Loss-of-light detecting apparatus

Details Loss-of-light detecting apparatus Loss-of-light detecting apparatus

2008-02-25

2011-11-15

Singh, Dalzid (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S119000

Reexamination Certificate

active

08059959

ABSTRACT:
According to an aspect of an embodiment, an apparatus comprises: a correction level calculating unit that calculates a correction level, which is the input light level necessary to meet an optical signal-to-noise ratio at the maximum level of an optical noise signal; a loss-of-light detection threshold-value setting unit that compares the correction level with an initial threshold value to set a loss-of-light detection threshold value used in detection of any loss of light on the basis of the comparison result; and a loss-of-light detecting unit that compares the level of an input optical signal with the loss-of-light detection threshold value to determine that any loss of light is caused if the level of the input optical signal is lower than the loss-of-light detection threshold value.

REFERENCES:
patent: 2004/0161234 (2004-08-01), Ozawa
patent: 2006/0215545 (2006-09-01), Nelson
patent: 2007/0280684 (2007-12-01), Onoda et al.
patent: 11-317709 (1999-11-01), None
patent: 2004-247780 (2004-09-01), None

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