• M. Seimetz, “Optical IQ-transmitter with a serial IQ-modulator”, utility patent at the German Patent and Trade Mark Office, DE 20 2006 000 197.2, 2006.
  • M. Seimetz and R. Freund, “Optical multi-format transmission system”, utility patent at the German Patent and Trade Mark Office, DE 20 2006 007 966.1, 2006.
  • M. Seimetz, “Optical receiver for reception of M-ary star-shaped quadrature amplitude modulation with differentially encoded phases and its application, patent granted at the German Patent and Trade Mark Office, DE 10 2006 030 915.4, 2006.
  • M. Seimetz, “Optical receiver for reception of M-ary star-shaped quadrature amplitude modulation with differentially encoded phases and its application, applied for in the USA.