Optical waveguiding component comprising a band-pass filter
AssigneeAT&T Corp.
InventorVictor Mizrahi
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Abstract
An optical filter is adapted for selectively transmitting electromagnetic radiation within a wavelength passband bounded by a pair of stop bands of relatively low transmissivity. The filter includes at least one Bragg grating formed in a waveguiding optical medium. The Bragg grating has at least one wavelength band of relatively low transmissivity. This low-transmissivity band corresponds to at least a portion of one of the stop bands of the filter.
Claims11
An optical demultiplexer comprising an input waveguide, at least two output waveguides, means for splitting optical transmissions from the input waveguide into the output waveguides, and wavelength-selective means for selectively transmitting electromagnetic radiation within a respective, distinct wavelength passband in each of the output waveguides, wherein:
- a) the wavelength-selective means comprise a respective optical filter included in each of the output waveguides, such that wavelength selection takes place after the splitting of the optical transmissions by said splitting means;
- b) each of said filters is adapted for selectively transmitting electromagnetic radiation within a passband of wavelengths and at least partially excluding electromagnetic radiation in first and second stop bands of wavelengths adjacent and respectively above and below the passband;
- c) each of said filters comprises a set of one or more Bragg gratings;
- d) each of said Bragg gratings has at least one wavelength band of relatively low transmissivity;
- and
- e) each of said low-transmissivity bands coincides with at least a portion of one of the stop bands of the corresponding filter.
Dependencies are inferred from the claim text.