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Photonics 2015, 2(4), 1065-1080; doi:10.3390/photonics2041065

A Thermally Tunable 1 × 4 Channel Wavelength Demultiplexer Designed on a Low-Loss Si3N4 Waveguide Platform

1
Department of Electrical and Computer Engineering, McGill University, Montréal, QC H3A 0E9, Canada
2
LioniX BV, PO Box 456, 7500 AL Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 4 October 2015 / Revised: 31 October 2015 / Accepted: 3 November 2015 / Published: 6 November 2015
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Abstract

A thermally tunable 1 × 4 channel optical demultiplexer was designed using an ultra low-loss Si3N4 (propagation loss ~3.1 dB/m) waveguide. The demultiplexer has three 2 × 2 Mach-Zehnder interferometers (MZI), where each of the MZI contains two 2 × 2 general interference based multimode interference (MMI) couplers. The MMI couplers exhibit −3.3 dB to −3.7 dB power division ratios over a 50 nm wavelength range from 1530 nm to 1580 nm. The chrome-based (Cr) heaters placed on the delay arms of the MZI filters enable thermal tuning to control the optical phase shift in the MZI delay arms. This facilitates achieving moderately low crosstalk (14.5 dB) between the adjacent channels. The optical insertion loss of the demultiplexer per channel is between 1.5 dB to 2.2 dB over the 1550 nm to 1565 nm wavelength range. Error free performance (BER of 10−12) is obtained for all four 40 Gb/s data rate channels. The optical demultiplexer is an important tool towards building photonic integrated circuits with complex optical signal processing functionalities in the low-loss Si3N4 waveguide platform. View Full-Text
Keywords: photonic integrated circuits; silica and silicon nitride photonics; wavelength filtering devices photonic integrated circuits; silica and silicon nitride photonics; wavelength filtering devices
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hai, M.S.; Leinse, A.; Veenstra, T.; Liboiron-Ladouceur, O. A Thermally Tunable 1 × 4 Channel Wavelength Demultiplexer Designed on a Low-Loss Si3N4 Waveguide Platform. Photonics 2015, 2, 1065-1080.

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