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Proceedings Paper

Ten Gb/s optically pre-amplified RZ-DPSK for FSO communications systems with very large link losses
Author(s): Christoph Wree; Charles P. Collier; Steven Lane; Alan Turney; Ben Armentrout; Jesse Yates; Nathaniel Francis; Abhay Joshi
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Paper Abstract

For free-space optical (FSO) communications systems, sensitive optical receivers are the key to closing the link over long distances in inter-satellite transmission scenarios, or to overcome large atmospheric attenuation in terrestrial FSO systems. We present a 10.7 Gb/s optical transmitterreceiver pair operating at 1550-nm, based on return-to-zero, differential phase-shift keying (RZDPSK). The receiver is pre-amplified and uses an optical delay interferometer and a balanced photo-receiver. The outer dimensions, the weight, and power consumption are 44×44×18 cm3, 14.1 kg, and 35 W, respectively. This optical receiver is single-mode fiber coupled. At 10.7 Gb/s, a receiver sensitivity of 27 photons/bit was measured, which yields a bit error rate of 1e-9. This is less than 1 dB from the quantum limit (22 photons/bit). Coupled with a commercial optical booster amplifier having an output power of about +37 dBm, a link loss of more than 80 dB can be bridged. In an inter-satellite communications scenario, this corresponds to several tens of thousands of kilometers. Additionally, high link losses can also be experienced in terrestrial systems as the result of atmospheric scintillation. To study this effect, the transmitter and receiver combination were tested with simulated turbulence (scintillation). A turbulence box was used to emulate different levels of scintillation under which the pre-amplified RZ-DPSK system was investigated. Results of these tests are presented.

Paper Details

Date Published: 19 August 2008
PDF: 12 pages
Proc. SPIE 7091, Free-Space Laser Communications VIII, 709103 (19 August 2008); doi: 10.1117/12.793784
Show Author Affiliations
Christoph Wree, Discovery Semiconductors (United States)
Charles P. Collier, Science Applications International Corp. (United States)
Steven Lane, Air Force Research Lab. (United States)
Alan Turney, Air Force Research Lab. (United States)
Ben Armentrout, Schafer Corp. (United States)
Jesse Yates, Schafer Corp. (United States)
Nathaniel Francis, Air Force Research Lab. (United States)
Abhay Joshi, Discovery Semiconductors (United States)

Published in SPIE Proceedings Vol. 7091:
Free-Space Laser Communications VIII
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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