Automatic gain control system for optical communication reception system
专利汇可以提供Automatic gain control system for optical communication reception system专利检索，专利查询，专利分析的服务。并且PURPOSE:To always ensure the setting to nearly the optimum identification level by giving the average value detection to the output of the DC reproduction circuit in the optical communication reception system and then giving the automatic gain control. CONSTITUTION:The optical communication reception system consists of APD (Avalanche Photo Diode) 1, preamplifier 2, variable gain amplifier 3, equalizer 4, DC reproduction circuit 5 and identifier 6 each. The automatic gain is carried out by giving the DC level exchange to comparator 12 functioning as a differential amplifier as well as to output 13 of comparator 12 through DC/DC converter 14 to vary the overlap voltage of APD1 and then the amplification factor, or by applying output 13 to variable gain amplifier 13. The reference voltage of comparator 12 uses the output obtained by making pass output 8 of identifier 6 through low band pass filter 17, and the input of the other side of comparator 12 uses the output obtained by making pass output 7 of circuit 5 through low band pass filter 16. As a result, the reference voltage changes in proportion to the mark rate although the mark rate may change, thus ensuring the optimum identification level at all times irrespective of the change of the mark rate.，下面是Automatic gain control system for optical communication reception system专利的具体信息内容。
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