Terahertz Time-Domain Spectroscopy by Asynchronous Sampling with Modelocked Semiconductor Lasers

Surkamp, Nils; Döpke, Benjamin; Hu, Yuze; Brenner, Carsten; Hofmann, Martin R.; Klehr, A.; Knigge, Andrea; Tränkle, G.

doi:10.1109/iwmts.2018.8454698

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…The presented DRO is intended as time base for THz-TDS based on mode-locked laser diodes at a pulse repetition rate at around 12.8 GHz. A proof of concept is demonstrated in [15]. The time base's jitter must be negligible compared to the laser diode's pulse width for appropriate measurements.…”

Section: Realized Setupmentioning

confidence: 99%

A Tunable Dielectric Resonator Oscillator with Phase-Locked Loop Stabilization for THz Time Domain Spectroscopy Systems

Kaesbach

Delden

Musch

2023

IEICE Trans. Electron.

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Precision microwave measurement systems require highly stable oscillators with both excellent long-term and short-term stability. Compared to components used in laboratory instruments, dielectric resonator oscillators (DRO) offer low phase noise with greatly reduced mechanical complexity. To further enhance performance, phase-locked loop (PLL) stabilization can be used to eliminate drift and provide precise frequency control. In this work, the design of a low-cost DRO concept is presented and its performance is evaluated through simulations and measurements. An open-loop phase noise of −107.2 dBc/Hz at 10 kHz offset frequency and 12.8 GHz output frequency is demonstrated. Drift and phase noise are reduced by a PLL, so that a very low jitter of under 29.6 fs is achieved over the entire operating bandwidth.

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Section: Realized Setupmentioning

confidence: 99%

A Tunable Dielectric Resonator Oscillator with Phase-Locked Loop Stabilization for THz Time Domain Spectroscopy Systems

Kaesbach

Delden

Musch

2023

IEICE Trans. Electron.

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“…(c) The conversion gain (G mix ) and DSB noise temperature (T mix ) of 220 GHz sub-harmonic mixer operating at f RF and f LO are calculated by formulas (9) and (10).…”

Section: B the Dsb Noise Temperature Of Mixermentioning

confidence: 99%

“…T mix = T rec − T IF G mix (10) Through the iterative calculation of the above steps, the measured system and the mixer DSB noise temperature using Y-Factor method are finally obtained in the LO power range, operating at IF frequencies, as shown in Fig. 19.…”

Section: B the Dsb Noise Temperature Of Mixermentioning

confidence: 99%

“…In the 1980s, international research institutes such as Jet Propulsion Laboratory, Virginia Diodes, Inc., European Space Agency, Japan Aerospace Exploration Agency and universities have carried out research on terahertz solid-state circuit technology. Terahertz technology has been widely applied in many fields such as remote sensing of the earth atmosphere [1], exploration of the aerospace [2], biomedical care [3], military security [4], wireless high speed communications [5], and so on [6]- [10]. The terahertz transceiver front-ends have become a research hotspot in many fields.…”

Section: Introductionmentioning

confidence: 99%

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A 220 GHz Broadband Sub-Harmonic Mixer Based on Global Design Method

et al. 2019

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A terahertz mixer is one of terahertz key components and widely used on terahertz wireless communication, remote sensing, aerospace exploration, and biomedical system. The performance of the terahertz mixer has a great effect on the entire terahertz transceiver system performance. This paper proposes a 220 GHz broadband sub-harmonic mixer based on global design method (GDM), which is different from the traditional subdivision design method of which the mixer circuit is composed of functional unit circuits. Instead, the GDM adopts the overall performance of the mixer (conversion loss) as an optimization goal. The continuous structures of the circuit are described by ideal transmission line models and waveguide models, meanwhile, the S-parameters of the de-embedded model are used to describe the discontinuous structures. The measured single-sideband (SSB) conversion loss is basically consistent with the simulation results, which verifies the accuracy and reliability of the GDM. When local oscillator (LO) frequency is fixed at 110 GHz, the measured SSB conversion loss is less than 10 dB with the average value of 8.1 dB from 198 to 238 GHz. The minimum conversion loss of the mixer is 6.35 dB at 207 GHz. The measured double-sideband noise temperature of the mixer is less than 924 K at an intermediate frequency of 1.6 GHz. The GDM has the characteristics with a wide frequency band, small circuit size, simple structure, low LO power, and stable performance, and can also be applied to other terahertz components. INDEX TERMS Terahertz components, terahertz sub-harmonic mixer, subdivision design method, global design method.

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Design and analysis of a 1 × 2 microstrip patch antenna array based on photonic crystals with a graphene load in THZ

Benlakehal

Hocini

Khedrouche

et al. 2022

J Opt

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Terahertz Time-Domain Spectroscopy by Asynchronous Sampling with Modelocked Semiconductor Lasers

Cited by 6 publications

References 9 publications

A Tunable Dielectric Resonator Oscillator with Phase-Locked Loop Stabilization for THz Time Domain Spectroscopy Systems

A Tunable Dielectric Resonator Oscillator with Phase-Locked Loop Stabilization for THz Time Domain Spectroscopy Systems

A 220 GHz Broadband Sub-Harmonic Mixer Based on Global Design Method

Design and analysis of a 1 × 2 microstrip patch antenna array based on photonic crystals with a graphene load in THZ

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