Free Space Communications With Beam Steering a Two-Electrode Tapered Laser Diode Using Liquid-Crystal SLM

Feng, Feng; White, I.H.; Wilkinson, Timothy D.

doi:10.1109/jlt.2013.2262372

Cited by 57 publications

(11 citation statements)

References 28 publications

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“…In addition, the LC-based optical devices have the advantageous feature of miniature size, which is highly suitable to be integrated into photonic circuits [26,27,28]. The tunable optical features of LCs have also been adopted for the developments of waveguides [29,30,31], beam steering [32,33,34], and beam coupling [35,36,37].…”

Section: Introductionmentioning

confidence: 99%

Electrically Controlled Self-Focusing and Self-Localization in the Guided Channels

Huang

et al. 2019

Polymers

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In this paper, we demonstrate the potential of liquid crystals (LCs) on the applications of small, simple, and tunable optical guided channels. Experimental results show that three operation modes of beam coupling can be achieved, depending on the feature of the electrically controllable refractive index, the incident position, and the specific design of electrodes. The dependence of the beam polarization on self-focusing and coupling effect are also discussed. The electrically controllable self-focusing and beam coupling are highly potential on integrated photonic circuits.

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Section: Introductionmentioning

confidence: 99%

Electrically Controlled Self-Focusing and Self-Localization in the Guided Channels

Huang

et al. 2019

Polymers

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“…They are also the basic unit in a variety of applications, such as reconfigurable interconnects for intrachip systems, 19 in fiber optics, 20,21 or in free-space laser communications. 22,23 They are also the basic element in beam-steering applications, 24,25 where many developments are directed to one-dimensional (1D) pixelated devices, i.e., linear arrays, usually called liquid crystal optical phased array (LC-OPA) 24,25 when using LCs as the tunable material.…”

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confidence: 99%

Analytical modeling of blazed gratings on two-dimensional pixelated liquid crystal on silicon devices

et al. 2020

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Phase spatial light modulators and, in particular, parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplays are widely used to display programmable diffractive optical elements (DOEs). These are pixelated elements with inherent different characteristics when compared with DOEs produced with micro-optics fabrication techniques. Specifically, programmable DOEs may be affected by the fill factor, time-flicker, fringing-field and interpixel cross talk effects, and limited and quantized modulation depth of the LCoS device. Among the multilevel DOEs, we focus on the important case of the blazed gratings. We develop the corresponding analytical expressions for the diffracted field where, as novelties of this work, fill factor and flicker are introduced together with phase depth and the number of quantization levels. Different experimental-based normalizations are considered, which may lead to wrong conclusions if the fill factor is not considered in the expressions. We also analyze the differences arising between one-and two-dimensional pixelated devices. When compared with numerical procedures, our approach provides an analytical expression that facilitates the design, prediction, and discussion of experiments. As an application, we prove, for the limiting case of no interpixel cross talk, that multiorder DOEs cannot be more efficient than the equivalent single-order DOE. We also show how the results for DOEs with a unit fill factor can be adapted to DOEs with a fill factor smaller than one with a very efficient procedure.

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“…The SLM-based (15 μm pixel pitch, Meadowlark HSP512-1550) base station has a 30°FOV at 1550 nm, which is gained by 10× angle magnification of the SLM steering range (3°) using a telescope lens system. The steering range of an SLM increases with a smaller SLM pixel pitch and longer operating wavelength [9]. An increased FOV would be available with small pixel pitch SLM devices.…”

mentioning

confidence: 99%

“…The N broadcast bi-directional links have almost the same geometric loss as they use the same optical system, but experience varied diffraction efficiencies across the replay field [9] and different optical aberrations from the angle magnification lens system due to varying offsets from the optical axis of the lens system. The weighting factors of all the bi-directional transmissions in Eq.…”

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confidence: 99%

Wide field-of-view optical broadcasting for bi-directional indoor optical wireless communications employing PAM-4 modulation

Feng¹,

Sangwongngam

Faulkner

et al. 2019

Opt. Lett.

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We present wide field-of-view (FOV) bi-directional pointto-multipoint indoor optical wireless communications operating over a range of 4 m. The system is designed to integrate with fiber-to-the-home/building networks realized by a passive optical network. A phase-only spatial light modulator (SLM)-based beam steering base station with a 30°FOV broadcasts downstream transmissions to two nomadic user terminals that use mirror-based beam steering to provide a 50°FOV. At the base station, a composite phase mask is constructed on the SLM not only to perform optical broadcasting, but also to steer upstream optical transmissions from user terminals at a different wavelength. Successful upstream and downstream data transmission of 25 Gbit/s PAM4 is achieved.

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Free Space Communications With Beam Steering a Two-Electrode Tapered Laser Diode Using Liquid-Crystal SLM

Cited by 57 publications

References 28 publications

Electrically Controlled Self-Focusing and Self-Localization in the Guided Channels

Electrically Controlled Self-Focusing and Self-Localization in the Guided Channels

Analytical modeling of blazed gratings on two-dimensional pixelated liquid crystal on silicon devices

Wide field-of-view optical broadcasting for bi-directional indoor optical wireless communications employing PAM-4 modulation

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