Two-dimensional wavelength routing for transparent optical wireless networking

Haiyan Shi; Kefei Liang; Stephen J. Sheard; Dominic C. O'Brien; Grahame E. Faulkner

doi:10.1117/12.620016

31 August 2005 Two-dimensional wavelength routing for transparent optical wireless networking

Haiyan Shi, Kefei Liang, Stephen J. Sheard, Dominic C. O'Brien, Grahame E. Faulkner

Proceedings Volume 5892, Free-Space Laser Communications V; 58920Z (2005) https://doi.org/10.1117/12.620016
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

In this article a novel system architecture that uses a combination of wavelength and spatial diversity for indoor infrared wireless communications is presented. This configuration promises to fully exploit the available bandwidth of optics and demonstrate all-optical networking. Electronic processing is restricted to mobile terminals, with base stations potentially remaining passive, without any conversion between optics and electronics. For the downlink, multiple transmitter beams with different wavelengths are steered from the fiber infrastructure through the base station to mobile terminals located in different positions. An optimum combination of diffractive optics and reflective optics (a diffraction grating and an array of mirrors) can flexibly steer each transmitter beam and enable full control over the required coverage pattern. For the uplink, in the transmitter, another grating and an array of mirrors can direct multiple beams upward from different mobile users toward the base station. System simulation shows that the downlink has the potential to approach 10 Gbit/s, while maintaining wide-area coverage (such as in a room of 3m×4m×4m) with the help of fine optical tracking. System modeling indicates that the uplink is more susceptible to power losses than the downlink, but the utilization of dynamic beam steering in the uplink can suppress power losses to a tolerable level (e.g. below 30dB). An array of 16 mirrors has been designed to implement point-to-point beam steering in a room of 3m×1m×1m. Two-dimensional coverage patterns measured at a distance of 0.5 m and 1.5 m coincide with simulation results. Operation at 1 Gbit/s has been demonstrated successfully for tracking in two dimensions.

Citation Download Citation

Haiyan Shi, Kefei Liang, Stephen J. Sheard, Dominic C. O'Brien, and Grahame E. Faulkner "Two-dimensional wavelength routing for transparent optical wireless networking", Proc. SPIE 5892, Free-Space Laser Communications V, 58920Z (31 August 2005); https://doi.org/10.1117/12.620016

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