High-performance InP-based Mach-Zehnder polarization beam splitter with a 19 dB extinction ratio across C-band.

Abstract

A high-performance InP-based polarization beam splitter (PBS) using a symmetrical Mach-Zehnder interferometer is experimentally demonstrated. The waveguides are aligned along the [011] direction, which results in a small reverse bias required and easy adjustment to realize the PBS. The experimental results indicate that the polarization extinction ratio (PER) is over 19dB in the wavelength range from 1525 to 1570nm with one arm injected with a 4.32mA current and the other arm reversed biased at 5.14V simultaneously. The PER is measured to remain above 18dB in the same wavelength range even when the width varies by ±200 nm.