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- W2189168465 abstract "First monolithically integrated ridge-waveguide InAs/InGaAs quantum-dot ringlasers arefabricated andcharacterized. Enhanced byaforward biased S-section waveguide, stable traveling-wave (unidirectional) operation withrecord suppression ratio ofcounterpropagating wavesapproaching 30dBisdemonstrated. ©2005Optical Society ofAmerica OCIScodes: (140.3560) Lasers, ring; (140.5960) Semiconductor lasers Semiconductor ringlasers (SRLs) areattractive aslight sources foroptoelectronic integrated circuits (OEICs), ultrashort pulse generation, androtation sensing. Forthelatter application, large-size rings aredesirable inorder to enhance theSagnac frequency shift. Quantum-dot (QD)-based active regions areanatural choice forlarge-size SRLs, because ofdemonstrated lowthreshold current densities (24A/cm2) andlowinternal losses (0.77 cm-') in edge-emitting lasers (1). Inthis work, weusea6-stack dots-in-a-well (DWELL)QD structure (2),(3) for fabrication ofSRLsmonolithically integrated withpassive waveguides andwith photodiodes forthefirst time. We demonstrate SRLswiththelowest reported threshold current density, anda record-high suppression of counterpropagating waves, improving byabout afactor of10overtheprevious result obtained using quantum-well (QW)-based SRLs(4). DWELL-type QD wafers arefabricated byMBE (2). InAsQDsareembedded inside strained InGaAs QWs withGaAsbarriers. Thetotal thickness oftheQD active region is137nm.Waferprocessing includes several steps withdifferent photolithographic" @default.
- W2189168465 created "2016-06-24" @default.
- W2189168465 creator A5018320991 @default.
- W2189168465 creator A5054198975 @default.
- W2189168465 date "2005-01-01" @default.
- W2189168465 modified "2023-09-24" @default.
- W2189168465 title "Unidirectional Operation ofQuantum-Dot RingLasers" @default.
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