H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
325/1, 344/25
H04Q 11/04 (2006.01) H04Q 11/00 (2006.01)
Patent
CA 1252821
- 58 - PHOTONIC SWITCHING Abstract A method and apparatus are disclosed for implementing an optical communication network wherein switchable information signals are retained in the optical mode. Sources of optical signals, destinations for optical signals, and intermediate photonic switches are interconnected by optical links, each link comprising two unidirectional transmission optical fibers. An optical bit stream generated at a source of optical signals comprises repetitive time frames. Each time frame includes a frame synchronizing signal and a plurality of signal groups of information bits separated in time by a route switching interval. The optical bit streams entering a photonic switch are frame synchronized. A particular group of information bits retains its position in time within a frame from the source of the optical signal to its destination. The photonic switch is set up during a route switching interval for transmission of a group of information bits from an input to an output of the photonic switch. Advantageously, in such a network optical signals need not be converted to electrical signals as they traverse communication links from a source to a destination.
530342
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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