CMOS-Compatible Vertical Grating Coupler With Quasi Mach–Zehnder Characteristics

Author

Zanyun Zhang ; Zan Zhang ; Beiju Huang ; Chuantong Cheng ; Hongda Chen

Author_Institution

State Key Lab. of Integrated Optoelectron., Inst. of Semicond., Beijing, China

Volume

25

Issue

3

fYear

2013

fDate

Feb.1, 2013

Firstpage

224

Lastpage

227

Abstract

A vertical grating coupler on silicon-on-insulator substrates has been designed and demonstrated. The light from a vertical fiber can be coupled in and split equally into two arms with the fiber placed in the grating center. An optical combiner is used to collect the transmission from the two arms. The measured peak coupling efficiency is 37%. Our device can also function like a Mach-Zehnder interferometer. In a device with an arm difference of 30 μm, the normalized transmission spectra of 20-nm free spectral range and more than 12-dB extinction ratio at 1567 nm are obtained.

Keywords

Mach-Zehnder interferometers; diffraction gratings; optical couplers; optical design techniques; silicon-on-insulator; CMOS; Mach-Zehnder interferometer; Si; efficiency 37 percent; extinction ratio; free spectral range; normalized transmission spectra; optical combiner; peak coupling efficiency; quasi Mach-Zehnder characteristics; silicon-on-insulator substrates; vertical grating coupler; wavelength 1567 nm; Couplers; Couplings; Fiber gratings; Gratings; Optical fiber couplers; Optical fiber devices; Gratings; interference; silicon-on-insulator (SOI) technology; waveguide couplers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2234099

Filename

6381453