Abstract
A free space optical interconnects system that uses Gaussian beams and focusing microlenses with spherical aberration has been considered. Numerical results show that the use of microlenses with negative spherical improves the signal-to-crosstalk ratio of the interconnects system at some optimum positions of the detector array. An expression for output field at the detectors plane is derived and used to evaluate the signal-to-crosstalk ratio.
Highlights
Microlenses (MLs) and microlenses arrays have become indispensable micro optical devices in free space optical interconnects (FSOIs) systems [Wang, Nirmalathas, 2018]
In this paper we show that MLs aberrations can be exploited to reduce the crosstalk in FSOIs systems that use spherically aberrated ML
The diffraction crosstalk power received by the intended detector can be found as the power received by all neighboring detectors from the light coming through intended microlens assuming only the intended light source is on
Summary
Microlenses (MLs) and microlenses arrays have become indispensable micro optical devices in free space optical interconnects (FSOIs) systems [Wang, Nirmalathas, 2018]. These MLs are used to gather the light and to focus it on a detector array. In [Al-Ababneh, 2014], analytical models to evaluate the optical crosstalk taking the effect of ML aperture were proposed. In [Al-Ababneh, 2016] the impact of the spherical aberrations on the spot size and the light intensity for Gaussian beam passing through a free space optical interconnects is explained. The effect of the lens with negative spherical aberrations (SA) on the propagated beam is to shift the beam focus toward the detector array.
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