H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) H04B 10/145 (2006.01) H04B 10/148 (2006.01) H04B 10/155 (2006.01) H04B 10/158 (2006.01)
Patent
CA 2412111
An apparatus for detecting cutoff of an optical signal includes an optical power monitoring circuit for producing an output voltage corresponding to power of an input optical signal, a threshold voltage setting circuit for setting a threshold voltage Vth corresponding to the power of the input optical signal so that the threshold voltage Vth is lower than the output voltage produced by the optical power monitoring circuit during receiving the optical signal, the threshold voltage setting circuit having a time constant larger than that of the optical power monitoring circuit, and a comparing circuit for comparing the output voltage produced by the optical power monitoring circuit with the threshold voltage Vth set by the threshold voltage setting circuit and for outputting an optical cutoff alarm signal indicating a cutoff of the optical signal according to a comparison result.
Kirby Eades Gale Baker
Mitsubishi Denki Kabushiki Kaisha
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