Patent ID: 7333737
Filing Date: 2008-02-19
Classification: H04B

Abstract:
1. An optical receiver to which an optical code division multiplexed signal spread over time in accordance with a coding pattern on a transmission side is inputted, comprising: a decoding circuit for decoding the inputted optical signal in accordance with a decoding pattern that corresponds to the coding pattern; a time gate circuit for generating, based on a decoded optical signal outputted by the decoding circuit, a time gate signal that represents an interval of time in which a significant optical pulse is present in the decoded optical signal, and for passing or blocking the decoded optical so as to output a gated optical signal in response to the time gate signal, said time gate circuit including: a data regeneration circuit for regenerating data from the gated optical signal; timing adjustment means for matching the timing of the other split optical signal and at he time gate signal that are inputted to the gate means; and timing control means for obtaining an evaluation value of a timing relationship between the other split optical signal and the time gate signal on the basis of the gated optical signal, and for controlling the timing adjustment means in accordance with the evaluation value, wherein the evaluation value is a Q value when evaluating an optical signal in which the magnitude of the light intensity corresponds to data “0” or “1.”