Pulse position modulation/demodulation with picosecond slot widths

Kevin M. Birnbaum; William H. Farr

doi:10.1117/12.763932

13 February 2008 Pulse position modulation/demodulation with picosecond slot widths

Kevin M. Birnbaum, William H. Farr

Proceedings Volume 6877, Free-Space Laser Communication Technologies XX; 68770K (2008) https://doi.org/10.1117/12.763932
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

Pulse position modulation (PPM) is the preferred signaling format for deep space optical communications. Its high peak to average power ratio easily supports efficient forward error correction codes that operate within one dB of capacity at efficiencies better than one bit per detected photon when using photon counting detectors. Sub-100 picosecond slot widths are desired for efficient gigabit/second data links, but slot widths are limited by the jitter of available single photon detectors and laser modulators. Presently, the slot width must be larger than the receiver detector jitter and the transmitter modulator transition times. We show techniques whereby the slot time can be reduced, such that the jitter limitation is no longer the slot width but rather the PPM symbol duration.

Citation Download Citation

Kevin M. Birnbaum and William H. Farr "Pulse position modulation/demodulation with picosecond slot widths", Proc. SPIE 6877, Free-Space Laser Communication Technologies XX, 68770K (13 February 2008); https://doi.org/10.1117/12.763932

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