During my days at Philips Research (1985-1993) we worked on heterodyne-FSK and CPFSK Coherent Optical Transmission systems, at the time offering the highest performance in receiver sensitivity and bandwidth.
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When back at the Nat.Lab. in 2000 my group worked on high-speed 12.5Gbit/s 20x20 cross-connect switches in SiGe BiCMOS technology. As TZA2060 this IC was briefly on the market until the business team was discontinued at the burst of the internet-bubble.
Later 40Gbit/s experiments were done using InP technology. |