Multimode Fibre Optical Communication System
First Claim
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1. 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; and
a photodetector;
characterised by the feature that the, or each, optical radiation transmitter is a multiple transverse mode laser transmitter and that the transmission signals used are radio frequency signals.An optical communications link according to claim 1 where other optical or optoelectronic components, such as modulators and amplifiers, are included in the link.An optical communication system according to claims 1 or 2 where the means of coupling light into the fibre produces a launch which is restricted within the fibre such that the relative power in both high and low order modes is limited with respect to intermediate order modes.An optical communication system according to claim 3 where the fibre has a core diameter of 62.5 μ
m and where the multiple mode transmitter provides a launch characterised by greater than 75% of the encircled flux being within a circle of radius 25 μ
m with a centre at the centre of the multimode fibre core.An optical communication system where the multiple mode output of the source is modified to provide high quality radio over fibre transmission but with relaxed alignment tolerances.An optical communication system according to claim 3 where the necessary fibre modes are excited using some equivalent launch technique to the above, such as an angled launch.An optical communication system, according to the above claims whereby high frequencies, beyond the fibre bandwidth, are required for successful information transmission. Such systems include those using advanced multistate coding and decoding, or those involving equalisation.An optical communication system as substantially described with reference to and as illustrated in any appropriate combination of the accompanying text and drawings.
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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 with a specified restricted launch to allow multiple trans-verse mode lasers transmitters to be used in low cost radio over fibre links. The launch technique allows a reduction in modal dispersion and modal interference, thus greatly improving the transmission performance of radio over fibre signals over multimode fibre as well as reducing system impairments such as outages and link failures.
117 Citations
1 Claim
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1. An optical communication system comprising:
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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; and a photodetector; characterised by the feature that the, or each, optical radiation transmitter is a multiple transverse mode laser transmitter and that the transmission signals used are radio frequency signals. An optical communications link according to claim 1 where other optical or optoelectronic components, such as modulators and amplifiers, are included in the link. An optical communication system according to claims 1 or 2 where the means of coupling light into the fibre produces a launch which is restricted within the fibre such that the relative power in both high and low order modes is limited with respect to intermediate order modes. An optical communication system according to claim 3 where the fibre has a core diameter of 62.5 μ
m and where the multiple mode transmitter provides a launch characterised by greater than 75% of the encircled flux being within a circle of radius 25 μ
m with a centre at the centre of the multimode fibre core.An optical communication system where the multiple mode output of the source is modified to provide high quality radio over fibre transmission but with relaxed alignment tolerances. An optical communication system according to claim 3 where the necessary fibre modes are excited using some equivalent launch technique to the above, such as an angled launch. An optical communication system, according to the above claims whereby high frequencies, beyond the fibre bandwidth, are required for successful information transmission. Such systems include those using advanced multistate coding and decoding, or those involving equalisation. An optical communication system as substantially described with reference to and as illustrated in any appropriate combination of the accompanying text and drawings.
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Specification
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Current AssigneeZinwave Limited
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Original AssigneeZinwave Limited
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InventorsWhite, Ian Hugh, Penty, Richard Vincent, Hartmann, Peter, Seeds, Alwyn John
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Application NumberUS11/660,625Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current398/115CPC Class CodesH04B 10/25752 Optical arrangements for wi...
