Rothe, Stefan;
Barbosa, fabio;
Czarske, Juergen;
Marques Ferreira, Filipe;
(2024)
Unlocking Mode Programming Using Computer-Generated Hologram Optimisation for Spatially Multiplexed Network.
IOP Journal of Physics: Photonics
, 7
, Article 015002. 10.1088/2515-7647/ad9209.
Preview |
PDF
UnlockingModeProgramming_TUD_UCL_arxiv_V2.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Programmable optical devices provide performance enhancement and flexibility to spatial multiplexing systems enabling transmission of tributaries in high-order eigenmodes of spatially-diverse transmission media, like multimode fibre (MMF). Wavefront shaping with spatial light modulators (SLMs) facilitates scalability of the transmission media by allowing for channel diagonalization and quasi-single-input single-output operation. Programmable mode multiplexing configurations such as multi-plane light conversion (MPLC) offer the potential to simultaneously launch an arbitrary subset of spatial tributaries in any N-mode MMF. Such programmable optical processor would enable the throughput of space-division multiplexing (SDM) systems to be progressively increased by addressing a growing number of tributaries over one MMF and in this way meet a growing traffic demand – similarly to the wavelength-division multiplexing evolution path. Conventionally, MPLC phasemasks are calculated using the wavefront matching algorithm (WMA). However, this method does not exploit the full potential of programmable mode multiplexers. We show, that computer-generated hologram algorithms like direct search enable significant improvement compared to the conventional WMA-approach. Such gains are enabled by tailored cost functions with dynamic constraints concerning insertion loss as well as mode extinction ratio. We show that average mode extinction ratio can be greatly improved (≈ 15 dB) at the expense of a small insertion loss degradation of < 3 dB. One particular feature of programmable mode multiplexers is the adaptability to optimised transmission functions. We employ our approach on Schmidt modes, which are spatial eigenchannels with minimum crosstalk derived from a measured transmission matrix.
| Type: | Article |
|---|---|
| Title: | Unlocking Mode Programming Using Computer-Generated Hologram Optimisation for Spatially Multiplexed Network |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/2515-7647/ad9209 |
| Publisher version: | http://dx.doi.org/10.1088/2515-7647/ad9209 |
| Language: | English |
| Additional information: | Original Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204916 |
Loading...
Loading...Loading...Loading...Archive Staff Only
 |
View Item |
