Silicon Dielectric Diplexer Module for 600-GHz-Band Frequency-Division Multiplexing Wireless Communication

Abstract

We developed a silicon (Si) dielectric diplexer module for 600-GHz-band frequency-division multiplexing wireless communication. This diplexer was developed based on Si dielectric waveguide technology, which provides low-loss transmission characteristics compared with the conventional metallic terahertztransmission platform, such as metallic hollow waveguides. It includes straight waveguides based on an effective medium composed of Si and air, and a coupler comprising of two adjacent unclad Si waveguides. Furthermore, for the communication system integration, we developed a practical and low-insertion loss module with WR1.5 metallic hollow waveguide input-output interfaces and modularized the diplexer. We performed transmission measurement experiments with the fabricated diplexer module and achieved 3-dB bandwidths of 101 and 37 GHz, and crosstalk of −34 dB at 680 GHz and −41 dB at 618 GHz in the cross and bar directions, respectively. Finally, we performed a two-channel wireless communication experiment using the developed diplexer module in the 600-GHz band. We achieved error-free communication at 10 and 6 Gbit/s on the cross and bar channels, respectively. In addition, we achieved a data rate of up to 12.5 Gbit/s at the forward error correction limits for both channels.

Terahertz waveguide multiplexers: A review

“…(A) Functional diagram and layouts of the diplexer, 37 (B) overview of the fabricated Si‐dielectric diplexer and simulated electric‐field intensity distribution at 618 and 680 GHz, 38 as well as (C) structure diagram of THz ridge waveguide diplexer 39 …”

“…This review article focuses on discussing the state‐of‐the‐art THz waveguide multiplexers. They are classified based on principle configurations, such as the hybrid‐coupled, manifold‐coupled and other typed ones 12,28–39 …”

300-GHz-Band Diplexer for Frequency-Division Multiplexed Wireless Communication

“…3(a). We employ an evanescent directional coupler formed of a pair of unclad silicon wires separated by a micro-scale air gap [4,6,8]. Low frequencies are transferred across the airgap more quickly, while high frequencies mainly remain the original waveguide.…”

“…In this context, THz communication systems using silicon dielectric waveguides have been reported in recent years [5,6]. With the aim of utilizing the wide bandwidth efficiently, we have previously investigated frequency-division multiplexing (FDM) using a silicon diplexer [4], [6]- [8] and a multiplexer [9]. In the cited work [8], we developed a 600-GHz-band unclad silicon diplexer and achieved a 16-Gbit/s error-free two-channel wireless transmission.…”

“…With the aim of utilizing the wide bandwidth efficiently, we have previously investigated frequency-division multiplexing (FDM) using a silicon diplexer [4], [6]- [8] and a multiplexer [9]. In the cited work [8], we developed a 600-GHz-band unclad silicon diplexer and achieved a 16-Gbit/s error-free two-channel wireless transmission. One of the obstacles to a higher data rate is considered to be crosstalk, which negatively impacts channel quality.…”