High extinction ratio and broad band DQPSK demodulation on silicon-on-insulator platform

Author

Hsu, Shih-Hsiang

Author_Institution

Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan

fYear

2011

fDate

18-21 Oct. 2011

Firstpage

343

Lastpage

345

Abstract

The extinction ratio of a Mach-Zehnder interferometer, a cascade of two directional couplers, is a critical parameter for the bit error rate performance of differential quadrature phase shift keying (DQPSK) demodulation. The coupling length of a directional coupler is also strongly dependent on polarization and wavelength. A Mach-Zehnder directional coupler including the bending effects was then proposed on a 5-μm thick silicon-on-insulator waveguide. A 30-dB extinction ratio and 0.5-dB polarization dependent loss over C+L bands of the lightwave communication wavelengths were demonstrated for DQPSK demodulation applications.

Keywords

Mach-Zehnder interferometers; demodulation; differential phase shift keying; directional couplers; error statistics; quadrature phase shift keying; silicon-on-insulator; C+L bands; Mach-Zehnder interferometer; bending effects; bit error rate; broadband DQPSK demodulation; differential quadrature phase shift keying; directional couplers; lightwave communication wavelengths; silicon-on-insulator waveguide; size 5 mum; Delay; Demodulation; Erbium; Fiber optics; Optical interferometry; Optical polarization; Optical waveguides; DQPSK; Directional Coupler; Extinction Ratio; Mach-Zehnder Interferometer; Polarization Dependent Loss; Silicon-on-insulator Waveguide;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Photonics, 2011 International Topical Meeting on & Microwave Photonics Conference, 2011 Asia-Pacific, MWP/APMP

Conference_Location

Singapore

Print_ISBN

978-1-61284-716-0

Type

conf

DOI

10.1109/MWP.2011.6088741

Filename

6088741