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Article

Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers

1
Centre for Advanced Photonics and Process Analysis, Munster Technological University, T12 P928 Cork, Ireland
2
Tyndall National Institute, T12 R5CP Cork, Ireland
3
Physics Department, University College Cork, T12 K8AF Cork, Ireland
4
INTEC, imec—UGent, 9000 Ghent, Belgium
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Mingchu Tang, Taojie Zhou and Chao-Yuan Jin
Crystals 2021, 11(8), 848; https://doi.org/10.3390/cryst11080848
Received: 11 June 2021 / Revised: 15 July 2021 / Accepted: 19 July 2021 / Published: 22 July 2021
(This article belongs to the Special Issue Photonic Crystal Lasers)
We present a design methodology for hybrid lasers to realise mode-hop free operation by controlling the cavity mode spacing. In this study, a compact hybrid photonic crystal laser (H-PhCL) was employed which allowed a reduction of the Fabry–Perot length of the laser cavity and eliminated the need for an active mode stabilisation mechanism in order to realise mode-hop free operation. The H-PhCL was formed by butt-coupling a reflective semiconductor optical amplifier (RSOA) with a two-dimensional silicon (Si) photonic crystal (PhC) cavity. Continuous stable single frequency operation with >40 dB side-mode suppression ratio (SMSR) of the laser was achieved for gain currents of up to 100 mA, i.e., up to four times the threshold current. The shorter length of the laser cavity enabled single frequency operation due to the selection of a single longitudinal mode by the PhC narrowband reflector. Various longitudinal mode spacing regimes were studied to explain the mode-hop free characteristics of the H-PhCL. The proposed hybrid laser design methodologies can be adapted to eliminate mode-hopping in laser wavelength. View Full-Text
Keywords: III–V/Si hybrid lasers; photonic crystal lasers; laser cavity design III–V/Si hybrid lasers; photonic crystal lasers; laser cavity design
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MDPI and ACS Style

Singaravelu, P.K.J.; Butler, S.M.; Sheehan, R.N.; Liles, A.A.; Hegarty, S.P.; O’Faolain, L. Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers. Crystals 2021, 11, 848. https://doi.org/10.3390/cryst11080848

AMA Style

Singaravelu PKJ, Butler SM, Sheehan RN, Liles AA, Hegarty SP, O’Faolain L. Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers. Crystals. 2021; 11(8):848. https://doi.org/10.3390/cryst11080848

Chicago/Turabian Style

Singaravelu, Praveen K. J., Sharon M. Butler, Robert N. Sheehan, Alexandros A. Liles, Stephen P. Hegarty, and Liam O’Faolain. 2021. "Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers" Crystals 11, no. 8: 848. https://doi.org/10.3390/cryst11080848

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