Multiple pole optical filter

Details Multiple pole optical filter Multiple pole optical filter

1988-12-30

1990-02-13

Lee, John D.

350 9616, G02B 626

Patent

active

049001167

ABSTRACT:
A multiple pole optical bandpass filter comprises at least two input filter elements each having an input at one end and an output at the opposite end, and an output filter element having at least two inputs at one end coupled to the respective outputs of the input filter elements, and an output at the opposite end. Each of the filter elements comprises a segment of multimode optical fiber of predetermined length having mirrors at its opposite input and output ends. An intensity modulated light signal is provided at one of the input filter element inputs, while the same signal shifted by 180 degrees is provided at the other input filter element input.

REFERENCES:
patent: 3936142 (1976-02-01), Kersten
patent: 4325604 (1982-04-01), Witte
patent: 4360248 (1982-11-01), Bickel et al.
patent: 4383730 (1983-05-01), Witte
patent: 4553101 (1985-11-01), Mathis
patent: 4577924 (1986-03-01), Mathis
patent: 4695790 (1987-09-01), Mathis
patent: 4726644 (1988-02-01), Mathis

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