Telecommunications system
First Claim
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1. A method of communicating between a first node and one or more further nodes in an optical communications system, the method comprising:
- i) receiving at the first node, an optical signal transmitted from a first further node over an optical fibre link;
ii) detecting, at the first node, the optical signal using an electro-absorption modulator and producing thereby an electrical signal representing information carried by the optical signal; and
iii) imposing, using said electro-absorption modulator, an information-carrying modulation onto the received optical signal and feeding the thus modulated optical signal into an optical fibre link to transmit it to a second further node;
wherein step ii and step iii are carried out with the electro-absorption modulator subject to the same DC operating conditions.
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Abstract
An optical communications network includes a terminal which can simultaneously receive and modulate an optical signal. The terminal includes an optical modulator which is controlled by varying the bias voltage applied to it.
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Citations
15 Claims
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1. A method of communicating between a first node and one or more further nodes in an optical communications system, the method comprising:
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i) receiving at the first node, an optical signal transmitted from a first further node over an optical fibre link;
ii) detecting, at the first node, the optical signal using an electro-absorption modulator and producing thereby an electrical signal representing information carried by the optical signal; and
iii) imposing, using said electro-absorption modulator, an information-carrying modulation onto the received optical signal and feeding the thus modulated optical signal into an optical fibre link to transmit it to a second further node;
wherein step ii and step iii are carried out with the electro-absorption modulator subject to the same DC operating conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical communications network includes a remote terminal characterised in that said terminal comprises an electro-absorption modulator that
i) detects an incoming optical signal from a first portion of the optical communications network whilst simultaneously ii) modulating said incoming optical signal, said optical signal being transmitted to a further portion of the optical communications network.
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13. A bi-directional optical-electrical signal transducer comprising:
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an electro-absorption modulator having optical signal input and output ports and an electrical signal input/output port, whereby;
first information-bearing optical signals presented to said optical signal input port produce corresponding first information-bearing electrical signals at said electrical signal input/output port, and second information-bearing electrical signals presented to said electrical signal input/output port produce corresponding second information bearing optical signals modulated onto an optical signal at said optical signal output port. - View Dependent Claims (14, 15)
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Specification