Wide-range optical power meter

Abstract

The invention relates to a wide-range optical power meter, which includes a photoelectric detector, a photoelectric signal amplification and analog-to-digital conversion sampling circuit, and a control calculation unit. The output terminal of the photoelectric detector is connected to the input of the photoelectric signal amplification and analog-to-digital conversion sampling circuit. The output end of the photoelectric signal amplification and analog-to-digital conversion sampling circuit is connected with the input end of the control calculation unit, and the input end of the photodetector is connected with an adjustable optical attenuator for adjusting the measurement range; The control calculation unit is also connected to the adjustable optical attenuator through an attenuation control circuit. The invention only needs to use one photodetector and a set of optical signal amplification and sampling circuits to complete the purpose of wide-range optical power signal testing, and the optical path is simple.

Description

technical field [0001] The invention relates to the technical field of optical power measurement, in particular to a wide range optical power meter. Background technique [0002] In the field of communication testing, an optical power meter is a widely used device, through which a technician or a management system can obtain the optical power value of a laser or an optical fiber. However, the measurement range of the optical power meter is limited by the measurement response range of the photodetector. Photodetectors that can test low power (such as -70dBm to -50dBm) often cannot accurately measure high power (such as 0dBm to 20dBm) optical signals, and vice versa The same is true. At present, the measurement dynamic range of a single photodetector is generally within 90dB. Figure 4 It is a typical photoelectric structure diagram of the current optical power test. The test dynamic range of the optical power meter adopting this design is consistent with the measurement dyna...

AI Technical Summary

Problems solved by technology

In order to solve the problem of wide range measurement (>90dB), the traditional solution in the industry is to use multiple photoelectric probes with different measurement power ranges in a single device to expand the range, such as Thorlabs' wide range optical power meter, its structure Figure 5 As shown, each time a measurement is made, a suitable probe is selected according to the power range of the light to be measured. This solution undoubtedly requires more probes. Each probe has a photodetector and corresponding circuits and structural parts, and the cost is relatively low. High, and each probe must be calibrated

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