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US 5,473,719 AGranted
Optical dispersion compensator
AssigneeAT&T Corp.
InventorJulian Stone
Life of this patent
Estimating the term…
Abstract
Pulse broadening in a single mode optical transmission system due to wavelength dispersion is reduced by separating the different wavelength components and selectively delaying them. Upon recombination, the original phases of the wavelength components are restored, and the pulses narrowed. By using exclusively single mode devices, essentially lossless operation is realized.
Claims6
A dispersion compensator comprising:
- a single mode input demultiplexer;
- a single mode output multiplexer;
- and a plurality of different single mode delay lines connecting the output ports of said demultiplexer to the input ports of said multiplexer.
A dispersion compensator comprising:
- single mode input means for separating an input signal into its wavelength components;
- separate means for selectively delaying each of said wavelength components different lengths of time;
- and single mode output means for recombining said delayed components in a common wavepath.
A dispersion compensator comprising:
- an input star coupler having an input port and a plurality of output ports, and an output star coupler having a plurality of input ports and an output port;
- and a plurality of wavepaths connecting each output port of said input star coupler to an input port of said output star coupler;
- each wavepath including a wavelength filter tuned to a different bandpass and a section of delay line having a delay different from the delays associated with the other of said wavepaths.
Dependencies are inferred from the claim text.