Distortion measurement in optical communication systems

Details Distortion measurement in optical communication systems Distortion measurement in optical communication systems

2001-10-09

2009-10-20

Phan, Hanh (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S025000, C398S026000, C398S033000, C398S177000, C398S154000, C398S155000, C398S202000, C398S208000, C375S224000, C375S317000, C375S341000, C714S704000, C714S705000

Reexamination Certificate

active

07606487

ABSTRACT:
The distortion component of an optical signal received from an optical transmission system, such as an all-optical system, subject to noise and amplitude distortion components, can be evaluated by a method that utilises information derived from analysing the bit error ratio (BER) of the signal as a function of a movable threshold. The analysis is performed in high and low bit error ratio areas of the eye diagram used for data one/zero decision making. The intersections with the threshold axis (where BER=0.25) of extrapolations of the high and low bit error ratio values provide variables V1and V2which are divided (V1/V2) to obtain an estimate/prediction of the amplitude closure of the eye diagram resulting from amplitude distortion. The analysis is preferably carried out after Q conversion of the BER values. The method can also be extended to provide indications of Q, bit error ratio and optical signal-to-noise ratio within the signal.

REFERENCES:
patent: 5325397 (1994-06-01), Scholz et al.
patent: 5585954 (1996-12-01), Taga et al.
patent: 5815294 (1998-09-01), Ishikawa et al.
patent: WO 00/18047 (2000-03-01), None
patent: WO 01/65733 (2001-09-01), None

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