Abstract
In this paper, we propose an algorithm to determine the D-dimensional optimum signal constellation design (DD-OSCD), in minimum mean-square error sense, for channel capacity achieving source distribution. We then describe a D = 4-dimensional coded modulation scheme, employing N orbital angular momentum modes, two polarization states, and two in-phase/quadrature coordinates, suitable for use in future few-mode fiber (FMF) applications. Monte Carlo simulations indicate that the proposed low-density parity-check (LDPC)-coded polarization-division-multiplexed (PDM) quadrature-multiplexed (QM) DD-OSCD significantly outperforms conventional PDM-QAM (by 4.32 dB for 64-ary 3-D constellation at a BER of 10 -7). In addition, the DD-OSCD outperforms sphere packing constellations (by 0.33 dB for 8-ary 3-D constellation at a BER of 10 -7).
Original language | English (US) |
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Article number | 6243161 |
Pages (from-to) | 1325-1332 |
Number of pages | 8 |
Journal | IEEE Photonics Journal |
Volume | 4 |
Issue number | 5 |
DOIs | |
State | Published - 2012 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
Keywords
- few-mode/few-core fiber optics ommunications
- low-density parity-check (LDPC) codes
- Microwave photonics signal processing
- multidimensional coded modulation
- orbital angular momentum (OAM) modulation