Rf-modulation of mid-infrared distributed feedback quantum cascade lasers

被引：50

作者：

Hinkov, Borislav ^{[1
]}

Hugi, Andreas ^{[1
]}

Beck, Mattias ^{[1
]}

Faist, Jerome ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Inst Quantum Elect, Auguste Piccard Hof 1, CH-8093 Zurich, Switzerland

来源：

OPTICS EXPRESS | 2016年 / 24卷 / 04期

关键词：

HIGH-FREQUENCY MODULATION; SPECTROSCOPY; LOCKING;

D O I：

10.1364/OE.24.003294

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present the electrical and optical characterization and theoretical modeling of the transient behavior of regular 4.5-mu m single-mode emitting distributed feedback (DFB) quantum cascade lasers (QCLs). Low residual capacitance together with a high-frequency optimized three-terminal coplanar waveguide configuration leads to modulation frequencies up to 23.5 GHz (optical) and 26.5 GHz (electrical), respectively. A maximum 3-dB cut-off value of 6.6 GHz in a microwave rectification scheme is obtained, with a significant increase in electrical modulation bandwidth when increasing the DC-current for the entire current range of the devices. Optical measurements by means of FTIR-spectroscopy and a heterodyne beating experiment reveal the presence of a resonance peak, due to coupling of the lasing DFB-with its neighboring below-threshold Fabry-Perot-(FP-) mode, when modulating around the cavity roundtrip frequency. This resonance is modeled by a 2-mode Maxwell-Bloch formalism. It enhances only one sideband and consequently leads to the first experimental observation of the single-sideband regime in such kind of devices. (C) 2016 Optical Society of America

引用

页码：3294 / 3312

页数：19

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