Efficient InGaAsP/InP multiple quantum well waveguide optical phase modulator

H. K. Tsang, J. B.D. Soole, H. P. LeBlanc, R. Bhat, M. A. Koza, I. H. White

Research output: Contribution to journalArticlepeer-review


We report an InGaAsP/InP multiple quantum well optical phase modulator which has a high phase modulation efficiency and low loss modulation over the entire 1.5-1.56 μm fiber band. For a 4-mm-long device, π phase modulation requires a modulation voltage of only 0.6 V at 1.49 μm and 1.1 V at 1.55 μm wavelength. The absorption modulation for a 0-5 V bias change is negligible at 1.55 μm, rising to 0.7 cm-1 at 1.49 μm. The spectral dependence of the electrorefraction from the quantum-confined Stark effect has also been measured for the first time over a wide continuous wavelength range. Far from the absorption edge the electrorefraction decreases approximately as the square of the energy detuning.

Original languageEnglish
Pages (from-to)2285-2287
Number of pages3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 1 Dec 1990

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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