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PON driver touts integration

Posted: 15 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vitesse semiconductor? passive optical network? pon? cmos chip? cmos?

Vitesse Semiconductor Corp. has offered interface devices for passive optical networks (PONs) before, but the CMOS chip shown at last week's Optical Fibers in Communications (OFC) conference represents an integration milestone. The VSC7965 pairs a limiting amp with a driver and is designed to be integrated into low-cost transmit optical subassemblies for residential PONs.

In the past, such devices have been implemented in silicon germanium (SiGe), but CMOS is proving capable of handling many functions previously reserved for SiGe or gallium arsenide, according to Vitesse. The new device offers selectable on-chip resistors for output photocurrent monitoring, and the resistor matrix can be programmed directly through the on-chip digital interface.

The VSC7965 also integrates eye-safety logic to meet all international eye-safety requirements for active lasers, the company said.

The chip supports a variety of PON data rates so that a single chip can be stocked to populate modules supporting broadband, Ethernet and Gigabit PONs and the like. The burst-mode enable interfaces also are programmable, so that the driver can be used with media-access control chips supporting such I/Os as LVDS, LVTTL and LVPECL.

During the OFC show, Vitesse also exhibited a special evaluation board it calls PON Pro. The full-size four-layer board is laid out so that all components, including the 7965, a microcontroller and a full fiber diplexer, fit inside the area that would be occupied by a small-form-factor optical module.

Vitesse is offering two Atmel MCUsthe ATmega88 or the ATtinyXX-as options for digital diagnostics and digital tuning of the laser.

Vitesse aims to have the VSC7965 out in production quantities by June, when it will be priced at less than $2.30 each in high volumes.

- Loring Wirbel

EE Times

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