| 摘要 |
To obtain a dispersion compensation type optical signal receiving apparatus constituted in such a manner that an electric signal outputted from a light receiving module can be properly inputted to an electronic dispersion compensation IC without being distorted, even when the input level of the optical signal is high. The dispersion compensation type optical signal receiving apparatus comprises: an APD element for converting input signal light inputted from a transmission line into an electric signal; an amplifying device constituted with a preamplifier circuit and a limit amplifier circuit, which amplifies the electric signal converted by the APD element; an EDC IC for compensating the dispersion in the transmission line electrically; and a clock/data reproducing circuit for reproducing the clock and data signal contained in the input signal light, wherein there is provided a VOA for limiting the amplitude of the input signal light inputted to the APD element and an attenuation amount controlling circuit for controlling the attenuation amount of the VOA in accordance with the bias current of the APD element.
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