Miniaturized integrated spectrometer using a silicon ring-grating design
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.
- Research Organization:
- Univ. of California, San Diego, La Jolla, CA (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency; US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); Army Research Office (ARO); Cymer Corporation; Keysight Technologies.
- Grant/Contract Number:
- SC0019273; CBET-1704085; DMR-1707641; ECCS-180789; ECCS-190184; ECCS-2023730; ECCS-205752
- OSTI ID:
- 1781255
- Alternate ID(s):
- OSTI ID: 1852989
- Journal Information:
- Optics Express, Journal Name: Optics Express Vol. 29 Journal Issue: 10; ISSN 1094-4087
- Publisher:
- Optical Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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