Abstract-Ultralow loss graphene-based hybrid plasmonic waveguide with deep-subwavelength confinement

Xueqing He, Tigang Ning, Shaohua Lu, Jingjing Zheng, Jing Li, Rujiang Li, and Li Pei

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-8-10109

In this paper, we theoretically propose a novel graphene-based hybrid plasmonic waveguide (GHPW) consisting of a low-index rectangle waveguide between a high-index cylindrical dielectric waveguide and the substrate with coated graphene on the surface. The geometric dependence of the mode characteristics on the proposed structure is analyzed in detail, showing that the proposed GHPW has a low loss and consequently a relatively long propagation distance. For TM polarization, highly confined modes guided in the low-index gap region between the graphene and the high-index GaAs and the normalized modal area is as small as 0.0018 (λ2/4) at 3 THz. In addition to enabling the building of high-density integration of the proposed structure are examined by analyzing crosstalk in a directional coupler composed of two GHPWs. This structure also exhibits ultra-low crosstalk when a center-to-center separation between adjacent GHPWs is 32μm, which shows great promise for constructing various terahertz integrated devices.

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Abstract-Millimeter- and terahertz-waves generation with photonic frequency 32-tupling based on tunable lasers

Hongyao Chen, Tigang Ning, Jing Li, Wei Jian, Li Pei, Chao Li, Jingjing Zheng,Chuanbiao Zhang

Beijing Jiaotong University, Institute of Lightwave Technology, Key Lab of All Optical Network and Advanced Telecommunication Network of EMC, Beijing 100044, China

Opt. Eng. 54(2), 026106 (Feb 23, 2015). doi:10.1117/1.OE.54.2.026106

http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=2173749

We propose and analyze a frequency 32-tupling scheme which is capable of generating millimeter and terahertz waves without being affected by the phase noise difference between two incoherent sources. In our work, the process of the optical sidebands’ phase noise change is theoretically analyzed and confirmed by simulations. In addition, the system performance in terms of linewidth, tunability, and stability is also investigated.

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Abstract-Frequency-reconfigurable terahertz wireless transmission using an optical frequency comb based on radio-over-fiber technology

Chan Zhang

Beijing Jiaotong University, Institute of Lightwave Technology, Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Beijing, 100044, China

Tigang Ning, Jing Li, Chao Li, Shaoshuo Ma

Beijing Jiaotong University, Institute of Lightwave Technology, Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Beijing, 100044, China

Opt. Eng. 53(12), 126111 (Dec 19, 2014). doi:10.1117/1.OE.53.12.126111

History: Received July 25, 2014; Accepted November 24, 2014

http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=2086715&resultClick=1

Abstract.  We propose a prototype for frequency-reconfigurable terahertz (THz) wireless transmission using an optical comb based on radio-over-fiber technology. In the proposal, an electro-absorption modulator (EAM) followed by a phase modulator and an intensity modulator are used to generate a flat optical comb with a tunable frequency spacing. Then, a different THz signal can be generated by photo-mixing of optical two-tone signals from the comb lines. In the scheme, we obtain 46 comb lines within a 1-dB power deviation with an interval of about 10 GHz, and a THz up to 440 GHz is obtained. Moreover, a much higher bandwidth can be easily reached by adjusting the driving signal of the EAM. The feasibility and tunability of the proposed scheme are confirmed by the simulations. This method shows a simple cost-efficient configuration and good performance over long-distance delivery.