High performance BH InAs/InP QD and InGaAsP/InP QW mode-locked lasers as comb and pulse sources

Zander, Marlene; Rehbein, W.; Moehrle, Martin G.; Breuer, Stefan; Franke, D.; Schell, Martin; Kolpatzeck, Kevin; Balzer, Jan C.

doi:10.1364/ofc.2020.t3c.4

Cited by 15 publications

(3 citation statements)

References 1 publication

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“…In PML operation mode, the data shown in Figure 4a was measured at a temperature of 15°C, a gain current of 381 mA and an absorber voltage of -0.2 V. The FWHM of the measured autocorrelation trace is 690 fs with a fiber length of 69 m. This result in PML operational mode confirms measurements that have already been carried out on these lasers. Here, comparable spectra and autocorrelation traces were measured at the same or close operating point, with a fiber length of 71 m. 10,11 In SML operation mode, the following operating point was approached, illustrated in Figure 4b: a temperature of 16°C and a gain curent at 366 mA. A total fiber length of 74 m was implemented into the setup.…”

Section: Qd Lasermentioning

confidence: 99%

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Kleemann,

Surkamp,

Scherer

et al. 2024

Novel in-Plane Semiconductor Lasers XXIII

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In this study, we conduct a comparative analysis of an InAs/InP quantum dot diode laser and an InGaAsP/InP quantum well laser. Both lasers are monolithic, 840 µm long devices. They have a two-part buried heterostructure with 10%/90% reflection coated facets and emit at 1550 nm (quantum dot laser) respectively 1570 nm (quantum well laser). In passive mode-locking operational mode, the larger section of both devices is continuously pumped with forward current, while the second, smaller section (50 µm) is operated with reverse absorber voltage. In self mode-locking operation both sections of the laser are connected and pumped with forward current. Femtosecond pulses have been detected in both operational modes.

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Section: Qd Lasermentioning

confidence: 99%

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Kleemann,

Surkamp,

Scherer

et al. 2024

Novel in-Plane Semiconductor Lasers XXIII

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show abstract

“…A small feature width leads to a long coherence length and hence a larger FWHM. The extreme case is a mode-locked laser with an optical mode width on the order of a few MHz [18], which leads to a terahertz pulse train with constant amplitudes [19]. Further, it helps to understand why a smaller feature width increases the DR even if the ∆pp is reduced: within the broader envelope more pulses are included.…”

Section: Analysis and Comparison Of Structured Spectra To Continouus ...mentioning

confidence: 99%

Spectral Shaping of a Superluminescent Diode for Terahertz Cross-Correlation Spectroscopy

et al. 2022

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After 20 years of terahertz cross-correlation spectroscopy (THz-CCS), the performance of the systems has been improved to practical relevance by reaching a bandwidth of ~2 THz. For the development of high-performance THz-CCS systems, it is necessary to get a deeper knowledge of the signal generation from incoherent light sources. In this work, the bandwidth, dynamic range, and peak-to-peak amplitude of a THz-CCS systems using a superluminescent diode as light source and a programmable optical filter for spectral shaping was investigated to obtain a better understanding of the relationship between the optical spectrum and the generated terahertz spectrum. By a periodic structuring of the continuous optical spectrum, an enhancement of the peak dynamic range of more than 10 dB was achieved with a bandwidth of 1.6 THz. The experimental results are confirmed by numerical simulations.

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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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High performance BH InAs/InP QD and InGaAsP/InP QW mode-locked lasers as comb and pulse sources

Cited by 15 publications

References 1 publication

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Spectral Shaping of a Superluminescent Diode for Terahertz Cross-Correlation Spectroscopy

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

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