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US 10,897,311 B2Granted
Optical signal modulation circuit and apparatus
AssigneeHuawei Technologies Co., Ltd.
InventorsLiqiang Yu, Liming Fang, Sulin Yang, Xiaofeng Zhang
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AssigneeHuawei Technologies Co., Ltd.
InventorsLiqiang Yu, Liming Fang, Sulin Yang, Xiaofeng Zhang
Estimating the term…
An optical signal modulation circuit includes a laser (DFB), a modulator (EAM), and an operational amplifier. The laser (DFB) generates a laser to stimulate the modulator (EAM) to generate a photon-generated current (ip), a first port (a) of the modulator (EAM) is connected to a first input voltage (Vbias), a second port (b) of the modulator (EAM) is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage (Vin), and an output end of the operational amplifier is connected to the first port (a) of the modulator. In the modulation circuit, a photon-generated current (ip) of the EAM is fed back to the operational amplifier, to implement a linear relationship between the second input voltage (Vin) and the photon-generated current (ip) of the EAM, and obtain a linear EML transmission curve, namely, a high-linearity EML.
An optical signal modulation circuit, comprising a laser source, a modulator, and an operational amplifier, wherein the laser source generates a laser to stimulate the modulator to generate a photon-generated current, a first port of the modulator is connected to a first input voltage, a second port of the modulator is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage, and an output end of the operational amplifier is connected to the first port of the modulator, wherein the modulator is an electro-absorption modulator, a P-electrode of the electro-absorption modulator is connected to the first input voltage, an N-electrode of the electro-absorption modulator is connected to the inverting input end of the operational amplifier, and the output end of the operational amplifier is connected to the P-electrode of the electro-absorption modulator.
An optical transmitter component, comprising an optical signal modulation circuit, wherein the optical signal modulation circuit comprises a laser source, a modulator, and an operational amplifier, wherein the laser source generates a laser to stimulate the modulator to generate a photon-generated current, a first port of the modulator is connected to a first input voltage, a second port of the modulator is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage, and an output end of the operational amplifier is connected to the first port of the modulator, wherein the modulator is an electro-absorption modulator, a P-electrode of the electro-absorption modulator is connected to the first input voltage, an N-electrode of the electro-absorption modulator is connected to the inverting input end of the operational amplifier, and the output end of the operational amplifier is connected to the P-electrode of the electro-absorption modulator.
An optical line terminal, comprising an optical transmitter component, wherein the optical transmitter component comprises an optical signal modulation circuit, wherein the optical signal modulation circuit comprises a laser source, a modulator, and an operational amplifier, wherein the laser source generates a laser to stimulate the modulator to generate a photon-generated current, a first port of the modulator is connected to a first input voltage, a second port of the modulator is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage, and an output end of the operational amplifier is connected to the first port of the modulator, wherein the modulator is an electro-absorption modulator, a P-electrode of the electro-absorption modulator is connected to the first input voltage, an N-electrode of the electro-absorption modulator is connected to the inverting input end of the operational amplifier, and the output end of the operational amplifier is connected to the P-electrode of the electro-absorption modulator.
Dependencies are inferred from the claim text.