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8 December 2018 Ultrabroadband lattice filters for integrated photonic spectroscopy and sensing
Nathan F. Tyndall, Todd H. Stievater, Dmitry A. Kozak, Marcel W. Pruessner, Scott A. Holmstrom, William S. Rabinovich
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Optical Engineering, Vol. 57, Issue 12, 127103 (December 2018). https://doi.org/10.1117/1.OE.57.12.127103
Abstract
We report the design, fabrication, and measurement of waveguide lattice filters for use in integrated Raman- or fluorescence-based spectroscopy and sensing systems. The filters consist of a series of broadband directional couplers and optical delay sections that create an n-stage unbalanced Mach–Zehnder interferometer specifically designed to segregate pump light and redshifted signal light in the two output ports. We first report the design criteria for optimal filter performance. Then, we use these criteria with numerical beam propagation methods to design specific broadband couplers. The filters were fabricated by a photonic integrated circuit foundry and measured using white-light spectroscopy. We report both four-stage and eight-stage filters, with the eight-stage filter demonstrating a 190-nm-wide signal passband (1100  cm  −  1) on the “through” port with <1.5  dB of ripple and a 17-nm-wide, 20-dB extinction band at the filter resonance.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Nathan F. Tyndall, Todd H. Stievater, Dmitry A. Kozak, Marcel W. Pruessner, Scott A. Holmstrom, and William S. Rabinovich "Ultrabroadband lattice filters for integrated photonic spectroscopy and sensing," Optical Engineering 57(12), 127103 (8 December 2018). https://doi.org/10.1117/1.OE.57.12.127103
Received: 15 August 2018; Accepted: 9 November 2018; Published: 8 December 2018
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Cited by 9 scholarly publications.
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KEYWORDS
Waveguides
Optical filters
Spectroscopy
Electronic filtering
Photonic integrated circuits
Raman spectroscopy
Integrated photonics
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