Journal
OPTICS LETTERS
Volume 47, Issue 3, Pages 714-717Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.445526
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Funding
- National NanoFab Center [COI1914M101]
- Ministry of Science and ICT, South Korea [CAP-17-03-KISTI-03]
- Korea Semiconductor Research Consortium
- Ministry of Trade, Industry and Energy [10085592]
- National Research Foundation of Korea [2020M3F6A108270312]
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-17-03-KISTI] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An inter-chip optical link using direct optical wire bonding by open-to-air polymerization was developed. The DOW bonding showed low insertion loss and a larger wavelength tolerance compared to conventional connections. This study demonstrates the feasibility of out-of-plane connection with edge-coupling devices.
We developed an inter-chip optical link using direct optical wire (DOW) bonding by open-to-air polymerization. An arch-shaped wire was drawn from a tip in a similar way to a metal wire, but the wire was formed from a polymer solution that solidified in the air during wiring. The DOW bonding was examined for silicon photonic chips where grating couplers are integrated for input/output coupling. Cone-shaped studs were formed at the ends of the wire, and their geometry was optimized using finite-difference time-domain simulation to give a mode conversion function. Although the polymer wire had a multimode scale of 7 mu m, the wire bonding between the grating couplers showed a relatively low insertion loss of 5.8 dB at a wavelength of 1590 nm compared to a conventional connection using single-mode fiber blocks. It also showed a larger wavelength tolerance within the range of similar to 1520-1590nm. DOW bonding between a grating coupler and a single-mode fiber were also examined to verify the feasibility of out-of-plane connection with edge-coupling devices. The grating-to-fiber wire link also exhibited a large wavelength tolerance. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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