Miniaturized integrated spectrometer using a silicon ring-grating design

Alshamrani, Naif; Grieco, Andrew; Hong, Brandon; Fainman, Yeshaiahu

doi:10.1364/OE.424443

Miniaturized integrated spectrometer using a silicon ring-grating design

Journal Article · Mon May 03 00:00:00 EDT 2021 · Optics Express

DOI:https://doi.org/10.1364/OE.424443· OSTI ID:1781255

Alshamrani, Naif; Grieco, Andrew; Hong, Brandon; Fainman, Yeshaiahu

We introduce and experimentally demonstrate a miniaturized integrated spectrometer operating over a broad bandwidth in the short-wavelength infrared (SWIR) spectrum that combines an add-drop ring resonator narrow band filter with a distributed Bragg reflector (DBR) based broadband filter realized in a silicon photonic platform. The contra-directional coupling DBR filter in this design consists of a pair of waveguide sidewall gratings that act as a broadband filter (i.e., 3.9 nm). The re-directed beam is then fed into the ring resonator which functions as a narrowband filter (i.e., 0.121 nm). In this scheme the free spectral range (FSR) limitation of the ring resonator is overcome by using the DBR as a filter to isolate a single ring resonance line. The overall design of the spectrometer is further simplified by simultaneously tuning both components through the thermo-optic effect. Moreover, several ring-grating spectrometer cells with different central wavelengths can be stacked in cascade in order to cover a broader spectrum bandwidth. This can be done by centering each unit cell on a different center wavelength such that the maximum range of one-unit cell corresponds to the minimum range of the next unit cell. This configuration enables high spectral resolution over a large spectral bandwidth and high extinction ratio (ER), making it suitable for a wide variety of applications.

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Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: NONE; SC0019273

OSTI ID:: 1781255

Alternate ID(s):: OSTI ID: 1852989

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 10 Vol. 29; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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