Abstract
We report the fabrication of a reconfigurable wide-band twenty-channel second-order dual filterbank, defined on a silicon-on-insulator (SOI) platform, with tunable channel spacing and 20 GHz single-channel bandwidth. We demonstrate the precise tuning of eleven (out of the twenty) channels, with a channel spacing of 124 GHz (~1 nm) and crosstalk between channels of about -45 dB. The effective thermo-optic tuning efficiency is about 27 μW/GHz/ring. A single channel of a twenty-channel counter-propagating filterbank is also demonstrated, showing that both propagating modes exhibit identical filter responses. Considerations about thermal crosstalk are also presented. These filterbanks are suitable for on-chip wavelength-division-multiplexing applications, and have the largest-to-date reported number of channels built on an SOI platform.
Highlights
Multi-channel high-order microring resonators are essential components for low-cost highly integrated wavelength-division-multiplexing (WDM) systems and photonic integrated circuits [1,2]
Light from a tunable infrared laser is coupled into the filterbanks through a high-numerical-aperture lensed fiber, and the light exiting the through and drop ports is collected with a similar lensed fiber and coupled into an optical spectrum analyzer (OSA)
The input TE polarization is controlled with a polarization controller (PC), and an optional output PC can be used if extra polarization control is needed
Summary
Multi-channel high-order microring resonators are essential components for low-cost highly integrated wavelength-division-multiplexing (WDM) systems and photonic integrated circuits [1,2]. We study such a twenty-channel second-order dual filterbank (in silicon) with reconfigurable channel spacing, and demonstrate precise tuning of eleven consecutive channels [14]. The fabricated filterbank is intended as a multiplexer for a wavelength-demultiplexed photonic analog-to-digital converter [15,16] In this application, it is desirable to use both outputs of the Mach-Zehnder modulator in order to linearize its transfer function [17]. It is desirable to use both outputs of the Mach-Zehnder modulator in order to linearize its transfer function [17] Both halves of the dual filterbank need to have the same filter response, which presents additional fabrication challenges. A careful study of thermal crosstalk between the two rings forming a single channel is presented in this paper
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