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Vitesse solution enables deployment of IEEE-compliant GE-PONs

Posted: 12 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vitesse semiconductor vsc7716? transimpedance amplifier vsc7966? vsc7966 laser driver? TIA limiting amplifier? gigabit ethernet PON?

VSC7966 laser driver and limiting amplifier

Vitesse Semiconductor Corp. unveiled its VSC7716 burst mode transimpedance amplifier (TIA) and VSC7966 laser driver and limiting amplifier designed for Gigabit Ethernet passive optical networks (GE-PONs).

The VSC7716 and VSC7966 are the latest in a family of products from Vitesse designed for the Fiber-to-the-Home (FTTH) market. According to Brad Sakai, product marketing manager for Vitesse's Network Products Division, the shift from copper wires to optical fiber in networking can clearly be seen, most especially in Asia. "Japan is leading in the deployment of FTTH, while Korea and China are starting to begin deployment," Sakai said.

The two new products, when combined with a laser, provide a complete GE-PON Optical Line Termination (OLT) module solution enabling, for the first time, deployments of GE-PON systems that meet the rigorous requirements of the IEEE standard, said the company.

Operating at a 1.25Gbps data rate, GE-PON (aka EPON) is defined by the IEEE 802.3ah standard for FTTH applications. It utilizes the same packet framing and data encoding scheme from the Gigabit Ethernet protocol (IEEE 802.3z), which, Vitesse said, simplifies the design and deployment of systems and takes advantage of Ethernet economies of scale. "PON is by far the leading technology for FTTH as it offers lower deployment and operating costs, as well as higher reliability," Sakai added.

New GE-PON solution
The new VSC7716 is touted to be the first commercially available burst mode TIA to simultaneous exceed the 20km GE-PON specification for overload, dynamic range and sensitivity. The device's inputs can be connected single-ended or differentially, which allows the TIA to work both with an APD or PIN photo detector in a standard 5-pin TO-46 package. With an APD, the typical settling time for the VSC7716 is 100ns. Additionally, the VSC7716 supports a dynamic range of 30dBm and input overload power of greater than -3dBm. The increased dynamic range and overload power can reduce test time and offer greater implementation flexibility, resulting in lower product and implementation costs.

According to Sakai, the VSC7716 burst mode TIA has been designed with extra margin so that tests can be eliminated, reducing test time.

Meanwhile, the VSC7966 is a monolithic, continuous mode, DFB/FP laser driver and limiting amplifier for PON and SFP applications. The company said that the integration of the laser driver and limiting amplifier reduces the external component count leading to an even lower BoM. "Being cost effective does not just mean low price," Sakai stressed. "It also means reduction in design and test and calibration time, and lower BoM costs."

The VSC7966 supports 80mA of bias and modulation currents with a closed loop, automatic power control circuit and support for extinction ratio control, and features a digital SPI control interface to access both control and diagnostic parameters.

Priced at $5.45 for production quantities, the VSC7716 is sold as bare die, with samples already available. The VSC7966 will be priced under $2 in production volumes. Samples of the VSC7966 is scheduled in October 2005.

- Margarette Teodosio
Electronic Engineering Times-Asia

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