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AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd.
InventorsKenichi Ohhata, Ryoji Takeyari, Toru Masuda, Katsuyoshi Washio, Yasushi Hatta
Estimating the term…
An optical receiver generates a voltage signal having a predetermined swing from a current signal, and feeds the voltage signal to a decision circuit. An optical receiving element receives the input optical signal, converts the optical signal to a current signal, and provides the current signal to a preamplifier, which converts the input current signal into a voltage signal. The voltage signal is input to an amplifier having a limiting function, which linearly amplifies the voltage signal when the swing of the voltage signal is smaller than a predetermined value, and limitedly amplifies the voltage signal when the voltage signal is greater than the predetermined value. An automatic-gain-control amplifier receives the output from the amplifier with the limiting function, and amplifies the input voltage signal to a voltage signal having a constant swing. The decision circuit receives the output of the automatic-gain-control amplifier and decides the binary nature of the voltage, and thus of the input optical signal.
An optical receiver for converting an optical signal received into an electrical signal to output the electric signal, comprising:
Dependencies are inferred from the claim text.