DDMI (digital diagnostic monitoring interface) optical module transmitter circuit and optical power monitoring method for same

Abstract

The invention discloses a DDMI (digital diagnostic monitoring interface) optical module transmitter circuit and an optical power monitoring method for the same. The DDMI optical module transmitter circuit comprises a laser driving circuit, a microprocessor, a laser and a photosensitive diode, wherein the microprocessor drives the laser to emit lasers by the laser driving circuit; the photosensitive diode senses the lasers emitted by the laser, and converts the lasers into an electrical signal; and the microprocessor obtains optical power by the electrical signal of the photosensitive diode. The DDMI optical module transmitter circuit disclosed by the invention realizes monitoring accuracy compensation within an industrial temperature range by an algorithm and a microprocessing system, can be used for ensuring the accuracy of an optical module within a commercial total-temperature range and an industrial total-temperature range, can achieve the monitoring accuracy of + / -1dB and is simple and easy to realize. By the DDMI optical module transmitter circuit and the optical monitoring method for the same, optical power monitoring over the transmitter circuit within a wide range of -6dBm to -10dBm can be met.

Description

technical field [0001] The invention relates to a photoelectric communication technology, in particular to a DDMI optical module sending circuit and an optical power monitoring method thereof. Background technique [0002] An optical module sending end monitoring circuit in the prior art, the monitoring circuit includes a laser component, a laser driver, a sampling resistor and a single-chip microcomputer. When the circuit is working normally, the laser diode installed in the laser component emits light, and the back to the photodiode generates a back current. Since the sampling resistor is connected in series in the current loop, as long as the common-mode voltage at both ends of the sampling resistor is collected by the single-chip microcomputer, the two The magnitude of the back photocurrent can be obtained by dividing the voltage difference at the terminal by the sampling resistor. By writing a coefficient through optical power calibration, a certain optical power can b...

AI Technical Summary

Problems solved by technology

However, the voltage collected by the single-chip microcomputer at both ends of the sampling resistor will change with various factors such as temperature, and the voltage at both ends is unstable, so the accuracy of the collection will be reduced, which cannot meet the full temperature range of the optical module sending end monitoring circuit in commercial and industrial files. Guaranteed Accuracy Requirements

Images