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Browse Prior Art Database

High Performance Solid-State Laser Driver Electronics

IP.com Disclosure Number: IPCOM000036961D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Gibson, BD: AUTHOR [+2]

Abstract

Disclosed is a simple, cost-effective method of driving a solid-state laser at high performance levels.

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High Performance Solid-State Laser Driver Electronics

Disclosed is a simple, cost-effective method of driving a solid-state laser at high performance levels.

In many applications it may be required to modulate the power output of a laser at very high frequencies. Discrete laser driver designs can prove to be bulky as well as being troublesome in achieving the desired performance.

High speed, video-speed digital-to-analog converters (DACs) that are designed to drive high resolution display screens are now available. Many of these video DACs convert digital logic signals into an analog current output, a signal that can also be used to drive a laser diode. These video DACs can step the output current at rates in excess of 300 MHz. In many applications the current output of the DACs is sufficient to drive the laser directly but the output voltage range of the DAC (typically 1-2 volts) is not enough to drive most lasers. A common base amplifier remedies this problem by providing additional voltage compliance. A threshold or bias current source as well as other current sources may also be summed into the laser diode quite easily, as shown in the figure. The video DACs also supply a full- scale adjustment, making it possible to adjust or servo the full-power output of the laser.

This implementation results in a low power, low cost, high performance driver that takes up little space

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