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US 5,488,680 AGranted
Frequency routing device having a wide and substantially flat passband
AssigneeAT&T Corp.
InventorCorrado Dragone
Life of this patent
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Abstract
An optical apparatus is provided that includes a first frequency routing device having at least one input port and P output ports, where P>2. A second frequency routing device is also provided that has P input ports and at least one output port. P optical paths couple the input port of the first frequency routing device to the output port of the second frequency routing device.
Claims15
An optical apparatus comprising:
- a first frequency routing device having at least one input port and P output ports, where P>2;
- a second frequency routing device having at least P input ports and at least one output port;
- P optical paths coupling the output port of the first frequency routing device to the input port of the second frequency routing device;
- and
- wherein the optical paths each have a transmission coefficient substantially equal to unity at a distinct optical wavelength, each of said transmission coefficients being substantially equal to one half unity at an intermediate wavelength approximately halfway between adjacent ones of said distinct optical wavelengths.
2 more elements
An optical apparatus comprising:
- a first frequency routing device having at least one input port and P output ports, where P>2;
- a second frequency routing device having at least P input ports and at least one output port;
- P optical paths coupling the output of the first frequency routing device to the input port of the second frequency routing device;
- and
- wherein the optical paths each have a transmission coefficient equal to a maximum value at a distinct optical wavelength, and each pair of adjacent optical paths produces a transmission coefficient having a minimum value at an intermediate wavelength approximately halfway between adjacent ones of said distinct optical wavelengths.
2 more elements
An optical apparatus comprising:
- a first frequency routing device having at least one input port and a plurality of output ports;
- a second frequency routing device having a plurality of input ports and at least one output port;
- a plurality of waveguides each coupling one of the output ports of the first frequency routing device to one of the input ports of the second frequency routing device;
- wherein the output ports of the first frequency routing device are coupled to the input ports of the second frequency routing device in a consecutive order;
- wherein the first frequency routing device is a Mach-Zehnder apparatus;
- wherein said Mach-Zehnder apparatus comprises a Y-branch coupler serving as said input port and first and second output waveguides coupled to said Y-branch coupler, said first and second output waveguides terminating in an output section such that a predetermined portion of an optical signal propagating in each of the first output waveguides is transferred to the other one of the first and second output waveguides;
- and
- wherein said predetermined portions of the optical signals transferred between the first and second output waveguides of the Mach-Zehnder apparatus are substantially equal to half the power of each optical signal.
5 more elements
Dependencies are inferred from the claim text.