H - Electricity – 04 – B
Patent
H - Electricity
04
B
88/114, 88/97.2
H04B 10/12 (2006.01) G02B 6/14 (2006.01)
Patent
CA 1303395
Abstract of the Disclosure A single-mode transmission optical fiber may have a bandwidth much greater than that necessary to transmit a desired predetermined maximum data rate. The single-mode fiber is connected to a bandwidth limiting device comprising the serial combination of an input optical fiber, a mode converter and multimode fiber. If the multimode fiber is capable of propagating two modes, for example, the mode converter converts the LP01 signal from the transmission fiber to the LP01 and LP11 modes. These two modes propagate at different speeds through the multimode fiber. Means connected to the output end of the multimode fiber detects the two modes. If the time delay difference .DELTA.T between the two modes is small with respect to the width of a pulse in the transmitted pulse train, the pulse train will be detected without distortion. Transmission at a higher data rate causes .DELTA.T to be large with respect to pulse width. Thus, a transmitted pulse causes the generation of a false pulse, whereby operation at the higher data rate is impossible. Also disclosed are methods of making suitable mode converters.
554111
Bhagavatula Venkata A.
Corning Glass Works
Gowling Lafleur Henderson Llp
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