4.5 Article

O-Band Subwavelength Grating Filters in a Monolithic Photonics Technology

期刊

IEEE PHOTONICS TECHNOLOGY LETTERS
卷 32, 期 18, 页码 1207-1210

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2020.3017096

关键词

Bragg gratings; optical filters; nanophotonics; silicon photonics

资金

  1. National Science Foundation [ECCS1809937]

向作者/读者索取更多资源

The data communications industry has begun transitioning from electrical to optical interconnects in datacenters in order to overcome performance bottlenecks and meet consumer needs. To mitigate the costs associated with this change and achieve performance for 5G and beyond, it is crucial to explore advanced photonic devices that can enable high-bandwidth interconnects via wavelength-division multiplexing (WDM) in photonic integrated circuits. Subwavelength grating (SWG) filters have shown great promise for WDM applications. However, the small feature sizes necessary to implement these structures have prohibited them from penetrating into industrial applications. To explore the manufacturability and performance of SWG filters in an industrial setting, we fabricate and characterize the first O-band subwavelength grating filters in a monolithic photonics technology at GLOBALFOUNDRIES (GF). We demonstrate a low drop channel loss of -1.2 dB with a flat-top response, a high extinction ratio of -30 dB, a 3 dB channel width of 5 nm and single-source thermal tunability without shape distortion. This filter structure was designed using elements from the product design kit provided by GF and functions in a compact footprint of 0.002 mm(2) with a minimum feature size of 150 nm.

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