Optical characterization of an asymmetric quantum well structure for broadband laser array application

Research output: Contribution to journalArticle

Abstract

Distributed feedback (DFB) lasers based on AlGaInAs asymmetric quantum wells (AQWs) have been designed and fabricated. The active region comprises of three 6.4nm and six 5nm wells, with +1.3448% compressive strain in quantum wells and 0:7379% tensile strain in barriers. Material quality was characterized by photoluminescence (PL) and photorefletance (PR) investigation. Broadband characteristic was confirmed by a 98 nm wide room temperature PL spectrum centering at 1520 nm. The details of transition energies and their associated quantized energy levels in both types of wells were studied by PR measurement and the results were compared with numerical simulation results and PL spectra. DFB lasers worked in the wavelength range from 1502.8 to 1535.2 nm. Although channels at longer wavelength failed due to process defect in grating, numerical simulation and laser performance analyses indicated that the modal gain of the channel at 1532.2nm was supported by wide wells.

Original languageEnglish
Article number04DG16
JournalJapanese Journal of Applied Physics
Volume50
Issue number4 PART 2
DOIs
Publication statusPublished - 2011 Apr 1

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laser arrays
Semiconductor quantum wells
Photoluminescence
Distributed feedback lasers
quantum wells
distributed feedback lasers
broadband
photoluminescence
Lasers
Wavelength
Tensile strain
Computer simulation
Electron transitions
wavelengths
Electron energy levels
simulation
energy levels
gratings
Defects
defects

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "Distributed feedback (DFB) lasers based on AlGaInAs asymmetric quantum wells (AQWs) have been designed and fabricated. The active region comprises of three 6.4nm and six 5nm wells, with +1.3448{\%} compressive strain in quantum wells and 0:7379{\%} tensile strain in barriers. Material quality was characterized by photoluminescence (PL) and photorefletance (PR) investigation. Broadband characteristic was confirmed by a 98 nm wide room temperature PL spectrum centering at 1520 nm. The details of transition energies and their associated quantized energy levels in both types of wells were studied by PR measurement and the results were compared with numerical simulation results and PL spectra. DFB lasers worked in the wavelength range from 1502.8 to 1535.2 nm. Although channels at longer wavelength failed due to process defect in grating, numerical simulation and laser performance analyses indicated that the modal gain of the channel at 1532.2nm was supported by wide wells.",
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Optical characterization of an asymmetric quantum well structure for broadband laser array application. / Chen, Wei-Li.

In: Japanese Journal of Applied Physics, Vol. 50, No. 4 PART 2, 04DG16, 01.04.2011.

Research output: Contribution to journalArticle

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