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.

• 2.5GHz balanced (noise cancelling) optical front-end
• co-development of photo diodes with Philips LEP (Limeil-Brevannes)
• wide band (1GHz) frequency discriminator
• electronic system integration
• system measurements
• theoretical analysis detection mechanism and sensitivity penalties (which resulted in my PhD thesis with prof. Jens Arnbak in Delft, and the book "Coherent Optical System Design" at John Wiley & Sons.)
• work resulted in 10 patents, 15 conference papers (ECOC, OFC), 15 scientific papers (IEEE, IEE) and 20 other publications

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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.

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Since July 2015 I am Supervisory Board member of the Eindhoven start-up company Effect Photonics, which develops highly innovative 10x10 Gbit/s WDM CFP/2 modules using highly integrated InP Optical Integrated Circuits. Already 30 years in Optical Communication and Photonics!

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