Microwave phase shifter with controllable power response based on slow-and fast-light effects in semiconductor optical amplifiers

Weiqi Xue, Salvador Sales, Jose Capmany, Jesper Mørk

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We suggest and experimentally demonstrate a method for increasing the tunable rf phase shift of semiconductor waveguides while at the same time enabling control of the rf power. This method is based on the use of slow- and fast-light effects in a cascade of semiconductor optical amplifiers combined with the use of spectral filtering to enhance the role of refractive index dynamics. A continuously tunable phase shift of 240° at a microwave frequency of 19 GHz is demonstrated in a cascade of two semiconductor optical amplifiers, while maintaining an rf power change of less than 1.6 dB. The technique is scalable to more amplifiers and should allow realization of an rf phase shift of 360°.
Original languageEnglish
JournalOptics Letters
Volume34
Issue number7
Pages (from-to)929-931
ISSN0146-9592
DOIs
Publication statusPublished - 2009

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