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- Akram, Nadeem, et al.
(författare)
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Design optimization of InGaAsP-InGaAlAs 1.55 mu;m strain-compensated MQW lasers for direct modulation applications
- 2004
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Ingår i: Indium Phosphide and Related Materials, 2004. 16th IPRM. 2004 International Conference on. - : IEEE. - 0780385950 ; , s. 418-421
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Konferensbidrag (refereegranskat)abstract
- A comprehensive simulation study of InGaAsP (well)/InGaAlAs(barrier) 1.55 mu;m strain-compensated MQW lasers is presented. For MQWs, a uniform vertical distribution of holes is achieved due to a reduced effective hole confinement energy by optimizing the bandgap and strain of the barriers and p-doping in the active region. Some preliminary results are also presented for the manufactured lasers using these QWs indicating a good material platform.
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| 5. |
- Akram, Nadeem, 1971-, et al.
(författare)
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Experimental characterization of high-speed 1.55 mu m buried heterostructure InGaAsP/InGaAlAs quantum-well lasers
- 2009
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Ingår i: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 26:2, s. 318-327
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Tidskriftsartikel (refereegranskat)abstract
- Detailed experimental characterization is performed for 1550 nm semi-insulating regrown buried heterostructure Fabry-Perot (FP) lasers having 20 InGaAsP/InGaAlAs strain-balanced quantum wells (QWs) in the active region. Light-current-voltage performance, electrical impedance, small-signal response below and above threshold, amplified spontaneous emission spectrum below threshold and relative intensity noise spectrum are measured. Different laser parameters such as external differential quantum efficiency eta(d), background optical loss alpha(i), K-factor, D-factor, characteristic temperature T-0, differential gain dg/dn, gain-compression factor epsilon, carrier density versus current, differential carrier lifetime tau(d), optical gain spectrum below threshold, and chirp parameter alpha are extracted from these measurements. The FP lasers exhibited a high T-0 (78-86.5 degrees C) and very high-resonance frequency (23.7 GHz). The results indicate that appropriately designed lasers having a large number of InGaAsP well/InGaAlAs barrier QWs with shallow valence-band discontinuity can be useful for un-cooled high-speed direct-modulated laser applications.
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- Akram, Nadeem, 1971-, et al.
(författare)
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High-Speed Performance of 1.55 µm Buried Hetero-Structure Lasers with 20 InGaAsP/InGaAlAs Quantum-Wells
- 2006
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Ingår i: 2006 European Conference on Optical Communications Proceedings, ECOC 2006. - : IEEE. - 9782912328397 ; , s. 1-2
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Konferensbidrag (refereegranskat)abstract
- 1550 nm re-grown FP lasers having 20 InGaAsP/InGaAlAs strain-balanced QWs exhibit low threshold current density, high T0 (78.0 #x000B0;C) and high resonance frequency (24 GHz) indicating that a large number of shallow barrier QWs are attractive for un-cooled high-speed direct-modulation applications.
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- Isaksson, M., et al.
(författare)
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10 Gb/s direct modulation of 40 nm tunable modulated-grating Y-branch laser
- 2005
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Ingår i: Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC. - 1557527830 - 9781557527837 ; , s. 117-119
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Konferensbidrag (refereegranskat)abstract
- High speed properties of a directly modulated widely tunable MG-Y laser have been evaluated. Small signal response and 10 Gb/s NRZ modulation were performed within the 40 nm tuning range.
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- Kjebon, Olle, 1960-, et al.
(författare)
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Modulation response measurements and evaluation of MQW InGaAsP lasers of various designs
- 1996
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Ingår i: Proc. SPIE, Vol. 2684. - : SPIE. ; , s. 138-152
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Resultsfrom modulation measurements of 40 high-speed multi quantum well (MQW)lasers ((lambda) equals 1.55 micrometer) of various designs are presented.By fitting the careful calibrated measurements, both magnitude and phase,to an analytical transfer function we were able to determineif a certain laser was limited by thermal effects, parasitic-likeeffects, or nonlinear gain effects. We found that most ofthe devices in the study were limited by thermal effectsand/or contact parasitics. The parasitics were found to be determinedby the width of the high-doped contact layer and claddinglayers below the metallic contact. It was also found thata high doping of the separate confinement heterostructure (SCH) layersdecreases the damping of the relaxation peak since it facilitatesthe carrier transport. Improved contact design and high doped SCH-layersresulted in modulation bandwidths of around 24 GHz.
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- Kjebon, Olle, 1960-, et al.
(författare)
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Transmission at 20 Gb/s with directly modulated DBR lasers over 30 km standard fiber
- 2002
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Ingår i: Optical Communication, 2002. ECOC 2002. 28th European Conference on. ; , s. 1-2
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Konferensbidrag (refereegranskat)abstract
- Transmission of 20 Gb/s NRZ over 30 km of standard fiber was accomplished with directly modulated DBR lasers at 1.55 mum. Experiments were performed without dispersion compensation and optical amplification and a negative penalty was observed
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