Abstract: A packet switch architecture that can switch optical packets at high throughputs without using any random access memory, without fragmenting variable length packets into fixed length fragments and reassembling them, and without converting the optical packets into electronic packets. Programmable delay lines are use which delay the output of each packet for a programmable amount which may be re-programmed while the packet is being delayed by the programmable delay line. Programmable delay line controllers manages the delays imposed by the programmable delay lines so as to have a look-ahead phase during which information about the packets is gathered and a shift phase during which the sequence of packets is shifted to match an output sequence.

Abstract: A packet switch architecture that can switch optical packets at high throughputs without using any random access memory, without fragmenting variable length packets into fixed length fragments and reassembling them, and without converting the optical packets into electronic packets. Programmable delay lines are use which delay the output of each packet for a programmable amount which may be re-programmed while the packet is being delayed by the programmable delay line. Programmable delay line controllers manages the delays imposed by the programmable delay lines so as to have a look-ahead phase during which information about the packets is gathered and a shift phase during which the sequence of packets is shifted to match an output sequence.

Abstract: An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the data from each user with a spreading code assigned to that user. Each spreading code includes a unique sequence of T time chips along a time axis. The data from each user is representable by T symbols. The OCDMA system further includes an optical receiver system configured to demodulate the data from each user by correlating signals received from the transmitter system with the spreading code assigned to that user. When transmitting a data symbol for each user, the transmitter system selects one out of T distinct cyclic shifts of the spreading code assigned to that user, and transmits the selected cyclic shift of the assigned spreading code along the time axis.

Abstract: Systems and techniques to optically boost a router. In general, in one implementation, the technique includes: receiving an optical signal defining a packet of data, initiating electronic routing of the optical packet, and initiating optical routing of the optical packet. The optical routing involves determining forwarding information based on a routing field in the optical packet, and if optical forwarding is available, terminating the electronic routing of the packet before completion of the electronic routing, and forwarding the optical signal, which defines the packet, based on the determined forwarding information.

Abstract: Systems and techniques to optically boost a router. In general, in one implementation, the technique includes: receiving an optical signal defining a packet of data, initiating electronic routing of the optical packet, and initiating optical routing of the optical packet. The optical routing involves determining forwarding information based on a routing field in the optical packet, and if optical forwarding is available, terminating the electronic routing of the packet before completion of the electronic routing, and forwarding the optical signal, which defines the packet, based on the determined forwarding information.

Abstract: A computer architecture which significantly reduces latency in fetching instructions from main memory includes a code-pump located proximate to the memory and a filter cache located proximate to the processor. The code pump reduces latency in fetching instructions by predicting possible instruction streams that may be executed by the processor and passing instructions from all possible streams to the filter cache. The code pump fetches instructions from the memory and partially decodes the instructions to determine their types. Instruction types which may change the flow of the program such as subroutine calls and conditional branches, cause the code pump to concurrently supply instructions from all flow paths that can be predicted from these instructions. To keep track of the possible flow paths, the code pump maintains a data structure which is a combination of multiple stack entries (for call instructions) and tree entries (for branch instructions).