Patent ID: 8824903

Claim:
A method of determining a signal property of a first binary signal in a circuit for an optical transmitter, receiver or transceiver comprising: a. providing a first binary signal, having a logic-low level and a logic-high level, said binary signal modulated by a signal content, b. providing a reference binary signal by modulating a reference stage, having a reference logic-low level and a reference logic-high level, said reference signal modulated by said signal content by i. modulating said reference stage with said first binary signal or substantially a copy thereof, or ii. providing a second binary signal being a substantially limited copy of said first signal and applying said second binary signal in modulating said reference stage, c. providing at least one first-peak-measure of one of said logic levels of said first binary signal, d. providing at least one reference-peak-measure of the corresponding logic levels of said reference binary signal, and e. comparing said first-peak-measure and said reference-peak-measure to obtain a measure of said signal property, said signal property being the modulation amplitude of said first binary signal.