Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2011-08-30
2011-08-30
Vanderpuye, Ken N (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S025000, C380S256000, C359S337220
Reexamination Certificate
active
08009984
ABSTRACT:
A method and apparatus for measuring the optical power of very weak light arriving at a receiver, by using a photon detector, are provided. A photon detector detects the presence or absence of the arrival of a photon in accordance with bias application timing. For a train of optical pulses coming in at an arbitrary timing in respective time slots, the bias application timing is sequentially shifted within the range of a time slot. Each time a shift is made, the number of photons detected is counted by a photon counter. Based on this number of photons, the optical power of the train of the optical pulses is measured.
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Maeda Wakako
Tajima Akio
Takahashi Seigo
Tanaka Akihiro
Foley & Lardner LLP
Jacob Oommen
NEC Corporation
Vanderpuye Ken N
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