scholarly journals Эффект насыщающегося поглотителя в длинноволновых вертикально-излучающих лазерах, реализованных по технологии спекания

2020 ◽  
Vol 46 (24) ◽  
pp. 49
Author(s):  
С.А. Блохин ◽  
М.А. Бобров ◽  
А.А. Блохин ◽  
А.П. Васильев ◽  
А.Г. Кузьменков ◽  
...  
Keyword(s):  
Optical Power ◽  
Single Mode ◽  
Threshold Current ◽  
Lasing Threshold ◽  
Cavity Surface ◽  
Lateral Direction ◽  
Vertical Cavity Surface ◽  
Current Confinement ◽  
Emitting Lasers ◽  
Height Step

Vertical-cavity surface-emitting lasers emitting at the spectral range of 1.55 µm based on heterostructures with a buried tunnel junction (BTJ) with a height step of 15 nm are studied. The devices are realized using wafer fusion technique of heterostructures grown by molecular beam epitaxy and demonstrate a single-mode lasing regime at the 8 μm BTJ-diameter. With a decrease in the BTJ-diameter, a sharp increase in the threshold current, accompanied by an abrupt increase in the output optical power and resonance frequency at the lasing threshold are observed. Stable single-mode lasing is due to the smoothing of the boundary of the overgrown surface relief, which leads to a smooth change in the profile of the effective refractive index in the lateral direction, while maintaining effective current confinement, which makes it possible to significantly reduce the transverse optical confinement factor for high-order modes even at large BTJ-diameter. However, at small BTJ-diameter, it also leads to the formation of a saturable absorber in the non-pumped parts of the active region.

Optical Power Optimization of the Single Mode Vertical Cavity Surface Emitting Lasers by Two Oxide Layers

2011 ◽  
Vol 383-390 ◽  
pp. 6283-6288 ◽  
Author(s):  
Mohamad Yazdanypoor ◽  
Asghar Gholami
Keyword(s):  
Output Power ◽  
Optical Power ◽  
Single Mode ◽  
Threshold Current ◽  
Cavity Surface ◽  
Oxide Layers ◽  
High Frequency Response ◽  
Vertical Cavity Surface ◽  
Emitting Lasers ◽  
Vertical Cavity

Influence of using two oxide layers in the both sides of active layer with different position and aperture size on Vertical Cavity Surface Emitting Laser (VCSEL) performance is analyzed showing effects on the output power, single mode operation and threshold current. In addition, for improving speed we use ion implant area along with thick oxide layer to minimize parasitic elements. As the result, the proposed design exhibits much better stability of the fundamental mode over a wider current range, much higher output power, lower threshold current, than the conventional one with a high frequency response.

Single-mode low threshold current multi-hole vertical-cavity surface-emitting lasers

2012 ◽  
Vol 21 (3) ◽  
pp. 034206 ◽  
Author(s):  
Zhen-Bo Zhao ◽  
Chen Xu ◽  
Yi-Yang Xie ◽  
Kang Zhou ◽  
Fa Liu ◽  
...  
Keyword(s):  
Single Mode ◽  
Threshold Current ◽  
Cavity Surface ◽  
Surface Emitting Lasers ◽  
Vertical Cavity Surface ◽  
Low Threshold ◽  
Emitting Lasers ◽  
Vertical Cavity

scholarly journals A simple and precise method for the threshold current determination in vertical-cavity surface-emitting lasers

2020 ◽  
Vol 50 (2) ◽  
Author(s):  
Emilia Pruszyńska-Karbownik ◽  
Marcin Gębski ◽  
Magdalena Marciniak ◽  
James A. Lott ◽  
Tomasz Czyszanowski
Keyword(s):  
Spontaneous Emission ◽  
Threshold Current ◽  
Stimulated Emission ◽  
Cavity Surface ◽  
Surface Emitting Lasers ◽  
Current Curve ◽  
Vertical Cavity Surface ◽  
Current Confinement ◽  
Emitting Lasers ◽  
Vertical Cavity

In this paper, we present experimental results of spontaneous emission clamping in the threshold for vertical-cavity surface-emitting lasers (VCSELs) with oxide current confinement. We show that the spontaneous emission not wholly clamps in the threshold. We propose a new method for determining the threshold current value using the study of the clamping phenomena. This method has an advantage over the commonly used methods in the accuracy because the current of the spontaneous emission clamping is betted defined than the current of the slope change of the stimulated emission light-current curve. The estimated uncertainty of the method is no more than 20 µA.

scholarly journals Hexagonal transverse-coupled-cavity VCSEL redefining the high-speed lasers

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4743-4748
Author(s):  
Elham Heidari ◽  
Hamed Dalir ◽  
Moustafa Ahmed ◽  
Volker J. Sorger ◽  
Ray T. Chen
Keyword(s):  
High Speed ◽  
Single Mode ◽  
Cavity Surface ◽  
Surface Emitting Lasers ◽  
Vertical Cavity Surface ◽  
Emitting Lasers ◽  
Injection Currents ◽  
Vertical Cavity ◽  
Coupled Cavity ◽  
Modulation Speed

AbstractVertical-cavity surface-emitting lasers (VCSELs) have emerged as a vital approach for realizing energy-efficient and high-speed optical interconnects in the data centers and supercomputers. Indeed, VCSELs are the most suitable mass production lasers in terms of cost-effectiveness and reliability. However, there are still key challenges that prevent achieving modulation speeds beyond 30s GHz. Here, we propose a novel VCSEL design of a hexagonal transverse-coupled-cavity adiabatically coupled through a central cavity. Following this scheme, we show a prototype demonstrating a 3-dB roll-off modulation bandwidth of 45 GHz, which is five times greater than a conventional VCSEL fabricated on the same epiwafer structure. This design harnesses the Vernier effect to increase the laser’s aperture and therefore is capable of maintaining single-mode operation of the laser for high injection currents, hence extending the dynamic roll-off point and offering increases power output. Simultaneously, extending both the laser modulation speed and output power for this heavily deployed class of lasers opens up new opportunities and fields of use ranging from data-comm to sensing, automotive, and photonic artificial intelligence systems.

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