Collecting device for improving small-light monitoring precision and monitor signal collecting method

Abstract

The invention discloses a collecting device for improving a small-light monitoring precision and a monitor signal collecting method. The collecting device for improving the small-light monitoring precision comprises a light-receiving subunit, a sampling micro processing unit, a control micro processing unit, a first sampling resistor and a second sampling resistor, wherein one end of the second sampling resistor is connected with the ground, and the other end of the second sampling resistor is respectively connected with one end of the first sampling resistor and the control micro processing unit; the other end of the first sampling resistor is respectively connected with the sampling micro processing unit and the output of the light-receiving subunit; the control micro processing unit is controlled by a program to output a high impedance state or a low level, the sampling micro processing unit conducts voltage sampling from the first sampling resistor, and sampled voltage is converted into a digital value; and the light-receiving unit is used for outputting monitoring currents in preset proportion to the size of received light. The collecting device for improving the small-light monitoring precision and the monitor signal collecting method can improve monitoring precision when small light is input.

Description

technical field [0001] The invention relates to optical communication technology, in particular to a collection device and a monitoring signal collection method for improving the monitoring accuracy of small light. Background technique [0002] In the current domestic market and international market, optical fiber communication with high bandwidth, high speed and multi-service integration has begun to be applied. Among the many solutions, Synchronous Digital Hierarchy (SDH, Synchronous Digital Hierarchy) / Synchronous Optical Network (SONET, Synchronous Optical Network) technology has been widely used in the domestic market due to the use of optical fiber transmission. Among them, SONET defines the transmission of synchronous and isochronous information, while the SDH optical transceiver has a large capacity, which can integrate multiplexing, line transmission and switching functions, and is an integrated information transmission network operated by a unified network managemen...

AI Technical Summary

Problems solved by technology

[0016] It can be seen from the above that the existing optical module can monitor the optical monitoring accuracy of the input light by sampling the light, converting the analog to digital, and calculating the optical monitoring accuracy according to the monitoring accuracy calculation formula. However, in practical applications, the input The range of light is wide, for example, up to -37dbm ~ -10dbm, and a single sampling circuit is used to sample the current signal after photoelectric conversion, so that for input light with low optical power, the sampling error is large, thereby increasing monitoring error

For example, when the monitored input light is -30dbm, the monitoring error can reach ±3db, and when the monitored input light is -37dbm, the resulting monitoring error is even greater

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