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July 12, 2005 Camarillo, CA -- Vitesse has introduced its VSC7716 burst mode transimpedance amplifier (TIA) and its VSC7966 laser driver and limiting amplifier for Gigabit Ethernet Passive Optical Networks (GEPONs). According to the company, designed for FTTH applications, the two devices, when combined with a laser, enable a complete GEPON optical line termination (OLT) module platform, supporting deployments of GEPON systems meeting IEEE-standard requirements.
According to the company, designed for use in a GE-PON OLT, the VSC7716 is among the first commercially available burst mode TIAs to simultaneously exceed the 20-km 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 100 ns. The VSC7716 supports a dynamic range of 30 dBm and input overload power of greater than -3 dBm. The company says the device's increased dynamic range and overload power reduces test times and offers greater flexibility of implementation.
The company calls the VSC7966 a monolithic, continuous mode, DFB/FP laser driver and limiting amplifier for PON and SFP applications. For GE-PON applications, the limiting amplifier has a fast acquisition time, enabling it to recover burst data. The laser driver supports 80-mA of bias and modulation currents with a closed loop, automatic power control circuit, and support for extinction ratio control. The integration of the laser driver and limiting amplifier is designed to reduce external component counts. The VSC7966 features a digital SPI control interface to access both control and diagnostic parameters. The SPI also enables automated testing.
Defined by the IEEE 802.3ah standard for FTTH applications and operating at data rates of 1.25-Gbit/sec, GE-PON systems utilize packet framing and data encoding schemes borrowed from the IEEE 802.3z Gigabit Ethernet protocol, simplifying the design and deployment of FTTH systems.
The VSC7716 is sold as bare die, with samples available now. The device is priced at $5.45 in production quantities. The VSC7966 will be priced under $2.00 in production volumes, with samples available in October 2005.
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