High-speed photodetectors in optical communication system

Zhao, Zeping; Liu, Jianguo; Liu, Yu; Zhu, Ning

doi:10.1088/1674-4926/38/12/121001

Cited by 59 publications

(26 citation statements)

References 57 publications

(51 reference statements)

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“…The broadband OE conversion can be realized by either photovoltaic or photoconductive effect, which converts the optical power into an electrical current. Different types of photodetectors (PDs) are developed to achieve the OE conversion [14], including waveguide PD, uni-traveling carrier PD (UTC-PD), velocity-matched distributed PD, traveling-wave PD and so on [15].…”

Section: The Features Of Microwave Photonicsmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

273

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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Section: The Features Of Microwave Photonicsmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

273

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“…Although commercial photodiodes have demonstrated high modulation bandwidths of up to gigahertz, the detection areas of these photodiodes are limited to only a few square millimeters. This is largely attributed to the resistance-capacitance limit of the photodiode [93]. Considering the severe conditions in underwater environments and to relieve the strict PAT requirement, large-area photoreceivers with higher modulation speeds are essential for both practicality and to improve the connectivity among trillions of IoUT devices.…”

Section: Omnidirectional Fiber Photodetector With Large Active Areamentioning

confidence: 99%

A Review on Practical Considerations and Solutions in Underwater Wireless Optical Communication

Sun

Ooi

Kang

et al. 2020

J. Lightwave Technol.

162

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Underwater wireless optical communication (UWOC) has attracted increasing interest in various underwater activities because of its order-of-magnitude higher bandwidth compared to acoustic and radio-frequency technologies. Testbeds and pre-aligned UWOC links were constructed for physical layer evaluation, which verified that UWOC systems can operate at tens of gigabits per second or close to a hundred meters of distance. This holds promise for realizing a globally connected Internet of Underwater Things (IoUT). However, due to the fundamental complexity of the ocean water environment, there are considerable practical challenges in establishing reliable UWOC links. Thus, in addition to providing an exhaustive overview of recent advances in UWOC, this paper addresses various underwater challenges and offers insights into the solutions for these challenges. In particular, oceanic turbulence, which induces scintillation and misalignment in underwater links, is one key factor in degrading UWOC performance. Novel solutions are proposed to ease the requirements on pointing, acquisition, and tracking (PAT) for establishing robustness in UWOC links. The solutions include light-scattering-based non-line-of-sight (NLOS) communication modality as well as PAT-relieving scintillating-fiber-based photoreceiver and large-photovoltaic cells as the optical signal detectors. Naturally, the dual-function photovoltaic-photodetector device readily offers a means of energy harvesting for powering up future IoUT sensors.

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“…The confluence of nanophotonics and optoelectronics offers an unprecedented ability to control light matter interactions. Dielectric metasurfaces allow the improvement of both the light collection efficiency [ 8 ] and bandwidth [ 9 ], which are two crucial components in the photodetector design. Many semiconductors have a high refractive index in the NIR and visible range of the electromagnetic spectrum that leads to unique optical properties such as a non-radiating anapole state localizing the electric field inside semiconductor nanoparticles [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Near-Infrared Detector Based on Optically Resonant Dielectric Nanodisks

Saadabad

Pauly²,

Herschbach³

et al. 2021

Nanomaterials

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Fast detection of near-infrared (NIR) photons with high responsivity remains a challenge for photodetectors. Germanium (Ge) photodetectors are widely used for near-infrared wavelengths but suffer from a trade-off between the speed of photodetection and quantum efficiency (or responsivity). To realize a high-speed detector with high quantum efficiency, a small-sized photodetector efficiently absorbing light is required. In this paper, we suggest a realization of a dielectric metasurface made of an array of subwavelength germanium PIN photodetectors. Due to the subwavelength size of each pixel, a high-speed photodetector with a bandwidth of 65 GHz has been achieved. At the same time, high quantum efficiency for near-infrared illumination can be obtained by the engineering of optical resonant modes to localize optical energy inside the intrinsic Ge disks. Furthermore, small junction capacitance and the possibility of zero/low bias operation have been shown. Our results show that all-dielectric metasurfaces can improve the performance of photodetectors.

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High-speed photodetectors in optical communication system

Cited by 59 publications

References 57 publications

Microwave Photonic Radars

Microwave Photonic Radars

A Review on Practical Considerations and Solutions in Underwater Wireless Optical Communication

Highly Efficient Near-Infrared Detector Based on Optically Resonant Dielectric Nanodisks

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