Semipolar InGaN quantum-well laser diode with integrated amplifier for visible light communications

Chao Shen, Tien Khee Ng, Changmin Lee, Shuji Nakamura, James S. Speck, Steven P. DenBaars, Ahmed Y. Alyamani, Munir M. El-Desouki, Boon S. Ooi

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

GaN-based semiconductor optical amplifier (SOA) and its integration with laser diode (LD) is an essential building block yet to be demonstrated for III-nitride photonic integrated circuits (PICs) at visible wavelength. This paper presents the InGaN/GaN quantum well (QW) based dual-section LD consisting of integrated amplifier and laser gain regions fabricated on a semipolar GaN substrate. The threshold current in the laser gain region was favorably reduced from 229mA to 135mA at SOA driving voltages, VSOA, of 0V and 6.25V, respectively. The amplification effect was measured based on a large gain of 5.7 dB at VSOA = 6.25V from the increased optical output power of 8.2 mW to 30.5 mW. Such integrated amplifier can be modulated to achieve Gbps data communication using on-off keying technique. The monolithically integrated amplifier-LD paves the way towards the III-nitride on-chip photonic system, providing a compact, low-cost, and multi-functional solution for applications such as smart lighting and visible light communications.
Original languageEnglish (US)
Pages (from-to)A219
JournalOptics Express
Volume26
Issue number6
DOIs
StatePublished - Feb 14 2018

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