Temperture compensating method and apparatus for extinction ratio parameter without cooling laser

Abstract

The invention discloses the temperature compensating method and the setting of the extinction ratio parameter of the laser without the refrigeration, the temperature measuring setting, the controlling setting and the digital electricity position setting / DA switching setting are adopted in the adjusting current controlling circuit of the laser setting without the refrigeration, one determined in advance function relation can be written into the controller, the said function relation can maintain the relation between the adjusting current with the constant extinction rate and the existing temperature during the temperature changing course, the said adjusting current can be controlled and exported by the digital electric digit setting / DA controller, the several temperature adjusting on the every laser without the refrigeration can be avoided, the needing of the mass production can be satisfied on the instance of the ensuring the compensating precision. The invention can adjust the laseron the norm temperature, and the adjusting course is containing in the adjusting course of the laser driving circuit.

Description

Temperature Compensation Method and Device for Extinction Ratio Parameter of Uncooled Laser technical field The invention relates to a digital optical fiber transmission system, in particular to a method and a device for compensating the extinction ratio parameter of an output light signal of an unrefrigerated laser in the optical transmission system. Background technique There are a large number of applications of uncooled lasers in optical communication equipment, and they are generally used in direct modulation applications. At this time, the bias current provided to the uncooled laser is usually near its threshold current, and the modulation current carrying the digital logic signal is added above the bias current. If P1 and P0 are defined as the output optical power of the laser when the digital logic signal is "1" and "0" respectively, then the average output optical power P of the laser = (P1+P0) / 2, and the extinction ratio index ER = P1 / P0. When the temperature ...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to provide a temperature compensation method and device for the extinction ratio parameter of an uncooled laser, and to solve the technical problem in the prior art that each uncooled laser needs to be calibrated at multiple temperature points

Images