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40 Gb/s indoor optical wireless system enabled by a cyclically arranged optical beamsteering receiver.

Xuebing Zhang, Yu Liu, Zizheng Cao

|February 15, 2018

Summary

A new cyclically arranged optical beamsteering (CAO-BS) method overcomes the field of view and power efficiency trade-off in 2D optical beamsteering. This innovative approach enables high-speed data transmission in indoor wireless communication systems.

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Area of Science:

Optoelectronics
Optical Communications
Wireless Technology

Background:

Indoor optical wireless communication systems require advanced optical beamsteering.
Existing 2D grating-based beamsteering faces a trade-off between field of view (FoV) and power efficiency.
Spatial light modulators (SLMs) are commonly used for active beamsteering.

Purpose of the Study:

To introduce a novel 2D beamsteering scheme, cyclically arranged optical beamsteering (CAO-BS), that breaks the FoV-power efficiency trade-off.
To demonstrate the CAO-BS scheme's effectiveness in an indoor experimental setup.
To evaluate the performance of CAO-BS in high-speed data transmission.

Main Methods:

Developed CAO-BS, which utilizes polar coordinates (1D grating + angular rotation) instead of Cartesian coordinates.
Implemented CAO-BS using a spatial light modulator (SLM) for quasi-continuous angle tuning over a 2π range.
Configured an indoor experimental system to demonstrate CAO-BS at the receiving end.

Main Results:

Achieved a field of view of 18° by 360° in polar coordinates without mechanical components.
Demonstrated increased power efficiency by reducing grating lobes in the CAO-BS system.
Successfully transmitted 40 Gbit/s on-off keying data over 1 km of single-mode fiber and 0.5 m of free space.

Conclusions:

CAO-BS offers a superior alternative to traditional 2D gratings for optical beamsteering.
The proposed scheme enhances both the field of view and power efficiency.
CAO-BS shows significant potential for future high-speed indoor optical wireless communication applications.