SiGe presents optical ICs for low-voltage 10/12.5Gbit/s systems

12 February 2003 -- SiGe Semiconductor, Ottawa, Canada, has added the SE1052W transimpedance amplifier (TIA) and the SE1250L limiting amplifier to its LightCharger series of optical interface components.

Feb 12th, 2003

12 February 2003 -- SiGe Semiconductor, Ottawa, Canada, has added the SE1052W transimpedance amplifier (TIA) and the SE1250L limiting amplifier to its LightCharger series of optical interface components.

The devices suit fibre-optic modules used in next-generation datacom and telecom equipment supporting SONET/SDH, OC-192, STM-64, fibre channel and 10G Ethernet communication.

The SE1052W TIA works with SiGe's SE1250L, claimed to be the highest bandwidth, lowest power 12.5Gbit/s limiting amplifier available. Combined, the components address a growing requirement for data communications equipment operating at 3.3V.

Manufactured using a silicon-germanium process, the devices achieve the performance of GaAs or InP, at "a fraction of the cost and power dissipation", says SiGe. This increases the number of components that can be used on a single shelf.

Imran Sherazi, product line manager, SiGe Semiconductor, said, "With these devices, we hope to enable effective equipment design for broadband deployments as the market recovers and service providers proceed with the Metro build out."

Sige's SE1052W is a fully integrated 10/12.5Gb/s TIA, offering a dynamic range of -22dBm to +1dBm, and 3.7k ohms of differential transimpedance. The device supports a current load of 2.6mA, and optimised input noise density of 10pA/Hz(exp-2). Capable of swinging up to 300mV peak-to-peak into a 100 ohm load, the device provides sufficient drive for a post amplifier or direct input into a serializer-deserializer. The SE1052W has a low power dissipation of 180mW.

With 15GHz of bandwidth, the SE1250L offers enough margin to prevent TIA bandwidth roll-off and therefore provide excellent electrical eyes. The device also features a signal gain of 33dB differential, and a noise figure of <12dB, allowing stable control in telecom and datacom applications.

Both devices operate using a single 3.3V supply, and are configured for fully differential outputs. The low power consumption and high integration make SiGe's new ICs ideal for small form factor 10Gb/s optical receivers, and short-reach transponders including those compliant to the recently signed multi-source agreement for XPAK and XFP.

The SE1052W is supplied as a bare die solution priced at less than USD50 in bulk. The SE1250 is packaged in 16-pin QFN, priced at less than USD60 in production quantities.

More in Optical Tech