Experimental Study of Reconfigurable Visible Light Communications Based on Holographic Spot Array Generations

Asymmetric Optical Wavelength Switch Based on LCoS-SLM for Edge Node of Optical Access Network

“…After these iteration procedures, the uniformity of spot power distribution can be further optimized since the power amplitude distribution will be reallocated. It is different from the previous research that focused on performance improvement at near-field through Fresnel approximation [19]. In our experimental works, the multispot configuration's performance at far-field was investigated through Fraunhofer approximation to better uniform spot power distribution.…”

“…Therefore, the functionalities of spectral equalization and multicasting should be included. In this research, multicasting and spectral power equalization are optimized by applying a GS algorithm [18][19] to the proposed optical wavelength switch system. Fig.…”

“…Dynamic multicasting (up to 16 ports simultaneously) and spectral equalization, which are the vital functionalities required for the optical transport network to interface with the optical fiber access network, were implemented through the design of computer-generated-holograms (CGHs). The design of these CGHs was based on an optimal procedure of the Gerchberg-Saxton (GS) algorithm [18][19]. An asymmetric optical wavelength switch system in a 4x16 switching architecture was experimentally implemented for performance evaluation.…”

“…Digital signal transmission tests were conducted at a transmission speed beyond 2.5 Gbps successfully. Progressing from our previous works in [19][20], we further report the proposed optical wavelength switch system's design consideration. The system performance evaluation, including system insertion loss, crosstalk, and data transmission tests in the multicasting scenarios, are analyzed.…”

“…Each wavelength incident on the LCoS-SLM device was controlled independently by a sub-hologram, and the used hologram can also be further replaced by using different CGHs. These CGHs were generated from an optimal designing approach [19] based on a conventional GS algorithm (a Fourier-transform based iterative algorithm). The flow chart of the optimized GS algorithm is show in Fig.…”