A multi-section technique for the electroabsorption measurements in waveguide semiconductor electroabsorption modulators

Jain, M. and Ironside, C.N. (2007) A multi-section technique for the electroabsorption measurements in waveguide semiconductor electroabsorption modulators. IET Optoelectronics, 108(4), pp. 163-168. (doi: 10.1049/iet-opt:20070004)

Abstract

A technique for measuring the optical absorption spectra of waveguides, semiconductors and electroabsorption modulators is described. The technique uses a multi-sectioned optical waveguide that has electrically isolated longitudinal sections and has a p–i–n cross-section structure. Light generated in forward biased sections is used to probe the optical absorption in sections that can be reverse biased. The technique is applied to a p–i–n electroabsorption device that was designed to operate over a broadband of optical communication wavelengths. It has an active region consisting of multiple-width InGaAs–InAlGaAs quantum wells. For this device, a band edge shift of 40 meV is obtained at an applied field of 105 kV cm⁻1, and figures of merit ΔαΔα/<i>F</i> and Δα/ α₀ were also determined as a function of wavelength and applied field, where Δ α is the absorption coefficient change due to electroabsorption, α₀ static absorption coefficient of the wells at zero bias field and <i>F</i> the applied reverse bias field.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ironside, Professor Charles
• Authors: Jain, M., and Ironside, C.N.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering; University Centres > Glasgow Materials Research Initiative
• Journal Name: IET Optoelectronics
• ISSN: 1751-8768