Optical receiver, active optical cable, and control method for optical receiver
First Claim
1. An optical receiver comprising:
- a photodetector element that converts an optical signal into an electric current signal;
a transimpedance amplifier that converts the electric current signal into a voltage signal;
a differential amplifier that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage;
a no-signal detection circuit that detects a no-signal section of the optical signal; and
a control section that repeatedly executes offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced,the control section skipping the threshold voltage change processing in the no-signal section.
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Accused Products
Abstract
The present disclosure includes a photodetector element (11) that converts an optical signal into an electric current signal; a transimpedance amplifier (12a) that converts the electric current signal into a voltage signal; a differential amplifier (12d) that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage; an LOS detection circuit that detects a no-signal section of the optical signal; and an MCU that repeatedly executes offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced, the MCU 13 skipping the threshold voltage change processing in the no-signal section.
12 Citations
10 Claims
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1. An optical receiver comprising:
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a photodetector element that converts an optical signal into an electric current signal; a transimpedance amplifier that converts the electric current signal into a voltage signal; a differential amplifier that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage; a no-signal detection circuit that detects a no-signal section of the optical signal; and a control section that repeatedly executes offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced, the control section skipping the threshold voltage change processing in the no-signal section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method for an optical receiver,
the optical receiver including: -
a photodetector element that converts an optical signal into an electric current signal; a transimpedance amplifier that converts the electric current signal into a voltage signal; and a differential amplifier that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage, the control method comprising the steps of; (i) detecting a no-signal section of the optical signal; and (ii) performing control by repeatedly executing offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced, the step (ii) skipping the threshold voltage change processing in the no-signal section of the optical signal.
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Specification