Compact Low-Loss Optical 72<inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> Hybrid Based on Nonoverlapping-Image Multimode Interference Coupler in Silicon-on-Insulator
A universal principle to achieve different optical hybrids is summarized based on general nonoverlapping-image MMI couplers. An optical 72<inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> hybrid is proposed and demonstrated which is...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8915737/ |
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| Summary: | A universal principle to achieve different optical hybrids is summarized based on general nonoverlapping-image MMI couplers. An optical 72<inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> hybrid is proposed and demonstrated which is achieved by a 2 × 5 multimode interference (MMI) coupler with length of 89.5 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m and width of 8.0 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m. The device is fabricated in silicon-on-insulator (SOI) with 220 nm thick top silicon layer and the buried oxide layer is 3 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m thick. The proposed device exhibits an extinction ratio larger than 20 dB from 1470.8 nm to 1581.2 nm. The excess loss of optical hybrid is about 1.4 dB and a phase deviation less than <inline-formula><tex-math notation="LaTeX">$\pm 6.0^{\circ }$</tex-math></inline-formula> is obtained with the bandwidth of 51.5 nm. |
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| ISSN: | 1943-0655 |