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Optical Engineering

Wideband Laser Diode Transmitter For Free-Space Communication
Author(s): Robert J. Smith; William L. Casey; David L. Begley
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Paper Abstract

An AIGaAs laser transmitter has been developed that dichroically combines six single-mode 830 nm laser diodes in a 100 A total band-pass. Single-mode operation of each diode is necessitated by the 20 A diode-to-diode channel spacing. An external etalon is utilized for each laser diode to maintain single-mode operation (greater than 25 dB side mode suppression) in the presence of wideband modulation [1000 mega-pulses per second (Mpps)]. A universal header accommodates diodes from various manufacturers and includes an impedance-matching net-work as well as a thermistor and heater for diode closed-loop temperature control. Diffraction-limited optics are used to maximize the combined beam far-field irradiance for free-space applications. A 218 urad output beam with less than 1.05:1 ellipticity was measured for the combined output.

Paper Details

Date Published: 1 April 1988
PDF: 8 pages
Opt. Eng. 27(4) 274344 doi: 10.1117/12.7976679
Published in: Optical Engineering Volume 27, Issue 4
Show Author Affiliations
Robert J. Smith, McDonnell Douglas Astronautics Company (United States)
William L. Casey, McDonnell Douglas Astronautics Company (United States)
David L. Begley, McDonnell Douglas Astronautics Company (United States)

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