiting amplifier targeting , and will target sub 750mW modules.

Reporting of temperature, transmit power, bias current and other functions in the integrated device will be via the chip's two-wire serial interface, with only a low cost 8-bit microcontroller now required for SFF-8472 compliant digital diagnostics monitoring and device setup.

The transmitter output stage will drive four-terminal VCSEL TOSAs differentially using AC coupling and provides comprehensive safety shutdown functions.

The driver delivers a maximum peak-to-peak modulation current of 12mA and offers two laser control modes: open loop or digital mean-power, the latter using an integrated automatic power control (APC) loop which further reduces the functions and cost of an external microcontroller and improves start-up time by removing an external interface and associated delay.

The transceiver comes in a 32-pin 5mm x 5mm QFN package or as bare die, and with an operating temperature range of -40ºC to +95ºC. It is supported by a reference module, schematics, Gerber files, SFP+ host board with GUI and firmware.

** Separately, Phyworks has been voted fifth in the annual survey of the U.K.’s fastest growing, privately held technology companies. The TECH TRACK 100 is compiled by Oxford, England based Fast Track.

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