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Analog Circuit Design by Jim Williams, Bob Dobkin

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17

Current sources for fiber optic lasersA compendium of pleasant current events

Jim Williams

Introduction

A large group of fiber optic lasers are powered by DC current. Laser drive is supplied by a current source with modulation added further along the signal path. The current source, although conceptually simple, constitutes an extraordinarily tricky design problem. There are a number of practical requirements for a fiber optic current source and failure to consider them can cause laser and/or optical component destruction.

Design criteria for fiber optic laser current sources

Figure 17.1 shows a conceptual laser current source. Inputs include a current output programming port, an output current clamp and an enable command. Laser current is the sole ...

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