Cascaded fiber optic lattice filter

Details Cascaded fiber optic lattice filter Cascaded fiber optic lattice filter

1984-06-20

1988-09-06

Lee, John

350 9616, G02B 626

Patent

active

047688505

ABSTRACT:
A fibre 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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