Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-05-15
1997-08-05
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359135, 370503, 375356, H04B 1000
Patent
active
056548150
ABSTRACT:
Rather than synchronizing clocks between two stations in an optical communication system by correlating a received synchronization signal with an own-station synchronization signal and controlling the own-station clock accordingly, the correlation takes place in one station (EX), but the correlation product is evaluated in the other station (E1-E3), and the clock signal of the latter is controlled accordingly. This may be done by sending a first synchronization bit sequence from a terminal (E1-E3) and looping it back in an exchange (EX) at the bit rate of a second synchronization bit sequence, wherein the clock generator of the terminal (E1-E3) is controlled according to the received correlation bit sequence. This has the advantage at the exchange that synchronization requires only optical switches and no optical-to-electrical transducers. It permits all optical exchanges and eliminates one optical-to-electrical transducer per connected subscriber. The only disadvantage is that for a transmitter without receiver, an additional reverse channel is necessary.
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K. Kiasaleh, et al, "Time and Frequency Transfer Between Master and Slave Clocks" IEEE Transactions on Communications, vol. 38, No. 10, (Oct. 1990), 1900-1912.
Sklar, B., "Digital Communications, Fundamentals and Applications", Prentice Hall, Englewood Cliffs NJ 1988, pp. 429-471.
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ALCATEL N.V.
Negash Kinfe-Michael
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