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AssigneeTemplex Technology, Inc.
InventorsThomas Mossberg, Anders Grunnet-Jepsen, John N. Sweetser, Michael Munroe
Estimating the term…
Methods and apparatus for optical communication are disclosed. An optical data stream is encoded to produce an optical data stream having a predetermined time-wavelength spectrum. Two or more encoded data streams are combined in a transmission medium (e.g., optical fiber) and the combined data stream is decoded with decoders corresponding to the encoding of the data streams, producing decoded outputs. The decoded outputs include a portion corresponding to a selected data stream as well as a portion corresponding to unselected data streams (crosstalk). A nonlinear detector receives the decoded outputs and rejects crosstalk. Coders produce temporal delays and phase shifts specified by a time-wavelength code for, the spectral components of an input optical signal. Some coders convert optical signals encoded with a first time-wavelength code into an output corresponding to a second time-wavelength code. Temporal delays and phase shifts can be selected to compensate for dispersion in a transmission medium. Coherent coders are provided in which the phase shifts produced on the spectral components of an optical signal are controlled within about one half of the wavelength of the spectral component.
A time-wavelength coder for coding an optical signal having a plurality of spectral components, comprising:
A time-wavelength coder for coding an optical signal having a plurality of spectral components, comprising:
A code converter for converting an input optical signal having a time-wavelength spectrum determined by an input time-wavelength code into a coded output having a time-wavelength spectrum determined by an output code, the code converter comprising:
A time-wavelength coder that receives an input optical signal having a first predetermined time-wavelength spectrum and generates an output signal having a second predetermined time-wavelength spectrum, each of the first and second predetermined time-wavelength spectra including a plurality of spectral components, the coder comprising an optical fiber that includes a plurality of fiber Bragg gratings defined by spatial variations of an optical property of the fiber, the spatial variations providing predetermined time-delays for the spectral components, wherein the spatial variations provide predetermined phase differences for the spectral components and the predetermined phase differences are predetermined to within about one-half of a wavelength of the associated spectral component.
Dependencies are inferred from the claim text.