| 摘要 |
A bit rate control apparatus and method for an optical receiver capable of avoiding an erroneous determination of the bit rate occurring under the influence of temperature. The bit rate control apparatus includes: a delay unit for delaying an input signal received in the optical receiver in an optoelectrically-converted state; a DC level outputting unit for exclusively OR'ing the input signal with the delayed signal outputted from the delay unit, and for outputting a signal obtained after the exclusive ORing in the form of a DC level; an A/D converting unit for A/D converting for the DC level outputted from the DC level outputting unit; a clock/data reproducing unit for receiving the input signal and reproducing clocks and data based on a bit rate control signal, and a control unit for calculating a variation in the DC level at every interrupt timing, which is previously set, based on the A/D converted signal, for determining whether the DC level variation occurs under the influence of temperature or due to a variation in bit rate based on a difference between the calculated DC level variation from a predetermined variation limit, and for outputting a bit rate control signal based on the determination outcome.
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