Conformal Wideband Optically Addressed Transmitting Phased Array With Photonic Receiver

Shi, Shouyuan; Bai, Jian; Schneider, Garrett J.; Zhang, Yifei; Nelson, Robert L.; Wilson, John P.; Schuetz, Christopher A.; Grund, David W.; Prather, Dennis W.

doi:10.1109/jlt.2014.2317191

Cited by 19 publications

(14 citation statements)

References 31 publications

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“…The vector modulators are preceded by polarization controllers to optimize the input coupling to the phase modulator and minimize unintended amplitude modulation arising from contamination of the modulator's polarization modes with both laser wavelengths. With proper alignment, one laser wavelength is inserted into each of the phase modulator's transverse modes, which interact with the drive voltage via different components of the LN electro-optic matrix, and thereby impose a different phase shift onto the two wavelengths [5], [6]. This phase offset is preserved upon downconversion at a photodiode detector, whereas fiber-induced optical phase variations affect both wavelengths identically and have no effect.…”

Section: A Two-channel Tx System Using Polar-vector Modulatorsmentioning

confidence: 99%

Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Schneider

Murakowski

Shi

et al. 2018

IEEE Photon. Technol. Lett.

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We present the use of a novel optical modulator architecture to achieve simultaneous radiofrequency (RF) multiuser beamforming and data modulation. Optical vector modulators enable control of the complex state of a transmitted wave by directly and independently controlling both amplitude and phase. Operating in the optical domain affords extremely wide bandwidth and negligible dispersion in such modulators. A demonstration experiment is presented based on a 2-element transmit array, where the vector modulators were assembled from pairs of commercial phase and amplitude modulators. The results of the experiment show independent data directed into two different spatial beams simultaneously, using the same RF carrier.

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Section: A Two-channel Tx System Using Polar-vector Modulatorsmentioning

confidence: 99%

Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Schneider

Murakowski

Shi

et al. 2018

IEEE Photon. Technol. Lett.

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“…The optical system for steering the microwave waveform also offers the benefit of simultaneous beam multiplexing capabilities for multipoint beam directions. Several configurations based on FBG delay lines have been proposed in the past [10][11][12][13][14][15]. Nevertheless, the use of a single CFBG-based TTD provides much more flexibility and cost-effective implementation of a wideband beamforming system.…”

Section: Introductionmentioning

confidence: 99%

Highly steerable microwave beamforming system near Ku band based on the application of linearly CFBG

Raghuwanshi

Srivastava

Singh

2020

IET Optoelectronics

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“…However, no impedance matching network was used to increase the radiated RF power. Several other antennas integrated with photodetectors have already been reported in literature [21]- [32]. In [21] and [22], planar mmWave antennas with integrated photodiode are proposed, operating at 60 GHz and 120 GHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In most cases, high-power modified uni-traveling carrier (MUTC) photodiodes are applied to achieve a high radiated power, rendering electrical amplifiers unnecessary. Alternative UWB antenna topologies have also been proposed, including connected arrays [27]- [30], aperture-coupled patch antennas [31], and patch antenna arrays [32]. Owing to the extent of the achieved frequency bandwidth, multiple functionalities can be served by the same antenna aperture.…”

Section: Introductionmentioning

confidence: 99%

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Caytan

Bogaert

et al. 2018

J. Lightwave Technol.

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Abstract-A novel remote antenna unit, intended for application in the downlink of an analog radio frequency over fiber system, is proposed, whose radiated power originates entirely from the optical signal supplied by a single multi-mode fiber. By operating the photodetector of the optical receiver at zero bias voltage, while omitting typical active components, such as transimpedance amplifiers, a fully passive unit, requiring no external power supply, is obtained. Instead, a careful co-design is performed to maximize the power transfer from photodetector to antenna within the frequency range of interest using an impedance matching network. A wideband cavity-backed slot antenna is implemented in air-filled substrate-integrated-waveguide technology. The antenna feed plane serves as integration platform for the optical receiver. The resulting downlink remote antenna unit is compact, cost-effective, energy-efficient and extremely reliable. Therefore, it is an ideal building block for novel, highly specialized, ultra-high density wireless communication systems, which require massive amounts of remote antenna units, deployed in attocells as small as 15 cm ×15 cm. A prototype operating in a wide frequency bandwidth ranging from 3.30 GHz to 3.70 GHz is constructed and validated. In free-space conditions, a broadside gain of −0.2 dBi, a front-to-back ratio of 8.8 dB and linear polarization with a cross-polarization level of −28.8 dB are measured at 3.50 GHz. Furthermore, a −3 dB gain bandwidth of 500 MHz is observed. Finally, the prototype is deployed in a unidirectional data link, achieving a symbol rate of 80 MBd over a distance of 20 cm.

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Conformal Wideband Optically Addressed Transmitting Phased Array With Photonic Receiver

Cited by 19 publications

References 31 publications

Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Highly steerable microwave beamforming system near Ku band based on the application of linearly CFBG

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

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