Compact optical transmitters for CubeSat free-space optical communications

R. W. Kingsbury; D. O. Caplan; K. L. Cahoy

doi:10.1117/12.2080122

16 March 2015 Compact optical transmitters for CubeSat free-space optical communications

R. W. Kingsbury, D. O. Caplan, K. L. Cahoy

Proceedings Volume 9354, Free-Space Laser Communication and Atmospheric Propagation XXVII; 93540S (2015) https://doi.org/10.1117/12.2080122
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

We present the results of an architectural trade study and prototype implementation of an optical transmitter suitable for resource-constrained CubeSats. Recent advances in CubeSat attitude determination and control systems have made it possible to achieve three-axis stabilization. This is essential for laser communications systems, which have challenging pointing and stability requirements. Our downlink terminal design fits in a 10 cm x 10 cm x 5 cm volume, uses < 10W of power, weighs < 1 kg, and supports data rates up to 50 Mbps. The terminal incorporates pointing, tracking and acquisition optics, an optical fine-steering mechanism, and a compact transmitter. This work focuses on the development of the transmitter for the Nanosatellite Optical Downlink Experiment (NODE). Two transmitter architectures were considered initially: direct modulation of a high-power laser diode and a master oscillator power amplifier (MOPA). The MOPA-based approach was selected and a prototype "breadboard" was built from commercially available components. The prototype transmitter produces high fidelity (extinction ratio, ER < 33 dB) pulse position modulation (PPM) waveforms at 1550nm with 200mW average output power while consuming 6:5W of electrical power.

Citation Download Citation

R. W. Kingsbury, D. O. Caplan, and K. L. Cahoy "Compact optical transmitters for CubeSat free-space optical communications", Proc. SPIE 9354, Free-Space Laser Communication and Atmospheric Propagation XXVII, 93540S (16 March 2015); https://doi.org/10.1117/12.2080122

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