Eight-Channel DFB Laser Array Based on Four Phase-Shifted Sampled Bragg Gratings

Sun, Y., Yuan, B., Sun, X., Marsh, J. H. and Hou, L. (2023) Eight-Channel DFB Laser Array Based on Four Phase-Shifted Sampled Bragg Gratings. 46th European Semiconductor Laser Workshop (ESLW 2023), Glasgow, UK, 30 Sept 2023.

Abstract

Distributed feedback (DFB) semiconductor laser arrays are of substantial interest in dense wavelength division multiplexing (DWDM) networks for higher data capacity, especially for low-cost applications in data centres and access networks. It is highly desirable to precisely control the DWDM source channel spacing with simple technology. Here an eight-channel DFB laser array with integrated semiconductor optical amplifiers (SOAs) is demonstrated using four phaseshifted sampled Bragg gratings(4PS-SBGs). Compared with conventional sampled Bragg gratings(C-SBGs) and 2PS-SBGs, whose corresponding effective grating coupling coefficients (κ) are only 0.32 times and 0.64 times that of the continuous uniform gratings respectively, 4PS-SBGs configuration enhances the effective κ of approximately 0.9 times that of a uniform grating. The DFB laser cavity is only 600 µm long, while the channel spacing is precisely maintained at 0.8 ± 0.016 nm around the operational wavelength of 1565 nm. The single longitudinal mode (SLM) operation is maintained across a wide range of drive currents for both the DFB and SOA, with side-mode suppression ratios (SMSRs) surpassing 35 dB and output power of about 33 mW. Furthermore, the sidewall grating design needs only one MOVPE step and one dry etch of the III-V material, simplifying the whole device fabrication process, which is a highly desirable feature for DWDM sources in price-sensitive applications such as passive optical networks (PONs).

• Item Type: Conference or Workshop Item
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sun, Yiming and Yuan, Bocheng and Hou, Dr Lianping and Marsh, Professor John and Sun, Xiao
• Authors: Sun, Y., Yuan, B., Sun, X., Marsh, J. H., and Hou, L.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering

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