A new integrated optical high-resolution spectrum analyzer structure based on ring resonator applicable to DWDM networks

Abstract

In this paper, we demonstrate a compact and integrated optical spectrum analyzer (OSA) based on ring resonator. In this proposal thermo-optic, electro-optic, acousto-optic and nonlinear optic can be used as control signal to sweep and scan the frequencies of the input signal. The applied control signal changes the index of refraction of ring resonator and therefore the resonance frequency is changed and the output intensity in the reflected port is changed proportional to the input signal contents. Also, the proposed idea can easily be integrated on optical chip. The presented design idea is simple for realization using optical integrated circuits, has high accuracy (less than 4 pm) and compact. This new OSA is suitable for the wavelength-division-multiplexing performance monitoring that requires high speed and high wavelength measurement as well as other related applications.