Distributed feedback lasers using surface gratings in Bragg waveguides

Bilal Janjua, Meng Lon Iu, Zhizhong Yan, Paul Charles, Eric Chen, Amr S. Helmy

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This Letter presents, to the best of our knowledge, the first report of a narrow-linewidth ∼790−800 nm edge-emitting semiconductor distributed feedback Bragg reflection waveguide diode laser (DFB2RL). The DFB2RLs were fabricated using a ridge waveguide structure with 5th order, surface-etched grating forming the wavelength selective element. Unbonded devices with a 500 µm cavity length exhibited continuous wave threshold currents in the region of 25 mA with an output power of 2.5 mW per (uncoated) facet at 100 mA drive current. The devices operated in a single longitudinal mode, with side-mode suppression ratio (SMSR) as high as 49 dB and linewidths as low as 207 kHz. Devices maintained single mode operation with high SMSR over a 9 nm wavelength range as the temperature was swept from 15◦C to 50◦C.
Original languageEnglish (US)
Pages (from-to)3689-3692
Number of pages4
JournalOptics Letters
Issue number15
StatePublished - Jul 27 2021
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2021-08-19
Acknowledged KAUST grant number(s): 501100004052, OSR-2017-CRG6-3417-02
Acknowledgements: Funding. King Abdullah University of Science and Technology (501100004052, OSR-2017-CRG6-3417-02).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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