Cascaded fiber optic lattice filter

Details Cascaded fiber optic lattice filter Cascaded fiber optic lattice filter

G - Physics

02

B

88/97.4, 88/97.6

G02B 6/28 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1257120

CASCADED FIBER OPTIC LATTICE FILTER Abstract A fiber optic lattice filter having a transfer function wherein the poles and zeros are adjustable independently of each other. The filter comprises a cascaded configuration of recursive and non-recursive fiber optic lattice filters. In one preferred embodiment, an all-pass fiber optic filter is formed by cascading all- pole and all-zero lattice filters, and by processing the resulting filtered output signal in a subtractive detection system. This detection system produces a signal which represents the difference between two signal outputs provided by the all-zero filter section, and which is adjustable in magnitude, thereby providing an overall filtering function which is capable of handling both positive and negative valued input signals.

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