Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 35, Issue 1, Pages 35-38Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3221195
Keywords
Edge Coupler; Thin-film Lithium Niobate; Spot size convertor
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Thin-film lithium niobate on insulator (LNOI) has shown promise for high-speed optical communication. An efficient, polarization-insensitive, misalignment-tolerant and broadband fiber-to-chip edge coupler based on trident spot-size convertor (SSC) is presented in this letter.
Thin-film lithium niobate on insulator (LNOI) has recently emerged as a promising platform for high-speed optical communication devices. For practical applications, an efficient, polarization-insensitive, misalignment-tolerant and broadband fiber-to-chip optical coupler is necessary. In this letter, we present a fiber-to-chip edge coupler based on trident spot-size convertor (SSC). Experiment shows 1.18/1.10 dB per facet low loss at 1550 nm for TE/TM polarization respectively. A relatively large alignment tolerance (AT) has also been demonstrated. Over a broadband wavelength range from 1490 nm similar to 1640 nm, the edge coupler exhibits a maximum loss of 1.30 dB, a wavelength dependent loss (WDL) of 0.23 dB for TE mode and a polarization dependent loss (PDL) of 0.33 dB when coupled to a single mode fiber (SMF) with a mode field diameter (MFD) of similar to 6 mu m .
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