A temporal coherence study of quantum-dot/dash broadband lasers and superluminescent diodes

Clara E. Dimas*, Chee Loon Tan, Hery Susano Djie, Alastair D. McAulay, Boon Siew Ooi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The temporal coherence functions of InGaAs-GaAs quantum-dot (QD) and InAs-InGaAlAs quantum-dash (Qdash) superluminescent diodes (SLDs) and broadband laser diodes (BLDs) are reported. Using an optical fiber-based spectral interferometer, the fabricated devices were shown to yield low coherence lengths of 4.00-12.29 μm and 33.48-74.56 μm for SLD and BLD devices, respectively. In addition, there were negligible secondary coherencies indicating that these devices have the potential for use in low coherent interferometric systems.

Original languageEnglish (US)
Pages (from-to)694-696
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number11
StatePublished - Jun 1 2009
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received November 21, 2008; revised February 13, 2009. First published March 16, 2009; current version published May 08, 2009. This work was supported in part by the National Science Foundation (NSF) under Grant 0725647, in part by the U.S. Army Research Laboratory, in part by the Commonwealth of Pennsylvania, and in part by the Department of Community and Economic Development.


  • Quantum-dash (Qdash)
  • Quantum-dot (QD)
  • Semiconductor laser
  • Superluminescent diode (SLD)
  • Temporal coherence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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