Terahertz waveguide multiplexers: A review

Abstract

Terahertz (THz) band, which owns abundant and underexplored frequency spectrum, has provided rich scientific and technological opportunities in numerous research fields, such as radio astronomy, atmospheric science and high-speed communication. As one of the key components in THz systems, the multiplexer cannot only separate/combine different bands, but can also

Integrated Wideband Multiplexer Design for Multiple-Use SATCOM/Terrestrial Terminals

“…Although manifold-style multiplexers have been well defined in the literature ( [6], [7], [8], [9], [10], [11], [12]) for both star-and manifold-coupled designs, the vast majority of designs are contrived for tightly-spaced narrowband channel selection and utilize a manifold coupling scheme to allow for the additional degree of freedom provided between each contiguous filter branch. Work in this field has spanned all the way to the terahertz region and across many technology platforms (e.g., [13], [14], [15]. However, on the consideration of wideband channels, it is common to see configurations that utilize lowpass filter techniques to allow for a wide lowpass response while the upper-ranged filter response is provided by a single bandpass or highpass filter [16], [17], [18]; in this scheme, the device often becomes limited to operate as a diplexer due to the frequency region of interest being covered by the combination of lowpass/highpass responses.…”

Broadband Terahertz Near-Field Excitation and Detection of Silicon Photonic Crystal Modes

“…As a result, much effort has been directed toward the development of increasingly efficient, compact, and reliable terahertz interconnect solutions. 10,11 In the context of free-space communication, terahertz radiation uniquely provides a bridge between optics and electronics, 12 sharing the advantages of both IR waves (high directivity, large bandwidth) and microwaves (reduced diffraction). However, the strong dependence on atmospheric conditions, 13 the large absorption of water and vapor, 14 signal interference, 15 the loss of the long-range free space path, 16 and the need for precise alignment between the source and receiver 17 limit the practicality of THz wireless links.…”

“…Recent years have witnessed a surge in interest in terahertz technologies that may serve the imminent rollout of 6G telecommunication networks with terabits/s data rates, which will be essential for providing a reliable communication backbone for several emerging technologies and systems, such as interconnected vehicles, augmented and virtual reality, and artificial intelligence. As a result, much effort has been directed toward the development of increasingly efficient, compact, and reliable terahertz interconnect solutions. , …”