The performance of LDPC-precoded, orbital-angular-momentum (OAM) modulation is studied over a 1-km free-space laser communication link subject to OAM modal crosstalk induced by atmospheric turbulence. The multidimensional signal constellation is designed as the Cartesian product of a one-dimensional non-negative pulse-amplitude modulation and a set of orthogonal OAM modes. We evaluate the performance of this modulation scheme by first determining conditional probability density functions (PDFs) of the modal crosstalk for each symbol, resulting from the propagation in weak turbulence using a numerical propagation model. It is observed that OAM modulation is more sensitive to atmospheric turbulence as the number of dimensions increases. However, this can be efficiently mitigated by an error-correction code. The coded OAM modulation scheme provides an energy-efficient alternative to single-mode transmission, since a larger rate can be obtained per given bandwidth.
Bibliographical noteFunding Information:
Manuscript received February 09, 2012; revised May 25, 2012; accepted June 25, 2012. Date of publication June 28, 2012; date of current version August 17, 2012. This work was supported in part by the National Science Foundation under Grant CCF-0952711, Grant ECCS-0725405, and Grant CCF-0963726, the Chilean Science and Technology Commission through Grant Fondecyt-1090709, an FAI grant from Universidad de los Andes. This work was presented in part at IEEE Globecom, Houston, TX, 2011.
- Atmospheric turbulence
- coded modulation
- free-space optical communication
- low-density parity-check (LDPC) codes
- orbital angular momentum (OAM)