McGinn IP Law Group, PLLC.
Optical signal processing device and optical signal processing method
An optical hybrid (100) generates a first optical signal by causing local light to interfere with a received optical signal which is received from an outside with a first phase difference. In addition, the optical hybrid (100) generates a second optical signal by causing the local light to interfere with the received optical signal with a second phase difference shifted by π from the first phase difference. Two photoelectric conversion elements (150) photoelectrically convert the first optical signal and the second optical signal, respectively, and generate a first electrical signal and a second electrical signal. A differential trans-impedance amplifier (200) includes a direct-current component correction unit (210), a trans-impedance circuit (240), and a variable gain amplifier (250). The direct-current component correction unit (210) reduces a difference of the magnitude of a direct-current component of the first electrical signal and the magnitude of a direct-current component of the second electrical signal.
NEC CORPORATION
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Yasuyuki
Suzuki