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Proceedings Paper

High-current, high-bandwidth laser diode current driver
Author(s): David J. Copeland; Robert K. Zimmerman
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Paper Abstract

A laser diode current driver has been developed for free space laser communications. The driver provides 300 mA peak modulation current and exhibits an optical risetime of less than 400 ps. The current and optical pulses are well behaved and show minimal ringing. The driver is well suited for QPPM modulation at data rates up to 440 Mbit/s. Much previous work has championed current steering circuits; in contrast, the present driver is a single-ended on/off switch. This results in twice the power efficiency as a current steering driver. The driver electrical efficiency for QPPM data is 34 percent. The high speed switch is realized with a Ku-band GaAsFET transistor, with a suitable pre-drive circuit, on a hybrid microcircuit adjacent to the laser diode.

Paper Details

Date Published: 1 June 1991
PDF: 9 pages
Proc. SPIE 1417, Free-Space Laser Communication Technologies III, (1 June 1991); doi: 10.1117/12.43771
Show Author Affiliations
David J. Copeland, EVI Inc. (United States)
Robert K. Zimmerman, NASA/Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 1417:
Free-Space Laser Communication Technologies III
David L. Begley; Bernard D. Seery, Editor(s)

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