Coherent equalization of optical signals
First Claim
1. A coherent optical equalizer for an input optical signal, the input optical signal including a wanted optical signal and an unwanted optical signal temporally delayed relative to the wanted optical signal, the equalizer comprising:
- a beamsplitter configured to split a first optical signal including at least the wanted optical signal into first beams including a first beam subject to delay;
a delay component arranged to receive at least the first beam subject to delay from the beamsplitter and configured to delay the first beam subject to delay to provide a delayed first beam; and
a coherent summing component located to receive beams including the delayed first beam, at least one of the beams including the wanted optical signal, the coherent summing component structured to coherently sum the beams to generate a second optical signal in which the unwanted optical signal has a reduced intensity compared with in the input optical signal.
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Abstract
Coherent optical equalization is applied in the optical domain to an input optical signal that includes a wanted optical signal and an unwanted optical signal temporally delayed relative to the wanted optical signal. A first optical signal that includes at least the wanted optical signal is split into first beams that include a first beam subject to delay. The first beam subject to delay is delayed to provide a delayed first beam. Beams that include the delayed first beam are coherently summed to produce a second optical signal in which the unwanted optical signal has a reduced intensity compared with in the input optical signal. In the coherent summing, the instance of the wanted optical signal in the delayed first beam cancels the unwanted optical signal in another of the beams that are coherently summed.
18 Citations
33 Claims
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1. A coherent optical equalizer for an input optical signal, the input optical signal including a wanted optical signal and an unwanted optical signal temporally delayed relative to the wanted optical signal, the equalizer comprising:
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a beamsplitter configured to split a first optical signal including at least the wanted optical signal into first beams including a first beam subject to delay;
a delay component arranged to receive at least the first beam subject to delay from the beamsplitter and configured to delay the first beam subject to delay to provide a delayed first beam; and
a coherent summing component located to receive beams including the delayed first beam, at least one of the beams including the wanted optical signal, the coherent summing component structured to coherently sum the beams to generate a second optical signal in which the unwanted optical signal has a reduced intensity compared with in the input optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for performing coherent equalization of an input optical signal, the input optical signal including a wanted optical signal and an unwanted optical signal temporally delayed relative to the wanted optical signal, the method comprising:
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splitting a first optical signal including at least the wanted optical signal into first beams, the first beams including a first beam subject to delay;
delaying the first beam subject to delay to provide a delayed first beam; and
coherently summing beams including the delayed first beam to generate a second optical signal in which the unwanted optical signal has a reduced intensity compared with in the input optical signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification