Expansion of multi-rate capabilities for agile DPSK lasercom transceivers (Conference Presentation)

David O. Caplan; P. Stephan Bedrosian; Jade P. Wang

doi:10.1117/12.2510630

4 March 2019 Expansion of multi-rate capabilities for agile DPSK lasercom transceivers (Conference Presentation)

David O. Caplan, P. Stephan Bedrosian, Jade P. Wang

Proceedings Volume 10910, Free-Space Laser Communications XXXI; 1091010 (2019) https://doi.org/10.1117/12.2510630
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Flexible multi-rate capabilities are attractive for communications over the dynamic free-space optical (FSO) channel since it enables links to be efficiently established over a variety of distances, channel conditions, aperture sizes, and transmitter power levels. Recently, multi-rate differential phase shift keying (DPSK) modulation has been shown to provide good performance with modest complexity over a wide range of data rates. For these reasons, multi-rate DPSK has become the high-rate baseline format for NASA’s Laser Communication Relay Demonstration (LCRD) and other space-based FSO systems currently in development, operating at channel rates from 72 Mbit/s to 2.88 Gbit/s. Here, we report WDM-scalable power-efficient optical-transceiver advances that can extend single-channel rates by a factor of four to 11.52 Gbit/s using LCRD-compatible waveforms. Transmitter waveforms are implemented using time-frequency-windowed directly modulated lasers (DMLs) that can generate burstmode 2-DPSK and 4-DPSK waveforms at the standard LCRD 2.88 GHz symbol rate and twice the rate at 5.76 GHz. At the receiver, standard 2.88 GHz delay-line-interferometer (DLI) based demodulation is implemented for 2-DPSK. For 4-DPSK, a second 2.88 GHz DLI is required to demodulate the 2-bit-persymbol format, with the pair of DLIs biased at ±/4. With proper precoding of the transmitter waveforms, the double-rate 5.76 GHz symbols may be demodulated using the same 2.88 GHz DLIs using non-adjacent DPSK demodulation. In this manner, a common DPSK receiver platform may be used to demodulate standard multi-rate LCRD waveforms as well as 4-DSPK waveforms at 1x and 2x the standard symbol rate.

Conference Presentation

Citation Download Citation

David O. Caplan, P. Stephan Bedrosian, and Jade P. Wang "Expansion of multi-rate capabilities for agile DPSK lasercom transceivers (Conference Presentation)", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091010 (4 March 2019); https://doi.org/10.1117/12.2510630

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KEYWORDS

Laser communications

Free space optics

Transmitters

Demodulation

Modulation

Receivers

Channel projecting optics

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