Optical signal processing apparatus
First Claim
1. An optical signal processing apparatus comprising:
- an optical signal introducing portion for introducing an optical signal to be processed;
a light-receiving circuit for converting the optical signal to be processed which is introduced from said optical signal introducing portion, into a main signal for measuring an error rate, and an auxiliary signal for measuring optical power, and outputting the main signal and the auxiliary signal;
optical power measuring means for measuring optical power of the optical signal to be processed on the basis of the auxiliary signal for measuring optical power which is output from said light-receiving circuit;
error rate measuring means for measuring an error rate of the optical signal to be processed on the basis of the main signal for measuring an error rate which is output from said light-receiving circuit, and a clock signal included in the main signal; and
data analyzing means for performing, on the basis of optical power measurement data from said optical power measuring means and error rate measurement data from said error rate measuring means, a correlation analysis of the two data.
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Accused Products
Abstract
A light-receiving circuit converts an optical signal to be processed which is introduced from an optical signal introducing portion, into first and second electrical signals corresponding to the optical signal, and outputs them. The light-receiving circuit includes first and second negative-feedback differential DC amplifying circuits, a photodiode, and a bias power supply circuit. Each of the DC amplifying circuits outputs a voltage proportional to a current flowing through the inverting input terminal from the output terminal. The photodiode has an anode, a cathode, and a light input portion. The anode is directly connected in a DC manner to the inverting input terminal of one of the DC amplifying circuits, and the cathode is directly connected in a DC manner to the inverting input terminal of the other DC amplifying circuit. The photodiode flows from the cathode to the anode a light reception current corresponding to the optical signal to be processed which is input to the light input portion. The bias power supply circuit applies a bias voltage to the non-inverting input terminal of at least one of the first and second DC amplifying circuits so as to set the potential of the cathode of the photodiode higher than that of the anode.
16 Citations
21 Claims
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1. An optical signal processing apparatus comprising:
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an optical signal introducing portion for introducing an optical signal to be processed; a light-receiving circuit for converting the optical signal to be processed which is introduced from said optical signal introducing portion, into a main signal for measuring an error rate, and an auxiliary signal for measuring optical power, and outputting the main signal and the auxiliary signal; optical power measuring means for measuring optical power of the optical signal to be processed on the basis of the auxiliary signal for measuring optical power which is output from said light-receiving circuit; error rate measuring means for measuring an error rate of the optical signal to be processed on the basis of the main signal for measuring an error rate which is output from said light-receiving circuit, and a clock signal included in the main signal; and data analyzing means for performing, on the basis of optical power measurement data from said optical power measuring means and error rate measurement data from said error rate measuring means, a correlation analysis of the two data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification