Optical communications – Diagnostic testing – Fault location
Reexamination Certificate
2001-11-27
2010-06-01
Curs, Nathan M (Department: 2613)
Optical communications
Diagnostic testing
Fault location
C398S004000, C398S006000, C398S007000, C398S030000
Reexamination Certificate
active
07729613
ABSTRACT:
The invention provides an optical shutter (400) for a communication system of a type comprising first (B1, B2) and second (A1, A2) communication paths along which information-bearing radiation propagates in opposite directions. The shutter (400) comprises: an optical tap (440) and a power monitor (430) for monitoring power of information-bearing radiation propagating along the first path (B1, B2) and for generating a corresponding radiation power indicative signal; a control unit (420) for comparing the indicative signal with a threshold value to generate a control signal (control); and shutter switch (410) for selectively substantially transmitting or blocking radiation propagating along the second path (A1, A2) in response to the control signal.
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Curs Nathan M
Ericsson AB
Kirschstein, et al
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