Phyworks offers 10GEPON XFP reference design

JANUARY 29, 2009 -- Compatible with existing 10G EPON MAC evaluation boards, the reference module is intended to enable FTTx system and optical module manufacturers to evaluate the 10G Phyworks chipset in advance of final ratification of the IEEE802.3av 10G EPON standard.

JANUARY 29, 2009 -- Phyworks (search for Phyworks) has begun shipping a 10G EPON XFP transceiver demonstration module for optical networking unit (ONU) applications. Compatible with existing 10G EPON MAC evaluation boards, the reference module is intended to enable FTTx system and optical module manufacturers to evaluate the 10G Phyworks chipset in advance of final ratification of the IEEE802.3av 10G EPON standard.

The Phyworks demonstration module supports single-channel asymmetric transmit and receive (1.25-Gbps burst mode on the upstream and 10 Gbps on the downstream) with sensitivity greater than -30 dBm at 1e-3 bit-error rate. The XFP receive path uses the PHY1090 10-Gbps trans-impedance amplifier with the PHY1060 10-Gbps integrated post amplifier, equalizer, and retimer. The transmit path uses the PHY2078 1.25-Gbps burst-mode laser driver.

Phyworks says its chipset addresses distortion in the module connector, which it describes as a significant challenge for asymmetric 10G ONU design. Traditionally, separate clock recovery ICs are required to reduce the resulting jitter in the ONU. The PHY1060 removes this requirement by integrating a re-timer that is designed to ensure a high-quality, low-jitter output from the XFP module which, when combined with the optional pre-emphasis stage, enables error-free 10G serial data transmission through the connector and PCB to the ONU MAC, the company asserts. In SFP+ applications, the PHY1060 equalizer and re-timer will also compensate for 10G inter-symbol interference from the copper trace and connector, thus enabling both XFP and SFP+ form factors to be used for a 10G ONU.

A second challenge addressed by the Phyworks chipset is dispersion that can degrade a 10G signal when transmitted over long fiber runs using a standard low-cost laser such as a distributed feedback laser (DFB). The company says its patented equalizer technology in the PHY1060 allows users to include lower-cost and higher launch power DFB lasers in the central office optical line terminal (OLT), thereby extending network reach and increasing ONU sensitivity margins.

Phyworks' 10GEPON XFP transceiver demonstration module is available now.

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