Apparatus for optical communications
First Claim
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1. A spectral equaliser for an optical communication system comprising a number of optical inputs, a number of optical outputs, and a reconfigurable holographic filter arranged in an optical path between the optical inputs and the optical outputs, characterised in that the reconfigurable holographic filter is configurable to provide signal power equalisation for a number of optical signals or signal channels of predetermined different wavelengths.
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Abstract
A holographic filter for an optical communication system is configurable to provide signal power equalisation for a number of optical signals or signal channels in a wavelength division multiplexed system.
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Citations
14 Claims
- 1. A spectral equaliser for an optical communication system comprising a number of optical inputs, a number of optical outputs, and a reconfigurable holographic filter arranged in an optical path between the optical inputs and the optical outputs, characterised in that the reconfigurable holographic filter is configurable to provide signal power equalisation for a number of optical signals or signal channels of predetermined different wavelengths.
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14. A reconfigurable holographic filter in combination with processing means storing data on a number of predetermined holograms for configuring the holographic filter, at least one of said holograms being arranged to provide signal power equalisation for a number of optical signals or signal channels of predetermined different wavelengths.
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