| 摘要 |
The invention relates to an optical communication system (10; 300) and a method of operating the system (10; 300) to reduce non-linear optical phenomena in optical fibre waveguides (60, 70; 350, 360) included within the system (10; 300). The communication system comprises a plurality of nodes (20, 40; 310, 330) coupled together by optical fibre waveguides (60, 70; 350, 360) for guiding communication traffic bearing radiation between the nodes. The system (10; 300) further comprises: <SL> <LI>(a) a modulator for modulating optical radiation in a first node (20; 310) of the system (10; 300) with communication traffic to generate corresponding modulated radiation; <LI>(b) an attenuator and associated optical amplifier (110, 120; 410, 420) for regulating radiation power of the modulated radiation at the first node to generate corresponding output radiation; <LI>(c) a coupler (130; 430) at the first node for emitting the output radiation into the fibre waveguide (60; 350) propagation to a second node of the system (10, 300); <LI>(d) a coupler (180; 480, 500) at the second node for receiving the output radiation emitted from the first node and conveyed through the fibre waveguide (60, 350); <LI>(e) a power monitor (210; 490) at the second node (40; 330) for measuring radiation power of the output radiation received at the second node and for generating corresponding power indicative data; and <LI>(f) a power controller (160; 520) for receiving the power indicative data and using it to regulate the radiation power measured at the second node to a predetermined level by generating corresponding error data and communicating the error data to the attenuator (110; 410) for controlling the attenuator (110; 410) so that the radiation power measured at the second node is stabilized substantially at the predetermined level at which optical non-linearities are reduced to less than a predetermined threshold in the fibre waveguide (60; 350). </SL>
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