Optical power detection apparatus and method
A technology of optical power detection and power, which is applied in the field of optical communication, can solve problems such as the inability to make good use of digital amplifiers, narrow detection range, and low voltage resolution, so as to facilitate debugging and fault location, improve sampling accuracy, and ensure reliability Effect
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[0038] Example 1
[0039] A high-precision optical power detection device, as shown in Figure 1, includes a photoelectric conversion unit (10), a logarithmic amplification unit (20), a subtraction unit (30), and a secondary amplification unit (40) connected in sequence, wherein The subtraction unit (30) is also connected to the control unit (60), the secondary amplifying unit (40) is connected to the AD (analog to digital) conversion unit (50), and the control unit (60) is connected to the AD conversion unit (50). The following is a detailed introduction to the functions of each unit.
[0040] The photoelectric conversion unit (10) is used for photoelectric conversion, and can adopt APD or PIN conversion circuit;
[0041] The logarithmic amplification unit (20) is used to logarithmically amplify the voltage output result of the photoelectric conversion;
[0042] The subtraction operation unit (30) performs subtraction operation on the voltage output result of the logarithmic ampli...
Example Embodiment
[0062] Example 2
[0063] The optical power detection device provided by this embodiment is shown in Figure 3. The device includes a photoelectric conversion unit (10), a logarithmic amplification unit (20), a secondary amplification unit (40), and an AD conversion unit (50) connected in sequence. ), a control unit (80) and a subtraction unit (70), wherein the photoelectric conversion unit (10) is also connected to the subtraction unit (70). The following is a detailed introduction to the functions of each unit.
[0064] The photoelectric conversion unit (10) is used for photoelectric conversion, and can adopt APD or PIN conversion circuit;
[0065] The logarithmic amplification unit (20) is used to logarithmically amplify the shunted circuit voltage;
[0066] The subtraction unit (70) can be realized by using a controllable current source to divide a part of the current from the PD circuit, and this part of the current can be converted into a voltage value. In this embodiment, th...
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