H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/24 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2421542
A system and method for bidirectional optical transmission in one optical fiber with large transmission capacity, enabling the enlargement of transmission distance. Downward optical signals sent from one or more downward optical signal transmitters are received by one or more downward optical signal receivers via an optical fiber transmission line and upward/ downward signal separating multiplexer - demultiplexers. On the other hand, upward optical signals sent from one or more upward optical signal transmitters are received by one or more upward optical signal receivers by following the opposite route. Output signals from the downward optical signal transmitter leak in the upward optical signal receiver via the upward/ downward signal separating multiplexer - demultiplexer. However, there is a large difference between the frequency of the upward optical signals and that of the downward optical signals, and beat/ noise components produced by interference in the two wavelengths are present outside the band of the upward optical signal receiver, thus avoiding the influence of coherent crosstalk. Additionally, power crosstalk also does not become a problem because of large isolation.
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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