A dual-mode quantum dot laser operating in the excited state

Abstract

International audienceA dual-mode laser operating in the excited states (ESs) of a quantum dot is realized by combining asymmetric pumping and external optical feedback stabilization. In generating two single-mode emission peaks, a mode separation ranging from 1.3-THz to 3.6-THz is demonstrated over temperature. This effect is attributed to the unique carrier dynamics of the quantum-dot gain medium via the excited state inhomogeneous linewidth coupled with a proper external control. These results are particularly important towards the development of future THz optoelectronic sources with compact size, low fabrication cost, and high performance

Multimode optical feedback dynamics of InAs/GaAs quantum-dot lasers emitting on different lasing states

“…13,22 Lastly, various studies have investigated the two-state lasing dynamics where ES and GS lasing can take place simultaneously either with or without external optical feedback. 21,[23][24][25] In particular, it was recently unveiled that the two-state lasing can produce a large GS modulation enhancement. [26][27][28] In order to further evaluate the potential impact of such lasers in the view of their inclusions into a fiber-pigtailed telecom module, this work aims at characterizing the long-delay optical feedback dynamics of InAs/GaAs QD Fabry-Perot (FP) lasers emitting either on the sole GS or exclusively on the ES.…”

“…The optical feedback dynamics of the GS laser are first investigated. While bias conditions of 1.5×, 2.5× and 3×I th (25,33 and 50 mA resp.) were considered, the GS laser remains stable for the whole range of currents and feedback strengths studied, only a small red-shift of the FP modes was observed with no sign of spectral broadening.…”

Optical bistability in side-mode injection locked dual-mode Fabry-Pérot laser diode

“…18 To date, many techniques have been proposed and experimentally demonstrated to successfully produce dual-mode lasing operation, [19][20][21][22][23][24] and among these, multi-mode Fabry-Pérot laser diode (MMFP-LD) based devices are worthy of extensive investigation because of their rich variety of nonlinear phenomena, cost effectiveness, low power consumption and low threshold current. [25][26][27] In general, the MMFP-LDs associated with external cavity feedback and incorporating fiber Bragg gratings and tunable filters were often chosen for selection of special feedback wavelengths that are then fed back into the active region to produce dual-mode laser oscillation in the output spectrum.…”

Dual-mode lasing in a 1310-nm quantum dot distributed feedback laser induced by single-beam optical injection

“…5 Optical feedback and temperature control were identified as additional techniques for tuning the frequency difference. 6 These results were enabled through the unique nature of the QD media. In this work, we report dual-mode lasing operation in a QD distributed-feedback (DFB) laser induced by single-beam optical injection into one of the residual FP modes of the device.…”

“…Previous dual-mode QD lasers consisted of a split-anode geometry that enabled asymmetric pumping to balance the emission between one mode that was coupled to a Bragg grating and the other to the Fabry-Perot (FP) cavity. 5,6 Simultaneous ground state-excited state and excited state-excited state emission were demonstrated with mode frequency differences varying from 1.3 to 8 THz. 5 Optical feedback and temperature control were identified as additional techniques for tuning the frequency difference.…”