Fiber optic transversal filter/variable delay line

Details Fiber optic transversal filter/variable delay line Fiber optic transversal filter/variable delay line

1989-09-13

1990-12-11

Ullah, Akm

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9615, 455610, G02B 626, G02B 642, G02F 100, G02F 200

Patent

active

049765183

ABSTRACT:
An optical transversal filter comprises a plurality of optically power spting devices, e.g., 3.times.3 single mode optical couplers, interspersed with fiber optical delay segments. In a n-column system the number of optical couplers in each column is given by the progression, 1,3,9 . . . 3.sup.(n-1) and only two different lengths of the fiberoptic delay segments are required. Fiber optic delay segments of the appropriate delays are connected to the three outputs of each of the composite such that the fiber optic delay segments connected to the last column provide 3.sup.n taps. The outputs can be combined in a single fiber and multiple inputs can be used. Variable weight output taps are provided by connecting each output to an optical intensity modulator or switch.

REFERENCES:
patent: 4890893 (1990-01-01), Smoot
patent: 4900115 (1990-02-01), Heuring et al.
patent: 4934777 (1990-06-01), Joue et al.

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