Laser driving method and laser driving circuit in an optical module

Abstract

The invention discloses a laser driving method and a laser driving circuit in an optical module. Registers are used to store control information to control the working state of the laser driver. By adding an open-loop state before the laser driver enters the automatic closed-loop power control state, the laser driver In the initial process of power-on, it can quickly output the predetermined current value, shorten the output stabilization time of the optical module under the automatic closed-loop power control state, effectively solve the power-on overshoot phenomenon, and achieve the stability of the module when power-on. The service life of the internal optical device is increased and the effect of the initialization time of the module is satisfied.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method for driving a laser in an optical module and a laser drive circuit. Background technique [0002] The demand for intelligent high-speed optical modules in optical communication networks is increasing. The main component of the optical module is the optical transmitter module. The laser diode (LD-Laser diode) has the advantages of small size, light weight, low power drive, large output optical power, convenient modulation, A series of advantages such as long life and easy integration have become common light-emitting devices, but the laser diode is a current device, only when the forward current passing through it exceeds the threshold current I th It emits light only when it is light, in order to make it play the role of a high-speed switch, it must be added to it with a current slightly greater than the threshold value I th The DC bias current I BLAS . Such as f...

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the problem of power-on overshoot of the optical module, the present invention provides a driving method for the laser in the optical module, so as to improve the stability of the module when power-on, increase the service life of the optical devices in the optical module and meet the requirements of Effect of module initialization time

[0005] In order to solve the problem of power-on overshoot of the optical module, the driving method of the laser in the optical module of the present invention includes the following steps:

Images