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Variable-Resolution Data Collection for Diode Lasers

IP.com Disclosure Number: IPCOM000041505D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Block, TR: AUTHOR [+3]

Abstract

A computer-controlled test system automatically measures the output-power versus input-current (PI) curves of GaAs semiconductor lasers. The laser PI curve can be divided into three distinct regions: a diode region, a knee region, and a lasing region. Low-resolution data collection is sufficient in the diode region. High resolution is preferred in the threshold region to help define the threshold point, while medium to high resolution is used for the lasing region. To define the limits of the three regions, an initial very low-resolution sampling is performed to find a point on the laser curve above the lasing threshold, bracketing of the knee of the curve. At this point, data for a full curve can be collected using predefined resolutions for the three curve regions.

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Variable-Resolution Data Collection for Diode Lasers

A computer-controlled test system automatically measures the output-power versus input-current (PI) curves of GaAs semiconductor lasers. The laser PI curve can be divided into three distinct regions: a diode region, a knee region, and a lasing region. Low-resolution data collection is sufficient in the diode region. High resolution is preferred in the threshold region to help define the threshold point, while medium to high resolution is used for the lasing region. To define the limits of the three regions, an initial very low-resolution sampling is performed to find a point on the laser curve above the lasing threshold, bracketing of the knee of the curve. At this point, data for a full curve can be collected using predefined resolutions for the three curve regions. Depending upon the results for a particular laser, any peculiarities in selected regions can be reduced by increasing the resolution for that region and generating additional points.

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