Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers
We demonstrate adiabatically tapered fibers terminating in sub-micron tips that are clad with a higher-index material for coupling to an on-chip waveguide. This cladding enables coupling to a high-index waveguide without losing light to the buried oxide. A technique to clad the tip of the tapered fi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2020-05-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/1.5145105 |
| _version_ | 1818148842770530304 |
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| author | Saeed Khan Sonia M. Buckley Jeff Chiles Richard P. Mirin Sae Woo Nam Jeffrey M. Shainline |
| author_facet | Saeed Khan Sonia M. Buckley Jeff Chiles Richard P. Mirin Sae Woo Nam Jeffrey M. Shainline |
| author_sort | Saeed Khan |
| collection | DOAJ |
| description | We demonstrate adiabatically tapered fibers terminating in sub-micron tips that are clad with a higher-index material for coupling to an on-chip waveguide. This cladding enables coupling to a high-index waveguide without losing light to the buried oxide. A technique to clad the tip of the tapered fiber with a higher-index polymer is introduced. Conventional tapered waveguides and forked tapered waveguide structures are investigated for coupling from the clad fiber to the on-chip waveguide. We find the forked waveguide facilitates alignment and packaging, while the conventional taper leads to higher bandwidth. The insertion loss from a fiber through a forked coupler to a sub-micron silicon nitride waveguide is 1.1 dB and the 3 dB bandwidth is 90 nm. The coupling loss in the packaged device is 1.3 dB. With a fiber coupled to a conventional tapered waveguide, the loss is 1.4 dB with a 3 dB bandwidth extending beyond the range of the measurement apparatus, estimated to exceed 250 nm. |
| first_indexed | 2024-12-11T12:57:34Z |
| format | Article |
| id | doaj.art-d353fdbc38ca49c98eaba2fa2eea0dcd |
| institution | Directory Open Access Journal |
| issn | 2378-0967 |
| language | English |
| last_indexed | 2024-12-11T12:57:34Z |
| publishDate | 2020-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj.art-d353fdbc38ca49c98eaba2fa2eea0dcd2022-12-22T01:06:32ZengAIP Publishing LLCAPL Photonics2378-09672020-05-0155056101056101-810.1063/1.5145105Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibersSaeed Khan0Sonia M. Buckley1Jeff Chiles2Richard P. Mirin3Sae Woo Nam4Jeffrey M. Shainline5National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USANational Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USANational Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USANational Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USANational Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USANational Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USAWe demonstrate adiabatically tapered fibers terminating in sub-micron tips that are clad with a higher-index material for coupling to an on-chip waveguide. This cladding enables coupling to a high-index waveguide without losing light to the buried oxide. A technique to clad the tip of the tapered fiber with a higher-index polymer is introduced. Conventional tapered waveguides and forked tapered waveguide structures are investigated for coupling from the clad fiber to the on-chip waveguide. We find the forked waveguide facilitates alignment and packaging, while the conventional taper leads to higher bandwidth. The insertion loss from a fiber through a forked coupler to a sub-micron silicon nitride waveguide is 1.1 dB and the 3 dB bandwidth is 90 nm. The coupling loss in the packaged device is 1.3 dB. With a fiber coupled to a conventional tapered waveguide, the loss is 1.4 dB with a 3 dB bandwidth extending beyond the range of the measurement apparatus, estimated to exceed 250 nm.http://dx.doi.org/10.1063/1.5145105 |
| spellingShingle | Saeed Khan Sonia M. Buckley Jeff Chiles Richard P. Mirin Sae Woo Nam Jeffrey M. Shainline Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers APL Photonics |
| title | Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers |
| title_full | Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers |
| title_fullStr | Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers |
| title_full_unstemmed | Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers |
| title_short | Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers |
| title_sort | low loss high bandwidth fiber to chip coupling using capped adiabatic tapered fibers |
| url | http://dx.doi.org/10.1063/1.5145105 |
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