SAN MATEO, Calif. Continuing the battle for speed records, an indium phosphide (InP) specialist claims to have run a 1:4 demultiplexer at 80 Gbit/second, besting the 56-Gbit/s mark set by a silicon germanium solution last year.
Startup Inphi Corp. actually ran a 40-Gbit/s clock in InP but managed to get an 80-Gbit/s transmission through the use of a clock doubling technique. IBM Corp. employed the same "half-speed" technique used to reach 56 Gbit/s in a SiGe multiplexer-demultiplexer pair, said Gopal Raghavan, chief technical officer of Inphi (Westlake Village, Calif.).
Inphi ran its experiment specifically to counterbalance the claims IBM and Conexant Systems Inc. have made for SiGe, Raghavan said. Both are developing high-end SiGe processes and have been testing the speed limits of their technologies.
Inphi ran 80-Gbit/s signals through a 1:4 demultiplexer that consumed less than 1.3 watts of power, Raghavan said.
The demultiplexer could be used in live equipment but would not produce the waveform precision required by Sonet. It could be applicable "for short-reach applications where performance doesn't matter very much," Raghavan said.