Weighted-sum processing method and apparatus for decoding optica

Details Weighted-sum processing method and apparatus for decoding optica Weighted-sum processing method and apparatus for decoding optica

1996-08-22

1997-12-02

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 359189, 375333, 341 70, 371 6, H04B 1008, H04B 1006

Patent

active

056942311

ABSTRACT:
The method and associated apparatus of the present invention decodes optical signals by appropriately weighting the respective noise portions of the two phase segments generated by the photodetector, such as an APD, such that the optical signal can be reliably decoded. The photodetector detects an optical signal having a light portion and a dark portion. The photodetector then generates an electrical pulse in response to the optical signal. The electrical pulse has two phase segments, namely, one phase segment corresponding to the light portion of the optical signal and another phase segment corresponding to the dark portion of the optical signal. Each phase segment also includes a respective noise portion. The optical decoding method and apparatus determines a weighting factor based upon the respective noise portions of the two phase segments. Thereafter, at least one phase segment is weighted by the weighting factor. For example, the noisier phase segment can be attenuated by the weighting factor. A decoder can then identify the logic level of the optical signal based upon the two phase segments as weighted by the weighting factor.

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