A free-space optical bus system is described for board-to-board interconnections at the backplane level. The system uses active optoelectronic modules as the interface between the circuit boards and the electrical backplane. Substrate-mode holograms are used to implement signal broadcast operations between boards, and each board on the backplane shares common free-space channels for transmitting and receiving signals. System-design considerations are given, and the potential performance of the optical bus system is evaluated. An experimental demonstration is also presented for the signal broadcast operation through cascaded substrate-mode holograms at a data rate of 622 Mb/s.
© 1996 Optical Society of America
Jang-Hun Yeh, Raymond K. Kostuk, and Kun-Yii Tu, "Hybrid free-space optical bus system for board-to-board interconnections," Appl. Opt. 35, 6354-6364 (1996)