Method for stabilizing extinction ratio of optical module

Abstract

The invention provides a method for stabilizing an extinction ratio of a module. A TOSA, a laser driver unit and a module control unit (MCU) are adopted, wherein the laser driver unit comprises a biascurrent controller unit and a laser drive controller unit, a second DAC2 is arranged between the laser drive controller unit and the bias current controller unit, a voltage acquisition unit is further adopted, and the MCU acquires and calculates current power supply voltage through the voltage acquisition unit; an optimal bias current set value Ibias1 is obtained according to the current voltageand a voltage lookup table; current LD bias current set value Ibias2 is acquired; whether the current bias current set value Ibias2 is consistent with the optimal bias current set value Ibias1 is judged; if yes, the bias current adjustment is ended, and if not, the optimal bias current set value Ibias1 is reset. The method can keep the extinction ratio of the optical module stable when the power supply voltage changes.

Description

technical field [0001] The invention relates to an optical module, in particular to a method for stabilizing the extinction ratio of the optical module. Background technique [0002] To measure the performance of an optical module, it depends on whether it can achieve the required transmission distance without generating bit errors and the channel cost meets the index requirements. There are many factors that affect the transmission performance of optical modules, among which the extinction ratio (ExtinctionRatio, hereinafter referred to as ER) is a very critical factor. If the ER is too small, it will affect the judgment of the optical signal at the receiving end, reduce the sensitivity of the received optical signal, and affect the transmission of the optical module. If the ER is too high, the chirp effect of the laser will increase, resulting in serious signal degradation after transmission, resulting in bit errors or excessive channel costs, which will affect the tran...

AI Technical Summary

Problems solved by technology

To achieve the purpose of stabilizing the extinction ratio, if the external voltage regulator circuit is designed to ensure the stability of the laser power supply, it will not only increase the cost of the entire module, but the most important problem is that for the small hot-swappable package QSFP28 structure, adding components Packaging challenges that create insufficient internal structure space

Images