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US 6,147,785 AGranted
Coherent crosstalk attenuation apparatus
AssigneeCiena Corporation
InventorVictor Mizrahi
Life of this patent
Estimating the term…
Abstract
A optical device is provided for reducing coherent crosstalk associated with a particular channel within a communications network. An attenuator is coupled between an emitter associated with a first node and a receiving element associated with a second node. The attenuator adjusts the signal power level generated by the emitter such that the signal power is within the dynamic range of the receiving element.
Claims11
An optical device comprising:
- a first transfer element coupled along an optical path, said optical path carrying a plurality of information bearing channels, each at a respective wavelength, said first transfer element being configured to add an optical channel to said plurality of information bearing channels having an associated signal power;
- a second transfer element coupled to said first transfer element along said optical path, said second transfer element configured to select said optical channel from said plurality of information bearing channels;
- and
- an attenuator coupled to said first transfer element, said attenuator being configured to adjust the power associated with said optical channel received by said second transfer element such that coherent crosstalk levels associated with said optical channel is reduced by approximately 15 dB or greater.
1 more element
An optical device comprising:
- an emitter for transmitting an optical signal at an associated power level;
- a first add/drop multiplexer coupled to said emitter along a closed optical path, said first add/drop multiplexer adding said optical signal to a first set of a plurality of optical signals;
- a second add/drop multiplexer coupled to said first add/drop multiplexer along said closed optical path, said second add/drop multiplexer selecting said optical signal from said first set of a plurality of optical signals;
- a receiving element having a corresponding dynamic range, said receiving element coupled to said second add/drop multiplexer and configured to receive said optical channel;
- and
- an attenuator coupled to said emitter for adjusting said power level associated with said optical channel to be within said dynamic range of said receiving element such that coherent crosstalk levels associated with said optical channel is reduced by approximately 15 dB or greater.
3 more elements
A method for reducing crosstalk associated with an optical channel within a communications network comprising the steps of:
- generating an optical channel having a total power level;
- selecting said optical channel from a plurality of optical channels carried along an optical path;
- transmitting a first portion of said optical channel along said optical path, said first portion of said optical channel having an associated first power level;
- transmitting a second portion of said optical channel to a receiving element, said second portion of said optical channel having an associated second power level;
- and
- adjusting said total power level associated with said optical channel such that said first power level is reduced and said second power level is sufficient for recognition by said receiving element, and coherent crosstalk levels associated with said optical channel is reduced by approximately 15 dB or greater.
3 more elements
Dependencies are inferred from the claim text.