High-Performance Chirped Electrode Design for Cat's Eye Retro-Reflector Modulators

Goetz, Peter G.; Rabinovich, W. S.; Binari, S.C.; Mittereder, J.

doi:10.1109/lpt.2006.884725

Cited by 25 publications

(8 citation statements)

References 13 publications

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“…Since the coating and the EOM are very thin, the 532-nm beam can still transit along the path of the 1064-nm fundamental beam. Nanoparticle film modulator or pixelated multiple quantumwell (MQW) modulator can be employed here [24,25], as they are thin enough. Different from the previous work, here we place the EOM at the pupil of RR1 so that the area of the EOM can be small.…”

Section: (B)mentioning

confidence: 99%

Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Xiong,

Liu,

Wang

et al. 2021

Preprint

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Optical wireless communication (OWC) meets the demands of the future six-generation mobile network (6G) as it operates at several hundreds of Terahertz and has the potential to enable data rate in the order of Tbps. However, most beam-steering OWC technologies require high-accuracy positioning and high-speed control. Resonant beam communication (RBCom), as one kind of nonpositioning OWC technologies, has been proposed for high-rate mobile communications. The mobility of RBCom relies on its self-alignment characteristic where no positioning is required. In a previous study, an external-cavity second-harmonic-generation (SHG) RBCom system has been proposed for eliminating the echo interference inside the resonator. However, its energy conversion efficiency and complexity are of concern. In this paper, we propose an intra-cavity SHG RBCom system to simplify the system design and improve the energy conversion efficiency. We elaborate the system structure and establish an analytical model. Numerical results show that the energy consumption of the proposed intra-cavity design is reduced to reach the same level of channel capacity at the receiver compared with the external-cavity one.

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Section: (B)mentioning

confidence: 99%

Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Xiong,

Liu,

Wang

et al. 2021

Preprint

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“…Nevertheless, even narrow-band optical filters are used, the modulator still has to operate at tens of GHz to ensure that the signal frequency lies out of the filter's passband. As high-speed modulation is supported by splitting the modulator's surface into small pixels, the driving power as well as the temperature will increase to a prohibitive level [17]. The demands for a practical and economic echo-interference-free RBCom systems motivate this work.…”

Section: Retroreflectormentioning

confidence: 99%

Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Xiong,

Liu,

Jiang

et al. 2021

Preprint

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Optical wireless communications (OWC) which utilizes infrared or visible light as the carrier attracts great attention in 6G research. Resonant beam communications (RBCom) is an OWC technology which simultaneously satisfies the needs of non-mechanical mobility and high signal-to-noise ratio (SNR). It has the self-alignment feature and therefore avoids positioning and pointing operations. However, RBCom undergoes echo interference. In this paper, we propose an echo-interference-free RBCom system design based on second harmonic generation. The transmitter and the receiver constitute a spatially separated laser resonator, in which the retro-reflective resonant beam is formed and tracks the receiver automatically. This structure provides a channel with adaptive capability in beamforming and alignment, which is similar to the concept of intelligent reflecting surface (IRS) enhanced communications, but without hardware and software controllers. Besides, we establish an analytical model to evaluate the beam radius, the beam power, and the channel capacity. The results show that our system achieves longer distance and smaller beam diameter for the transmission beyond 10 Gbit/s, compared with the existing OWC technologies.

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“…To form the p-electrode, the inner mesa was etched up to the top surface of p-doped GaAs contact layer to form a trench of width 50µm, while to form the n-electrode, the outer mesa was etched up to the top surface of n-doped GaAs contact layer so that the device consists of two pixels having an area 2mm ‰ 0.5mm. Fish-bone grid n-electrode was formed on top of n-GaAs contact layer to achieve uniform frequency response over a large area [2,24]. To operate both the absorptive cavities simultaneously, the edges of the finger lines at the outer periphery is connected to the bottom n-electrode by using SiN x as the isolating layer, as shown in Fig.…”

Section: Design Growth and Fabricationmentioning

confidence: 99%

Coupled tandem cavities based electro-absorption modulator with asymmetric tandem quantum well for high modulation performance at low driving voltage

Na¹,

Ju²,

Choi³

et al. 2013

Opt. Express

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We propose and demonstrate a new electro-absorption modulator (EAM) based on coupled tandem cavities (CTC) having asymmetric tandem quantum well (ATQW) structure with separated electrode configuration to achieve large transmittance change over a broad spectral range at low driving voltage for high definition (HD) 3D imaging applications. Our theoretical calculations show that CTC with ATQW structure can provide large transmittance change over a wide spectral range at low driving voltage. By introducing separated electrode configuration, the fabricated EAM having CTC with ATQW structure shows a large transmittance change over 50%, almost three times larger spectral bandwidth compared to that of EAM having single cavity with a single thickness quantum well without significantly increasing the applied voltage. In addition, the CTC with ATQW structure also shows high speed modulation up to 28 MHz for the device having a large area of 2 mm x 0.5 mm. This high transmittance change, large spectral bandwidth and low voltage operation over a large device area for the EAM having CTC with ATQW demonstrates their huge potential as an optical image modulator for HD 3D imaging applications.

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High-Performance Chirped Electrode Design for Cat's Eye Retro-Reflector Modulators

Cited by 25 publications

References 13 publications

Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Coupled tandem cavities based electro-absorption modulator with asymmetric tandem quantum well for high modulation performance at low driving voltage

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