1. Warsaw University of Technology, Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw, Poland
2. Łukasiewicz Research Network─Institute of Microelectronics and Photonics, Al. Lotników 32/46, 02-668 Warsaw, Poland
3. University of South Bohemia, Branisovska 31, 37005 Ceske Budejovice, Czech Republic
4. National Institute of Telecommunications, Szachowa 1, 04-894 Warsaw, Poland