Title :
A novel time-division demultiplexer based on the management of propagation modes
Author :
Narahara, Koichi ; Otsuji, Taiichi ; Sano, Eiichi
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
Abstract :
A novel design methodology is proposed for ultrafast time-division demultiplexers for TDM-based fibre-optic communication systems. The circuit does not have any feedback. Therefore, the maximum speed is not limited by the loopback delay caused by the feedback. The circuit consists of three stages-the retiming stage, the AND processing stage, and the reshaping stage. The stages respectively employ optically controlled phase shifters, a two-conductor coupled line and a traveling-wave FET. The characteristics of each circuitry are investigated by HSPICE or finite difference time domain (FDTD) method. We report the results of the experimental investigations on the AND stage through the ultrafast measurement using electro-optic sampling techniques with an optical pulse pattern generator. The results suggest the potential to yield AND processing of at least 80-Gbit/s
Keywords :
SPICE; demultiplexing equipment; finite difference time-domain analysis; high-speed optical techniques; optical communication equipment; optical fibre communication; time division multiplexing; AND processing stage; FDTD; HSPICE; design; electro-optic sampling; fibre optic communication system; optical pulse pattern generator; optically controlled phase shifter; propagation mode; reshaping stage; retiming stage; time division demultiplexer; traveling-wave FET; two-conductor coupled line; ultrafast measurement; Communication system control; Delay; Design methodology; Feedback circuits; Feedback loop; Finite difference methods; Optical control; Optical feedback; Optical fiber communication; Ultrafast optics;
Conference_Titel :
High Performance Electron Devices for Microwave and Optoelectronic Applications, 1997. EDMO. 1997 Workshop on
Conference_Location :
London
Print_ISBN :
0-7803-4135-X
DOI :
10.1109/EDMO.1997.668587
