Back to results
US 7,257,291 B1Granted
Ultra-narrow bandpass filter
AssigneeLucent Technologies Inc.
InventorMahmoud Rasras
Life of this patent
Estimating the term…
Abstract
A passband filter exhibiting ultra-narrow characteristics comprising a cascaded pair of Mach-Zehnder (MZ) structures each including a plurality of resonators optically coupled to each of the arms of the MZ structures.
Claims8
An optical filter comprising:
- a first Mach-Zehnder optical structure including
- a pair of arms each one of which having an input port and an output port and an optical waveguide optically interconnecting the input port to the output port;
- a second Mach-Zehnder optical structure including
- a pair of arms each one of which having an input port and an output port and an optical waveguide optically interconnecting the input port to the output port;
- CHARACTERIZED IN THAT:
- one of the output ports of the first Mach-Zehnder structure is optically connected to an input port of the second Mach-Zehnder structure;
- each arm of both Mach-Zehnder optical structures includes one or more resonators optically coupled thereto;
- and
- upon application of an input optical signal to one of the input ports of the first Mach-Zehnder structure, a THROUGH output signal is available at one of the output ports of the second Mach-Zehnder structure and a DROP output signal is available at the other output port of the second Mach-Zehnder structure.
6 more elements
Dependencies are inferred from the claim text.