GigOptix releases SiGe linear TIA for 40G coherent networks

The GX3122B, which builds on previous GigOptix TIA designs, consists of two balanced linear TIAs integrated on a single silicon-germanium die. The device amplifies weak signals received from photodiodes to drive the analog-to-digital converters (ADCs) and digital signal processor (DSP) in a coherent optical system.

The GX3122B is designed to provide excellent signal fidelity via low total harmonic distortion (THD) over a large dynamic range and the ability to handle the high AC and DC currents seen in coherent receivers.

GigOptix lists the following as key features of the GX3122B:

    Highly integrated device with dual channel TIAs to reduce system complexity and cost
    Increased differential gain of 5K Ohm
    Increased linear gain over 30dB of dynamic range
    Less than 5% THD
    Automatic or manual gain control options
    Peak detection function
    Low power consumption
    Input power monitor
 

"We are very excited to provide an innovative solution for the 40G coherent market which, according to Ovum’s market research, is one of fastest growing segments in the 40G and 100G optical networking market," said Dr. Raluca Dinu, vice president and general manager of the optics product line at GigOptix. "The GX3122B addresses this space uniquely since it was designed in silicon germanium and therefore provides a superior solution in terms of both performance and price. We expect the GX3122B to be a significant contributor to our future growth in the 40G coherent optical market."