Lucent Technologies Inc.

Richard G Rozier

Ashok V Krishnamoorthy

Anthony L Lentine

Fouad E Kiamilev

A switch, of the crossbar type, in which no clock recovery is undertaken. Multiple optical fibers deliver input signals to a single semiconductor die. The die contains circuitry which selectively connects each input fiber to a respective output fiber, which carries the signals off the die, to their destinations. The communication is asynchronous: no continuous clock signal accompanies the incoming data. However, periodic sequences of clock signals accompany the incoming data, and are used by circuitry on the die in &ldquo;clock recovery&rdquo; routines, to generate local clock signals. The invention eliminates the need for local clock recovery: the incoming signals are routed through the die to outgoing fibers, without generation of a local clock signal on the die.

Asynchronous transfer of high speed data signals through an optoelectronic VLSI switch

A high-performance photonic chipset for computing 1-D complex fast Fourier transform (FFT) calculations. Flip-chip integration is used to combine submicron CMOS ICs with GaAs chips containing 2-D arrays of multiple-quantum wells (MQW) diode optical receivers and transmitters on each chip in the set. Centralized free-space optical interconnection offers higher throughput rates, greater external bandwidth and reduced chip count compared to conventional electronic FFT devices using hard-wired interconnection between chips. The memory addressing used provides one-to-one interconnections for memory transfers between computational stages that are compatible with several known three-dimensional free-space optoelectronic packaging technologies and dual-port memory is used to permit simultaneous read-write access to adjacent addresses in the data banks needed by each stage.

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Middletown, NJ, United States of America

Richard G Rozier