Optical Communication System for Wireless Radio Signals
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Abstract
A method of transmission of radio signals over all types of graded-index multimode fibre is provided. The method comprises launching optical radiation into the core of the multimode fibre away from the centre of the core so as to strongly excite a subset of the available modes of the multimode fibre. The subset of modes excited are within a small number of mode groups and thus have similar propagation constants leading to a reduction in modal dispersion and modal interference and smoothing of the frequency response passband region beyond the fibres specified 3 dB base band bandwidth assisting RF transmission and recovery from this region.
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Citations
29 Claims
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1-13. -13. (canceled)
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14. A method of reducing signal loss in an optical signal transmission system using a multimode optical fibre, the method comprising:
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coupling a signal into the multimode optical fibre using a launch at an offset from the fibre axis, wherein the signal is a radio-frequency-modulated signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A radio frequency optical communication system comprising:
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a multimode optical fibre;
a laser transmitter having an input port for causing the laser transmitter to provide radio-frequency modulated optical signals to said fibre; and
a coupler between the laser transmitter and the fibre, the coupler having a launch offset from the fibre axis. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification