Multiplex communications – Wide area network – Packet switching
Patent
1987-11-20
1989-03-28
Sikes, William L.
Multiplex communications
Wide area network
Packet switching
350 9616, 350320, 370 3, 365 64, 365 73, 365 76, G02B 626, G11C 2100, H04B 900
Patent
active
048158046
ABSTRACT:
A fiber optic recirculating memory comprises a splice-free length of optical fiber which forms a loop that is optically closed by means of a fiber optic coupler. The coupler couples an optical signal input pulse to the loop for circulation therein, and outputs a portion of the signal pulse on each circulation to provide a series of output pulses. A pump source is included to pump the fiber loop with a pump signal having sufficient intensity to cause stimulated Raman scattering in the fiber loop, and thereby cause amplification of the circulating signal pulse. The fiber characteristics, coupler characteristics, and pump power are selected to yield a Raman gain which compensates for the total round-trip losses in the fiber loop, so as to provide an output pulse train of constant amplitude pulses. The invention may be implemented utilizing either a standard coupler or a multiplexing coupler. The multiplexing coupler advantageously permits independent selection of the coupling ratios for the pump signal and signal pulse, thereby allowing these coupling ratios to be selected for minimum loop loss and maximum pumping efficiency.
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Desurvire Emmanuel
Digonnet Michel J. F.
Shaw H. J.
Healy Brian M.
Sikes William L.
The Board of Trustees of the Leland Stanford Junior University
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