Reconfigurable multi-channel filters having enhanced channel bandwidth
First Claim
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1. A device comprising:
- a first bidirectional optical coupler having first and second arms;
a second bidirectional optical coupler having first and second arms;
an optical demultiplexer having an input and plural outputs;
a plurality of phase shifters;
an optical multiplexer having plural inputs and an output;
a first waveguide optically connecting the first arm of the first bidirectional coupler to the input of the optical demultiplexer, the first waveguide being coupled with a first all-pass optical filter;
the plurality of phase shifters being optically interposed between the plural outputs of the optical demultiplexer and the plural inputs of the optical multiplexer, and the output of the optical multiplexer connected to the first arm of the second bidirectional optical coupler;
a second waveguide optically connecting the second arms of the first and second bidirectional optical couplers, the second waveguide being coupled with an second all-pass optical filter.
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Abstract
In accordance with the invention, an MZI-based reconfigurable multi-channel filter is provided with enhanced channel bandwidth by adding an all-pass filter to one or both of the MZI arms. The result is a square-shaped amplitude response closely approximating the ideal.
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Citations
8 Claims
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1. A device comprising:
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a first bidirectional optical coupler having first and second arms;
a second bidirectional optical coupler having first and second arms;
an optical demultiplexer having an input and plural outputs;
a plurality of phase shifters;
an optical multiplexer having plural inputs and an output;
a first waveguide optically connecting the first arm of the first bidirectional coupler to the input of the optical demultiplexer, the first waveguide being coupled with a first all-pass optical filter;
the plurality of phase shifters being optically interposed between the plural outputs of the optical demultiplexer and the plural inputs of the optical multiplexer, and the output of the optical multiplexer connected to the first arm of the second bidirectional optical coupler;
a second waveguide optically connecting the second arms of the first and second bidirectional optical couplers, the second waveguide being coupled with an second all-pass optical filter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a folded Mach-Zehnder interferometer comprising a bidirectional coupler optically communicating with first and second waveguide arms;
said first waveguide arm optically interposed between said coupler and a first mirror;
a plurality of second mirrors, and a plurality of waveguides optically interposed between said second waveguide arm and said plurality of second mirrors;
a slab multiplexer optically interposed between said second waveguide arm and said plurality of waveguides;
a plurality of phase shifters in optical communication with said plurality of waveguides; and
an etalon all-pass optical filter interposed between said first waveguide arm and said first mirror.
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Specification