High-Speed Nonpolar InGaN/GaN Superluminescent Diode With 2.5 GHz Modulation Bandwidth

Journal Article · Mon Feb 24 00:00:00 EST 2020 · IEEE Photonics Technology Letters

DOI:https://doi.org/10.1109/LPT.2020.2976060· OSTI ID:1618438

Rashidi, Arman ^[1]; Rishinaramangalam, Ashwin K. ^[2]; Aragon, Andrew A. ^[2]; Mishkat-Ul-Masabih, Saadat ^[2]; Monavarian, Morteza ^[2]; Lee, Changmin ^[3]; Denbaars, Steven P. ^[3]; Feezell, Daniel F. ^[2]

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1. Univ. of New Mexico, Albuquerque, NM (United States); University of New Mexico
2. Univ. of New Mexico, Albuquerque, NM (United States)
3. Univ. of California, Santa Barbara, CA (United States)

We demonstrate a superluminescent diode fabricated on a nonpolar m-plane GaN substrate by employing a linearly tapered waveguide design. A high electrical -3dB modulation bandwidth ( f\n_3dB\n) of 2.5 GHz at a current density of 30 kA/cm\n²\n is achieved. The high modulation bandwidth is attributed to the shorter carrier recombination lifetime, the linear gain curve in the nonpolar m-plane quantum wells, and the ability to operate at high current densities while effectively suppressing lasing. We derive a general expression for the -3dB bandwidth as a function of current density for SLDs using a similar approach to that for laser diodes. The -3dB bandwidth of a nonpolar superluminescent diode increases exponentially with current density. The experimental results are consistent with the derived expression for f\n_3dB\n vs. current density.

• Research Organization: Univ. of New Mexico, Albuquerque, NM (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: SC0016618
• OSTI ID: 1618438
• Report Number(s): DOE-UNM--16618-2
• Journal Information: IEEE Photonics Technology Letters, Journal Name: IEEE Photonics Technology Letters Journal Issue: 7 Vol. 32; ISSN 1041-1135
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
42 ENGINEERING
bandwidth
gallium nitride
modulation
solid-state lighting
suoperluminescent diode