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60 nm Wavelength Range Polarization-Insensitive 1.55 µm Electroabsorption Modulator Using Tensile-Strained Pre-Biased Multiple Quantum Well
Masaki KATO Yoshiaki NAKANO
IEICE TRANSACTIONS on Electronics
Publication Date: 2000/06/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Optical Devices for Next Generation High-Speed Communication Systems and Photonic Networks)
Category: Switches and Novel Devices
multiple-quantum-well electroabsorption modulator, polarization-insensitive operation, tensile-strained quantum well, potential-tailored quantum well, molecular beam epitaxy,
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We studied theoretically and experimentally an InGaAs/InAlAs/InP polarization-insensitive multiple quantum well (MQW) electroabsorption (EA) modulator operating over a very wide wavelength range in 1.55 µm wavelength region. One of the simplest possible potential-tailored quantum well, "pre-biased" quantum well (PBQW) is used to achieve wide-wavelength polarization insensitivity. PBQW is basically a rectangular quantum well with a thin barrier inserted near one edge of well. This thin barrier effectively introduces "pre-bias" to a rectangular quantum well and the same amount of Stark shift is achieved for electron-heavy hole and electron-light hole transition energies. By incorporating tensile strain into PBQW, polarization-insensitive modulation is achieved over 60 nm wavelength range, from 1510 nm to 1570 nm. This MQW-EA modulator plays an important role in wavelength division multiplexing (WDM) transmission and switching systems.