Optical Module Laser Startup Stabilization

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Solution Overview

Problem

DWDM optical modules face challenges in stabilizing optical signals during power-up, as changes in current before reaching normal operating levels can affect adjacent wavelength windows, leading to interference and reduced transmission capacity.

Innovation Solution

A method and apparatus that adjust the temperature and current of the laser device in a DWDM optical module in a stepwise manner, starting with a temperature higher than the normal operating temperature and a current lower than the normal operating current, and gradually adjusting to the normal levels, to stabilize the optical signal wavelength and prevent interference with adjacent channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the laser device is powered up with normal operating current immediately, then the power-up speed is fast, but the optical signal wavelength fluctuates and interferes with adjacent wavelength channels

Engineering Contradiction:

Improvepower-up speedVSAvoidwavelength fluctuation and interference

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by adjusting the temperature of the laser device to a first temperature higher than the normal operating temperature before powering up the laser device. This preliminary temperature adjustment prepares the laser device for stable operation, preventing wavelength fluctuations and interference with adjacent channels during the power-up process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by continuously adjusting both the temperature and current of the laser device during the power-up process. The temperature is adjusted from the first temperature to a second temperature, and the current is adjusted from the first current to the normal operating current, allowing the system to adapt dynamically to maintain stable optical signal transmission.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If the temperature is adjusted from a higher temperature to normal operating temperature with stepwise current adjustment, then the optical signal stability is improved, but the power-up time increases

Engineering Contradiction:

Improveoptical signal stabilityVSAvoidpower-up time

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The patent applies segmentation by dividing the power-up process into multiple stages: first adjusting the temperature to a higher first temperature, then adjusting to the normal operating temperature, while simultaneously adjusting the current from a first current to the normal operating current. This segmented approach ensures stable optical signal transmission while managing the overall power-up time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements feedback by continuously monitoring and adjusting the temperature and current of the laser device during the power-up process. The system adjusts the temperature from the first temperature to the second temperature and the current from the first current to the normal operating current based on the stability requirements of the optical signal, ensuring optimal performance.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach ensures stable optical signal transmission by minimizing wavelength fluctuations, maintaining signal integrity and preventing interference with adjacent wavelength channels, thereby enhancing transmission capacity and performance.

Implementation Method 1

a laser device of the optical module

Methodology Applied

Scientific EffectLight emission from laser device: Laser

Implementation Method 2

adjusting temperature of a laser device of the optical module to a first temperature higher than a normal operating temperature

Methodology Applied

Scientific EffectThermal effect on laser wavelength: Temperature Gradient

Data Source

PatentUS10432314B2Method and apparatus for starting an optical module

Publication Date: 2019.10.01 HISENSE BROADBAND MULTIMEDIA TECH

AI summary

The application discloses a method and apparatus for starting an optical module. The method includes: adjusting temperature of a laser device of the optical module to a first temperature higher than a normal operating temperature of the laser device of the optical module; powering up the laser device of the optical module using a first current lower than a normal operating current of the laser device; and adjusting the temperature of the laser device of the optical module from the first temperature to the normal operating temperature according to a second temperature corresponding to each adjustment, and adjusting the current of the laser device of the optical module from the first current to the normal operating current according to a second current corresponding to each adjustment, for a preset times of adjustment.