A 10- GHz 8- b Mu1 t iplexer /D emu1 t iplexer Chip Set for the SONET STS-192 System

An ultrahigh-speed 8-b multiplexer (MUX) and demultiplexer (DMUX) chip set has been developed for the synchronous optical network (SONET) next-generation optical- fiber communication systems, which will require data bit rates of about 10 Gb/s. These IC's were designed using three novel concepts: a tree-type architecture giving reliable operation, a dynamic divider with a wide operating range, and a 50-fl on-chip transmission line with high-speed pulse propagation. They were fabricated using a 0.5-pm WN,-gate GaAs MESFET process. The DMUX and MUX operated up to 10.4 and 11.4 GHz, respectively, both with an adequate phase margin of more than 230".

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