| Authors: | A. Ruocco, D. Van Thourhout, W. Bogaerts | | Title: | Silicon Photonic Spectrometer for Accurate Peak Detection using the Vernier Effect and Time-Domain Multiplexing | | Format: | International Journal | | Publication date: | 10/2014 | | Journal/Conference/Book: | Journal of Lightwave Technology
| | Editor/Publisher: | IEEE, | | Volume(Issue): | p.3351 - 3357 | | DOI: | 10.1109/JLT.2014.2346585 | | Citations: | 10 (Dimensions.ai - last update: 14/4/2024)
6 (OpenCitations - last update: 19/4/2024)
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Abstract
We present a silicon-on-insulator (SOI) spectrometer for wavelength peak detection operating in a 20nm wavelength band around 1550 nm with an average accuracy of 12 pm. The silicon photonic integrated circuit (PIC) occupies a footprint of 250 700 um2 and is composed of a passive arrayed waveguide grating (AWG) and an array of thermo-optic Mach-Zehnder interferometer (MZI) switches. The AWG multiplexes multiple inputs and outputs with a vernier design that shifts the spectral response of the different inputs. In this demonstration, we use five output channels and four input channels, with a 4.0 nm channel spacing and 5.0 nm channel spacing, respectively. The responses to the different inputs are disentangled at the outputs by time-multiplexing the inputs with the switches.We demonstrate a more than tenfold improvement in peak detection accuracy using the Vernier effect, from nm range using a single input to picometers range using the 4 inputs. Related Research Topics
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