All-silicon interferometer with multimode waveguides for temperature-insensitive filters and compact biosensors

Xiaowei Guan*, Lars Hagedorn Frandsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We report a novel design of an all-silicon temperature-independent filter employing a Mach-Zehnder interferometer (MZI) with multimode waveguides. The two arms of the MZI have equal lengths and equal widths but propagate different modes having different effective indices to guarantee an optical path difference (OPD) but similar temperature-dependence to diminish any thermal shifts of the interference pattern. A temperature-independent MZI filter with only one channel is also proposed and experimentally demonstrated. Measurements verify the principle of operation and a low temperature sensitivity of −20 to 10 pm/°C in the C-band for both MZI filters is achieved. The one-channel MZI structure is furthermore employed to achieve a compact sensor exhibiting a high sensitivity of 826 nm/RIU (refractive index unit).
Original languageEnglish
JournalOptics Express
Volume27
Issue number2
Pages (from-to)753-760
Number of pages1
ISSN1094-4087
DOIs
Publication statusPublished - 2019

Cite this

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title = "All-silicon interferometer with multimode waveguides for temperature-insensitive filters and compact biosensors",
abstract = "We report a novel design of an all-silicon temperature-independent filter employing a Mach-Zehnder interferometer (MZI) with multimode waveguides. The two arms of the MZI have equal lengths and equal widths but propagate different modes having different effective indices to guarantee an optical path difference (OPD) but similar temperature-dependence to diminish any thermal shifts of the interference pattern. A temperature-independent MZI filter with only one channel is also proposed and experimentally demonstrated. Measurements verify the principle of operation and a low temperature sensitivity of −20 to 10 pm/°C in the C-band for both MZI filters is achieved. The one-channel MZI structure is furthermore employed to achieve a compact sensor exhibiting a high sensitivity of 826 nm/RIU (refractive index unit).",
author = "Xiaowei Guan and Frandsen, {Lars Hagedorn}",
year = "2019",
doi = "10.1364/OE.27.000753",
language = "English",
volume = "27",
pages = "753--760",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
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All-silicon interferometer with multimode waveguides for temperature-insensitive filters and compact biosensors. / Guan, Xiaowei; Frandsen, Lars Hagedorn.

In: Optics Express, Vol. 27, No. 2, 2019, p. 753-760.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - All-silicon interferometer with multimode waveguides for temperature-insensitive filters and compact biosensors

AU - Guan, Xiaowei

AU - Frandsen, Lars Hagedorn

PY - 2019

Y1 - 2019

N2 - We report a novel design of an all-silicon temperature-independent filter employing a Mach-Zehnder interferometer (MZI) with multimode waveguides. The two arms of the MZI have equal lengths and equal widths but propagate different modes having different effective indices to guarantee an optical path difference (OPD) but similar temperature-dependence to diminish any thermal shifts of the interference pattern. A temperature-independent MZI filter with only one channel is also proposed and experimentally demonstrated. Measurements verify the principle of operation and a low temperature sensitivity of −20 to 10 pm/°C in the C-band for both MZI filters is achieved. The one-channel MZI structure is furthermore employed to achieve a compact sensor exhibiting a high sensitivity of 826 nm/RIU (refractive index unit).

AB - We report a novel design of an all-silicon temperature-independent filter employing a Mach-Zehnder interferometer (MZI) with multimode waveguides. The two arms of the MZI have equal lengths and equal widths but propagate different modes having different effective indices to guarantee an optical path difference (OPD) but similar temperature-dependence to diminish any thermal shifts of the interference pattern. A temperature-independent MZI filter with only one channel is also proposed and experimentally demonstrated. Measurements verify the principle of operation and a low temperature sensitivity of −20 to 10 pm/°C in the C-band for both MZI filters is achieved. The one-channel MZI structure is furthermore employed to achieve a compact sensor exhibiting a high sensitivity of 826 nm/RIU (refractive index unit).

U2 - 10.1364/OE.27.000753

DO - 10.1364/OE.27.000753

M3 - Journal article

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JO - Optics Express

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SN - 1094-4087

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