Multiservice optical communication
First Claim
Patent Images
1. :
- A method of optical communication using a multimode fibre, the method comprising;
using one or more optical radiation transmitters, coupling optical radiation into the multimode fibre using a launch which restricts the number of modes excited in the fibre such that background noise is suppressed in the demodulated signals, wherein the, or each, optical radiation transmitter is a single- or multi- transverse mode laser transmitter driven by a combination of modulated radio frequency signals and/or baseband signals.
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Abstract
A method is provided for the transmission of digital and radio frequency signals, for example for multiservice applications, over all types of multimode optical fibre link using laser diodes. The method comprises launching optical radiation into the core of the multimode optical fibre, in a manner that restricts the number of excited modes within it. The subset of modes that are excited suppress additional noise due to the presence of a multiplicity of signals, and ensure high quality transmission.
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Citations
23 Claims
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1. :
- A method of optical communication using a multimode fibre, the method comprising;
using one or more optical radiation transmitters, coupling optical radiation into the multimode fibre using a launch which restricts the number of modes excited in the fibre such that background noise is suppressed in the demodulated signals, wherein the, or each, optical radiation transmitter is a single- or multi- transverse mode laser transmitter driven by a combination of modulated radio frequency signals and/or baseband signals. - View Dependent Claims (2, 3)
- A method of optical communication using a multimode fibre, the method comprising;
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4. :
- An optical communication system comprising;
one or more optical radiation transmitters;
a means of coupling optical radiation from the, or each, optical radiation transmitter into a multimode fibre using a launch which restricts the number of modes excited in the fibre such that background noise is suppressed in the demodulated signals; and
a photodetector;
wherein the, or each, optical radiation transmitter is a single- or multi-transverse mode transmitter arranged to couple transmission signals into the multimode fibre which signals are combinations of modulated radio frequency signals and baseband signals. - View Dependent Claims (5, 6, 7, 15, 16)
- An optical communication system comprising;
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17. :
- A device for coupling combinations of modulated radio frequency signals and baseband signals into a multimode fibre using a launch which restricts the number of modes excited in the fibre such that background noise is suppressed in the demodulated signals, the device comprising at least one optical radiation transmitter having a single- or multi- transverse mode and drive circuitry having a first input port for modulated radio frequency signals and a second input port for baseband signals, the drive circuitry being arranged to receive electrical modulated radio frequency signals and baseband signals and to drive the laser transmitter therewith.
- View Dependent Claims (18, 19, 20)
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21. :
- An optical communication system using a multimode fibre wherein optical signals are coupled into the fibre for transmission using a technique which restricts the number of excited propagation modes within the fibre to enable high quality transmission of modulated radio frequency signals and baseband signals.
- View Dependent Claims (22, 23)
Specification