Patent ID: 7130543
Filing Date: 2006-10-31
Classification: H04B

Abstract:
1. A bit rate-independent optical receiver, comprising: an opto-electric converter configured to convert an input optical signal into an electric signal; an amplifier circuit configured to amplify the electrical signal; a bit rate-sensing circuit connected to receive the amplified electrical signal and configured to generate a sensing signal with a voltage level determined on the basis of a bit rate of the electrical signal; a bit rate-recognition circuit configured to generate a recognition signal that is further amplified from the sensing signal, said bit rate-recognition circuit having a structure of providing an extended range of recognizable total input voltages by connecting a plurality of logarithm amplifiers in series, each of which logarithm amplifiers has a predetermined range of recognizable input voltage; a clock/data recovery circuit configured to reproduce a clock signal and data from the amplified electrical signal in accordance with a control signal and outputting the reproduced clock signal and data; and, a controller configured to determine a bit rate corresponding to a voltage level of the recognition signal by referring to a look-up table defining a predetermined relationship of the bit rate to the voltage level, and for providing the clock/data recovery circuit with the control signal representative of the bit rate.