Accession Number : ADP007393

Title :   Capacity of Multiwavelength Optical-Star Packet Switches,

Corporate Author : BELL COMMUNICATIONS RESEARCH INC MORRISTOWN NJ

Personal Author(s) : Brackett, Charles A.

Report Date : 22 MAY 1992

Pagination or Media Count : 7

Abstract : We consider here the capacity of multiwavelength optical star networks as applied to high-speed packet switching fabrics. We review the limits of this capacity that are imposed by the optical power budget and the tunable range of the optical components. We also analyze the limitation that is caused by insufficient bandwidth in the switch-control channel which controls the switch-element settings, such as the wavelength settings of the output port receivers. We find that this limited switch-control bandwidth can be a major factor limiting the switch capacity, and that the packet length and the control-channel bit rate are key parameters. A comparison is made of coherent and direct detection as applied to such networks, with the finding that for ATM (Asynchronous Transfer Mode) coherent detection is not required since the switch capacity is not (for the parameters assumed) limited by the power budgets. For the case of longer packets, however, a much higher capacity can be achieved with coherent than with direct detection. Overall capacities ranging from several hundred Gbits/s to greater than one Tbit/s are projected.

Descriptors :   *OPTICAL SWITCHING, *ELECTRONIC SWITCHES, BANDWIDTH, CHANNELS, COMPARISON, CONTROL, DETECTION, LENGTH, LIMITATIONS, NETWORKS, OUTPUT, PACKET SWITCHING, PARAMETERS, POWER, RATES, RECEIVERS, STARS, TRANSFER, VELOCITY, QUICK REACTION.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE