scholarly journals Ge-rich SiGe-based wideband polarization insensitive photonic platform for mid-infrared free-space communications

2019 ◽  
Author(s):  
Vladyslav Vakarin ◽  
Joan Manel Ramírez ◽  
Jacopo Frigerio ◽  
Qiankun Liu ◽  
Andrea Ballabio ◽  
...  
Keyword(s):  
Free Space ◽  
Space Communications ◽  
Mid Infrared ◽  
Polarization Insensitive

scholarly journals Wideband Ge-Rich SiGe Polarization-Insensitive Waveguides for Mid-Infrared Free-Space Communications

2018 ◽  
Vol 8 (7) ◽  
pp. 1154 ◽  
Author(s):  
Vladyslav Vakarin ◽  
Joan Ramírez ◽  
Jacopo Frigerio ◽  
Qiankun Liu ◽  
Andrea Ballabio ◽  
...  
Keyword(s):  
Free Space ◽  
Communication Systems ◽  
Quantum Cascade Lasers ◽  
Building Blocks ◽  
Ultra Wideband ◽  
Power Splitting ◽  
Space Communications ◽  
Mid Infrared ◽  
Atmospheric Transparency ◽  
Polarization Insensitive

The recent development of quantum cascade lasers, with room-temperature emission in the mid-infrared range, opened new opportunities for the implementation of ultra-wideband communication systems. Specifically, the mid-infrared atmospheric transparency windows, comprising wavelengths between 3–5 µm and 8–14 µm, have great potential for free-space communications, as they provide a wide unregulated spectrum with low Mie and Rayleigh scattering and reduced background noise. Despite the great efforts devoted to the development of mid-infrared sources and detectors, little attention is dedicated to the management of polarization for signal processing. In this work, we used Ge-rich SiGe alloys to build a wideband and polarization-insensitive mid-infrared photonic platform. We showed that the gradual index change in the SiGe alloys enabled the design of waveguides with remarkably low birefringence, below 2 × 10−4, over ultra-wide wavelength ranges within both atmospheric transparency windows, near wavelengths of 3.5 µm and 9 µm. We also report on the design of a polarization-independent multimode interference device achieving efficient power splitting in an unprecedented 4.5-µm bandwidth at around 10-µm wavelength. The ultra-wideband polarization-insensitive building blocks presented here pave the way for the development of high-performance on-chip photonic circuits for next-generation mid-infrared free-space communication systems.

scholarly journals Perspectives on advances in high-capacity, free-space communications using multiplexing of orbital-angular-momentum beams

APL Photonics ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 030901
Author(s):  
Alan E. Willner ◽  
Zhe Zhao ◽  
Cong Liu ◽  
Runzhou Zhang ◽  
Haoqian Song ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Free Space ◽  
High Capacity ◽  
Space Communications

scholarly journals Polarization-insensitive reverse-ridge AlGaAs waveguide for the mid-infrared supercontinuum generation

2021 ◽  
pp. 127407
Author(s):  
Luqi Zhang ◽  
Jinhui Yuan ◽  
Yujun Cheng ◽  
Chao Mei ◽  
Jintao Lai ◽  
...  
Keyword(s):  
Supercontinuum Generation ◽  
Mid Infrared ◽  
Polarization Insensitive

Silicon photonic devices for mid-infrared applications

Nanophotonics ◽  
2014 ◽  
Vol 3 (4-5) ◽  
pp. 329-341 ◽  
Author(s):  
Raji Shankar ◽  
Marko Lončar
Keyword(s):  
Gas Sensing ◽  
Wavelength Region ◽  
Photonic Devices ◽  
Ring Resonators ◽  
Space Communications ◽  
Mid Infrared ◽  
Silicon Photonic ◽  
Processing Techniques ◽  
Silicon Based

AbstractThe mid-infrared (IR) wavelength region (2–20 µm) is of great interest for a number of applications, including trace gas sensing, thermal imaging, and free-space communications. Recently, there has been significant progress in developing a mid-IR photonics platform in Si, which is highly transparent in the mid-IR, due to the ease of fabrication and CMOS compatibility provided by the Si platform. Here, we discuss our group’s recent contributions to the field of silicon-based mid-IR photonics, including photonic crystal cavities in a Si membrane platform and grating-coupled high-quality factor ring resonators in a silicon-on-sapphire (SOS) platform. Since experimental characterization of microphotonic devices is especially challenging at the mid-IR, we also review our mid-IR characterization techniques in some detail. Additionally, pre- and post-processing techniques for improving device performance, such as resist reflow, Piranha clean/HF dip cycling, and annealing are discussed.

Chaos synchronization in mid-infrared quantum cascade lasers for private free-space communication

2021 ◽  
Author(s):  
Olivier Spitz ◽  
Andreas Herdt ◽  
Gregory Maisons ◽  
Mathieu Carras ◽  
Wolfgang Elsaser ◽  
...  
Keyword(s):  
Free Space ◽  
Chaos Synchronization ◽  
Quantum Cascade Lasers ◽  
Space Communication ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Cascade Lasers ◽  
Free Space Communication

Identification of independent modes in two inputs free space communications system

2021 ◽  
Vol 136 ◽  
pp. 106320
Author(s):  
Eugen Scarlat ◽  
Mona Mihăilescu ◽  
Irina Alexandra Păun
Keyword(s):  
Free Space ◽  
Space Communications ◽  
Communications System

Graphene-Based Tunable Polarization Insensitive Dual-Band Metamaterial Absorber at Mid-Infrared Frequencies

2015 ◽  
Vol 32 (6) ◽  
pp. 068101 ◽  
Author(s):  
Yu-Ping Zhang ◽  
Tong-Tong Li ◽  
Huan-Huan Lv ◽  
Xiao-Yan Huang ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Mid Infrared ◽  
Polarization Insensitive ◽  
Infrared Frequencies
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