InAs/InP QD and InGaAsP/InP QW comb lasers for $&gt; 1$ Tb/s transmission

Zander, Marlene; Rehbein, W.; Möhrle, Martin G.; Breuer, Steffen; Franke, D.; Bimberg, D.

doi:10.1109/iciprm.2019.8818995

Cited by 3 publications

(2 citation statements)

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“…The MLLDs used in this work are InAs/InP QD and InGaAsP/InP QW introduced by Zander et al 41 . In a previously published work 42 we have investigated the stability of these MLLDs at different points of operations.…”

Section: Laser Diodesmentioning

confidence: 99%

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

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Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include – among others – imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect.To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak dynamic range of 133 dB after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

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Section: Laser Diodesmentioning

confidence: 99%

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

View full text Add to dashboard Cite

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“…This approach has first been demonstrated by Merghem et al [ 19 ] and system-theoretically analyzed by the authors [ 20 ]. Besides its suitability for photonic beam steering, UHRR THz TDS has the advantage that the light source has the potential for monolithic integration, is electrically pumped, supplies an optical power of around 100 mW without amplification, and operates at 1550 nm telecom wavelengths [ 21 , 22 ]. Another practical advantage of the ultra-high repetition rate is the fact that identical pulses are detected every few picoseconds.…”

Section: Introductionmentioning

confidence: 99%

Wideband Beam Steering Concept for Terahertz Time-Domain Spectroscopy: Theoretical Considerations

Kolpatzeck

Haring

et al. 2020

Sensors

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Photonic true time delay beam steering on the transmitter side of terahertz time-domain spectroscopy (THz TDS) systems requires many wideband variable optical delay elements and an array of coherently driven emitters operating over a huge bandwidth. We propose driving the THz TDS system with a monolithic mode-locked laser diode (MLLD). This allows us to use integrated optical ring resonators (ORRs) whose periodic group delay spectra are aligned with the spectrum of the MLLD as variable optical delay elements. We show by simulation that a tuning range equal to one round-trip time of the MLLD is sufficient for beam steering to any elevation angle and that the loss introduced by the ORR is less than 0.1 dB. We find that the free spectral ranges (FSRs) of the ORR and the MLLD need to be matched to 0.01 % so that the pulse is not significantly broadened by third-order dispersion. Furthermore, the MLLD needs to be frequency-stabilized to about 100 MHz to prevent significant phase errors in the terahertz signal. We compare different element distributions for the array and show that a distribution according to a Golomb ruler offers both reasonable directivity and no grating lobes from 50 GHz to 1 THz.

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Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Cherniak,

Kubiczek,

Kolpatzeck

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include—among others—imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect. To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak signal-to-noise ratio of 133 dB at 100 GHz after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

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InAs/InP QD and InGaAsP/InP QW comb lasers for $> 1$ Tb/s transmission

Cited by 3 publications

References 0 publications

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Wideband Beam Steering Concept for Terahertz Time-Domain Spectroscopy: Theoretical Considerations

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

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