Integrated Optical Modulator Based on Transition between Photonic Bands

Gövdeli A. , Sarihan M. C. , Karaca U., Kocaman S.

SCIENTIFIC REPORTS, cilt.8, 2018 (SCI İndekslerine Giren Dergi) identifier identifier identifier


An area efficient novel optical modulator with low operation voltage is designed based on integrated Mach-Zehnder Interferometer with a photonic crystal slab structure as the phase shifter. Plasma dispersion effect is utilized so that photonic band-to-band transition occurs at the operating frequency leading to a high index change (Delta n = similar to 4) for pi-phase shift on the modulator. This approach reduces the phase shifter length to a few micrometers (similar to 5 mu m) in a silicon on insulator platform and operating voltage required is around 1 V. Low voltage together with short optical interaction length decrease optical losses and power consumption during modulation process providing a great opportunity for size and system cost optimization.